UL SUBJECT 1247A-2017 OUTLINE OF INVESTIGATION FOR VARIABLE SPEED LIMITING CONTROLS INSTALLED WITH DIESEL ENGINES FOR DRIVING STATIONARY FIRE PUMPS (Issue 3).pdf
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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULApril 28, 20171UL 1247AOUTLINE OF INVESTIGATION FOR VARIABLE SPEED LIMITINGCONTROLS INSTALLED WITH DIESEL ENGINES FOR DRIVINGSTATIONARY FIRE PUMPSIssue No. 3April 28, 2017Summary of TopicsThis th
2、ird issue of Subject 1247A, Outline of Investigation for VariableSpeed Limiting Controls Installed With Diesel Engines for DrivingStationary Fire Pumps covers the construction and performancerequirements for a variable speed pressure limiting control (VSPLC) andvariable speed suction limiting contro
3、l (VSSLC) intended to be installedon a diesel engine for driving a stationary fire pump at the enginemanufacturing location. The minimum set pressure for a VSPLCreferenced in 6.17 has been reduced to 90 psig from 100 psig to providefor slightly lower pressures to be discharged into underground pipin
4、gwhich can have a pressure rating as low as 100 psig.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthos
5、e Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPYRIGHT 2017 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAPRIL 28, 2017UL 1247A2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHE
6、R REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTS1 Scope .42 Components 43 Units of Measurement .44 Undated References 55 Glossary .56 Variable Speed Limiting Controls .57 Performance Tests 77.1 VSPLC Performance rating 77.2 VSSLC Performance test 87.3 Engine endurance at lowest opera
7、ting speed 87.4 VSPLC Operation test 97.5 VSSLC Operation test 97.6 Pressure Transducer (Sensor) Tests .107.7 Hydrostatic strength .127.8 Elastomeric parts (except gaskets) test 137.9 Cycling test .137.10 Contaminated water cycle test .147.11 Stress-corrosion cracking of brass parts test .147.12 Str
8、ess-corrosion cracking of stainless steel parts test .157.13 Deposit loading test 167.14 10-day corrosion test .168 Variable Speed Limiting Control Production Tests 179 Marking .18APRIL 28, 2017 UL 1247A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSI
9、ON FROM UL1 Scope1.1 These requirements cover the construction and performance requirements for a variable speedpressure limiting control (VSPLC) and variable speed suction limiting control (VSSLC) intended to beinstalled on a diesel engine for driving a stationary fire pump at the engine manufactur
10、ing location. Inaddition to complying with the requirements described herein, the engine with VSPLC or VSSLC shallcomply with the applicable requirements of the Standard for Diesel Engines for Driving Stationary FirePumps, UL 1247.1.2 The engines covered by these requirements are intended for instal
11、lation and use in accordance withthe Standard for the Installation of Stationary Fire Pumps for Fire Protection, NFPA 20.2 Components2.1 Except as indicated in 2.2, a component of a product covered by this Outline of Investigation shallcomply with the requirements for that component.2.2 A component
12、is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this Outline of Investigation, orb) Is superseded by a requirement in this Outline of Investigation.2.3 A component shall be us
13、ed in accordance with its rating established for the intended conditions ofuse.2.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding speci
14、fied limits, and shall be used only under those specific conditions.3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.APRIL 28, 2017UL 1247A4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION
15、ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this Outline ofInvestigation shall be interpreted as referring to the latest edition of that code or standard.5 Glossary5.1 For the purpose of this outline of
16、 investigation, the following definitions apply.5.2 CORROSION-RESISTANT MATERIAL A material having resistance to corrosion equivalent to orexceeding that of a brass, bronze, monel, or series 300 stainless steel alloy.5.3 RATED PRESSURE The maximum working pressure intended for the device.5.4 SET PRE
17、SSURE The internal pressure at which a variable speed limiting control device isintended to begin to decrease engine speed.5.5 SYSTEM PRESSURE The pressure that is measured on the discharge side of the fire pump (theresult of the suction supply pressure, pump curve and engine speed droop) at any flo
18、w condition.5.6 VARIABLE SPEED PRESSURE LIMITING CONTROL (VSPLC) A factory installed engineattachment intended to limit system pressure by reducing the pump driver speed from rated speed.Where referenced in this standard, the VSPLC device is the primary variable speed control device thatis connected
19、 to the engine throttle or electronically controls the engine throttle.5.7 VARIABLE SPEED SUCTION LIMITING CONTROL (VSSLC) A factory installed engineattachment intended to maintain a minimum positive suction pressure by reducing the pump driverspeed from rated speed. Where referenced in this standar
20、d, the VSSLC device is the primary variablespeed control device that is connected to the engine throttle or electronically controls the engine throttle.6 Variable Speed Limiting Controls6.1 A VSPLC shall not decrease engine speed unless system pressure exceeds the set pressure.6.2 A VSSLC shall not
21、decrease engine speed unless the suction pressure drops below the set pressure.6.3 A VSPLC shall not increase engine speed above the rated speed for the purpose of increasingsystem pressure.6.4 A mechanical VSPLC or VSSLC shall be factory preset, and provided with a means such as afastening nut to s
22、ecure the intended setting and a tamper indicator such as a seal.6.5 An electronic VSPLC or VSSLC shall be factory preset and shall not be field programmable.6.6 A VSPLC or VSSLC shall be provided with a stop having a tamper indicator or other feature that willnot permit the engine to be operated at
23、 a speed below the lowest operating speed permitted by the enginemanufacturer.APRIL 28, 2017 UL 1247A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.7 A VSPLC or VSSLC device shall be constructed for use at a rated pressure of at least 175
24、 psig (1.21Mpa).6.8 A part that bears against, rotates within, or slides on stationary parts, and that must be free to moveduring operation, shall be made of compatible corrosion-resistant material, or shall be fitted with bushings,inserts, or other parts made of these corrosion-resistant materials
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