GENERAL SPECIFICATION
PROCESS
GS EP ECP 101
Glycol package unit
03 11/05 Updated to include “EP” in GS nomenclature
02 10/03 Update and change of Group name and logo
01 09/02 Replaces GS EXP 301
00 06/01 First issue
Contents
1. Scope ...4
2. Reference documents...4
3. General...5
3.1 Definition of terms...5 3.2 Conflictive requirements ...5 3.3 Referenced documents...53.4 Site environmental conditions...5
3.5 Utilities ...6
3.6 Area classification...6
4. Scope of supply ...6
4.1 Extent of supply ...6
4.2 Supply limits...8
5. Process design minimum requirements ...8
5.1 Main parameters...8
5.2 Glycol dehydration column ...10
5.3 Glycol regeneration skid ...13
6. Safety ...25
6.1 Glycol skid ...25
6.2 Gas and fire detection...25
6.3 Fire-fighting...25
7. Layout and general requirements...26
8. Minimum information to be supplied by Vendor ... 26
8.1 Tender documents...26
8.2 Documents for approval during detailed engineering ...27
8.3 Final documentation ...28
9. Process guarantee ...28
9.1 Water content ...28
9.2 Turn down ratio...28
9.4 Pressure drop/Temperature increase in the contactor ...28
9.5 Glycol losses...28
9.6 Utilities consumption...28
9.7 Mechanical guarantee for internals...28
APPENDIX
TECHNICAL EVALUATION
FIGURE 1 – TYPICAL PROCESS FLOW DIAGRAM OF GLYCOL PACKAGE UNIT
FIGURE 2 – TYPICAL PID OF DEHYDRATION COLUMN AND GLYCOL FINAL COOLER FIGURE 3 – TYPICAL PID OF GLYCOL REGENERATION SKID (LOW CAPACITY)
FIGURE 4 – TYPICAL PID OF GLYCOL REGENERATION SKID (high capacity with fire tube burner)
FIGURE 5 – TYPICAL PID OF GLYCOL REGENERATION SKID (high capacity with external reflux condenser)
FIGURE 6 – CONTACTOR TOP RECOMMENDED ARRANGEMENT FIGURE 7 – LIQUID LEVELS IN DRUMS AND CONTACTOR
FIGURE 8 – LIQUID LEVELS IN REBOILER
FIGURE 9 – EQUILIBRIUM H2O DEWPOINT VERSUS TEMPERATURE AT VARIOUS TEG
1. Scope
This specification covers minimum requirements for the design, manufacture and guaranteed performance of Tri Ethylene Glycol Package Unit.
This general specification does not remove the responsibility of the Vendor. In his proposal, Vendor will outline the clauses of this specification (if any) that are not in accordance with the required performances to be guaranteed.
This specification is specific for Glycol Package Unit consisting of a glycol dehydration column and a glycol regeneration skid. It should be adapted for other case (MEG - DEG injection). Information contained in this specification is Proprietary and Confidential Information and is not be revealed to any outside of the necessary personnel within the bidder COMPANY.
Deviations from this general specification and/or API 12 GDU last edition shall be itemized with full details of proposed alternatives under the heading "Exemptions to Specification" in the Vendor's proposal. Otherwise, it shall be deemed that the equipment offered is in full accordance with the referred documents.
2. Reference documents
The reference documents listed below form an integral part of this General Specification. Unless otherwise stipulated, the applicable version of these documents, including relevant appendices and supplements, is the latest revision published at the EFFECTIVE DATE of the CONTRACT. Standards Reference Title Not applicable Professional Documents Reference Title API 12 GDU API STD 674 Regulations Reference Title Not applicable Codes Reference Title Not applicable
Other documents
Reference Title
GPSA Engineering Data Book
Total General Specifications
Reference Title
GS EP SAF 227 Safety rules for fired heaters
3. General
3.1 Definition of terms
The following terms as defined below have been used through out this specification: • The COMPANY Total
• Engineer As defined in the particular specification
• Vendor MANUFACTURER or Vendor of material and/or equipment.
3.2 Conflictive requirements
In case of conflict between the inquiry and order, the information included in the order shall govern.
In case of conflict between this specification, the documents listed in the requisition and data sheets, the following order of precedence shall govern:
• Local regulations • Purchase requisition • This specification • API 12 GDU last edition
• Particular specifications and data sheets • Engineer's specifications
• COMPANY's documents.
3.3 Referenced documents
The package equipment and all accessories shall be designed, fabricated and tested in accordance with the specifications, codes, standards and regulations listed in the purchase requisition (and specially GS EP SAF 227: “Safety rules for fired heaters”).
3.4 Site environmental conditions
The site environmental conditions are as stated in the particular specification.
The equipment shall be designed to operate satisfactorily over the entire temperature range and other adverse ambient conditions specified in the particular specification.
3.5 Utilities
All available utilities on the field are as stated in the particular specification. Vendor to advise estimated utilities consumption with his proposal.
3.6 Area classification
The equipment shall be suitable for operation in hazardous area Zone 2, Group IIB, Class T3 as a minimum.
4. Scope of supply
4.1 Extent of supply
4.1.1 General
• Engineering services for detailed engineering
• Procurement activities, material and equipment supply • Fabrication and shop erection
• Shop testing and services of personnel required during testing • Inspection, Quality Assurance/Quality Control
• Spare parts for commissioning and start-up
• Special tools for installation and maintenance if any • Packing and marking
• All documents requested in the purchase requisition, including eventually additional documents requested for certification by a third party
• Pre-commissioning, commissioning and start-up procedures • Operating and maintenance manuals
• Mechanical and performance guarantees. 4.1.2 Scrubbing system of the inlet gas
Scrubbing system is composed of a knock-out drum plus an inlet gas filter separator installed upstream of the contactor and equipped with vane packs and cartridge filter for liquid/gas separation.
4.1.3 Glycol dehydration column
The glycol dehydration column equipped with its internal (structured packing or trays and mist eliminators).
4.1.4 Glycol regeneration skid
Equipment for the regeneration skid must include as a minimum: • One flash drum
• One activated carbon filter • One still column
• One integrated reflux condenser or one external reflux condenser with receiver drum and reflux pumps
• One reboiler, equipped either with fire tubes or electrical bundle or hot oil bundle • One stripping column if required
• One or two rich/lean glycol heat exchanger(s) • One surge drum
• Two or three injection pumps (one stand-by) driven by electrical motors, equipped with necessary pulsation dampeners installed both on suction and discharge
• One final lean glycol cooler • One glycol make-up facilities
• One close drain storage with one recirculating pump if required • Two chemical injection skids (pH control, antifoam)
• One CO2 snuffing system.
Fabricated steel skid to mount above equipment, with all necessary access/maintenance platforms, stairways, handrails and walkways.
The total area of the skid is covered with a drip pan to collect all spilled and/or drained liquids. Drip pan is constructed with a minimum slope of 10 mm per meter. The drip pan is provided with a specific valved drain piped (3" minimum) to the edge of the skid at the lowest point. The drain pipe is terminated with a flange.
