1、Designation: F721 81 (Reapproved 2014)F721 18 An American National StandardStandard Specification forGage Piping Assemblies1This standard is issued under the fixed designation F721; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, t
2、he year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specification covers
3、 details of gage piping assemblies for pressure gages with optional provisions for additional gages,pressure switches, transmitters, and so forth, for use with steam, steam drains, feed water, condensate, fresh water, salt water,compressed air, fuel oil, and lubricating oil systems.1.2 The values st
4、ated in inch-pound units are to be regarded as the standard. The values given in parentheses are for informationonly. mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This international standard was developed in accordance with internati
5、onally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A105/A105M
6、Specification for Carbon Steel Forgings for Piping ApplicationsA106/A106M Specification for Seamless Carbon Steel Pipe for High-Temperature ServiceA108 Specification for Steel Bar, Carbon and Alloy, Cold-FinishedA182/A182M Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Fo
7、rged Fittings, and Valves and Partsfor High-Temperature ServiceA276 Specification for Stainless Steel Bars and ShapesA335/A335M Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature ServiceA576 Specification for Steel Bars, Carbon, Hot-Wrought, Special QualityB16/B16M Specificati
8、on for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw MachinesB61 Specification for Steam or Valve Bronze CastingsB62 Specification for Composition Bronze or Ounce Metal CastingsB75 Specification for Seamless Copper TubeB124/B124M Specification for Copper and Copper Alloy Forging Rod, Bar,
9、and ShapesB453/B453M Specification for Copper-Zinc-Lead Alloy (Leaded-Brass) Rod, Bar, and ShapesB466/B466M Specification for Seamless Copper-Nickel Pipe and Tube2.2 ANSI Standards:3B16.11 Forged Steel Fittings, Socket Weld, and ThreadedB16.15 Cast Bronze Threaded Fittings2.3 Federal Specifications:
10、SAE International:4QQ-S-637 Steel Bar, Carbon, Cold Finished (Standard Quality, Free Machining)QQ-S-763AMS-QQ-S-763 Steel Steel, Corrosion Resistant, Bars, Wire, Shapes, and Forgings, Corrosion-Resisting Forgings1 This specification is under the jurisdiction of ASTM Committee F25 on Ships and Marine
11、 Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved Aug. 1, 2014May 1, 2018. Published September 2014May 2018. Originally approved in 1981. Last previous edition approved in 20082014 asF721 81 (2008).(2014). DOI: 10.1520/F0721-8
12、1R14.10.1520/F0721-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from American National Stan
13、dards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.4 Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.SAE International (SAE),400 Commonwealth Dr., Warrendale, PA 15096, http:/www.sae.org.This docume
14、nt is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as ap
15、propriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. List of Assemblies3.1 This specification incorporates 13
16、 gage piping assemblies as described in Table 1.4. General Requirements and Guidelines4.1 Fig. 1 shows a typical piping assembly for bottom-connected gages and Fig. 2 a typical piping assembly for back-connectedgages.4.2 A siphon shall be used as shown in all gage applications for steam systems to m
17、aintain a protective water seal between thegage and the steam supply.4.3 Each assembly includes a test connection beyond the gage valve which consists of a tee with a 14-in. NPT threaded plugin the branch. The plug is removable for the purpose of installing a test gage for calibration. As an alterna
