Mechanical design of mounded bullet shall be carried out considering combination of various loads.
3.3.1 Loading
Because of critical relationship between the foundation and vessel design,construction of sand-bed / foundation and settlement shall be strictly monitored during various stages of construction, vessel hydrotest etc. Following loading shall be considered for design:
a) Operating Condition:
Self weight of vessel (but corroded thickness), mound load, foundation/ sand-bed reaction, liquid weight, earthquake loading, differential settlement, design pressure, longitudinal frictional load due to thermal and pressure expansion, explosion pressure on mound (if specified).
b) Hydro Test Condition
Self weight of vessel, mound load (in case of health check-up),foundation / sand-bed reaction, water weight, differential settlement, test pressure, longitudinal frictional load due to thermal and pressure expansion.
3.3.2 Stress Analysis
CLIENT : INDIAN OIL CORPORATION LIMITED – MATHURA REFINERY.
UNIT : FCC UNIT.
PROJECT : FCCU AND PRU REVAMP, MATHURA.
The present document or drawing is property of TECHNIP KT INDIA LTD. and shall not, under any circumstances, be totally or partially, directly or indirectly, transferred, reproduced, copied, disclosed or used, without its prior written consent, for any purpose and in any way other than that for which it is specifically furnished or outside the extent of the agreed upon right of use.
Detail stress analysis shall be carried out by using finite Element Method, Stiffness matrix method or any other relevant structural mechanics approach. Used software must be properly validated giving references of similar installations for which the package has been used.
3.3.3 Cathodic Protection
Sacrificial anode cathodic protection system shall be designed and installed.
3.3.4 Mound Load
a) Weight of mound shall be calculated for saturated mound and specific gravity of mound shall be taken not less than 2.0 for this purpose. Load of mound on a vessel shall be calculated with arching effect.
b) Mound depth above top of the vessel shall not be less than 1 metre.
3.3.5 Load due to Uneven Settlement
a) To make allowance in the design for effect of tolerances in alignment of shell section, unevenness in sand-bed, etc. a maximum/minimum reaction may be assumed as given below.
b) Based on soil investigation along with vessel axis, sub grade modules of soil / bed shall be calculated. Value of Pmax/Pmin may be reduced to 1.30 provided foundation is constructed and differential settlement is ensured by the contractor and demonstrated during hydrotest.
c) Sand-bed should be properly prepared and compacted to obtain effective angle of support at least 120 and differential settlement should not be more than 40 mm between mid-point of vessel and
CLIENT : INDIAN OIL CORPORATION LIMITED – MATHURA REFINERY.
UNIT : FCC UNIT.
PROJECT : FCCU AND PRU REVAMP, MATHURA.
The present document or drawing is property of TECHNIP KT INDIA LTD. and shall not, under any circumstances, be totally or partially, directly or indirectly, transferred, reproduced, copied, disclosed or used, without its prior written consent, for any purpose and in any way other than that for which it is specifically furnished or outside the extent of the agreed upon right of use.
end-point of vessel.
d) During initial hydrotest condition sand bed contact angle may be taken as 60 without mound over vessel if such condition arise during construction and hydrotesting of vessel.
3.3.6 Corrosion Protection
Suitable surface treatment ( blast cleaned to SA 2 ½ surface finish) with Polyurethane / Poly- Urea coating shall be provided over mounded bullet for corrosion protection.
List of applicators / vendor for Polyurethane / Poly-Urea coating are as under;
1) M/s Amchem Products Pvt. Ltd
A-79 Sector 58,Phase-III, Noida -201301 Product Name : Purethane.
2) M/s Polybrid Coating, USA
Exclusive Licensee M/s. Univest Chemical Pvt Ltd.,Mumbai Product Name : Polybrid 705
3) M/s Vasu Chemicals, Vasu Centre, Military Road, Marol, Andheri (E), Mumbai
Product Name : Protegol 100% solid Elastometric Pu Coating from Goldschmidt TIB GmbH
4) M/s Cipy Polyurethane coatings, Bhoisari , MIDC, Pune Product Name : Durathane 100EA
The vendor should be given the job as supply and apply basis with necessary guarantees. The vendor shall submit the completion / performance certificate for the job done in the past 5 years.
The vendor shall have the necessary application equipment like plural component airless spray equipment and blast cleaning equipment and all suitable inspection instruments.
3.3.7 100% radiography and 100% SR of all pressure part joints on the vessel to be ensured irrespective of thickness as per OISD std. 144 and 150.
3.4 HEAT EXCHANGERS
3.4.1 Mechanical design of heat exchangers shall be done by software which complies with TEMA &
ASME Sec. VIII Division 1.
3.4.2 The following mechanical design criteria shall be adhered to during design and engineering of
CLIENT : INDIAN OIL CORPORATION LIMITED – MATHURA REFINERY.
