HDWRV Databook

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WRV

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2.1 General ... 2-1 2.2 Casings... 2-2 2.3 Rotors ... 2-3 2.4 Bearings... 2-4 2.5 Shaft Seals ... 2-5 2.6 Capacity Control ... 2-13 2.7 Variable Vi Control... 2-15 2.8 Standard Materials of Construction ... 2-20 2.9 Compressor Identification ... 2-21 2.10 Quality Assurance of WRV Compressors ... 2-23 2.11 API 619 Comments……… 2-24 3 TECHNICAL INFORMATION

3.1 Compressor Capacity and Design Limitations ... 3-1 3.2 Part Load Performance... 3-42 3.3 Compressor Weights ... 3-45 3.4 Compressor Rotor Inertias and Starting Torque... 3-46 3.5 Compressor Arrangement Drawings... 3-49 3.6 WRV Compressor Allowable Nozzle Loadings ... 3-50 3.7 Estimated Noise Levels ... 3-52 3.8 Typical P & I Diagram ... 3-58

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5 SUPERFEED SYSTEMS

5.1 Principle of the Howden Superfeed System ... 5-1 5.2 Application of Superfeed to Refrigeration ... 5-2 5.3 Detail Design Notes on Superfeed Applications ... 5-5 5.4 Superfeed System Options ... 5-7 6 COOLING SYSTEMS

6.1 Cooling System Options ... 6-1 6.2 External Oil Cooling ... 6-3 6.3 Cooling Using Liquid Refrigerant Injection... 6-4

7 CONTROL SYSTEM

7.1 Control Philosophy... 7-1 7.2 Two Stage Compression Systems... 7-2 7.3 Capacity Control ... 7-3

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February 2003 (iii) 8.5 Oil Tank/Separator... 8-5

8.6 Coalescing Oil Separators ... 8-18 8.7 Oil Heater... 8-22 8.8 Pressure Relief Valve ... 8-23 8.9 Compressor By-Pass ... 8-24 8.10 Oil Pump Suction ... 8-25 8.11 Oil Pump ... 8-26 8.12 Oil Cooler... 8-27 8.13 Oil Filter ... 8-28 8.14 Oil Manifold... 8-29 8.15 Instrumentation ... 8-30 8.16 Safety Trips... 8-31 8.17 Instrument Piping... 8-32 8.18 Driver Requirements... 8-33 9 SPECIAL INSTRUCTIONS FOR WRVT510 COMPRESSOR PACKAGING ... 9-1 10 COMPUTER SELECTION PROGRAM………. 10-1

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An extensive research development and testing program instituted by Howden Compressors Limited, ensures that the WRV compressor offers significant advantages in the following areas:

• Scope of Applications

Standard compressors and their model variations have demonstrated a proven history of successful operation in many applications. These include food freezing, cold storage, chilled water or glycol, turbine fuel gas boosting, landfill gas, natural gas wellhead, LNG terminal storage, offshore, hydrocarbon vapour recovery, cryogenic and many other critical process gas and industrial refrigeration applications.

• Refrigerants and Gases

WRV compressors are capable of operation with all CFC and HCFC refrigerants, anhydrous ammonia, HD-5 propane, helium, hydrogen, natural gas, CO2 and the majority of hydrocarbon gas mixtures.

• High Pressure Capability

WRV compressors are available in various casing materials to meet continuous operating pressures ratings up to:

Casing

Grey Iron: 24 bar g (348 psig) Nodular Iron: 32 bar g (464 psig) Steel : 36 bar g (522 psig)

NB: Compressors can be supplied at up to 45 bar g discharge pressure dependent on pressure ratio.

• American Petroleum Institute API 619

All compressors in the product line are available in cast steel casing material (WRVS) as a standard factory option to API 619 specification where appropriate.