18、tive, a gage valve thatincorporates a built-in test connection integral with the valve may be substituted for the gage valve and test tee.4.4 Root connections should be kept to a minimum by connecting other instruments at the tee between the root and gage valves.There is no limit to the number of de
19、ad-end-type instruments that can be served from a single root connection. However, eachinstrument should have its own shutoff valve and, if desired, a test tee may be fitted at each instrument.4.5 Two shutoff valves are generally used in each assembly, a root valve and a gage cutout valve. The gage
20、valve may beeliminated and a single shutoff valve may serve as both a root and gage valve provided the gage is within 6 ft (1.8 m) of the rootconnection and readily accessible and the single shutoff valve is fitted within 12 in. (300 mm) of the root connection.4.6 Pulsation dampeners are shown for c
21、ertain assemblies between the test tee and gage and should be used in other assembliesin which the gage may be subjected to pulsating pressures, as from a reciprocating pump, air compressor, quick-acting solenoidvalves, and high-frequency vibrations of high-pressure feed pumps.4.7 Isolation devices
22、(diaphragm seals) should be installed where system fluid viscosity and fuel isolation is a consideration.TABLE 1 Gage Piping AssembliesA,BAssemblyNo. ServiceMaximum Pressure,psi (kPa)Maximum Temperature,F (C)1 Superheated steam 1125 (7757) 960 (516)2 High-pressure desuperheated steam and high-pressu
23、re extractions 1100 (7584) 580 (304)3 Low-pressure extractions, gland seal, auxiliary exhaust, and 150-psig (1034-MPa)steam900 (6205) 563 (295)4 Low-pressure steam 125 (861) 353 (178)5 Boiler feed discharge 1500 (10 342) 450 (232)6 Feed suction and condensate 165 (1138) 300 (149)7 Compressed air abo
24、ve 165 psi (1.14 MPa) 900 (6205) 563 (295)8 Compressed air 165 (1138) 300 (149)9 Fresh and potable water 200 (1379) 150 (66)10 Main and auxiliary salt water circulating, salt water service, and wet firemain 200 (1379) 150 (66)11 Dry firemain and deck washdown 200 (1379) 150 (66)12 Fuel oil and lube
25、oil 900 (6205) 250 (121)13 Diesel oil 900 (6205) 563 (295)A For typical piping assemblies see Fig. 1 and Fig. 2.B For materials required see Table 2 and Table 3.F721 1825. Services, Pressure/Temperature Limitations, and Material5.1 Service and pressure/temperature limitations for each assembly are l
26、isted in Table 1 and materials are listed in Table 2 andTable 3. Other services, pressure/temperatures, and materials may be used provided the materials selected are compatible with theNOTE 1For material identification see Table 3.NOTE 2Use siphon for Assemblies 1 through 4.NOTE 3For pulsation dampe
27、ner requirements see 4.6 and Table 3.NOTE 4Piping through the root valve is normally detailed on the piping arrangement drawings but is shown here as an aid in establishing materialrequirements.FIG. 1 Typical Piping Assembly for Bottom-Connected GagesNOTE 1For material identification see Table 3.NOT
28、E 2Use siphon for Assemblies 1 through 4.NOTE 3For pulsation dampener requirements see 4.6 and Table 3.NOTE 4Piping through the root valve is normally detailed on the piping arrangement drawings but is shown here as an aid in establishing materialrequirements.FIG. 2 Typical Piping Assembly for Back-
29、Connected GagesF721 183intended system media, and the pressure/temperature limitations do not exceed the limitations of the material chosen.TABLE 2 Material ListPart No. Nominal Size, in. Description Material Specification1 12 NPS by 12 FPT Globe valve, thread by socket weld alloy steel (Cr-Mo) ASTM
30、 A182/A182M, F112 14 FPT Globe needle valve, thread, bar stock type carbon steel QQ-S-637, Grades 1213 and 12152 14 FPT Globe needle valve, thread, bar stock type carbon steel ASTM A108, Grades 1213 and12153 14 NPS by 14 FPT Globe needle valve, thread by socket weld, barstock typecarbon steel QQ-S-6