All on-skid pipework, pipe supports and valves for process, utilities, drains, vents and relief systems.
All instruments, instrument supports, instrument cabling, instrument air headers, cable and/or pipe trays. Control panel will be either locally mounted or installed in control room as per particular specification.
The unit shall be designed in order to avoid piping, valves, vessels, structural and instrument vibration. Adequate supports and structure shall be designed in accordance with the vibration study included in the scope of work.
Internal earthing loop, branch connection with 2 (two) earthing bosses located at opposite sides for external earth connections.
Lighting system if required in the particular specification. Painting of complete package.
Heat insulation required for heat retention or personnel protection as necessary. Check points for corrosion inspection should be accessible through the insulation. Heat tracing when necessary.
Lifting equipment (spreader bar, shackles and slings) to lift the completely assembled unit. Lifting devices for maintenance.
Removable equipment supports as necessary for package transport to site.
Fire and gas detection system if required and as defined in the particular specification or in the safety concept.
Deluge system if required in the particular specification or in the safety concept.
4.2 Supply limits
Vendor shall provide all materials and equipment described in this specification in the particular one and any other item which may be considered necessary for efficient and simple working and maintenance, completely assembled and ready for hook-up to services connections.
The limits of scope of supply shall be as follows:
• Piping: all on-skid process and utilities pipework to terminate by a flange at the skid edge • Electrical: power and control cables will be supplied and installed by COMPANY up to the
A.C. junction box/terminal box complete with glands located on motors and/or electrical bundles. Cable routing, cable trays and supports shall be supplied by Vendor
• Instrumentation and fire and gas detection: wired up to local control panel if installed on skid or to the junctions boxes.
5. Process design minimum requirements
5.1 Main parameters
1. Type of glycol to be used
Use of TEG is only considered in this specification. 2. Water content of Feed Gas
If water content of the wet gas is not given in the particular specification, adopt the higher value of water content obtained with:
• The more conservative correlation from Vendor know how (This one must be presented in the proposal).
• The charts given in the last edition of the GPSA Engineering Data Book with salinity and relative density correction (This value must be multiplied by 1.1),
• The charts given by Wichert in Oil and Gas Journal (March 29, 1993) with salinity and relative density correction (This value must be multiplied by 1.1).
Note:
• In all cases corrections for acid gas components have to be taken into account.
• Water content shall be calculated for the most stringent operating conditions (minimum pressure, maximum temperature).
3. A margin of 5°C on guaranteed dew point value is usually taken depending on contractual penalties attached to this guaranteed value.
4. Glycol flow rate
A low ratio of lean TEG per kilogram of removed water is used when water content is high (low pressure and high temperature feed gas), and high ratio is used when water content is
low (high pressure and low temperature or non water saturated gas) or when the capacity of the dehydration unit is very low.
Table hereafter gives the minimum lean TEG/removed water ratio versus the water content of the wet gas to be used by Vendor.
Water content of wet gas Lean TEG/Removed water
ratio mg/Sm3 kg/MMSCF (x 0.0283) lb/MMSCF (x 0.0624) kg/kg USG/lb (x 0.1089) ≥ 5000 ≥ 141 ≥ 312 15 1.6 3000 - 5000 85 - 141 187 - 312 18 2.0 2000 - 3000 57 - 85 125 - 187 20 2.2 1200 - 2000 34 - 57 75 - 125 22 2.4 800 - 1200 23 - 34 50 - 75 25 2.7 600 - 800 17 - 23 37.5 - 50 27.5 3.0 400 - 600 11 - 17 25 - 50 30 3.3 ≤ 400 ≤ 11 ≤ 25 35 3.8
Furthermore, to insure a good wetting of the structured packing, a minimum glycol flow rate of one cubic meter per hour per square meter of dehydration column area section is requested.
Increasing the glycol flow rate and purity may reduce the structured packing height, but the gain obtained by reduction on the glycol contactor height is counter balanced by the increase of the regeneration unit size since more glycol have to be treated.
5. Purity of the lean glycol
Even if the purity of the lean glycol does not required it, the installation of a stripping column must be considered.
At least, provision for direct stripping gas injection into the reboiler must be provided. (applicable at small units only).
If the wet feed gas is not water saturated the lean glycol purity and the number of equilibrium stage in the contactor will be defined by assuming the feed gas is water saturated.
The lean glycol concentration shall be determined with a margin of 10°C between the required water dew point and the theoretical equilibrium dewpoint.
6. A detailed material balance including all components (H2O, TEG, high and heavy
Glycol losses shall be explicited: liquid carry over and vapor tension in dry gas, flash drum, still column overhead, pumps leakage, etc.
Detailed calculation according to GPSA Engineering Data Book for aromatics shall be submitted to COMPANY.
7. If no aromatic content is specified in the feed gas composition, consider for the design that a minimum value of 10 mol % of the C6+ are composed of aromatics.
Special care must be taken for the design of the stripping column, still column, overhead condenser and charcoal filter to account for aromatics from gas dissolved in the glycol.
5.2 Glycol dehydration column
5.2.1 Scrubbing system of the inlet gas 5.2.1.1 Scrubbing system description
To prevent gas dehydration unit troubles it is essential and highly recommended to have a complete scrubbing of the incoming wet gas always contaminated by solids and free liquids (hydrocarbons, water and specially brine, compressor oil, drilling mud, corrosion inhibitor, pipe dirt, formation solids, etc. …).
Scrubbing system shall be located close to the absorber to prevent condensate forming in the inlet scrubber-absorber line due to pressure drop and ambient temperature effect (line shall be insulated). Scrubbing system is composed of:
1. a knock-out drum, not part of the package unit, to separate the liquid slugs carried by the wet gas,
2. a filter/separator installed downstream the knock-out drum, to remove liquid droplets or dust particles contained in the gas leaving the knock-out drum (carry over).
Filter/separator may be part or not of the glycol package unit. If the supplier of the glycol package unit must guarantee the efficiency of this unit it is a good practice to consider filter/separator part of the package unit.
Note:
1. knock-out drum is a 3 phases separator.
2. It is not recommended to integrate an inlet separator at the bottom of the dehydration column (or contactor) instead of the scrubbing system.
5.2.1.2 Gas filter/separator description and performance
This filter (horizontal or vertical) will be a two stages filter (solids filtrations and coalescing of the small liquid droplets: cartridges - liquid removing: vane pack) and will achieve the following functions:
• Removing of the solid particules. This filter will be designed to remove 99.0 % of the particules with a diameter greater than 1 micron.
• Coalescing of the liquid fog contained in the gas and removing with high efficiency the coalesced droplets. This filter will be designed to remove 99.0 % of the liquid droplets with a diameter greater than 0.3 microns. If not specified in the particular specification, this filter will be also design for:
• Liquid content of the inlet gas: 1 m3/106 Nm3 of gas or 1000 ppm wt
• Liquid content of the outlet gas: 5 liter/106 Nm3 of gas or 5 ppm wt.