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• Infinitely Variable Slide Flow and Vi Modulation

All compressors are equipped with a hydraulically actuated modulating slide valve (reduced full load volume ratio) resulting with optimum partial flow power consumption. Minimum gas turndown to 15% approaching 1.0 volume index (Vi) providing reduced starting torque profiles.

• Adjustable Full Load Volume Index

Adjustable Vi is in production on 255, 321 and 365 diameters. The adjustable Volume Index offers flexibility to apply the same model compressor in an expanded range of design suction pressures at optimum full load efficiency. • Economiser Side Port Vapour Injection (Super –Feed)

The super-feed port is radial fed into the female rotor at the optimised location to accommodate both sub-cooling flash loads and additional evaporator side loads in refrigeration applications for maximum energy efficiency ratio (EER).

• Natural Gas Engine Drive Capability

WRV Compressors rotate clockwise when facing compressor drive shaft allowing for conventional direct-coupled engine drives.

• New WRVi 365 Models

Operational data for the larger displacement WRVi 365 models is now included in this Data Book.

• Standard Factory Engineered Options

A range of “multiple” drive shaft seals can be engineered for each WRV compressor to eliminate/control flammable or toxic gas emissions in sever environments. Sour gas contruction features are available per specifications and/or duty requirements. Power take off (PTO) features can be custom engineered for specific needs.

• Proven Reliability

With over 20,000 units operational worldwide, the WRV compressor is renowned for its operational reliability and field service capability.

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36 - Built-in (fixed) volume ratio of the compressor i.e. 3.6

2) W - Wet, i.e. oil injected

R - Refrigeration or Natural Gas V - Volume, i.e. capacity control i - Variable volume ratio ie: 2.2 - 5.0 255 - Rotor diameter measured in mm. 193 - Rotor length to diameter ratio, ie:1.93

Because of the ability to apply WRV compressors over a wide variety of applications, many variations of the compressor are produced and theses are designated by different and extra letter codes. The above covers only the basic coding, a complete list of the identification codes is given in Section 2.8.

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February 2003 1-4 1.80 682 818 401 481 1.10 814 976 479 574 WRV 204 1.45 1097 1316 645 774 1.65 1221 1464 718 861 1.93 1343 1612 790 948 1.10 1590 1906 935 1121 1.30 1756 2108 1033 1240 WRVi 255 1.45 2157 2587 1269 1522 1.65 2400 2880 1412 1694 1.93 2635 3162 1550 1860 WRV255 2.20 3199 3839 1882 2258 1.32 3840 4607 2259 2710 WRVi 321 1.65 4799 5760 2823 3388 1.93 5272 6326 3101 3721 WRV 321 2.20 6399 7679 3764 4517 1.45 5868 7041 3453 4144 WRVi 365 1.65 6677 8012 3930 4716 1.93 7810 9372 4597 5516 1.32 7679 9214 4517 5420 WRVT 510 1.65 9598 11518 5646 6775 1.93 10540 12648 6200 7440 NOTES:

1. Displacements are based on a 2 pole electric motor drive directly coupled at 3000 (50 Hz) and 3600 rpm (60 Hz) respectively with the exception of the WRVT 510. The WRVT 510 displacement is based on a 4 pole electric motor drive directly coupled at 1500 and 1800 rpm. Swept volume displacement is proportional to drive speed.

2. Additional models are under development. Product specifications in this manual are subject to change without notice.

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oil and gas seals, the bearings are located close to the rotors. Therefore rotor deflections are kept to a minimum and high pressure differences across the compressor are possible. Only the power input shaft which is running at a comparatively low speed, has to be sealed to the atmosphere and a face type mechanical seal can be effectively employed for the majority of applications.

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A278 Grade 40B). The WRVT510 casings are manufactured from nodular (SG) iron to EN 1563-GJS-400-15.S (Comparable to ASTM A536 Grade 60/40/18).