31、37, 1213 and 12153 14 NPS by 14 FPT Globe needle valve, thread by socket weld, barstock typecarbon steel ASTM A108, 1213 and 12154 12 NPS by 12 FPT Globe needle valve, thread by socket weld, barstock typecarbon steel QQ-S-637, 1213 and 12154 12 NPS by 12 FPT Globe needle valve, thread by socket weld
32、, barstock typecarbon steel ASTM A108, 1213 and 12155 14 NPS Globe needle valve, socket weld, bar stock type carbon steel QQ-S-637, 1213 and 12155 14 NPS Globe needle valve, socket weld, bar stock type carbon steel ASTM A108, 1213 and 12156 14 NPS by 14 FPT Globe needle valve, thread by socket weld,
33、 barstock type316 stainless steel QQ-S-7636 14 NPS by 14 FPT Globe needle valve, thread by socket weld, barstock type316 stainless steel AMS-QQ-S-7637 14 FPT Globe needle valve, thread, bar stock type 316 stainless steel QQ-S-7637 14 FPT Globe needle valve, thread, bar stock type 316 stainless steel
34、 AMS-QQ-S-7638 14 NPS by 14 FPT Globe needle valve, thread by silbraze bronze ASTM B619 14 FPT Globe needle valve, thread bronze ASTM B6110 12 NPS Pipe, Schedule 80 alloy steel (Cr-Mo) ASTM A335/A335M, P1111 14 NPS Pipe, Schedule 80 carbon steel ASTM A106/A106M, Grade B12 12 NPS Pipe, Schedule 80 ca
35、rbon steel ASTM A106/A106M, Grade B13 14 NPS Pipe, Schedule 80 copper-nickel 90-10 ASTM B466/B466M, Alloy 70614 14 OD Tubing, 0.065-in. (1.65-mm) wall carbon steel ASTM A106/A106M, Grade B15 14 OD Tubing, 0.035-in. (0.89-mm) wall copper ASTM B7516 14 OD by 12 MPT Connector, tube by thread, compressi
36、on type carbon steel ASTM A108, Grade 12L1417 12 by 14 NPS Reducing insert, socket weld carbon steel ASTM A105/A105M, ANSI B16.1118 14 FPT Tee, thread carbon steel ASTM A105/A105M, ANSI B16.1119 14 MPT Plug, thread carbon steel ASTM A105/A105M, ANSI B16.1120 14 NPS Tee, socket weld carbon steel ASTM
37、 A105/A105M, ANSI B16.1121 14 NPS Union, socket weld carbon steel ASTM A105/A105M, ANSI B16.1122 14 NPS Coupling carbon steel ASTM A105/A105M, ANSI B16.1123 14 OD by 14 MPT Connector, tube by thread, compression type carbon steel ASTM A108, Grade 12L1424 14 OD Tee, tube, compression type carbon stee
38、l ASTM A576, Grade 12L1425 14 OD Union, tube, compression type carbon steel ASTM A108, Grade 12L1426 14 FPT Tee thread bronze ASTM B62, ANSI B16.1527 14 MPT Plug, thread bronze ASTM B62, ANSI B16.1528 14 OD Union, tube, compression type brass ASTM B453/B453M, Alloy 345;ASTMB16/B16M, Alloy 36029 14 O
39、D by 14 MPT Connector, tube by thread, compression type brass ASTM B453/B453M, Alloy 345;ASTMB16/B16M, Alloy 36030 14 OD Tee, tube, compression type brass ASTM B124/B124M, Alloy 37731 14 OD by 14 MPT Connector, tube by thread, compression type 316 stainless steel ASTM A27632 14 OD Tee, tube, compres
40、sion type 316 stainless steel ASTM A27633 14 MPT by 14 FPT Pulsation dampener, thread 316 stainless steel commercial34 14 FPT 90 elbow, thread carbon steel ASTM A105/A105M, ANSI B16.1135 14 FPT 90 elbow, thread bronze ASTM B62, ANSI B16.1536 14 OD Union, tube, compression type 316 stainless steel AS
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46、 3 Material Part Numbers Used in Gage Piping AssembliesAAssemblyB No. Component Identification Letter (See Fig. 1 for Bottom-Connected Gages or Fig. 2 for Back-Connected Gages)A B C D E F G H J K L M NC PC1 . 10 1 16 14 24 25 2 18 19 . . 34 112 . 12 4 16 14 24 25 2 18 19 . . 34 113 . 11 3 23 14 24 2
47、5 2 18 19 . . 34 114 . 11 3 23 15 24 25 2 26 27 . . 34 115 17 11 3 23 14 24 25 2 18 19 33 . 34 116 . 11 3 23 15 24 25 2 26 27 . . 34 117 . 11 3 23 14 24 25 2 18 19 33 . 34 118 . 13 3 23 15 24 25 2 26 27 33 . 34 139 . 13 8 29 15 30 28 9 26 27 . . 35 1310 . 13 6 31 15 32 36 7 26 27 . . 35 1311 . 11 8
48、31 15 32 36 9 26 27 . . 35 1312 . 11 5 . 11 20 22 5 18 19 . 21 34 1113 . 11 3 23 14 24 25 2 18 19 . . 34 11A For description of material part numbers see Table 2.B For service and pressure/temperature limitations of each assembly see Table 1.C “N and “P are for use with back-connected gages only.F721 185