Operating pressure of the first section is equal at the operating pressure of the second section plus the gas pressure drop through the cartridges. Since the operating pressures in the two sections can be different by 0.5 bar (with fouled cartridges), each section shall be equipped with its own liquid outlet and its instrumentation.
No spare is required for this service, but a by-pass of the filter with isolating valves will be installed.
This filter will be equipped with a quick opening closure. It will be also equipped with depressurization and nitrogen inerting facilities. Provision for future methanol injection will be provided in the two liquid outlets.
Ladders and/or platform brackets are provided.
Heat tracing of level instruments has to be carefully studied to avoid hydrates formation in dead ends during cold season under wind effects.
Minimum instrumentation:
• Level controller with automatic level control valve on the two liquid outlets • Level glasses
• Low low level switch with emergency shutdown valve on the two liquid outlets • High high level switch with alarm on the second stage
• High differential pressure gauge/alarm • Pressure safety valve
• One BDV (if required). 5.2.2 Dehydration column
The glycol contactor is normally fitted with structured packing. Nevertheless bubble cap trays contactor can be considered for special cases (onshore project with low gas pressure).
An overdesign of 10 % on the maximum operating gas flow is to be considered for the design of the dehydration column, to take into account gas flow fluctuations.
Gas distribution system at the bottom of the contactor and top glycol distributor tray shall be guaranteed by the structured packing Vendor. An inlet divertor and a tray must be fitted at the gas inlet section. Their design has to insure a good gas distribution through the structural packing by avoiding channelling.
The minimum glycol surge (NLL-LAL) time in the dehydration column is 10 minutes (see figure 7 – Liquid levels in drums and contactor).
For contactor levels could be installed in the hemispherical head with a minimum distance of 300 mm for the LALL/bottom distance.
The diameter of the column and the height of structured packing are calculated and guaranteed by the SUPPLIER/MANUFACTURER of structured packing.
The minimum height of structured packing is 3 meters. The minimum number of trays is 6.
At the top of the dehydration column, a mist eliminator to eliminate 99.0 % of droplets larger than three microns plus a vane pack are installed to minimize glycol looses which are guaranteed for less than 10 l/106Nm3 (0.07 USG/MMSCF).
The distance between the top of the structured packing and the mist eliminator must be at least 1200 mm. The distance between the mist eliminator and the vane pack must be at least 400 mm.
Any liquid collected from the vane pack shall be drain to avoid reentrainement and foaming. The distance between vane pack and top must be at least as shown on figure 6.
Installation of an external filter downstream of the contactor to minimize TEG looses could be considered for particular projects (Supply of glycol is difficult. Liquid glycol is not acceptable in the treated gas).
Insulation of the dehydration section has to be provided to avoid hydrocarbon condensation during cold season, specially in hot countries, or in country with heavy rains.
Instead of insulation, protection against heavy rain could be acceptable for tropical countries. In any case, insulation supports are provided.
Ladders and/or platforms brackets are provided.
Heat tracing of level instruments has to be carefully studied in dead ends during cold season and/or under wind effects.
316L stainless steel lining up to one meter in the structured packing bed shall be provided. In case of presence of H2S, the whole column should be preferably 316L SS cladded (advise from
TDO/TEC corrosion specialist is required, depending on the H2S content).
Skimming device must be installed inside the glycol column to remove possible hydrocarbon carried over from the upstream equipment (bypass of the inlet gas filter) or condensed in the glycol contactor (retrograde condensation) (see figure 2 – Typical PID of dehydration column and glycol final cooler).
Interface level glass shall be installed to allow hydrocarbon skimming. Minimum instrumentation:
• Level controller with automatic level control valve (See note) • Level glass
• Low low level switch with emergency shutdown valve on the glycol outlet • High high level switch
• Differential pressure gauge with alarm high across the structured packing • Pressure safety valve
• BDV (if required): two BDV's upstream and downstream of the packing shall be preferably installed to avoid high flow rate through the packing (refer to PID figure 2).
Note: Level control valve for glycol outlet should be preferably located on the regeneration skid to avoid vibration due to long two phases flowline.
5.3 Glycol regeneration skid
5.3.1 Flash drum
This drum is an horizontal three phases separator.
Operating temperature of the flash drum must be included in the range 70 to 100°C. If necessary, one rich/lean glycol heat exchanger must be installed upstream the flash drum. Normal operating pressure of the flash drum is 2 to 5 bar g.
An impactor is located on the glycol inlet, vortex breaker is located on glycol outlet. The design of this flash drum can be based on:
• Either a vertical weir to separate TEG from liquid hydrocarbons, in this case a vortex breaker is located on liquid hydrocarbons outlet
• Or a liquid hydrocarbon outlet formed by a vertical pipe connected to an horizontal pipe, located inside the flash drum at a level higher than the TEG high high level switch. The two ends of the horizontal pipe are closed and several ports are located on the lower part of the pipe. Total area of the ports is twice the area of the nozzle.
Retention time of glycol in the flash drum is at least 30 minutes (see figure 7 – Liquid levels in drums and contactor).
Minimum requirement for liquid levels are two minutes of glycol flow rate or 100 mm between: • Normal Liquid Level (NLL) and alarm levels
• Alarm levels and shutdown levels.
Sizing of the glycol level control valve must take into account solubility of natural gas in glycol. Calculation of vaporization of all components of gas, including H2S, CO2, heavy hydrocarbons,
aromatics, etc., has to be done prior to valve sizing. Pressure Safety Valve is sized for the two following cases:
• Case one: external fire
• Case two: gas coming from the glycol dehydration column considering that glycol level is lost in the glycol dehydration column and glycol level control valve of the glycol dehydration column and by-pass valve are full simultaneously open.
In case of glycol contactor operated at high pressure, two LCV (one in operation, one in stand-by) with one manual interlock of the upstream block valves can be installed in order to reduce gas blow-by flowrate and therefore the size of this PSV.
Insulation for heat conservation or insulation for personnel protection can be necessary. Mechanical design pressure of flash drum to be at least 10 bar g.
Minimum equipment, instrumentation:
• Glycol and hydrocarbons level controllers with automatic control valves (See note) • Level glasses for glycol/hydrocarbons and hydrocarbons/gas interfaces (See note)
• Glycol high high level switch with emergency shutdown valve on the glycol inlet to avoid glycol losses
• Two pressure control valves one to release pressure to the flare, the other to maintain a blanketting fuel gas pressure in the vessel
• Pressure safety valve • Pressure gauge • Temperature gauge
• Flow indicator with isolating and by-pass valves located on the glycol outlet piping
• Three liquid sample connections located at the glycol/liquid hydrocarbon interface level, at plus 150 mm and at minus 150 mm.
Note: The position of the nozzles of the level instrument should be:
• TEG/HC liquid phases interface: One nozzle in TEG and one nozzle in HC liquid phase • HC liquid/gas interface: One nozzle in HC liquid phase and one nozzle in gas phase. 5.3.2 Cartridge filters
Two identical cartridge filters are installed on the rich glycol line leaving the flash drum: one in operation, one in stand-by.
