1、Designation: F 721 81 (Reapproved 2004)An American National StandardStandard Specification forGage Piping Assemblies1This standard is issued under the fixed designation F 721; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers detai
3、ls of gage piping assem-blies for pressure gages with optional provisions for additionalgages, pressure switches, transmitters, and so forth, for usewith steam, steam drains, feed water, condensate, fresh water,salt water, compressed air, fuel oil, and lubricating oil systems.1.2 The values stated i
4、n inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.2. Referenced Documents2.1 ASTM Standards:2A 105/A105M Specification for Carbon Steel Forgings forPiping ApplicationsA 106 Specification for Seamless Carbon Steel Pipe forHigh-Temperature Se
5、rviceA 108 Specification for Steel Bars, Carbon, Cold Finished,Standard QualityA 182/A182M Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Partsfor High-Temperature ServiceA 276 Specification for Stainless Steel Bars and ShapesA 335/A335M Specification fo
6、r Seamless Ferritic Alloy-Steel Pipe for High-Temperature ServiceA 576 Specification for Steel Bars, Carbon, Hot-Wrought,Special QualityB 16 Specification for Free-Cutting Brass Rod, Bar, andShapes for Use in Screw MachinesB 61 Specification for Steam or Valve Bronze CastingsB 62 Specification for C
7、omposition Bronze or Ounce MetalCastingsB 75 Specification for Seamless Copper TubeB 124 Specification for Copper and Copper Alloy ForgingRod, Bar, and ShapesB 453/B 453M Specification for Copper-Zinc-Lead Alloy(Leaded-Brass) Rod, Bar, and ShapesB 466/B 466M Specification for Seamless Copper-NickelP
8、ipe and Tube2.2 American National Standard Institute Standards:3B16.11 Forged Steel Fittings, Socket Weld, and ThreadedB16.15 Cast Bronze Threaded Fittings2.3 Federal Specifications:4QQ-S-637 Steel Bar, Carbon, Cold Finished (StandardQuality, Free Machining)QQ-S-763 Steel Bars, Wire, Shapes, and For
9、gings,Corrosion-Resisting3. List of Assemblies3.1 This specification incorporates 13 gage piping assem-blies 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 forback-connected gage
10、s.4.2 A siphon shall be used as shown in all gage applicationsfor steam systems to maintain a protective water seal betweenthe gage and the steam supply.4.3 Each assembly includes a test connection beyond thegage valve which consists of a tee with a14-in. NPT threadedplug in the branch. The plug is
11、removable for the purpose ofinstalling a test gage for calibration. As an alternative, a gagevalve that incorporates a built-in test connection integral withthe valve may be substituted for the gage valve and test tee.4.4 Root connections should be kept to a minimum byconnecting other instruments at
12、 the tee between the root andgage valves. There is no limit to the number of dead-end-typeinstruments that can be served from a single root connection.However, each instrument should have its own shutoff valveand, if desired, a test tee may be fitted at each instrument.4.5 Two shutoff valves are gen
13、erally used in each assembly,a root valve and a gage cutout valve. The gage valve may be1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved No
14、v. 1, 2004. Published November 2004. Originallyapproved in 1981. Last previous edition approved in 1998 as F 721 81 (1998).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, re
15、fer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
16、1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.eliminated and a single shutoff valve may serve as both a rootand gage valve provided the gage is within 6 ft (1.8 m) of theroot connection and readily accessible and the single shutoff
17、valve is fitted within 12 in. (300 mm) of the root connection.4.6 Pulsation dampeners are shown for certain assembliesbetween the test tee and gage and should be used in otherassemblies in which the gage may be subjected to pulsatingpressures, as from a reciprocating pump, air compressor,quick-actin
18、g solenoid valves, and high-frequency vibrations ofhigh-pressure feed pumps.4.7 Isolation devices (diaphragm seals) should be installedwhere system fluid viscosity and fuel isolation is a consider-ation.5. Services, Pressure/Temperature Limitations, andMaterial5.1 Service and pressure/temperature li
19、mitations for eachassembly are listed in Table 1 and materials are listed in Table2 and Table 3. Other services, pressure/temperatures, andmaterials may be used provided the materials selected arecompatible with the intended system media, and the pressure/temperature limitations do not exceed the li
20、mitations of thematerial chosen.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-pressure extractions 1100 (7584) 580 (304)3 Low-pressure extractions, gland seal
