1、Designation: F 1685 00 (Reapproved 2006)An American National StandardStandard Specification forPressure-Reducing Manifolds for Air or Nitrogen Systems1This standard is issued under the fixed designation F 1685; the number immediately following the designation indicates the year oforiginal adoption o
2、r, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the design, construction, test-ing and operating re
3、quirements for pressure-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
4、are to be regardedas the standard. The values given in parentheses (metric SIunits) are for information only.2. Referenced Documents2.1 ASTM Standards:2F 992 Specification for Valve Label PlatesF 1508 Specification forAngle Style, Pressure ReliefValvesfor Steam, Gas, and Liquid ServicesF 1795 Specif
5、ication for Pressure-Reducing Valves for Airor Nitrogen 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-S
6、TD-740 Airborne and Structureborne Noise Mea-surements and Acceptance Criteria of Shipboard Equip-ment4MS 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 Fit
7、tings, Pipe, Cast Bronze, Silver-Brazing,General 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 Inspec
8、tion4NAVSEA 803-1385946 Unions, Bronze, Silver Brazing,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
9、any combination of inlet pressure, flow demand, andambient 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 whichesc
10、apes to atmosphere.3.1.4 flow rate demandthe amount of flow 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 sectio
11、ns 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 rangethe range over whichthe in
12、let pressure supplied to the manifold can vary under anyoperational 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
13、and outlet pres-sure ratings of the manifold. These rated pressures are selectedfrom the applicable pressure ratings (see 4.2) and specified inthe ordering information (see Section 5). The inlet pressure1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology
14、 and is under the direct responsibility of SubcommitteeF25.11 on Machinery and Piping Systems.Current edition approved May 1, 2006. Published May 2006. Originallyapproved in 1996. Last previous edition approved in 2000 as F 1685 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org
15、, orcontact ASTM Customer Service at serviceastm.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, Three Park Ave., New York, NY 10
16、016-5990.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.rating is applicable from the manifold inlet
17、up to and includingthe seats 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 manual valvesthese are all the manually
18、 operatedvalves in the manifold which include handwheel-operatedvalves and wrench-operated valves. The handwheel-operatedvalves are the inlet and outlet stop valves, and the bypassthrottle valve. The wrench-operated valves are the upstreamand downstream bleed valves and the gage isolation valve. The
19、requirements for any manually operated valves installed in thepressure-reducing valve are covered under 6.5.1.3.1.11 maximum flow rate demandthe maximum amountof flow demanded of the manifold by the downstream system.3.1.12 maximum inlet operating pressurethe highest pres-sure supplied to the inlet
20、of the manifold in service.3.1.13 maximum outlet operating pressurethe highestpressure at the manifold outlet in service. This is established bythe accumulation pressure of the pressure-relief valve.3.1.14 maximum set pressurethe highest set pressure atwhich the manifold can meet the performance req
21、uirementsspecified.3.1.15 minimum flow rate demandthe minimum flow ratedemanded of the manifold by the downstream system.3.1.16 minimum inlet operating pressurethe lowest pres-sure supplied to the inlet of the manifold in service.3.1.17 minimum outlet operating pressurethe lowest pres-sure at the ma
22、nifold outlet in service. This is established by theaccuracy of regulation of the pressure-reducing valve.3.1.18 minimum set pressurethe lowest set pressure atwhich the manifold can meet the performance requirementsspecified.3.1.19 operating pressuresthe pressures within the mani-fold during service