Each filter is designed to handle 125 % (one hundred and twenty five) of the total flow of rich glycol.
Pressure drop through the cartridge filter will not exceed: • Clean condition: 0.1 bar
• Fouled conditions: 0.7 bar.
Filtration efficiency of cartridge filters is an absolute efficiency of 99 % for any particles with diameter greater than 10 microns under normal conditions.
Minimum filtration area is 0.2 m2 per m3 of TEG.
During initial start-up one set of cartridges per filter shall be provided to remove 99 % of all solid particles 25 microns and over. They will be supplied as commissioning spare parts.
Each filter shall be equipped with a connected vent line with a sight flow indicator (to check if gas is trapped at the top of the filter).
Design of filters (bolted cover for high pressure and quick release cover for low pressure complete with safety interlocks to prevent accidental opening under pressure) and adequate access allow a quick change of cartridges.
Insulation for heat conservation or insulation for personnel protection can be necessary. Mechanical design pressure of cartridge filter to be at least 10 bar g.
Minimum equipment, instrumentation: • Isolating, vent and drain valves • By-pass valve
• One pressure safety valve • One differential pressure gauge. 5.3.3 Activated carbon filter
This filter is designed to handle a minimum of 15 % of the rich glycol flow rate, flow balance is flowing through the bypass.
Pressure drop through the activated carbon filter will not exceed: • Clean condition: 0.1 bar
• Fouled conditions: 0.7 bar
Activated carbon is contained in cartridges in order to facilitate maintenance and to avoid activated carbon particles carry over.
Design of filter (quick release cover complete with safety interlocks to prevent accidental opening under pressure) and adequate access allow a quick change of cartridges.
Insulation for heat conservation or insulation for personnel protection can be necessary. Mechanical design pressure of activated carbon filter to be at least 10 bar g.
In case of presence of aromatics in high concentration, installation of activated carbon filter on the lean glycol has to be carefully studied (downstream injection pumps or partial pump around on the surge drum).
Minimum equipment, instrumentation: • Isolating, vent and drain valves • Bypass valve
• One pressure safety valve • One differential pressure gauge. 5.3.4 Still column
The still column is fitted with two beds of one meter high minimum of 316 stainless steel random packing (PALL rings or equivalent) per bed.
Ceramic saddles are prohibited.
Each bed of packing is limited by a supporting grid and a liquid distributor tray. Design of internals allows an horizontal transportation of the column.
Design of the column allows packing installation with minimum operation and maintenance personnel.
Insulation for heat conservation is required.
Still column to be in corrosive resistant material (SS 316L or equivalent).
Design pressure of still column to be in accordance with maximum operating pressure of the flare and to be at least 2 bar g.
Minimum instrumentation:
• Temperature gauge on the vapor outlet. 5.3.5 Still column condenser
The reflux condenser shall be sized for a minimum reflux ratio of 30 % based on the total quantity of water to be removed.
Design pressure of still column to be in accordance with maximum operating pressure of the flare and to be at least 2 bar g.
5.3.5.1 Solution with integrated condenser This solution is applicable for units with low capacity.
This reflux condenser located at the top of the still column is a shell and tubes heat exchanger (coil must be avoided).
Insulation for heat conservation is necessary (heavy rain). Minimum equipment, instrumentation:
• Upstream isolating and manual control bypass valves
• Temperature gauges located upstream the condenser and downstream the bypass. 5.3.5.2 Solution with external condenser
This condenser allows to condensate the maximum of water and heavy hydrocarbons. Heat exchanger type: air cooler or cooling water. Refer also § 5.3.11.2 and § 5.3.11.3. Receiver drum:
• Type: horizontal 3-phase separator (vertical drum could be acceptable depending on disposal of condensed water)
• Gas to be sent to the LP flare
• Recovered liquid hydrocarbon should be sent by gravity to the oily closed drain system through a siphon (safety precaution must be considered to avoid back pressure from other close drains). If pressure allows a control valve should be installed (refer to PID in appendix)
• Condensed oily water: to be pumped, partially to the still column to assure the reflux through a flow control valve, balance to the oily water treatment through a level control valve
• Minimum instrumentation: • Level glass on the water side
• Low low level switch on the water side to shut-off the recirculating pump • Temperature gauge
• Instrumentation requested following the chosen solution. Condensed reflux pumps
• Two pumps are installed: one on duty, one stand-by
• These pumps are electric motor driven centrifugal pump and are installed complete with isolating valves, non-return discharge valve, inlet "Y" strainer, discharge pressure gauge and recirculating pressure safety valve.
Piping
• Special care should be taken when selecting material as condensed water could be corrosive.
5.3.6 Reboiler
Design of the glycol regeneration unit should be based on a temperature at the reboiler not exceeding 204°C. If possible a lower temperature should be selected.
• A detailed calculation note of the reboiler duty must be submitted to COMPANY for approval.
The reboiler duty is calculated taking into account the following assumptions: • Inlet temperature of rich glycol not higher than 150°C
• Reflux in still column considered as 30 % of water flow to be removed as a minimum • Desorption of aromatics if any
• Thermal losses to be calculated.
Duty of reboiler has to be oversized, to take into account start-up periods, as follows: • 20 % for electrical heaters
• 10 % for hot oil or fire tube reboilers.
Duty of the reboiler expressed in kcal per kg of water removed must not be lower than:
Lean TEG/Water ratio, kg/kg 15 25 35
Calculated 1,380 1,720 2,070
Installed (oversizing included)
• Hot oil or fire tube (Note 1) 1,520 1,890 2,270
• Electrical 1,660 2,060 2,480
Above data are based on:
• Temperature of rich glycol of 150°C at still column inlet • Reflux of 30 %
• 10 % of thermal losses
• No aromatics, in the rich glycol.
Note 1: Formula for interpolation: Q = kg/kg x 37.5 + 957
• Average heat flux across fire tube or electrical bundle wall cannot exceed 20,000 kcal/h m2 (2.3 W/cm2) at design duty. Calculation shall be provided to COMPANY. In any case, the skin temperature of the heating element will not exceed the degradation limit of glycol, i.e. 230°C.
Detailed calculation must be provided.
• Two coils to heat fuel gas are installed in the bottom of the reboiler: • The first one to heat the stripping gas up to 120/150°C
• The second one to heat the burner fuel gas up to 60/80°C.
A drain pot, with a manual drain, is installed upstream the preheating coils. • Insulation for heat conservation is required.
• Design pressure of the reboiler to be in accordance with maximum operating pressure of the flare and to be at least 2 bar g.
