thiết kế đường ống quanh bơm

BECHTEL CORPORATION ENGINEERING – PLANT DESIGN DESIGN GUIDE PUMP PIPING 3DG-P22-00003, Revision 001, 2002 June 14 Reason for Issue: Issued for Use – Prepared by: B.Tarr Checked by: P.R.Wood Approved by: R Fox INTRODUCTION This design guide is focused on the design of piping for various types of pumps that are most commonly used across multiple GBUs The Plant Design and Piping group is responsible for developing a comprehensive, safe and well thought-out design that includes meeting codes, manufacturer and/or client requirements for nozzle loads on the pump and stress allowables for the piping system Support of the piping system must be given careful consideration during the layout of the piping This is a joint effort of the piping designer and the pipe stress/pipe support engineer Proper design of the piping will allow good access to the pump for operation and maintenance Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 Contains confidential and/or proprietary information to Bechtel and its affiliated companies which shall not be used, disclosed or reproduced in any format by any non-Bechtel party without Bechtel’s prior written permission All rights reserved 3DG-P22-00003-001 Page of 20 TABLE OF CONTENTS PAGE INTRODUCTION LIST OF FIGURES …………………………………………………………………………………… 1.0 PURPOSE 2.0 EXCLUSIONS 3.0 DISCUSSION 3.1 SAFETY 3.2 OPERATION 3.3 MAINTENANCE 4.0 TYPES OF PUMPS 5.0 PUMP LOCATION 6.0 GENERAL PUMP PIPING 6.1 REDUCER TYPE AND LOCATION 6.2 VALVE LOCATION AND ORIENTATION 11 6.3 HORIZONTAL DISCHARGE OFFSET 12 6.4 TEMPORARY AND PERMANENT SUCTION STRAINER INSTALLATION 12 7.0 CENTRIFUGAL PUMP PIPING LAYOUT 16 7.1 HORIZONTAL CENTRIFUGAL PUMPS 16 7.2 VERTICAL CENTRIFUGAL PUMP PIPING 19 8.0 RECIPROCATING PUMP PIPING 20 9.0 ROTARY PUMP PIPING 20 Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 10.0 PUMPS OPERATING BELOW ATMOSPHERIC PRESSURE 20 11.0 AUXILIARY PIPING 21 12.0 FIELD WELDS 22 13.0 STEAM TURBINE PIPING 23 14.0 SUPPORT OF PUMP PIPING 24 15.0 DIFFERENTIAL SETTLEMENT 25 16.0 REFERENCES 25 Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 LIST OF FIGURES PAGE Figure Common Centrifugal Pumps Figure Reducers at Pumps 11 Figure Typical Pump Discharge Piping 12 Figure Typical Piping for End Suction – Top Discharge Pumps (API Pumps Only) 14 Figure Typ Piping for End Suct - Top Disch Pumps (Non-API Pumps Only) 15 Figure Piping for Pumps with a Common Spare 16 Figure Typ Arrangement for End/Top Suct Centrifugal Pumps 18 Figure Piping Arrangement for Side Suction Pumps 19 Figure Typical Pump Suction Piping at Vacuum Tower 21 Figure 10 Preferred Auxiliary Piping Arrangement and access zones 22 Figure 11 Typical Steam Turbine Piping 23 Figure 12 Pump Discharge Piping Support Options 24 Figure 13 Pump Suction Support for Differential Settlement Problem 25 Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 1.0 PURPOSE To provide the layout designer guidelines for developing pump piping designs that fully consider safety, operation, maintenance and economics 2.0 EXCLUSIONS All or part of this guide may be superseded by client mandatory standards or by the codes and regulations imposed by governmental jurisdictions covering the location where the piping is installed 3.0 DISCUSSION 3.1 SAFETY Proper consideration for personnel safety around pumps requires piping and valve arrangements that not obstruct access for operation, maintenance or egress Care must be exercised not to create tripping hazards with auxiliary piping 3.2 OPERATION Pumps normally require minimal attention during operation Valves however, must be located for easy access; this is particularly true for paired or spared pumps Where manual valves cannot be operated from grade, chain operators shall be used If chain operators are not allowed per client specifications, platform access to valves shall be considered 3.3 MAINTENANCE Piping shall be arranged in a manner to allow adequate access to the pump without requiring excessive dismantling of the piping system The coupling between the pump and its driver must be easily accessed in order to align the pump and driver Pump seal access must also be considered Piping must be kept clear from above the pump for horizontally split pump casings to allow maintenance For vertically split casings, access must be provided in front of the pumps Clearance for forklifts or