1、Designation:F168500(Reapproved 2019)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 st
4、andard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision
5、 on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2F992 Specification for Valve Label PlatesF1508 Specification for Angle Style,Pressure Rel
6、ief Valvesfor Steam,Gas,and Liquid ServicesF1795 Specification for Pressure-Reducing Valves for Air orNitrogen Systems2.2 ASME Standard:3B1.1 Unified Inch Screw Threads2.3 Military Standards and Specifications:4MIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment(Type IEnvironmental and Type II
7、 Inter-nally Excited)MIL-STD-740 Airborne and Structureborne Noise Measure-ments and Acceptance Criteria of Shipboard EquipmentMS 16142 Boss,Gasket Seal Straight Thread Tube Fitting,Standard Dimensions forMIL-S-901 Shock Tests,H.I.(High-Impact);ShipboardMachinery,Equipment and Systems,Requirements f
8、orMIL-F-1183 Fittings,Pipe,Cast Bronze,Silver-Brazing,General Specification for2.4 Government Drawings:4Naval Sea Systems Command(NAVSEA):NAVSEA 803-1385884 Unions,Fittings and Adapters Buttand Socket Welding 6000 PSI,WOG and OXY(IPS)NAVSEA 803-1385943 Unions,Silver Brazing 3000 PSI,WOG,IPS,for UT I
9、nspectionNAVSEA 803-1385946 Unions,Bronze,Silver Brazing,WOG for UT Inspection,1500 PSI,WOG3.Terminology3.1 Definitions:3.1.1 accuracy of regulation,nthe amount by which thedownstream pressure may vary when the manifold is set at anypressure within the required set pressure range and is subjectedto
10、any combination of inlet pressure,flow demand,andambient temperature variations within the specified limits.3.1.2 bubble-tight,nno visible leakage over a 5-minperiod using either water submersion or the application ofbubble fluid for detection.3.1.3 external leakage,nleakage from the manifold whiche
11、scapes to atmosphere.3.1.4 flow rate demand,nthe amount of flow demanded atany given time by the system downstream of the manifold.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is under the direct responsibility of SubcommitteeF25.11 on Machine
12、ry and Piping Systems.Current edition approved May 1,2019.Published June 2019.Originallyapproved in 1996.Last previous edition approved in 2013 as F1685 00(2013).DOI:10.1520/F1685-00R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.
13、org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,New York,NY 10016-5990,http:/www.asme.org.4Available from DLA Document S
14、ervices,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on
15、 standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.5 flow rate demand range,nthe range over which theflow demand can vary.3.1.6 hydr
16、ostatic shell test pressures,nthe hydrostatic testpressures that the inlet and outlet sections of the manifold arerequired to withstand without damage.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 range,nthe range overwhich the inlet pressure supplied to the manifold can varyunder any operational conditions which the manifold can besubj