• Minimum instrumentation: • Pressure gauge
• Pressure Safety Valve (PSV) calculated for reboiler blocked outlet and fire case • Temperature controller
• Temperature gauge • High temperature alarm • High high temperature switch • Low temperature alarm
• Low low temperature switch if requested by the gas processing • Level glass
• Low low level switch located at the top of the fire tube or electrical bundle. • Minimum instrumentation on the stripping gas line:
• One automatic pressure control valve • One pressure gauge
• One flow indicator with manual adjustable, isolating and bypass valves • One temperature indicator.
5.3.6.1 Hot oil reboiler
If hot oil (minimum temperature 250°C) is available on site, this technology is the preferred one. Hot oil bundle is made from "U" tubes, 1" diameter.
Bundle is removable. 5.3.6.2 Fire tube reboiler
This technology is used for heavy duty reboilers.
Section of fire tube has to be calculated with a heat flux not exceeding 20 000 kcal/(h.m2) based on design duty of the burner.
Multi return tubes directly welded on the main tube require COMPAGNY approval. Direct fired U tube type is preferred. Mitre bend both sides welded (internal, external) is acceptable.
Fire tube must be seamless type.
When length of fire tube is longer than 10 meters or diameter > 24", or when duty to be transferred to TEG is higher than 750,000 kcal/h, two fire tubes must be preferably installed. In case of duty to be transferred higher than 1,500,000 kcal/h i.e. quantity of water to be removed higher than about 800 kg/h, two reboilers should be preferably installed.
Fire tube is properly supported and the supports are designed taking into account the differential expansion between the shell and the fire tube. Fire tube shall be field removable for inspection. Minimum wall thickness of the fire tube must be 10 mm.
To ensure that fire tube is always immersed in glycol, normal liquid level must be 150 mm above the fire tube (see figure 8 – Liquid levels in reboiler).
Thermal duty of the burner must be at least 1.7 time the heat to be transferred to the TEG. A heat resistant firing cylinder where the flame burns is located in the fire tube. Tertiary air with manual tertiary air register control is flowing between the cylinder and the fire tube.
A peep hole allows to inspect the flame pattern (main flame and pilot) within the burner and fire tube.
The vent stack shall be externally supported on an appropriate structure and fitted with a spark arrestor.
Air Flow and fuel/air radio control: Forced draught is the preferred solution. For details refer to Total General Specification GS EP SAF 227 Safety rules for fired heaters.
Dampers and flame arrestors: gas tight dampers shall be installed on the air inlet of the forced draught fired heaters. Refer to GS EP SAF 227.
Igniters: Each burner shall be provided with its own igniter. "Pilots" shall be avoided. Refer to
GS EP SAF 227.
The flame detection system is either an Ultra Violet self-checking detector or an ionization rod. Flame detectors based on temperature effects are not accepted.
The safety shutdown system is closing fuel gas to the main burner (and to the pilot, if pilot is designed for a continuous operation) under the following abnormal conditions:
• Too high fuel gas pressure • No flame
• Too high reboiler temperature • External ESD
• High temperature (TSHH) in the stack.
Two automatic SDV valves and one automatic purge valve are installed on the main burner line and on the pilot line.
For small duty natural draft burner could be acceptable subject to a derogation from COMPANY. In this case:
• Primary and secondary manual air registers are provided.
• Air intake(s) to burner prevents wind blow dust to enter the burner and is fitted with a flame arrestor(s).
• The ignition system includes a forced purge cycle to prevent the introduction of fuel gas into the fire tube before the pre-set purge cycle is satisfactorily completed.
• The system includes a flame detection device on the pilot burner which prevents the opening of the main burner control valve until the pilot flame is established and detected. Following calculations have to be submitted:
• Pressure drop across the air inlet, including flame arrestor, fire tube and stack. To be acceptable, the chimney draft has be to higher than the pressure drop by a minimum of 30 %.
5.3.6.3 Electrical bundle
This technology which is reliable and easy to operate must be considered especially for low duty reboilers.
• An extra 10 % electrical resistances is installed but not connected, to allow good operation of the plant in case of failure of some resistances without heavy maintenance works. • Temperature control:
If not mentioned in particular specification or data sheet, regulation may be 100 % via thyristor power (For electrical power less than 100 kW).
For higher duty, the control system should be based on a mixed system in order to avoid disturbances due to harmonics. This system includes:
• n sets of resistances fed in mode ON/OFF by means of electromagnetic contactors. These sets of resistances ensure the bulk regulation of the temperature
• One set of resistances fed via a power thyristor. This set of resistances insures the trim regulation. Thyristor technology will be of batched full series waves type.
• Shutdown system: the protection of the electrical heater is performed through: • One high high temperature switch on the TEG liquid to shut-off the electrical power
• Four high temperature switches on skin temperature of resistances: two installed on ON/OFF fed resistances of different types (RTD and thermocouple), and two installed on thyristor fed resistance. In case of one high temperature detected by one detector, the electrical heater is automatically shut off
• Low Liquid Level (LSLL) • External ESD.
5.3.7 Stripping column
The stripping column is fitted with one bed of 1.2 meter high minimum of 316 stainless steel random packing (PALL rings or equivalent).
Ceramic saddles are prohibited.
The packing is limited by a supporting grid and a liquid distributor tray. Design of internals allows an horizontal transportation of the column.
Design of the column allows packing installation with minimum operation and maintenance personnel.
A balance line allows the stripping gas to flow to the reboiler in a different pipe than the glycol to avoid any disturbance to the glycol.
Insulation for heat conservation is required. No instrumentation is required.
5.3.8 Rich/lean glycol heat exchanger(s)
For the case with external reflux condenser, a rich/lean heat exchanger must be installed upstream the flash drum in order to operate the flash drum at a temperature of 70°C minimum. For the case with integrated reflux condenser the glycol entering the flash drum is heated in the exchanger installed on top of the still column.
On lean glycol stream heat exchangers may be located between the stripping column and the surge drum, or between the surge drum and the injection pumps.
Rich/lean glycol heat exchangers are welded stainless steel plate heat exchangers (compabloc from VICARB or equivalent).
Plate and gasket heat exchangers are prohibited due to leaks during transitory periods. An over design of 25 % extra heat transfer area is taken for fouling.
Insulation for heat conservation is required. Minimum instrumentation:
• Four temperature gauges located on the inlets and outlets of the heat exchanger. 5.3.9 Surge drum
The surge drum (see figure 7 – Liquid levels in drums and contactor) is sized as follow:
• Low low level shutdown is not lower than 200 mm above the lowest point of the shell or 30 seconds on glycol flow rate, whichever is the highest.
• The glycol volume between the Low Level Alarm and the Low Low Level shutdown (LAL-LALL) is at least 3 (three) days of estimated consumption of the whole glycol package unit (1) or 100 mm.
• The glycol volume between the low level and high level alarms (LAL-LAH) is at least 15 (fifteen) days of estimated consumption of the whole glycol package unit (1)
• If not specified in the particular specification, the capacity of the reboiler plus the glycol dehydration column, considered at the working temperature, must be stored above the high level pre-alarm.
Note 1: Estimated consumption based on 1 l/MMSCF (35.4 l/106 Sm3) or guaranteed value whichever is the highest.