UNIT : FCC UNIT.
PROJECT : FCCU AND PRU REVAMP, MATHURA.
The present document or drawing is property of TECHNIP KT INDIA LTD. and shall not, under any circumstances, be totally or partially, directly or indirectly, transferred, reproduced, copied, disclosed or used, without its prior written consent, for any purpose and in any way other than that for which it is specifically furnished or outside the extent of the agreed upon right of use.
heat exchangers:
i) Metric bolting shall be used except for nozzles.
ii) Bolt loads shall be considered for designing the flange.
iii) Main girth flange shall be of forged (hubbed) construction.
iv) Bundle interchangeability shall be considered (in the same unit only) to the extent possible.
v) Eye bolts for pulling out of removable bundles shall be provided at both stationary and floating tube sheets.
vi) Exchangers shall be designed for full vacuum when partial/full vacuum is specified in data sheet.
3.5 AIR COOLERS
3.5.1 The following mechanical design criteria shall be adhered to during design and engineering of Air Coolers:
i) Metric bolting shall be used except for nozzles.
ii) Header shall have plate construction.
iii) All nozzle flanges shall be of welding neck forged construction.
CLIENT : INDIAN OIL CORPORATION LIMITED – MATHURA REFINERY.
UNIT : FCC UNIT.
PROJECT : FCCU AND PRU REVAMP, MATHURA.
The present document or drawing is property of TECHNIP KT INDIA LTD. and shall not, under any circumstances, be totally or partially, directly or indirectly, transferred, reproduced, copied, disclosed or used, without its prior written consent, for any purpose and in any way other than that for which it is specifically furnished or outside the extent of the agreed upon right of use.
TABLE-I
DETAILS AND WEIGHT OF COLUMN ATTACHMENT
1. Shape factor for shell (for wind force calculation) : 0.7
2. Weight of trays (with liquid) to be considered. : 120 Kg./m2.
3. Weight of plain Ladder : 15 Kg./m
4. Weight of caged ladder : 37 Kg./m
5. Equivalent projection to be considered
for wind load on caged ladder : 300 mm
6. Distance of platform below each manhole : Approx. 1000 mm
7. Maximum distance between consecutive platforms : 5000 mm
8. Projection of Platform : 900 mm upto 1 meter dia.
column and 1200 mm for column dia. >1 meter, from column insulation surface.
9. i) Equivalent height of platform
(for wind load computation) : 1000 mm
ii) Shape Factor for platform : 1.0
10. Weight of platforms : 170 Kg./m2.
11. Platform shall be considered all around for top & bottom platforms. All intermediate platforms
CLIENT : INDIAN OIL CORPORATION LIMITED – MATHURA REFINERY.
UNIT : FCC UNIT.
PROJECT : FCCU AND PRU REVAMP, MATHURA.
The present document or drawing is property of TECHNIP KT INDIA LTD. and shall not, under any circumstances, be totally or partially, directly or indirectly, transferred, reproduced, copied, disclosed or used, without its prior written consent, for any purpose and in any way other than that for which it is specifically furnished or outside the extent of the agreed upon right of use.
shall be taken as minimum half and platform shall be made available for all nozzle approach including instrument tappings.
12. Supply and fabrication of structure and gratings for platforms, hand railings, toe guard, monkey ladder shall be in the scope of supply of equipment supplier. Structure & gratings for platform shall be hot dip galvanized. Hand railings, toe guard, monkey ladder shall be supplied with one coat of primer as per painting specification. Assembly of these items shall be carried out by site installation agency.
CLIENT : INDIAN OIL CORPORATION LIMITED – MATHURA REFINERY.
UNIT : FCC UNIT.
PROJECT : FCCU AND PRU REVAMP, MATHURA.
The present document or drawing is property of TECHNIP KT INDIA LTD. and shall not, under any circumstances, be totally or partially, directly or indirectly, transferred, reproduced, copied, disclosed or used, without its prior written consent, for any purpose and in any way other than that for which it is specifically furnished or outside the extent of the agreed upon right of use.
SECTION-B
(TRAY & TOWER INTERNALS)
1.0 INTENT
1.1 The intent of this specification is to define basis to be followed for Mechanical Design,
engineering, fabrication, inspection/testing, supply and installation (inside the columns at site) of Trays, Packed Column Internals and Tower Packings separately and collectively known as "Internals". For licensed units, in case the requirements specified here are in conflict with licensor’s specifications, licensor’s requirements shall govern.
1.2 In case of any conflict between various documents, resolution shall be in accordance with the following order of preference:
• Data Sheets/P&ID’s/Design Basis
• Job Specifications
• Standard Specifications/Engineering Standards.