Cast steel casings can be supplied to EN 10213-3 Grade G20 Mn5 (Comparable to ASTM A352 LCC) as an option to –30O_{C (-22} O_{). Low temperature certification is also} available as an option to -50 O_{C. (-58}O_{F). Optional cast steel materials are available to} down to -75 O_{C (-108}O_F).

All pressure containment casings are hydro statically pressure tested to a minimum of 42 bar gage (609 psig) prior to assembly. Casings are mated vertically with grooved O-Ring static seals. Gaskets are not permitted on casing splits.

SUCTION

FLANGE _{DOUBLE WALL} MAIN CASING

OUTLET END COVER

INLET END

COVER DISCHARGE _FLANGE

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diameter to give manimum energy efficiency ratio (EER) and co-efficient of performance (COP). The male and female rotors are dynamically balanced to ISO 1940 Grade 2.5. Standard rotor material is given in Section 2.7. For special applications rotors in other grades of steel can be supplied as an option.

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balance piston on both male and female rotors. Further off-loading of the male rotor thrust on some models is achieved by having another balance piston incorporated in the input shaft seal arrangement. This balance piston by itself, gives sufficient off-loading for the WRV163 compressor and no other balance pistons are fitted to this compressor. The WRVT510 compressor has tilting pad type thrust bearings as standard. This type of thrust bearing is available as an option on WRV(i)255 and WRV(i)321 compressors. If the compressed gas contains H2S1, copper free white metal bearings are available as an option to comply with NACE Standard.

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OUTLET END RADIAL BEARINGS

BALANCE PISTON

2.5 Shaft Seals 2.5.1 Standard Shaft Seal

Howden, in conjunction with a leading shaft seal manufacturer, has developed a balanced seal with a unique mounting and lubrication arrangement which ensures positive sealing and lubrication of the sealing seat with minimal carbon face oil seepage under all operating conditions. The life of the seal is extended considerably as a result of this design. The mechanical shaft seal cavity is flooded with oil as the buffer fluid. The mechanical shaft seal is mounted on the male drive rotor shaft at the suction end of the compressor and comprises a spring loaded carbon face rotating against a stationary cast iron seat.

The seal is easily replaced in-situ with a minimum of disturbance to other components.

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510MM 200 8.0 Note: Distance between Motor Drive Shaft and Compressor Shaft may vary due to customers’

coupling hubs being used.

Typical Shaft Seal Seepage Rates (Drops per Minute)

Compressor Rotor Diameter Before 200 hr Break-in After 200 hrs

163MM 3-10 0.5-2 204MM 4-12 0.5-3 255MM 5-15 1-4 321MM 6-18 2-5 365MM 6-18 2-5 510MM 6-18 2-5

Seal seapage rates are affected by shaft speed, coupling alignment, oil type and operating pressures. Above values are typical only.

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This is the lowest category “Secondary Containment Seal” where only the function of outboard seal is to contain medium/oil on emergency shut down.

Arrangement consists of Standard inner seal with T type outer seal which energises at approximately 0.5 bar G (7 PSIG) and deforms to act as a static seal.

Seal is expendable and must be replaced after emergency trip.

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The outer seal must not be subjected to pressures higher than 3 bar G (43 PSIG).

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PSIG)

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*1 CIRCULATING PUMP SELECTED FOR 1-2 bar (15-30 psi)

*2 OIL HEATER REQUIRED WHERE AMBIENT/INDOOR TEMPERATURE IS LOWER THAT 15C (60 F)

*3 LUBE OIL SKID REQUIRED

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at part load gives a related power saving.

Graph on following page shows a typical power/capacity curve for varying condensing conditions for a water chilling unit.

Table 3.2 in Section 3 shows the approximate absorbed power for different conditions of load when operating on Ammonia, Natural gas or CFC Refrigerants.

The capacity control slide valve is operated using an integral hydraulic cylinder and double acting piston.