Insulation for heat conservation is not required, insulation for personnel protection may be necessary.
Minimum instrumentation: • Level glass
• Low level alarm • Low low level switch • High level alarm.
5.3.10 Glycol circulation pumps
The pumps (one or more on duty, one stand-by) are positive displacement type designed to API STD 674. Nevertheless, speed values indicated in Table 1 of API 674: maximum allowable speed ratings for power pumps in continuous service must be decreased by 20 %.
Pumps are heavy duty pump types.
Crankshaft is made of forged steel. Pumps valves and seat shall be hardened 410 SS. Plunger shall be colmonoy overlay and pump packing shall be braided PTFE.
The pumps are mounted on a fabricated baseplate complete with electrical motor and drive mechanism entirely protected. Pump shall be driven by constant speed electrical motors. Motor horsepower shall be adequate for 110 % of the maximum flow rate and maximum pressure drop.
During normal operation, suction temperature shall not exceed 90°C. Suction pressure has to be higher than atmospheric pressure.
Suction and discharge piping must be equipped with static pulsation dampeners.
Pulsation dampener calculations taking into account the pump, the suction and discharge line characteristics must be submitted to COMPANY.
Pneumatic pulsation dampeners are prohibited to avoid any malfunction due to bad pressure setting.
NPSH calculations shall be provided.
A minimum margin of 1.5 meters is to be planed between the required and the available NPSH. Liquid velocity expressed in m/s on suction and discharge lines of the injection pumps shall not exceed.
RPM of pump Suction Discharge
250 max. 0.6 1.8
330 max. 0.45 1.35
Over 330 0.3 0.9
The suction piping shall be one or two time larger than the suction connection of the pump (API 12 GDU - D10). It should be short with a minimum of elbows and fittings.
Minimum equipment, instrumentation:
• Suction "Y" strainer with baskets, which can be removed without dismantling pipework, and isolating valve. The filtration area of the baskets is sufficient to assure one month filtration without any cleaning
• Suction pressure gauge
• Discharge pressure safety valve • Discharge pressure gauge
• Discharge check valve with isolating valve
Note: All equipment installed from suction isolating valve (included) must be designed for the same rating than the discharge line if automatic change from one pump to the other is requested in the particular specification.
5.3.11 Final lean glycol cooler
This final lean glycol cooler, installed upstream the absorber, must be designed with an outlet temperature of lean glycol 5 to 10°C higher than the dry gas temperature.
Temperature of lean glycol must be higher than temperature of dry gas to avoid hydrocarbon condensation at the top of the adsorber that can create foaming problem.
Temperature of lean glycol must be as low as possible to enhance water absorption and to reduce glycol losses.
10 % of extra surface must be provided as margin for fouling.
Insulation for heat conservation is not required, insulation for personnel protection may be necessary.
Minimum instrumentation:
• One temperature gauge on the TEG outlet. 5.3.11.1 Dry gas/Lean glycol heat exchanger
This heat exchanger is of shell and tube type installed vertically on the dehydration column. This solution is technically acceptable if there are not limitations on the gas pressure and the gas temperature (Through this heat exchanger dry gas temperature rises and dry gas pressure drops).
Drawback: temperature of lean glycol leaving this heat exchanger is gas flow rate dependent. This solution does not allow an accurate control of this temperature.
5.3.11.2 Cooling water/Lean glycol heat exchanger
If soft cooling water is available on site, this solution is technically acceptable.
If cooling water available on site is seawater, this solution should be avoided taking into account the fouling and corrosion problems.
Additional minimum instrumentation: One differential temperature controller (between dry gas and lean glycol temperatures) with temperature control valve located on the water network. 5.3.11.3 Air cooler
This solution is technically acceptable and should be used if dry gas or soft cooling water cannot be used.
The thermal rating shall be determined by the Vendor who shall demonstrate that hot air recirculation has been taken into account, either by means of preventing hot air recirculating, when the overall layout has to be considered, or by raising the design air inlet temperature. Air temperature indicated in basis of design corresponds to still air in open space. Consideration shall be given to proximity of reboiler, chimney hot equipment, possible recirculation of hot air, additional radiations from surrounding reflecting surface.
Exchangers shall be designed for 110 % of the maximum specified process flow conditions. The Vendor shall ensure that the specified heat duty includes this extra 10 % and shall state this clearly on the data sheet.
In anticipation of fouling and possible damage to fins, the rating of the motor and the corresponding point on the fan characteristic performance curve shall each be advanced by a factor of 1.2 times the air side pressure drop over the bundle. The motor rating thus calculated shall be checked for the condition at specified minimum air temperature.
Turbulators in lean glycol air cooler are acceptable.
Additional minimum instrumentation: One differential temperature controller (between dry gas and lean glycol temperatures) with temperature control actuating the louvers of the air cooler or a control by-pass valve.
5.3.12 Fresh glycol make-up facilities Fresh glycol make-up facilities consist of:
• One glycol storage tank
• One glycol make-up pump to fill the surge tank.
Fresh glycol storage tank (preferably installed, refer to data sheets):
• Size: two weeks of estimated TEG consumption of the whole glycol package (refer to note 1 § 5.3.9)
• Minimum instrumentation: • Level gauge
• Blanketing with fuel gas: one PCV to pressurize the tank, one PCV to release the pressure to the flare
• One pressure relief valve. Fresh glycol make-up pump:
• Electric motor driven centrifugal pump with local ON/OFF pushbutton, or pneumatic pump manually operated
• Complete with isolating valves, discharge non-return valve, upstream pressure relief valve • To avoid too large flow of cold glycol to the hot surge drum, a manual flow control valve is
provided with a pump mini flow
• One solid particule filter to be installed at the pump discharge.
Glycol filtration: For gas with a high aromatic content it is recommended to install the possibility to send a part of the regenerated glycol (without aromatics) into the charcoal filter by using the make up pump, refer to PID 0004 (Figure 5 – Typical PID of glycol regeneration skid – high capacity with external reflux condenser) for optional possibility.
5.3.13 Closed drain facilities
These facilities should be preferably installed to avoid pollution of the oily water treatment by the glycol.
• Close drain facilities consist of:
• One close drain storage tank to recover close drain from the pumps, the filters and the level instruments if required
• One recirculating pump to empty the drain storage tank into the surge drum. • Close drain storage tank
• Size: 1 cubic meter
• Minimum instrumentation: • Level gauge
• One pressure relief valve • One vacuum relief valve. • Recirculating pump:
• Electric motor driven centrifugal pump
• Complete with isolating valves, discharge non-return valve, upstsream filter and recirculating pressure relief valve.
5.3.14 Chemical injection facilities Chemical injection facilities may consist of:
• One atmospheric tank with one dosing pump for the injection of the PH control/corrosion inhibitor chemical (same chemical for the two functions).
• One atmospheric tank with one dosing pump for the injection of anti foam chemical. Typical quantity to be injected in glycol is 0.1 to 1 liter per cubic meter of glycol.
