ASTM F721-18(2022)
(Specification)Standard Specification for Gauge Piping Assemblies
Standard Specification for Gauge 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 gauge piping assemblies for pressure gauges with optional provisions for additional gauges, 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 standard. The values given in parentheses are 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 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.
General Information
- Status
- Published
- Publication Date
- 30-Sep-2022
- Technical Committee
- F25 - Ships and Marine Technology
- Drafting Committee
- F25.11 - Machinery and Piping Systems
Relations
- Effective Date
- 15-Apr-2024
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Nov-2023
- Effective Date
- 29-Sep-2023
- Refers
ASTM B124/B124M-20 - Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes - Effective Date
- 01-Apr-2020
- Effective Date
- 01-Nov-2019
- Effective Date
- 01-Nov-2019
- Effective Date
- 01-Oct-2019
- Effective Date
- 01-Oct-2019
- Effective Date
- 01-Apr-2019
- Refers
ASTM B124/B124M-19 - Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes - Effective Date
- 01-Apr-2019
- Effective Date
- 01-Nov-2018
- Effective Date
- 01-Oct-2018
Overview
ASTM F721-18(2022) - Standard Specification for Gauge Piping Assemblies provides comprehensive requirements for the design, assembly, and installation of piping assemblies used with pressure gauges and associated instrumentation. This standard plays a critical role in ensuring the safe and reliable functioning of pressure measurement systems in various industrial and marine applications. It establishes specifications for gauge piping that accommodate not only pressure gauges, but also allow for additional instruments like pressure switches and transmitters, meeting the demands of complex system monitoring.
The standard applies to assemblies used with fluids including steam, steam drains, feed water, condensate, fresh water, salt water, compressed air, fuel oil, and lubricating oil. It also includes requirements for maintaining safe water seals in steam service through the use of siphons, ensuring longevity and safety of pressure instruments.
Key Topics
- Gauge Piping Assembly Types: Covers 13 specific gauge piping assemblies, each tailored to particular service pressures, temperatures, and media such as superheated steam, compressed air, and various water and oil systems.
- Material Specifications: Identifies ASTM, ANSI, and SAE material standards for all piping components, ensuring compatibility and durability based on the service demands.
- Valve and Connection Requirements: Defines use of shutoff valves, test connections for calibration, and guidelines for connecting multiple instruments.
- Protective Devices: Mandates siphons for steam services to protect gauges from direct steam exposure with a water seal; outlines use of pulsation dampeners and isolation devices as necessary for system protection.
- Service Limitations: Specifies maximum pressure and temperature ratings for each assembly, promoting operational safety and system integrity.
Applications
ASTM F721-18(2022) is widely used across industries where pressure measurement systems are critical, with a particular focus on:
- Marine and Shipboard Systems: Ensures safe gauge operation in steam, water, air, and oil pipelines on vessels, improving marine system reliability and meeting defense agency requirements.
- Industrial Steam and Water Systems: Sets standardized approaches for gauge piping in boiler plants, power generation, water treatment, and industrial processing environments.
- Compressed Air and Fluid Handling: Provides detailed assembly instructions for air compressors, pumps, and oil handling systems, enhancing maintenance and operational efficiency.
- Calibration and Maintenance: The inclusion of test connections allows for routine calibration, ensuring ongoing accuracy of pressure monitoring devices.
By adhering to this standard, organizations can reduce the risk of system failures due to incorrect piping or material selection and ensure streamlined maintenance and inspection processes.
Related Standards
ASTM F721-18(2022) references several key material and component standards, including:
- ASTM A105/A105M - Carbon Steel Forgings for Piping Applications
- ASTM A182/A182M - Alloy and Stainless Steel Pipe Flanges and Forged Fittings
- ASTM A106/A106M - Seamless Carbon Steel Pipe for High-Temperature Service
- ASTM B61, B62 - Bronze Castings for Valve and Fittings
- ASTM B75, B466/B466M - Copper Tube and Copper-Nickel Pipe
- ANSI B16.11, B16.15 - Forged Steel and Cast Bronze Fittings
- SAE AMS-QQ-S-763 - Corrosion Resistant Steel Bars and Forgings
For organizations aiming to achieve robust and code-compliant pressure instrumentation installations, ASTM F721-18(2022) serves as an essential reference for gauge piping assemblies and associated system components. Utilizing this standard supports operational safety, equipment longevity, and regulatory compliance across a wide range of industries.
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Frequently Asked Questions
ASTM F721-18(2022) is a technical specification published by ASTM International. Its full title is "Standard Specification for Gauge Piping Assemblies". This standard covers: 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 gauge piping assemblies for pressure gauges with optional provisions for additional gauges, 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 standard. The values given in parentheses are 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 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.
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 gauge piping assemblies for pressure gauges with optional provisions for additional gauges, 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 standard. The values given in parentheses are 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 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.