To move the slide valve, oil from the lubrication system is fed, via solenoid valves, to one side or other of the piston which is connected to the slide valve. See Section 8 for connection details. HYDRAULIC CYLINDER Variable Vi Adjustment PISTON Slide

Valve CONNECTING _ROD

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with applications that require a wide range of compression ratio.

In refrigeration, full load Vi adjustments are not necessary at lower condensing temperatures if the compressor is unloaded to match the design capacity. If wide ranges of suction and discharge conditions are required at full load, the adjustable Vi offers peak efficiency.

For best full load efficiency, it is important that the degree of compression carried out between the rotor lobes closely matches that required by the compressor suction and discharge pressure conditions.

If the full load internal pressure just prior to discharge is greater than that required by the system, then over compression of the gas in the discharge port would occur significantly reducing the efficiency of the compressor. If the full load internal pressure just prior to discharge is less than required, the gas discharges with some effect on power consumption. Consult the compressor selection program for quantative analysis.

Theoretically, maximum full load efficiency is achieved when the compression ration within the compressor matches the ratio of the suction and discharge pressures.

This may be expressed as:

Vi

∝

= Pco Where Vi = inlet volume. Vo Pev Vo = outlet volume. Pco = condensing pressure.

)

(

Pev = evaporating pressure.

∝

= Cp/Cv is the adiabatic gas index.

In practice the efficiency of the compressor is also effected by other factors. The most efficient Vi may differ slightly from the theoretically calculated value.

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p.v. diagrams of internal compression 2.7.1 (Cont'd)

Certain models in the WRV compressor range are fitted with a variable volume ratio (Vi) control. Provision of this facility allows the optimum Vi to be selected for the evaporating and condenser conditions. Adjustment can be made in the range Vi = 2.2 to Vi = 5.0.

This adjustment of the Vi is advantageous in refrigeration where there is a significant change in the full load operating conditions. This may occur where night temperatures vary significantly from those during the day or changing seasons, and the additional full load compressor capacity at lower condensing is utilises. This is typical with multiple compressor installations where one compressor off loads via slide valve and the balance of compressors are maintained at 100% capacity. It is suggested that the daily mean condensing temperature be used as the basis for the setting. Re-adjustment of the Vi setting can be carried out at any time (See Section 2.6.2).

The most significant power cost savings are achieved through unloading the compressor (Vi reduces at part load) when additional refrigeration capacity is not required. Full load performance may be optimised with changes in mean condensing conditions due to seasonal temperature changes and trends.

This adjustment of the Vi is advantageous in natural gas well-head gas pumping when the equipment is designed over a wide range of full load suction pressures. This provides for maximum flexibility to move the equipment to other well-head locations.

The control over this adjustment can be carried out by turning the adjuster to move the stop along the rotor length to obtain the optimum matched position

The control over this adjustment can be carried out by turning the adjuster to move the stop along the rotor length to obtain the optimum matched position.

Vi Adjustment

It is recommended that the computer selection program be used to produce a table or curve showing the most advantageous Vi setting for the range of operating conditions likely to be encountered by the user. This information should be provided to the operators by the contractor taking account of the requirements for each particular application.

To obtain this information, values for the operating conditions may be entered into the selection program which then calculates the best Vi setting taking account of all the variables within the compressor.

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Vi Adjusting Screw

stationary.

The number of turns of the actuating screw to set the required Vi are shown on Pages 2-12, & 2-13, for the various compressor sizes.

EXAMPLE 1

It is required to set a WRVi 255/165 at a Vi of 3.6

From the WRVi 255/165 Graph on Page 2-15 - the number of turns required is 8.8 STEP 1 Ensure slide valve is fully unloaded

STEP 2 Rotate actuating screw clockwise until it locks at low Vi position (2.2 in this case)

STEP 3 Turn actuating screw 8.8 turns anti-clockwise. The Vi of 3.6 is now set.

