1、Designation:F168500(Reapproved 2013)An American National StandardStandard Specification forPressure-Reducing Manifolds for Air or Nitrogen Systems1This standard is issued under the fixed designation F1685;the number immediately following the designation indicates the year oforiginal adoption or,in t
2、he case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the design,construction,test-ing and operating requirements for p
3、ressure-reducing mani-folds for air or nitrogen systems,referred to herein also asmanifolds.The term manifold constitutes the combination ofall components and piping between,and including,the inletand outlet ports(see Fig.1 and Fig.2).1.2 The values stated in inch-pound units are to be regardedas th
4、e standard.The values given in parentheses(metric SIunits)are for information only.2.Referenced Documents2.1 ASTM Standards:2F992 Specification for Valve Label PlatesF1508 Specification for Angle Style,Pressure Relief Valvesfor Steam,Gas,and Liquid ServicesF1795 Specification for Pressure-Reducing V
5、alves for Air orNitrogen Systems2.2 American Society of Mechanical Engineers(ASME):B1.1 UnifiedScrew Threads32.3 Military Standards and Specifications:MIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment(Type IEnvironmental and Type II Inter-nally Excited)4MIL-STD-740 Airborne and Structureborn
6、e Noise Measure-ments and Acceptance Criteria of Shipboard Equipment4MS 16142 Boss,Gasket Seal Straight Thread Tube Fitting,Standard Dimensions for4MIL-S-901 Shock Tests,H.I.(High-Impact);ShipboardMachinery,Equipment and Systems,Requirements for4MIL-F-1183 Fittings,Pipe,Cast Bronze,Silver-Brazing,Ge
7、neral Specification for42.4 Government Drawings:Naval Sea Systems Command(NAVSEA):NAVSEA 803-1385884 Unions,Fittings and Adapters Buttand Socket Welding 6000 PSI,WOG and OXY(IPS)4NAVSEA 803-1385943 Unions,Silver Brazing 3000 PSI,WOG,IPS,for UT Inspection4NAVSEA 803-1385946 Unions,Bronze,Silver Brazi
8、ng,WOG for UT Inspection,1500 PSI,WOG43.Terminology3.1 Definitions:3.1.1 accuracy of regulationthe amount by which thedownstream pressure may vary when the manifold is set at anypressure within the required set pressure range and is subjectedto any combination of inlet pressure,flow demand,andambien
9、t temperature variations within the specified limits.3.1.2 bubble-tightNo visible leakage over a 5-min periodusing either water submersion or the application of bubble fluidfor detection.3.1.3 external leakageLeakage from the manifold whichescapes to atmosphere.3.1.4 flow rate demandthe amount of fl
10、ow demanded atany given time by the system downstream of the manifold.3.1.5 flow rate demand rangethe range over which theflow demand can vary.3.1.6 hydrostatic shell test pressuresthe hydrostatic testpressures that the inlet and outlet sections of the manifold arerequired to withstand without damag
11、e.Manifold operation isnot required during application of shell test pressure,but themanifold must meet all performance requirements after theshell test pressure has been removed.3.1.7 inlet operating pressure rangethe range over whichthe inlet pressure supplied to the manifold can vary under anyope
12、rational conditions which the manifold can be subjected toin service.3.1.8 internal leakageleakage from higher pressure tolower pressure portions of the manifold and which does notescape to atmosphere.3.1.9 manifold rated pressuresthe inlet and outlet pressureratings of the manifold.These rated pres
13、sures are selected from1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is under the direct responsibility of SubcommitteeF25.11 on Machinery and Piping Systems.Current edition approved May 1,2013.Published May 2013.Originallyapproved in 1996.Last
14、 previous edition approved in 2006 as F1685 00(2006).DOI:10.1520/F1685-00R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe AS
15、TM website.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990.4Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.Copyright ASTM International,100
16、 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the applicable pressure ratings(see 4.2)and specified in theordering information(see Section 5).The inlet pressure ratingis applicable from the manifold inlet up to and including theseats of the outlet stop valve and bypass throttle valve.Theoutlet pressure rating is applicable from the outlet side of theseats of the outlet stop valve to the manifold outlet and thebypass throttle valve to the manifold outlet.3.1.10 man