mobile cranes should be provided for maintenance In cases where pumps are located in a building or other areas where overhead access is limited, monorails or rigging beams should be considered for removal of the pump and/or motor 4.0 TYPES OF PUMPS Pumps are available in many different types The most common are centrifugal, reciprocating and rotary Reciprocating and rotary pumps are positive displacement pumps Centrifugal pumps will usually be one of three types; horizontal, vertical in-line or vertical can type They may have electric motor or steam turbine drivers (See Figure for examples of horizontal, vertical in-line and vertical can type centrifugal pumps) Reciprocating pumps may have a direct steam piston driver Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 Rotary pumps usually have an electric motor driver but may be steam turbine driven In many cases, the fluid pumped by rotary pumps is so viscous that block valves are not necessary In that case, the relief valve may not be necessary If turbine driven, there will be a gearbox between the pump and turbine Figure Common Centrifugal Pumps Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 5.0 PUMP LOCATION Pump location will affect the piping layout and how the piping can be supported Pumps in flammable service shall be located outboard of overhead piperacks or structures Those in nonflammable service may be located beneath the piperack (subject to allowance in client specifications) Pumps shall be located as close as possible to the source of suction in order to minimize pressure drop in the system while satisfying piping flexibility requirements and nozzle load allowables Line size and temperature should be determining factors in routing the piping 6.0 GENERAL PUMP PIPING Pump suction piping shall be arranged such that the flow is as smooth and uniform as practicable at the pump suction nozzle To accomplish this, the use of tees, crosses, valves, strainers, near run-size branch connections, and short radius elbows shall be avoided near the suction nozzle Suction piping shall be designed without high points to prevent collection of vapors Suction piping shall not be pocketed When pump flanges are flat faced, mating flanges must also be flat faced and the joint made up using full-faced gaskets Multiple pump arrangements that connect to a common discharge header shall have the discharges connected to the header such that the discharges from pumps operating simultaneously not oppose one another The suction line for all systems designed to API recommendations that connect to API pumps with end, top or side suction nozzles, or API in-line pumps, shall have a straight run of five pipe diameters (nozzle size) between the suction flange and the first elbow, tee, valve, reducer or permanent strainer (Figure 4) The suction line for pumps other than API, shall have a minimum straight run length of three pipe diameters This straight run length should be maximized, but in any case the pump manufacturers recommendations should be followed (Figure 5) 6.1 REDUCER TYPE AND LOCATION Eccentric reducers in horizontal pump suction lines shall be flat on top in order to prevent any entrained vapors in the liquid from accumulating in the high point and possibly causing cavitation in the pump Pumps in boiler feed water service operating at close to the vapor pressure of the liquid are particularly susceptible to this problem The reducer shall be concentric for overhead piping into a top suction pump (See Figure 2) Reducers in pump discharge lines shall be concentric and located as close as possible to the pump discharge nozzle In cases where a combination of nozzle size, nozzle location, pipe size and insulation thickness create flange to pipe/insulation interference, eccentric reducers may be used to gain the required clearance Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 Care should be exercised when using a top flat reducer next to a pump suction nozzle where the change in diameters exceeds 4in / 100mm, as this could result in a disturbed flow pattern into the impeller and cause vibration and rapid wear Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page of 20 Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 10 of 20 SUCTION DISCHARGE BLOCK VALVE (SEE PARAGRAPH 3.2) CONCENTRIC REDUCER (SEE PARAGRAPH 6.1) FOR STRAIGHT RUN REQUIREMENTS, SEE