EXAMPLE 2

It is required to set a WRVi 321/193 at a Vi of 5.0

From the WRVi 321/193 Graph on Page 2-16 - the number of turns required is 24.5 STEP 1 Ensure slide valve is fully unloaded.

STEP 2 Rotate actuating screw clockwise until it locks at low Vi position. STEP 3 Turn actuating screw 24.5 turns anti-clockwise.

The Vi of 5.0 is now set.

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(321 & 365) (510)

STEEL TO EN10250 – 2 GRADE C40 ¡AISI 1040

STEEL TO EN 10250 – 2 GRADE C55 ¡AISI 1055

HOUSINGS ETC STEEL BAR TO BS 970 080 M40 ¡AISI 1040

COVER PLATES ETC STEEL PLATE TO EN 10283-2 GRADE P265GH

¡AISI 1055

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M Stands for Mirror image which is an oil injected compressor in which the direction of rotation is reversed in order to permit double ended drive. This is an alternative to W. R Stands for Refrigeration and is used to identify the compressors designed for

handling refrigerants and gases, with fully sealed and hydraulically tested casings. C Stands for Conditioning and identifies a version of the standard refrigeration

compressor which has no oil injection holes in the slide valve. It is used for some compressors operating on dense gases such as R12 and R22, propane etc. where the reduced oil quantity supplied to the compressor does not result in excessive discharge temperatures. The first use of this type was for air conditioning applications hence the use of this letter.

The letter C is an alternative to R and the letters cannot be used together.

L Stands for Light gases and identifies a version of the standard refrigeration compressor which has modified clearances and adjustments for compressors handling very light gases such as hydrogen and helium. The reduced clearances are necessary to give an acceptable performance.

The letter L is an alternative to R and the letters cannot be used together.

V Stands for Volume control and indicates that an integral controlling slide valve of some sort is fitted to the compressor.

B Stands for Booster and applies to compressors which have a reduced pressure capability due to long rotor length, type of bearings used, or other limitations.

H Stands for Higher pressure and applies to refrigeration/gas compressors which have an increased pressure capability due to modified thrust balance piston area, increased oil pressure supply, or other enhancements. The oil pressure of this standard increases from a nominal 30 psi (2 bar) to a nominal 40 psi (2.75 bar) differential pressure. This variant is suitable for discharge pressures up to 350 psig (24 bar g) on long rotor lengths and higher with shorter rotor lengths.

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compressor has SG iron casings as standard for all variants. H and X, are alternatives and can never be used together.

T Stands for Tilting pad thrust bearings which were introduced to enable the compressors to comply with API 619.

(Note: The 510 compressor has tilting pad thrust bearings as standard). Discharge pressure limits are the same as for the WRVH compressors.

The coding letters for Gas/Refrigeration compressors described above are always used in the order given, W or M precedes R, C or L which precedes V etc.

S Stands for Steel casings. While the letter means steel casings, it does not specify what steel is used, which can vary depending on application.

N Stands for Nodular cast iron and applies to compressors with nodular cast iron casings. This code letter is positioned as the S for Steel casings. As the WRVT 510 compressor is manufactured in this material as standard, the letter N is not used for its identification.

i Stands for infinitely variable volume ratio that can be set between 2.2 and 5.0. This means that the volume ratio can be easily adjusted to suit compressor operating conditions.

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The Glasgow facility is the headquarters for design and production of screw compressors serving a wide variety of applications, including the compression of natural gas, hydrocarbon systems, refrigerants and chemical process gases. Site installation and commissioning is not carried out by Howden. Customer Support is available to offer advice as required. Packaging and delivery of product is provided by approved suppliers and packagers worldwide.

Howden Compressors Limited enjoys the patronage of many prestigious customers and recognises that for this situation to continue, the Company must focus on responding to customer needs in developing our products and continually improving our systems. As such, Howden Compressors design and manufacturing systems and control procedures are fully accredited as complying with ISO 9001, 2000 and a series of ongoing internal and external audits are rigorously applied to ensure that these standards are maintained.