21、, 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 above 165 psi (1.14 MPa) 900 (6205) 563 (295)8 Compressed air 165 (1138) 300
22、(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 oil 900 (6205) 250 (121)13 Diesel oil 900 (6205) 563 (295)AFor typical pip
23、ing assemblies see Fig. 1 and Fig. 2.BFor materials required see Table 2 and Table 3.NOTE 1For material identification see Table 3.NOTE 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
24、piping arrangement drawings but is shown here as an aid in establishingmaterial requirements.FIG. 1 Typical Piping Assembly for Bottom-Connected GagesNOTE 1For material identification see Table 3.NOTE 2Use siphon for Assemblies 1 through 4.NOTE 3For pulsation dampener requirements see 4.6 and Table
25、3.NOTE 4Piping through the root valve is normally detailed on thepiping arrangement drawings but is shown here as an aid in establishingmaterial requirements.FIG. 2 Typical Piping Assembly for Back-Connected GagesF 721 81 (2004)2TABLE 2 Material ListPart No. Nominal Size, in. Description Material Sp
26、ecification112 NPS by12 FPT Globe valve, thread by socket weld alloy steel (Cr-Mo) ASTM A 182/A 182M, F 11214 FPT Globe needle valve, thread, bar stock type carbon steel QQ-S-637, Grades 1213 and 1215314 NPS by14 FPT Globe needle valve, thread by socket weld, barstock typecarbon steel QQ-S-637, 1213
27、 and 1215412 NPS by12 FPT Globe needle valve, thread by socket weld, barstock typecarbon steel QQ-S-637, 1213 and 1215514 NPS Globe needle valve, socket weld, bar stock type carbon steel QQ-S-637, 1213 and 1215614 NPS by14 FPT Globe needle valve, thread by socket weld, barstock type316 stainless ste
28、el QQ-S-763714 FPT Globe needle valve, thread, bar stock type 316 stainless steel QQ-S-763814 NPS by14 FPT Globe needle valve, thread by silbraze bronze ASTM B 61914 FPT Globe needle valve, thread bronze ASTM B 611012 NPS Pipe, Schedule 80 alloy steel (Cr-Mo) ASTM A 335, P111114 NPS Pipe, Schedule 8
29、0 carbon steel ASTM A 106, Grade B1212 NPS Pipe, Schedule 80 carbon steel ASTM A 106, Grade B1314 NPS Pipe, Schedule 80 copper-nickel 90-10 ASTM B 466/B 466M, Alloy 7061414 OD Tubing, 0.065-in. (1.65-mm) wall carbon steel ASTM A 106, Grade B1514 OD Tubing, 0.035-in. (0.89-mm) wall copper ASTM B 7516
30、14 OD by12 MPT Connector, tube by thread, compression type carbon steel ASTM A 108, Grade 12L141712 by14 NPS Reducing insert, socket weld carbon steel ASTM A 105/A 105M, ANSI B16.111814 FPT Tee, thread carbon steel ASTM A 105/A 105M, ANSI B16.111914 MPT Plug, thread carbon steel ASTM A 105/A 105M, A
31、NSI B16.112014 NPS Tee, socket weld carbon steel ASTM A 105/A 105M, ANSI B16.112114 NPS Union, socket weld carbon steel ASTM A 105/A 105M, ANSI B16.112214 NPS Coupling carbon steel ASTM A 105/A 105M, ANSI B16.112314 OD by14 MPT Connector, tube by thread, compression type carbon steel ASTM A 108, Gra
32、de 12L142414 OD Tee, tube, compression type carbon steel ASTM A 576, Grade 12L142514 OD Union, tube, compression type carbon steel ASTM A 108, Grade 12L142614 FPT Tee thread bronze ASTM B 62, ANSI B16.152714 MPT Plug, thread bronze ASTM B 62, ANSI B16.152814 OD Union, tube, compression type brass AS
33、TM B 453/B 453M, Alloy 345;ASTMB 16, Alloy 3602914 OD by14 MPT Connector, tube by thread, compression type brass ASTM B 453/B 453M, Alloy 345;ASTMB 16, Alloy 3603014 OD Tee, tube, compression type brass ASTM B 124, Alloy 3773114 OD by14 MPT Connector, tube by thread, compression type 316 stainless s
34、teel ASTM A 2763214 OD Tee, tube, compression type 316 stainless steel ASTM A 2763314 MPT by14 FPT Pulsation dampener, thread 316 stainless steel commercial3414 FPT 90 elbow, thread carbon steel ASTM A 105/A 105M, ANSI B16.113514 FPT 90 elbow, thread bronze ASTM B 62, ANSI B16.153614 OD Union, tube,
35、 compression type 316 stainless steel ASTM A 276TABLE 3 Material Part Numbers Used in Gage Piping AssembliesAAssemblyBNo.Component Identification Letter (See Fig. 1 for Bottom-Connected Gages or Fig. 2 for Back-Connected Gages)ABCDEFGHJKL MNCPC1 . 10 1 16 14 24 25 2 18 19 . . 34 112 . 12 4 16 14 24
36、25 2 18 19 . . 34 113 . 11 3 23 14 24 25 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
37、31 15 32 36 7 26 27 . . 35 1311 . 11 8 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 11AFor description of material part numbers see Table 2.BFor service and pressure/temperature limitations of each assembly see Table 1.C“N and “P are for us
38、e with back-connected gages only.F 721 81 (2004)3ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights
39、, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for re
40、vision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing yo
41、u shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F 721 81 (2004)4