PARAGRAPH 6.0 CONCENTRIC REDUCER C PUMP DISCHARGE SUCTION CONCENTRIC REDUCER FOR STRAIGHT RUN REQUIREMENTS SEE PARAGRAPH 6.0 DRAIN REQUIRED WHEN SUCTION IS FROM ABOVE ECCENTRIC REDUCER (FLAT ON TOP) REDUCERS AT PUMPS Figure 6.2 Figure Reducers at Pumps VALVE LOCATION AND ORIENTATION Valve handwheels shall be oriented in a manner resulting in good access to the valve and pump The suction line valve shall be installed with the stem in the horizontal (i.e install valve in the vertical run of pipe) Gate valves installed in the horizontal can accumulate vapor in the bonnet cavity and cause cavitation in the pump when the trapped vapor breaks loose Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 11 of 20 6.3 HORIZONTAL DISCHARGE OFFSET If existing steel is not available for support of the discharge piping, or if the check valve must be installed in a horizontal run, then Alternate in Figure shall be used When discharge piping is horizontally offset, care must be exercised not to block access to the pump coupling, seals or bearings (See figures & 12) Figure 6.4 Typical Pump Discharge Piping TEMPORARY AND PERMANENT SUCTION STRAINER INSTALLATION Special attention must be given to the location of temporary suction strainers to allow for removal Figures & show examples of suction strainer installation For permanent T-type and Y-type strainers installed in a horizontal suction line, the preferred position of the clean-out connection is 30 to 40 degrees from the vertical making sure that there is enough clearance for strainer removal at grade Consideration shall be given to the handling of large “T” type strainer covers, and a permanent handling device (e.g a davit) supplied if access by mobile equipment is not possible Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 12 of 20 Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 13 of 20 DISCHARGE BLOCK VALVE SUCTION CHECK VALVE BLOCK VALVE NO TE PI 5x N z oz D ia CONCENTRIC REDUCER PUMP CASING PERMANENT STRAINER TEMPORARY STRAINER (W HEN SPECIFIED) BREAK FLANGES FOR TEMP STRAINER BASE SUPPORT ECCENTRIC REDUCER (FLAT ON TOP) NOTE USE TAPPED CHECK VALVE ONLY WHEN PERMITTED BY CLIENT SPECIFICATIONS OTHERWISE USE A SPOOLPIECE WITH BLEED VALVE BETW EEN CHECK AND BLOCK VALVES TYPICAL PIPING FOR END SUCTION - TOP DISCHARGE PUMPS (API PUMPS ONLY) FIGURE Figure Typical Piping for End Suction – Top Discharge Pumps (API Pumps Only) Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 14 of 20 DISCHARGE BLOCK VALVE SUCTION CHECK VALVE BLOCK VALVE NO TE PI P 3x ipe ) in m ( Dia CONCENTRIC REDUCER PUMP CASING ECCENTRIC REDUCER (FLAT ON TOP) PERMANENT STRAINER (WHEN SPECIFIED) BREAK FLANGES FOR TEMP STRAINER BASE SUPPORT TEMPORARY STRAINER NOTE USE TAPPED CHECK VALVE ONLY WHEN PERMITTED BY CLIENT SPECIFICATIONS OTHERWISE USE A SPOOLPIECE WITH BLEED VALVE BETWEEN CHECK AND BLOCK VALVES TYPICAL PIPING FOR END SUCTION - TOP DISCHARGE PUMPS (NON API PUMPS ONLY) FIGURE Figure Typ Piping for End Suct - Top Disch Pumps (Non-API Pumps Only) Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 15 of 20 6.5 COMMON SPARE Occasionally, one pump is installed as a common spare between two other pumps in different services The pump must be manifolded in such a way that accomplishes this Figure illustrates an arrangement commonly used Figure Piping for Pumps with a Common Spare 7.0 CENTRIFUGAL PUMP PIPING LAYOUT 7.1 HORIZONTAL CENTRIFUGAL PUMPS Horizontal centrifugal pumps usually fit into three categories: (1) End Suction -Top Discharge Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 16 of 20 (2) (3) Top Suction -Top Discharge Side Suction -Side Discharge The most common are end suction or top suction Suction piping shall be supported at grade below the elbow for end suction pumps The discharge line (top discharge) shall be supported from overhead steel whenever possible to allow as much free area as possible around the pump for operation/maintenance Figure illustrates how piping may be designed for these pumps TOP SUCTION PUMPS MAY REQUIRE ADDED STEEL FOR SUPPORT ALTERNATE ROUTING FOR HOT SUCTION LINE FOR PIPING BELOW 11'-0" (3300mm) KEEP AREA DIRECTLY OVER PUMP CLEAR PIPING DIRECTLY ABOVE PUMP IS ACCEPTABLE OVER 11'-0" (3300mm) ABOVE GRADE FOR HOT DISCHARGE PIPING, ROUTE LINE BELOW SUPPORT AND USE A SPRING HANGER TYPICAL ARRANGEMENT FOR END/TOP SUCTION CENTRIFUGAL PUMPS