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February 2003 2-24

4.3.5 Standard Compressor does not fully comply as some connections on smaller compressor sizes have connections of 3/4 inch or less.

4.3.5.5 Unless stub pipes are agreed then this clause is excluded.

4.4.1 Standard Compressors comply with ISO standard for screw compressors and may not necessarily comply with Appendix - G.

4.5.1.2 Standard rotors use shaft integral with rotor body but not necessarily forgings. (Steel Bar ≤255mm diameter steel forging >255mm diameter)

4.5.1.3 We have not incorporated radial vibration probe sensing area. (Axial probe sensing area is provided).

4.7.1 A Torsional or Torsional Plus Lateral Analysis is available as an option for the complete shaft system. It is not carried out within the compressor due to the oil damping effects throughout the compressor and it is impracticable to attempt model analysis within the compressor by adding imbalance.

4.7.3.5 Non contacting radial vibration probes are not used in the oil injected, stiff shaft, slow speed screw compressor.

4.8.4.4* When sleeve bearing type drive motors are used, coupling type must eliminate applied thrust load to the compressor.

4.10.2* A lubrication system shall be furnished with each compressor to meet all the requirements of the compressor itself, but it cannot be used to supply external items of the equipment due to the inherent characteristics of the system necessary for this type of compressor.

4.10.3 API Standard 614 cannot be used in its entirety with this type of compressor. API 614 calls for a non-pressured lubrication tank vented to atmosphere whereas in an oil injected screw compressor of the type being considered the oil tank is maintained at compressor discharge pressure at all times and is a totally sealed system within the compressor package. Those requirements of API 614 which can be incorporated into a system, for example use of stainless steel oil piping after the oil filter, duplex components etc. are available as an option.

4.12 Nameplates to this standard available as material agreed with Purchaser.

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Min. Tip Speed m/s Max. Tip Speed m/s

12.8 38.5

12.8 38.5 Theoretical Volume (Range) cfm

Theoretical Volume (Range) m³/h

161-484 274-823

156-468 265-795 Built-in Volume Ratio Vi

Max. Pressure Difference psi

bar

Max. Inlet Pressure psig

barg 2.1 188 13 87 6 2.6 203 14 75 5 3.6 236 16.3 50 3.5 5.0 260 18 30 2 5.8 270 18.7 25 1.7 Max. Outlet Pressure psig

barg

Min. Inlet Temperature °F

°C Max. Inlet Temperature °F

°C Max. Outlet Temperature °F

°C 260 18 -76 -60 122 50 212 100 Hydraulic Test Pressure psig

barg

600 42 Max. Power (at max. speed) hp

kW

Max. Allowable Torque lb.ft (at Male Rotor) Nm

470 350 550 746 Direction of rotation of male

rotor looking from drive unit _CLOCKWISE

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Max. Tip Speed m/s 38.5 38.5 Theoretical Volume (Range) cfm

161-484 274-823

bar

barg 2.1 230 16 100 7 2.6 260 18 80 5.5 3.6 309 21.3 50 3.5 5.0 340 23.5 30 2 5.8 350 24.2 25 1.7 Max. Outlet Pressure psig

barg

°C 350 24.1 -76 -60 122 50 212 100 Hydraulic Test Pressure psig

barg

kW

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200-601 341-1022

bar

barg

kW

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200-601 341-1022

bar

barg

kW

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239-718 406-1219

bar

barg

kW

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239-718 406-1219

bar

barg

kW

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322-967 548-1643

bar

barg

kW

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322-967 548-1643

bar

barg

kW

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359-1076 610-1829

bar

barg

kW

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359-1076 610-1829

bar

barg

kW

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395-1185 671-2013

bar

barg

kW

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395-1185 671-2013

bar

barg

kW

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467-1121 794-1905

447-1072 759-1821 Volume Ratio Vi

bar

barg 2.2 192 13.2 84 5.8 2.6 203 14 75 5 3.6 236 16.3 50 3.5 5.0 260 18 30 2 5.8 Fixed 270 18.7 25 1.7 Max. Outlet Pressure psig

barg

kW

rotor looking from drive unit CLOCKWISE

Vi is variable from 2.2 to 5.0. Intermediate points are included to display pressure limits. 5.8 Vi is non-variable.