23、.3.1.20 pressure-reducing valvethe component of themanifold which accomplishes automatic regulation of thedownstream pressure. In this component, the upstream pressureis reduced to the desired downstream pressure.FIG. 1 Manifold ConfigurationFIG. 2 Manifold ConfigurationF 1685 00 (2006)23.1.21 press
24、ure-relief valvethe component of the mani-fold which protects the manifold and downstream systemsagainst downstream over pressurization.3.1.22 set pressurethe outlet pressure delivered by themanifold at the time the pressure setting is made. For thepurposes of this specification, it will be assumed
25、that thesetting is made when there is no flow demand on the manifold(“lock-up” condition), and the manifold is at surroundingambient temperature.3.1.23 set pressure rangethe range of set pressures overwhich the manifold can be adjusted while meeting the perfor-mance requirements specified.3.1.24 wid
26、e open capacitythe flow rate when a valve is ina position which presents the least resistance to flow.4. Classification4.1 ConfigurationManifolds shall be of the followingconfigurations and specified in the ordering information (see5.1).Configuration 1-1 One reducer, one relief (see Fig. 1).Configur
27、ation 2-1 Two reducers, one relief (see Fig. 2).4.2 Pressure RatingsManifolds shall have inlet-ratedpressures and outlet-rated pressures selected from the follow-ing categories: 400-, 1500-, 3000-, and 6000-psig (2.8-, 10.3-,20.7-, and 41.4-MPa gage pressure). The inlet and outletpressure ratings se
28、lected shall be specified in Section 5.4.3 End ConnectionsManifolds shall have inlet and outletend connections selected from those listed in Table 1 andspecified in Section 5.5. Ordering Information5.1 Ordering documentation for manifolds under this speci-fication shall include the following informa
29、tion, as required, todescribe the equipment adequately:5.1.1 ASTM designation and year of issue,5.1.2 Size and type of inlet end connection (see 4.3 and6.4.2),5.1.3 Size and type of outlet end connection (see 4.3 and6.4.2),5.1.4 Size and type of end connections for pressure-reducing valve and pressu
30、re-relief valve,5.1.5 If tail pieces and union nuts are required (whenrequired, their material of construction shall be per Table 1),5.1.6 Manifold configuration, inlet and outlet pressure rat-ings (see 4.1 and 4.2),5.1.7 Manifold inlet operating pressure range,5.1.8 Type of mounting required: botto
31、m or back mounting(see 6.4.3),5.1.9 Set pressure and set pressure range, if other thanspecified (see 7.3),5.1.10 Flow rate demand range (see 7.1, S1.1.6),5.1.11 Accuracy of regulation required, if other than speci-fied, or if set pressure is below 10 psig (see 7.2),5.1.12 Relief valve set pressure a
32、nd accumulation pressure(if different from Specification F 1508),5.1.13 Ambient atmospheric conditions: temperature range,chemical contaminants, if any,5.1.14 Quality of inlet air/nitrogen gas: temperature range,moisture content, oil/lubricant contaminants, if any,5.1.15 Special tools required (see
33、6.7),5.1.16 Tamper-proof lead seal if required (see SpecificationF 1795, Section 5),5.1.17 Supplementary requirements, if any (S1 through S4),and5.1.18 Maximum vibration frequency, if other than specified(see S1.1.9).6. Manifold Construction6.1 Manifolds shall incorporate the design features specifi
34、edin 6.2-6.11.6.2 Materials of ConstructionMaterial requirements forthe assemblies in the manifold shall be as specified in theapplicable component specifications referenced herein. Mate-rials for all other parts, including the inlet and outlet manifoldblocks, shall be 300 series corrosion-resistant
35、 steel (SS304,304L, 316, or 316L) or other materials selected to provideweldability and corrosion resistance without requiring paint-ing, coating, or plating. The inlet and outlet manifold blocksshall be weld repairable. Materials for contacting parts shall beselected to minimize electrolytic corros
36、ion and galling. Metal-lic materials shall conform to applicable ASTM specifications.Nonmetallic materials shall be compatible with the line me-dium.6.3 General RequirementsManifolds shall incorporate thefunctional elements shown schematically in Fig. 1 or Fig. 2,asapplicable, and delineated below:(
