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ASTM F721-81(2008)

(Specification)

Standard Specification for Gage Piping Assemblies

Standard Specification for Gage Piping Assemblies

ABSTRACT
This specification covers 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. A siphon shall be used as shown in all gage applications for steam systems to maintain a protective water seal between the gage and the steam supply.
SCOPE
1.1 This specification covers 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 stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

Status
Historical
Publication Date
31-Oct-2008
ICS
17.100 - Measurement of force, weight and pressure
Technical Committee
F25 - Ships and Marine Technology
Drafting Committee
F25.11 - Machinery and Piping Systems
Current Stage
Ref Project

Relations

Replaces
ASTM F721-81(2004) - Standard Specification for Gage Piping Assemblies
Effective Date
01-Nov-2008
Replaced By
ASTM F721-81(2014) - Standard Specification for Gage Piping Assemblies
Effective Date
01-Aug-2014

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ASTM F721-81(2008) - Standard Specification for Gage Piping AssembliesASTM F721-81(2008) - Standard Specification for Gage Piping Assemblies
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ASTM F721-81(2008) - Standard Specification for Gage Piping Assemblies
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F721 −81(Reapproved 2008) An American National Standard
Standard Specification for
Gage Piping Assemblies
ThisstandardisissuedunderthefixeddesignationF721;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) 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. Scope B124/B124M Specification for Copper and Copper Alloy
Forging Rod, Bar, and Shapes
1.1 This specification covers details of gage piping assem-
B453/B453M Specification for Copper-Zinc-Lead Alloy
blies for pressure gages with optional provisions for additional
(Leaded-Brass) Rod, Bar, and Shapes
gages, pressure switches, transmitters, and so forth, for use
B466/B466M Specification for Seamless Copper-Nickel
with steam, steam drains, feed water, condensate, fresh water,
Pipe and Tube
salt water, compressed air, fuel oil, and lubricating oil systems.
2.2 American National Standard Institute Standards:
1.2 The values stated in inch-pound units are to be regarded
B16.11 Forged Steel Fittings, Socket Weld, and Threaded
as the standard. The values given in parentheses are for
B16.15 Cast Bronze Threaded Fittings
information only.
2.3 Federal Specifications:
QQ-S-637 Steel Bar, Carbon, Cold Finished (Standard
2. Referenced Documents
Quality, Free Machining)
2.1 ASTM Standards:
QQ-S-763 Steel Bars, Wire, Shapes, and Forgings,
A105/A105M Specification for Carbon Steel Forgings for
Corrosion-Resisting
Piping Applications
A106/A106M Specification for Seamless Carbon Steel Pipe
3. List of Assemblies
for High-Temperature Service
3.1 This specification incorporates 13 gage piping assem-
A108 Specification for Steel Bar, Carbon and Alloy, Cold-
blies as described in Table 1.
Finished
A182/A182M Specification for Forged or Rolled Alloy and
4. General Requirements and Guidelines
Stainless Steel Pipe Flanges, Forged Fittings, and Valves
4.1 Fig. 1 shows a typical piping assembly for bottom-
and Parts for High-Temperature Service
connected gages and Fig. 2 a typical piping assembly for
A276 Specification for Stainless Steel Bars and Shapes
back-connected gages.
A335/A335M Specification for Seamless Ferritic Alloy-
Steel Pipe for High-Temperature Service
4.2 Asiphon shall be used as shown in all gage applications
A576 Specification for Steel Bars, Carbon, Hot-Wrought,
for steam systems to maintain a protective water seal between
Special Quality
the gage and the steam supply.
B16/B16M Specification for Free-Cutting Brass Rod, Bar
4.3 Each assembly includes a test connection beyond the
and Shapes for Use in Screw Machines
gage valve which consists of a tee with a ⁄4-in. NPT threaded
B61 Specification for Steam or Valve Bronze Castings
plug in the branch. The plug is removable for the purpose of
B62 Specification for Composition Bronze or Ounce Metal
installing a test gage for calibration. As an alternative, a gage
Castings
valve that incorporates a built-in test connection integral with
B75 Specification for Seamless Copper Tube
the valve may be substituted for the gage valve and test tee.
4.4 Root connections should be kept to a minimum by
1 connecting other instruments at the tee between the root and
This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on gage valves. There is no limit to the number of dead-end-type
Machinery and Piping Systems.
instruments that can be served from a single root connection.
Current edition approved Nov. 1, 2008. Published December 2008. Originally
approved in 1981. Last previous edition approved in 2004 as F721 – 81 (2004).
DOI: 10.1520/F0721-81R08.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4th Floor, New York, NY 10036.
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F721−81 (2008)
A,B
TABLE 1 Gage Piping Assemblies
Assembly Maximum Pressure, Maximum Temperature,
Service
No. psi (kPa) °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, auxiliary exhaust, and 150-psig (1034-MPa) 900 (6205) 563 (295)
steam
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 (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)
A
For typical piping assemblies see Fig. 1 and Fig. 2.
B
For materials required see Table 2 and Table 3.
NOTE 1—For material identification see Table 3.
NOTE 2—Use siphon for Assemblies 1 through 4.
NOTE 3—For pulsation dampener requirements see 4.6 and Table 3.
NOTE 4—Piping through the root valve is normally detailed on the
NOTE 1—For material identification see Table 3.
piping arrangement drawings but is shown here as an aid in establishing
material requirements. NOTE 2—Use siphon for Assemblies 1 through 4.
FIG. 1Typical Piping Assembly for Bottom-Connected Gages
NOTE 3—For pulsation dampener requirements see 4.6 and Table 3.
NOTE 4—Piping through the root valve is normally detailed on the
piping arrangement drawings but is shown here as an aid in establishing
However, each instrument should have its own shutoff valve
material requirements.
and, if desired, a test tee may be fitted at each instrument.
FIG. 2Typical Piping Assembly for Back-Connected Gages
4.5 Two shutoff valves are generally used in each assembly,
a root valve and a gage cutout valve. The gage valve may be assemblies in which the gage may be subjected to puls
...

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1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1....

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Standard Practices for Calibration and Verification for Force-Measuring Instruments

SIGNIFICANCE AND USE
4.1 Testing machines that apply and indicate force are in general use in many industries. Practices E4 has been written to provide a practice for the force verification of these machines. A necessary element in Practices E4 is the use of force-measuring instruments whose force characteristics are known to be traceable to the SI. Practices E74 describes how these force-measuring instruments are to be calibrated. The procedures are useful to users of testing machines, manufacturers and providers of force-measuring instruments, calibration laboratories that provide the calibration of the instruments and the documents of traceability, service organizations that use the force-measuring instruments to verify testing machines, and testing laboratories performing general structural test measurements.
SCOPE
1.1 The purpose of these practices is to specify procedures for the calibration of force-measuring instruments. Procedures are included for the following types of instruments:  
1.1.1 Elastic force-measuring instruments, and  
1.1.2 Force-multiplying systems, such as balances and small platform scales.  
Note 1: Verification by deadweight loading is also an acceptable method of verifying the force indication of a testing machine. Tolerances for weights for this purpose are given in Practices E4; methods for calibration of the weights are given in NIST Technical Note 577(1)2, Methods of Calibrating Weights for Piston Gages.  
1.2 The values stated in SI units are to be regarded as the standard. Other metric and inch-pound values are regarded as equivalent when required.  
1.3 These practices are intended for the calibration of static force measuring instruments. It is not applicable for dynamic or high speed force calibrations, nor can the results of calibrations performed in accordance with these practices be assumed valid for dynamic or high speed force measurements.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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