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467-1121 794-1905

447-1072 759-1821 Volume Ratio Vi

bar

barg 2.2 236 16.3 96 6.6 2.6 260 18 80 5.5 3.6 309 21.3 50 3.5 5.0 340 23.5 35 2 5.8 350 24.2 25 1.7 Max. Outlet Pressure psig

barg

kW

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517-1240 878-2106

504-1211 857-2057 Volume Ratio Vi

bar

barg 2.2 192 13.2 84 5.8 2.6 203 14 75 5 3.6 236 16.3 50 3.5 5.0 260 18 30 2 5.8 270 18.7 25 1.7 Max. Outlet Pressure psig

barg

kW

Vi is variable from 2.2 to 5.0. Intermediate points are included to display pressure limits. 5.8Vi is non-variable.

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517-1240 878-2106

504-1211 857-2057 Volume Ratio Vi

bar

barg

kW

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634-1522 1078-2586

609-1462 1035-2484 Volume Ratio Vi

bar

barg

kW

Vi isvariable from 2.2 to 5.0. Intermediate points are included to display pressure limits. 5.8 Vi is non-variable.

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634-1522 1078-2586

609-1462 1035-2484 Volume Ratio Vi

bar

barg

kW

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706-1694 1199-2878

685-1644 1164-2793 Volume Ratio Vi

bar

barg

kW

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706-1694 1199-2878

685-1644 1164-2793 Volume Ratio Vi

bar

barg

kW

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775-1860 1317-3160

764-1833 1298-3114 Volume Ratio Vi

bar

barg

kW

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775-1860 1317-3160

764-1833 1298-3114 Volume Ratio Vi

bar

barg

kW

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941-2258 1599-3837

bar

barg 2.1 140 9.7 65 4.5 2.6 157 10.8 55 3.8 3.6 181 12.5 40 2.8 5.0 200 14 30 2.0 5.8 210 14.5 25 1.7 Max. Outlet Pressure psig

barg

kW

Built-in volume ratio is fixed at full load for 2.20 L/D

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Max. Tip Speed m/s 47.1 Theoretical Volume (Range) cfm 941-2258

1599-3837

922-2212 1566-3759 Built-in Volume Ratio (Fixed) Vi

bar barg 2.1 68 4.7 65 4 2.6 83 50 3.5 3.6 105 7.2 40 2.8 5.0 8.5 30 2.0 5.8 132 9.1 25 1.7 Max. Outlet Pressure psig

barg

°C

47.1 Theoretical Volume (Range) m³/h

123 5.7

Max. Outlet Temperature °F

barg

kW

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1129-2710 1919-4605

1086-2606 1845-4428 Volume Ratio Vi

bar

barg

kW

Vi is variable from 2.2 to 5.0. Intermediate points are included to display presssure limits. 5.8 Vi is non-variable.

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1129-2710 1919-4605

1086-2606 1845-4428 Volume Ratio Vi

bar

barg

kW

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1412-3388 2398-5756

1369-3285 2326-5581 Volume Ratio Vi

bar

barg

kW

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1412-3388 2398-5756

1369-3285 2326-5581 Volume Ratio Vi

bar

barg

kW

Vi is variable from 2.2 to 5.0. Intermediate points are included to displaypressure limits. 5.8 Vi is non-variable.