Common products used for pH control and corrosion inhibitor are NACAP, NORUST, etc.
6. Safety
6.1 Glycol skid
Number of flanges on fuel gas and glycol piping shall be reduced to a strict minimum. Instruments on reboiler and glycol flash drum, drain points (process and instruments) and flanges shall be located as far as practicable from the combustion air inlet.
6.2 Gas and fire detection
The gas dehydratation package shall have fire detectors designed and installed integrated into package. The detection signals are transmitted to F&G systems in the control room.
In the vicinity of each glycol reboiler air inlet gas detection shall be provided connected to the F&G system.
6.3 Fire-fighting
The CO2 fire-fighting fixed equipment is included into gas dehydratation units.
Note: Requirement for F&G detection and CO2 fire-fighting system are defined in the particular
specifications or in the safety concept.
7. Layout and general requirements
The design and layout of the package must take into account the need for regular maintenance. Equipment and piping arrangement shall afford adequate safe access for operation, maintenance and component removal for equipment, tube bundles, valves and controls.
For this purpose safe access ladders, platforms and railings shall be provided according to the project standard.
For protection of personnel (for operating temperature above 70° C) the contact preventing protection or the insulation shall be provided by Vendor.
The maximum temperature of any non electrical equipment under normal operating and abnormal conditions, shall not exceed 250°C. This requirement can be fulfilled either by thermal insulation or by construction glycol reboiler external hot parts (T > 250°C) shall be heat insulated (as gas tight as practicable) even if not located in a hazardous area as they are in a restricted area.
Check points should be accessible for corrosion inspection through the heat insulation.
Platform, ladders, railing, piping, etc., shall be removable where required for shipping, installation, and major maintenance.
Drip pans and trays shall be integral with the skid such that under no circumstance can glycol/hydrocarbon liquids be spilled into the surrounding areas.
The skid shall be provided with integrated drip pans and they shall have sloped bottoms and flanged drain nozzles(s) at the edge of the base frame.
The Vendor shall avoid protrusion of piping, structural, electrical and instrument installation outside the boundary limits of the package. Where design or drawings incorporate such protrusions, the Vendor shall provide adequate temporary supports and/or protection devices as necessary to prevent any damage of such items during transportation, lifting or installation. Where specified on the drawings, protrusions such as platforms and stairways are to be removable and installed separately.
Grating shall be provided where personnel access is required for operation and regular maintenance.
Lifting pads shall be installed for skid handling.
8. Minimum information to be supplied by Vendor
8.1 Tender documents
• Data for bid tabulation refer to appendix for example • Process flow diagram
• P&ID (the typical PID's included in the call for Tender must be followed as close as possible by the Vendor)
• Layout with main dimensions
• Equipment data sheet with details of internal specially for glycol contactor inlet gas filter, flash drum, surge drum and reboiler, fouling factor for exchangers, etc.
• Glycol purity/flow rate
• Process calculation notes (water content, glycol purity and flow rate, gas velocity in contactor, etc.)
• Maximum guaranteed glycol losses in the contactor and in the regeneration package • Number of theoretical trays or height of packing in the glycol contactor and still column • Reboiler duty, heater surface temperature, heat flux and any allowance made for fouling
of heaters
• Vendor calculation/data sheets for exchanger, air cooler and pumps (if available)
• Wheter derating factors (if any) have been applied to column loading to account for foaming
• Detailed weight breakdown (dry, operating, test, lift)
• Utility consumption (normal and peak rates) including electrical power, fuel gas, cooling water, instrument air, chemical product, etc. Individual motor horsepower ratings shall be furnished
• Recommended spare parts for two years operations • Recommended spare parts for commissioning and start-up
• Fabrication, inspection and testing capabilities of Vendor and any Vendors proposed • Place of fabrication and final assembly including methods of transportation and shipment
to site
• References list.
8.2 Documents for approval during detailed engineering
• All tender documents reissued for approval • Logic diagrams
• Estimated glycol inventory of the system
• Calculated and required NPSH for the glycol pumps • Vibration study
• Calculation for reboiler burner
• Dimensioned outline drawings showing plans and elevations of all equipment and components on the glycol contactor and regeneration package and location of piping/electrical/instrumentation terminations on the contactor and the package
• COMPANY connection requirements of all interface connections for piping, electrical and instrumentation, details of method to support reboiler package on deck (bolts, welding, etc.)
• CO2 fire-fighting system specification
• Skids dimensions, weights, centrum of gravity indication, lifting lugs/trunnions position • Lifting procedure
• Interconnecting data for piping, electrical, instrumentations.
8.3 Final documentation
• All documents here above
• VENDOR catalogue data of major equipment including pumps, exchangers, filters, etc. • Operating manual
• Maintenance manual.
9. Process guarantee
9.1 Water content
The water content of the dry gas shall be guaranteed for the design conditions.
9.2 Turn down ratio
Gas phase: 30 to 110 % of the design flow rate or as specified in the data sheet if more stringent turndown ratio is required.
9.3 Inlet gas filter separator
• Maximum pressure drop across the filter: 0.1 bar (clean)
• Liquid content of the outlet gas: 5 liters per 106 m3 of gas or 5 ppm wt
• Filtration efficiency: 99 % on liquid droplets with diameter greater than 0.3 microns
9.4 Pressure drop/Temperature increase in the contactor
Pressure drop through glycol contactor shall not exceed 0.5 bar.
Gas temperature shall not increase by more than 3°C, providing glycol inlet temperature does not exceed specified operating value.
9.5 Glycol losses
Process glycol losses shall not exceed 10 liters/106 Nm3 (0.07 USG/MMSCF) for the contactor, and 4.3 liters/106Nm3 (0.03 USG/MMSCF) for the skid.
This excludes leakage at valve and pump packing and spillage to drain system.
9.6 Utilities consumption
Utilities consumption (electricity, fuel gas, instrument air, etc.) and stripping gas flow rate shall be guaranteed.