37、1) Inlet and outlet stop valves,(2) Upstream and downstream bleed valves (for depressur-ization of all components and fluid cavities.),(3) Pressure-reducing valve(s),(4) Pressure-relief valve,(5) Gauge isolation valve, and(6) Bypass throttle valve.All components shall be part of a manifold assembly,
38、 as shownin Fig. 3 or Fig. 4, as applicable, which requires only one inletand one outlet connection to the main flow path of the pipingsystem in which it is installed. The inlet and outlet connectionsshall be in-line. The manifold shall be fabricated from inlet andoutlet blocks, with interconnecting
39、 piping for the pressure-reducing valve(s) and bypass throttle valve flow paths. Themanual valves shall be cartridge mounted into the inlet andoutlet manifold blocks as shown in Fig. 3 or Fig. 4,asTABLE 1 Manifold Inlet and Outlet End ConnectionsType of End Connection Pressure Rating,lb/in2(MPa)Appl
40、icableDocumentsUnionA, silver-brazed 400 (2.8) MIL-F-1183 (O-ring type)UnionA, silver-brazed 1500 (10.3) 803-1385946UnionA, silver-brazed 3000 (20.5) 803-1385943UnionA, butt/socketweld6000 (41.4) 803-1385884As specified As specified As specifiedAOnly the pertinent dimensions listed in the applicable
41、 documents applicable tothe straight thread portion of the thread piece shall apply. Thread pieces shall besecured to the manifold inlet and outlet blocks using straight threads and a O-ringseal design. For the manifold inlet and outlet connections, unless otherwisespecified in Section 5 the tail pi
42、eces and the union nuts shall not be furnishedonly the thread pieces shall be furnished. If tail pieces and union nuts are required,their materials of construction shall be in accordance with the applicable docu-ments listed above and shall be specified in Section 5.F 1685 00 (2006)3NOTE 1Pictorial
43、representations are for illustrative purposes only and do not imply design.FIG. 3 Components of a Manifold AssemblyFIG. 4 Components of Manifold AssemblyF 1685 00 (2006)4applicable. The pressure-reducing valve and the pressure-reliefvalve shall be mounted by way of takedown connections inaccordance
44、with Table 1. The manifold shall be capable ofmeeting all requirements of this specification and provideextended reliable operation when protected by a 5-m nominal/18-m absolute filter installed upstream of the manifold inletand when subjected to conditions specified in Section 5.6.4 Design Construc
45、tion Requirements6.4.1 Pressure EnvelopeThe hydrostatic shell test pres-sures shall be 1.5 times the manifold rated inlet and outletpressures.6.4.2 ConnectionsThe main-line inlet and outlet connec-tions of the manifold, the inlet and outlet connections of thepressure-reducing valve(s), the connectio
46、ns for the bypass line,and the inlet and outlet connection to the pressure-relief valveshall be takedown joints (unions or other as specified) asspecified in Table 1 based on rated pressures specified. Anyexposed threads shall be protected by plastic caps for shipping.The main-line inlet and outlet
47、connection of the manifold andthe inlet and outlet connection for the pressure-reducingvalve(s) shall permit axial adjustment to expedite properinstallation of the manifold into the piping system and tofacilitate replacement of the pressure-reducing valve(s) withone of another make or model or which
48、 is for some otherreason not dimensionally identical to the originally installedpressure-reducing valve(s). The axial adjustment feature forthe pressure-reducing valve(s) shall be included in that portionof the takedown joints that are connected to the inlet and outletmanifold blocks. If unions per
49、Table 1 are specified for thepressure-reducing valve(s) inlet and outlet connections, thethread pieces shall be the portions of the unions that areattached to the pressure-reducing valve(s). The range overwhich each of the four adjustable connections noted above canbe adjusted shall be as specified in Table 2. A positive andpermanent means shall be incorporated to ensure that none ofthe four adjustable connections can be backed out beyond theirminimum engagement position. The size of the main-line inletand outlet connections of the manifold sh