Figure Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 17 of 20 Figure Typ Arrangement for End/Top Suct Centrifugal Pumps 7.1.1 Typical End Suction Top Discharge arrangement Figures & show common piping arrangements for end suction - top discharge centrifugal pumps The suction line shall have a straight run between the suction nozzle and the first elbow, tee, valve, reducer or permanent strainer as dictated by the type of pump and/or manufacturers recommendation 7.1.2 Side Suction / Side Discharge Pump Piping Pumps may be single stage or multi-stage Multi-stage pumps are usually side suction - side discharge These pumps require significantly more space, and present special layout considerations The pump suction line for side suction pumps shall have a minimum straight run of three pipe diameters (for non-API pumps) or five pipe diameters (for API pumps) between the suction flange and the first elbow, tee, valve, reducer and permanent strainer If a horizontal suction line cannot be avoided, then the straight run length should be five diameters minimum for all pumps (Figure 8) Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 18 of 20 CENTRIFUGAL PUMP VERTICAL SUCTION LINE (PREFERRED) FROM ABOVE OR BELOW FOR STRAIGHT RUN REQUIREMENTS, SEE PARA 7.1.2 HORIZONTAL SUCTION LINE C PUMP C PUMP MAINTENANCE ACCESS AREA C PIPE RACK COLS C PUMPS CONVENTIONAL SIDE BY SIDE ALTERNATIVE END TO END PIPING ARRANGEMENT FOR SIDE SUCTION - SIDE DISCHARGE PUMPS FIGURE Figure Piping Arrangement for Side Suction Pumps 7.2 VERTICAL CENTRIFUGAL PUMP PIPING Vertical centrifugal pumps may be in-line, can (self contained) or sump pumps In-line pumps are mounted in the line and supported by the piping as the name implies A pedestal is often required for larger in-line pumps or where the load is too high for the nozzles to handle The designer must consider access for maintenance and operation in the same way as for horizontal pumps Vertical can type pumps are installed in a concrete cylinder but the process fluid is completely contained in the pump "can." They are used when there is a high NPSH requirement or at surface condensers This allows the surface condenser to be mounted at a lower elevation The same is true for a vessel connected to a vertical can pump The primary concern for the designer is to provide adequate overhead clearance to remove the pump for maintenance Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 19 of 20 Vertical sump pumps are usually used to pump waste products or water from a collection sump Here again a primary concern is to provide adequate overhead clearance to remove the pump for maintenance The clearance requirements, between the sump walls or bottom and the pump’s inlet nozzle as well as the pump’s length must be given careful consideration during the layout phase of the project The sump design at the pump intake shall be based on Hydraulic Institute Standards 8.0 RECIPROCATING PUMP PIPING Reciprocating pumps are used when high head is required These pumps require a pressure relief valve (PRV) to be installed between the pump and the discharge block valve The PRV can be external, in the piping, or integral with the pump casing Due to the pulsating action of reciprocating pumps, the designer must consider space requirements for pulsation dampeners These are usually furnished with the pump but take up additional space Pump access is even more important for reciprocating pumps since they require more maintenance than other pumps Do not install any bend (i.e 90 degree elbow) directly adjacent to the pump discharge For typical egress and clearance requirements, refer to Design Guide for Compressor Piping Layout (Reciprocating Compressors) 3DG-P22-00008 The discharge pulsation dampener must be installed as close to the discharge as possible Pipe supports must be given special consideration due to the pulsations 9.0 ROTARY PUMP PIPING Rotary pumps are used for very heavy or viscous fluids They deliver a constant pulsation-free flow Piping for these pumps is very similar to that of centrifugal pumps but is usually characterized by the absence of block valves in the suction and discharge piping If block valves are used, a pressure relief valve must be installed between the pump discharge and the block valve The PRV discharge is usually routed back to the pump suction 10.0 PUMPS OPERATING BELOW ATMOSPHERIC