ASTM F721-81(2014)

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-Jul-2014
• ICS: 17.100 - Measurement of force, weight and pressure
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Relations

• Replaces: ASTM F721-81(2008) - Standard Specification for Gage Piping Assemblies
• Effective Date: 01-Aug-2014

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 2014) 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 ANSI 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 Aug. 1, 2014. Published September 2014. Originally
approved in 1981. Last previous edition approved in 2008 as F721 – 81 (2008).
DOI: 10.1520/F0721-81R14.
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 [e-mail]. 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 (2014)
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 pulsating
eliminated and a single shutoff valve may serv
...

This document 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. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F721 − 81 (Reapproved 2008) F721 − 81 (Reapproved 2014)An American National Standard
Standard Specification for
Gage Piping Assemblies
This standard is issued under the fixed designation F721; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
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
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.
2. Referenced Documents
2.1 ASTM Standards:
A105/A105M Specification for Carbon Steel Forgings for Piping Applications
A106/A106M Specification for Seamless Carbon Steel Pipe for High-Temperature Service
A108 Specification for Steel Bar, Carbon and Alloy, Cold-Finished
A182/A182M Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts
for High-Temperature Service
A276 Specification for Stainless Steel Bars and Shapes
A335/A335M Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
A576 Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality
B16/B16M Specification for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw Machines
B61 Specification for Steam or Valve Bronze Castings
B62 Specification for Composition Bronze or Ounce Metal Castings
B75 Specification for Seamless Copper Tube
B124/B124M Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes
B453/B453M Specification for Copper-Zinc-Lead Alloy (Leaded-Brass) Rod, Bar, and Shapes
B466/B466M Specification for Seamless Copper-Nickel Pipe and Tube
2.2 American National Standard Institute ANSI Standards:
B16.11 Forged Steel Fittings, Socket Weld, and Threaded
B16.15 Cast Bronze Threaded Fittings
2.3 Federal Specifications:
QQ-S-637 Steel Bar, Carbon, Cold Finished (Standard Quality, Free Machining)
QQ-S-763 Steel Bars, Wire, Shapes, and Forgings, Corrosion-Resisting
3. List of Assemblies
3.1 This specification incorporates 13 gage piping assemblies as described in Table 1.
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
Machinery and Piping Systems.
Current edition approved Nov. 1, 2008Aug. 1, 2014. Published December 2008September 2014. Originally approved in 1981. Last previous edition approved in 20042008
as F721 – 81 (2004).(2008). DOI: 10.1520/F0721-81R08.10.1520/F0721-81R14.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 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 (2014)
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.
4. General Requirements and Guidelines
4.1 Fig. 1 shows a typical piping assembly for bottom-connected gages and Fig. 2 a typical piping assembly for back-connected
gages.
4.2 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.
4.3 Each assembly includes a test connection beyond the gage valve which consists of a tee with a ⁄4-in. NPT threaded plug
in the branch. The plug is removable for the purpose of installing a test gage for calibration. As an alternative, a gage valve that
incorporates 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 dead-end-type instruments that can be served from a single root connection. However, each
instrument 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 valve may be
eliminated 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 root
connection and readily accessible and the single shutoff valve is fitted within 12 in. (300 mm) of the root connection.
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 piping arrangement drawings but is shown here as an aid in establishing material
requirements.
FIG. 1 Typical Piping Assembly for Bottom-Connected Gages
F72
...