ASTM F721-18(2022) is classified under the following ICS (International Classification for Standards) categories: 17.100 - Measurement of force, weight and pressure. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM F721-18(2022) has the following relationships with other standards: It is inter standard links to ASTM A105/A105M-24, ASTM A335/A335M-24, ASTM A182/A182M-24, ASTM A108-24, ASTM A576-23, ASTM A335/A335M-95a, ASTM B124/B124M-20, ASTM A106/A106M-19a, ASTM A182/A182M-19a, ASTM B124/B124M-19a, ASTM B16/B16M-19, ASTM B453/B453M-19, ASTM B124/B124M-19, ASTM A108-18, ASTM B124/B124M-18a. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM F721-18(2022) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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.
Designation: F721 −18 (Reapproved 2022) An American National Standard
Standard Specification for
Gauge 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 A576 Specification for Steel Bars, Carbon, Hot-Wrought,
Special Quality
1.1 This specification covers details of gauge piping assem-
B16/B16M Specification for Free-Cutting Brass Rod, Bar
blies for pressure gauges with optional provisions for addi-
and Shapes for Use in Screw Machines
tional gauges, pressure switches, transmitters, and so forth, for
B61 Specification for Steam or Valve Bronze Castings
use with steam, steam drains, feed water, condensate, fresh
B62 Specification for Composition Bronze or Ounce Metal
water, salt water, compressed air, fuel oil, and lubricating oil
Castings
systems.
B75 Specification for Seamless Copper Tube (Metric)
1.2 The values stated in inch-pound units are to be regarded
B0075_B0075M
as standard. The values given in parentheses are mathematical
B124/B124M Specification for Copper and Copper Alloy
conversions to SI units that are provided for information only
Forging Rod, Bar, and Shapes
and are not considered standard.
B453/B453M Specification for Copper-Zinc-Lead Alloy
1.3 This international standard was developed in accor-
(Leaded-Brass) Rod, Bar, and Shapes
dance with internationally recognized principles on standard- B466/B466M Specification for Seamless Copper-Nickel
ization established in the Decision on Principles for the
Pipe and Tube
Development of International Standards, Guides and Recom-
2.2 ANSI Standards:
mendations issued by the World Trade Organization Technical
B16.11 Forged Steel Fittings, Socket Weld, and Threaded
Barriers to Trade (TBT) Committee.
B16.15 Cast Bronze Threaded Fittings
2.3 SAE International:
2. Referenced Documents
AMS-QQ-S-763 Steel, Corrosion Resistant, Bars, Wire,
2.1 ASTM Standards: Shapes, and Forgings
A105/A105M Specification for Carbon Steel Forgings for
3. List of Assemblies
Piping Applications
A106/A106M Specification for Seamless Carbon Steel Pipe
3.1 This specification incorporates 13 gauge piping assem-
for High-Temperature Service
blies as described in Table 1.
A108 Specification for Steel Bar, Carbon and Alloy, Cold-
4. General Requirements and Guidelines
Finished
A182/A182M Specification for Forged or Rolled Alloy and
4.1 Fig. 1 shows a typical piping assembly for bottom-
Stainless Steel Pipe Flanges, Forged Fittings, and Valves
connected gauges and Fig. 2 a typical piping assembly for
and Parts for High-Temperature Service
back-connected gauges.
A276 Specification for Stainless Steel Bars and Shapes
4.2 A siphon shall be used as shown in all gauge applica-
A335/A335M Specification for Seamless Ferritic Alloy-
tions for steam systems to maintain a protective water seal
Steel Pipe for High-Temperature Service
between the gauge and the steam supply.
4.3 Each assembly includes a test connection beyond the
1 1
This specification is under the jurisdiction of ASTM Committee F25 on Ships
gauge valve which consists of a tee with a ⁄4-in. NPT threaded
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
plug in the branch. The plug is removable for the purpose of
Machinery and Piping Systems.
installingatestgaugeforcalibration.Asanalternative,agauge
Current edition approved Oct. 1, 2022. Published October 2022. Originally
approved in 1981. Last previous edition approved in 2018 as F721 – 18. DOI:
10.1520/F0721-18R22.
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 Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
the ASTM website. PA 15096, http://www.sae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F721 − 18 (2022)
A,B
TABLE 1 Gauge 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. 1 Typical Piping Assembly for Bottom-Connected Gauges
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
valve that incorporates a built-in test connection integral with
material requirements.
the valve may be substituted for the gauge valve and test tee.
FIG. 2 Typical Piping Assembly for Back-Connected Gauges
4.4 Root connections should be kept to a minimum by
connecting other instruments at the tee between the root and
gauge valves.There is no limit to the number of dead-end-type
instruments that can be served from a single root connection. 4.6 Pulsation dampeners are shown for certain assemblies
However, each instrument should have its o
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