PRESSURE Pumps operating below atmospheric pressure (e.g Vacuum Tower Bottoms Pumps) present special problems Since the system operates at a negative pressure and very high temperature, the pumps must be located very close to the suction source This is often directly below the tower or immediately outside the tower support columns Pumps located directly beneath the tower can be mounted on a special spring base as shown in Figure Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 20 of 20 Figure 11.0 Typical Pump Suction Piping at Vacuum Tower AUXILIARY PIPING Consideration must be given to lube oil and seal oil systems and any cooling water requirements Care must be exercised not to block access to the pump seals, bearings, seal pots, starter button stations and motor conduit connection when routing these lines (Figure 10) The pump data sheet shall always be reviewed to make sure these requirements are not missed For very large pumps these may be on separate skids Firewater deluge piping shall be routed so that it does not interfere with pump operating or maintenance access If the deluge piping design is sub-contracted, the vendor’s design should be checked to ensure that safety egress, operating and maintenance accessways are maintained Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 21 of 20 F Figure 10 12.0 Preferred Auxiliary Piping Arrangement and access zones FIELD WELDS Consideration should be given to the placement of field fit-up welds in shop fabricated piping 2½” and larger Early in the project, Plant Design should review the options with Construction and the decision documented Options include: (i) Tack weld the flange adjacent to the pump suction and discharge nozzles to permit piping installation in accordance with the machinery flange fit-up requirements (ii) Provide field welds that allow fit-up in three directions (iii) No field welds other than those required by spool transportation size limitations Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 22 of 20 13.0 STEAM TURBINE PIPING Piping at steam turbines present somewhat different considerations from that of pumps The piping must be designed to prevent the possibility of introducing a slug of condensate into the turbine, which could destroy the turbine vanes The inlet piping must have the block valve or control valve installed in the horizontal run with a drip leg and steam trap upstream of the valves whether the turbine is set-up for manual or automatic operation In cases where the throttling valve is furnished with the turbine and located on the inlet nozzle, the drip leg and steam trap shall be located immediately upstream (See figure 11) Reducers installed in the inlet piping to steam turbines shall be eccentric with the flat side on the bottom to prevent the accumulation of any liquid OPEN END TO ATMOSPHERE STEAM EXHAUST STEAM SUPPLY BLOCK VALVE STEAM TRAP CONTROL VALVE BLOCK VALVE (NOTE 1) RELIEF VALVE DRIP LEG NOTE FOR FREEZING CLIMATES, LOCATE BLOCK VALVE AT HIGH POINT OF BRANCH LINE TYPICAL STEAM TURBINE PIPING FIGURE 11 Figure 11 Typical Steam Turbine Piping Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 23 of 20 14.0 SUPPORT OF PUMP PIPING It is preferred that pump discharge piping be supported from overhead steel whenever possible This allows piping at the pump to be removed for maintenance (See figure 12) The piping layout must permit both suction and discharge pipes to be supported independent of the pump(s), such that very little load is transmitted to the pump casing Figure 12 Pump Discharge Piping Support Options Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 24 of 20 15.0 DIFFERENTIAL SETTLEMENT When differential settlement is a problem, it is preferred that the pump suction piping be supported from the pump foundation This can be accomplished by extending the foundation as shown in Figure 13 Figure 13 16.0 Pump Suction Support for Differential Settlement Problem REFERENCES Hydraulic Institute Standards Pump Handbook (ISBN 0-07-033301-7) Design Guide for Gas Compressor Piping (Reciprocating Compressors) 3DG-P22-00008 Electronic documents, once printed, are uncontrolled and may become outdated Refer to the electronic documents in BecRef for current revisions Bechtel Confidential © Bechtel Corporation 1993, 2002 All rights reserved 3DG-P22-00003-001 Engineering Design Guide – Pump Piping Page 25 of 20