9.7 Mechanical guarantee for internals
Technical evaluation
Process evaluation Unit Recom'ded
value Vendor data Comment
General data Gas Flow rate
Normal MMSCFD
Design MMSCFD
Nm3/h
kg/h
Gas temperature (maxi) °C
Gas pressure (mini) barg
Gas density kg/m2 Water content • Feed kg/MMm3 • Export kg/MMm3 Water to be removed Normal kg/h Design kg/h Glycol
Mini. Flow rate kg/kg water
Lean glycol flow rate kg/h
Process data
Glycol circulation rate m3/h
Purity of lean glycol prior to stripping %
Purity of lean glycol after stripping %
Purity of rich glycol %
Stripping gas rate scf/gal lean TEG
Process evaluation Unit Recom'ded
value Vendor data Comment
Guaranteed values
Total glycol losses l/MMSCF 0.4
Inlet gas filter:
• Filtration efficiency 99 % - micron 1
• Liquid content in outlet gas ppm 5
Pressure drop in contactor bar < 0.1
Fuel gas consumption MMSCFD
Utility consumption Fuel gas: • Stripping MMSCFD • Burner MMSCFD Max garanteed value Electricity kW Instrument air Nm3/h Equipmentdata Gas filter separator
Guaranteed performance (liq.) ppm wt 5
Diameter x Length m x m -
Pressure drop (clean) bar 0.3
Glycol contactor
Gas velocity m/s
Diameter m
Length/height m -
Packing height/nb of tray m
Packing type/tray type Melapach 250Y
Packing/manufacturer/tray Sulzer
Top vane pack area m2
Top mesh pad area m2
Distance packing/vane pack m
Distance vane pack/mesh m
Top mist eliminator efficiency
316L cladding height m
Skimming device - Yes
Process evaluation Unit Recom'ded
value Vendor data Comment
Gas inlet/outlet connections
Regeneration skid Flash drum
H or V H
Diameter x length m x m -
Pressure (operating) barg 3 - 5
Pressure (design) barg 10
Temperature op/design °C 90/105
Baffle or inside skimming device B
Volume m3
Corrosion Allowance (CA) mm
Cartridge Filters
Design flow rate % 125 % glycol
Delta P clean/dirty bar 0.1
Filtration area m2/m3 glycol 0.2
Set of cartridge for start up Yes
Particle to be removed micron 99 % >10 μm
Diameter x length m x m
Cartridge size/number
Design pressure barg
Insulation
Activated carbon filters
Design flow rate % 15 % glycol flow
Pressure drop clean/dirty bar 0.1/-
Design pressure barg 10
Insulation Yes
Diameter x length m x m
Volume m3
Still column
Diameter x height m x m -
Bed 1 height/bed 2 height m/m 1/1
Packing type PALL rings
Material SS
Process evaluation Unit Recom'ded
value Vendor data Comment
Insulation Yes
Still Column Condenser
Reflux ratio % prod. water 30 %
Material SS
Design pressure barg > 2
Duty MMkcal/h
Temperature in/out °C
Integrated or external ext.
Area m2 Length x width m x m Motor kW Receiver Drum H or V H Baffle Baffle
Design pressure (barg) 2
Material SS
Diameter (OD) x Length (TT) m x m
Volume m3
CA mm
Reflux pumps
Nb. 2
Flow rate m3/h
Pressure drop bar
Temperature °C Power kW
Process evaluation Unit Recom'ded
value Vendor data Comment
Reboiler
Diameter x length m x m
Glycol temperature °C < 204
Inlet temperature °C < 150
Oversizing factor % 10 %
Operating pressure barg
Duty MMkcal/h
Average heat flux kcal/h.m2 20,000 maxi
Maximum skin temperature °C 230
Coil for fuel gas: temp. outlet °C 60/80
Coil for stripping gas: temp. outlet °C 120/150
Design pressure barg 1.2 + liq.
Heat density for fired tubes kcal/h.cm2 < 580
Direct fired U tubes yes
Multi return tube no
Fired tube length m < 10
Fired tube dia. inches 24"
Fired tube wall thickness W. CA mm 10
Number of burner 2
Burners normal heat release MMkcal/h
Min./max. heat release MM kcal/h
Heat resistant cylinder in burner Yes
Flame detector type U.V./ion
Natural/forced draft burner natural
Chimney diameter inches
Chimney length m
Chimney insulation
Stripping column
Diameter m
Length m
Packing type PALL, SS
Packing height m 1.2
Material SS or 5 mm CA
Process evaluation Unit Recom'ded
value Vendor data Comment
Glycol preheater
Duty MMkcal/h
Temp. inlet/out reach glycol °C 45/150
Temp. inlet/out lean glycol °C 195/95
Manufacturer VICARB
Type COMPABLOC
Overdesign factor on surface % 25
Surface m2
Fouling factors
Rich/lean exchanger
Duty MMkcal/h
Temp. inlet/out reach glycol °C 45/150
Temp. inlet/out lean glycol °C 195/95
MANUFACTURER VICARB
Type COMPABLOC
Overdesign factor on surface % 25
Surface m2
Surge drum
Diameter x length m x m
Total volume m3
Design pressure barg > 2
Retention time min.
Volume for glycol from reboiler m3
Glycol circulation pumps
Flow rate m3/h
Type and number
Temperature °C < 90
NPSH R/A m
RPM
Stroke length
Static pulsation dampener:
• Type Static Yes
Process evaluation Unit Recom'ded
value Vendor data Comment
Final lean glycol cooler
Inlet temperature °C
Outlet temperature °C
Duty MMkcal/h
Area (bare tube) m2
Overdesign factor % 10
Material CS
Design pressure barg
Length x width m x m
Motor power kW
Glycol make-up facilities
Storage tank volume m3
Pump flow rate m3/h
Cartridge Filter yes
Closed drain
Drum: diameter and length Closed drain pump
Flow rate m3/h 15
Head bar 1
Motor power kW
Chemical injection package
Antifoam Yes
pH control Yes
Skid General Data
Glycol consumption (carry over + regen. loss) USG/MMSCF 0.03 Overall height m - Overall length m - Overall width m - Total weight t - CO2 snuffing system
Gas detection Ionisation
Fire detection IV/IR
Total or partial reproduction or utilisation of this document are forbidden without prior written authorization of the owner Folio: REV DATE Contract Number: ENGINEER DESCRIPTION BY PARTNERS Check APPR Exploration Production TOTAL 10/03PRE-PROJECT ISSUE IC ML 0
Total or partial reproduction or utilisation of this document are forbidden without prior written authorization of the owner Folio: REVDATE Contract Number: ENGINEER DESCRIPTION BY PARTNERS Check APPR Exploration Production TOTAL
DEHYDRATION COLUMN & GLYCOL FINAL COOLER
10/03PRE-PROJECT ISSUE IC ML 0
Total or partial reproduction or utilisation of this document are forbidden without prior written authorization of the owner Folio: REVDATE Contract Number: ENGINEER DESCRIPTION BY PARTNERS Check APPR Exploration Production TOTAL
GLYCOL REGENERATION SKID & LOW CAPACITY
10/03PRE-PROJECT ISSUE IC ML 0
Total or partial reproduction or utilisation of this document are forbidden without prior written authorization of the owner Folio: REV DATE Contract Number: ENGINEER DESCRIPTION BY PARTNERS Check APPR Exploration Production TOTAL
GLYCOL REGENERATION SKID & HIGH CAPACITY (FIRE TUBE REBOILER & EXTERNAL REFLUX CONDENSER)
10/03PRE-PROJECT ISSUE IC ML 0
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Explor ation Production TOTAL
GLYCOL REGENERATION SKID & HIGH CAPACITY ( EXTERNAL REFLUX CONDENSER)
TYPICAL PID
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FIGURE 9 – EQUILIBRIUM H2O DEWPOINT VERSUS TEMPERATURE AT VARIOUS
TEG CONCENTRATIONS (metric and english units) (From GPSA Engineering Data Book)