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1550-3721 2634-6321

1525-3661 2592-6220 Volume Ratio Vi

bar

barg

kW

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1550-3721 2634-6321

1525-3661 2592-6220 Volume Ratio Vi

bar

barg

kW

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1882-4517 3198-7675

bar

barg 2.1 140 9.7 60 4 2.6 157 10.8 50 3.5 3.6 181 12.5 40 2.8 5.0 200 14 30 2.0 5.8 210 14.5 25 1.7 Max. Outlet Pressure psig

barg

kW

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1882-4517 3198-7675

bar

barg 2.1 68 4.7 60 4 2.6 83 5.7 50 3.5 3.6 105 7.2 40 2.8 5.0 123 8.5 30 2.0 5.8 132 9.1 25 1.7 Max. Outlet Pressure psig

barg

kW

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1727-4144 2934-7041

1727-4144 2934-7041 Volume Ratio Vi

bar

barg

kW

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1727-4144 2934-7041

1727-4144 2934-7041 Volume Ratio Vi

bar

barg

kW

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Min. Tip Speed m/s Max. Tip Speed m/s

28.6 68.8

28.6 68.8 Theoretical Volume (Range) cfm

1991-4716 3383-8012

1991-4716 3383-8012 Volume Ratio Vi

bar

barg

kW

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1991-4716 3353-8012

1991-4716 3383-8012 Volume Ratio Vi

bar

barg

kW

Vi is variable from 2.2 to 5.0. Intermediate points are included to display pressure limits.

5.8 Vi is non-variable.

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2300-5516 3905-9372

2300-5516 3905-9372 Volume Ratio Vi

bar

barg

kW

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2300-5516 3905-9372

2300-5516 3905-9372 Volume Ratio Vi

bar

barg

kW

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Theoretical Volume (Range) cfm Theoretical Volume (Range) m³/h

2108-6022 3581-10231

To Contract Built-in Volume Ratio Vi

bar

barg 2.1 230 16 87 6 2.6 264 18.2 75 5 3.6 305 21 50 3.4 5.0 336 23.2 31 2.1 5.8 348 24.0 25 1.7 Max. Outlet Pressure psig

barg

kW

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2635-7528 4479-12789

To Contract Built-in Volume Ratio (Fixed) Vi

bar

barg

kW

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2893-8266 4916-14044

To Contract Built-in Volume Ratio (Fixed) Vi

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90 93 94 95 93 94 95 80 84 86 89 85 87 89 70 75 78 82 77 80 83 60 66 71 75 70 73 78 50 59 64 69 63 68 72 40 52 59 64 56 62 68 30 46 54 60 50 58 64 20 40 51 57 45 55 61 10 36 48 55 40 53 59

NOTE 1: V.R. = Volume Ratio.

NOTE 2: The above applies at constant condensing temperature. A considerable reduction in part load power occurs if the condensing temperature reduces under part load.

NOTE 3: The above percentages will increase slightly at higher Pressure Ratios (PR) than those assumed above, i.e. for VR = 2.6: PR = 3, for VR = 3.6: PR = 5, for VR = 5.0: PR = 7.

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NOTE: CONDENSING TEMPERATURE VARYING FROM 95°F TO 75°F BETWEEN 100% AND 10% CAPACITY

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NOTE: CONDENSING TEMPERATURE VARYING FROM 95°F TO 75°F BETWEEN 100% AND 10% CAPACITY

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WRV204 1.45 840 1850 1.65 855 1885 1.93 900 1985 1.10 1150 2535 1.30 1205 2655 WRVi255 1.45 1270 2800 1.65 1340 2955 1.93 1405 3095 WRV255 2.20 1585 3495 1.32 2800 6170 WRVi321 1.65 3020 6655 1.93 3105 6845 WRV321 2.20 3610 7955 1.45 4940 10890 WRVi365 1.65 5150 11355 1.93 5430 11970 1.32 10800 23810 WRVT510 1.65 11500 25353 1.93 11800 26014 February 2003 3-45