ASTM F2138-12

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An American National Standard
Designation:F2138–09 Designation: F2138 – 12
Standard Specification for
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Excess Flow Valves for Natural Gas Service
This standard is issued under the fixed designation F2138; 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.
1. Scope*
1.1 This specification covers requirements and test methods for excess flow valves for use in thermoplastic natural gas piping
systems. However, it is expected that excess flow valves manufactured to the requirements of this specification may also be used
in other natural gas piping systems.
1.2 Excess flow valves covered by this specification are designed for insertion into components for natural gas systems such
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as pipe, tubing, or fittings in sizes from 1/2 ⁄2 CTS to 2 IPS.
1.3 The tests required by this specification are intended to determine the performance characteristics of an excess flow valve
installed in a straight piece of pipe. An excess flow valve could possibly be installed in a straight piece of pipe, in a service tee
outlet, as part of a mechanical coupling, or in other configurations. The performance characteristics of the excess flow valve may
be significantly different for each installed configuration. Users should conduct their own tests to determine the installed
performance characteristics or contact the EFV manufacturer for test data for the installed configuration. Additional guidance on
selection and installation of excess flow valves is included in Appendix X1.
1.4 The tests required by this specification are not intended to be routine quality control tests.
1.5 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.
1.6 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 and health practices and determine the applicability of regulatory
requirements prior to use.
2. Referenced Documents
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2.1 ASTM Standards:
D1600 Terminology for Abbreviated Terms Relating to Plastics
F412 Terminology Relating to Plastic Piping Systems
F1802 Test Method for Performance Testing of Excess Flow Valves Test Method for Performance Testing of Excess Flow
Valves
F2897 Specification for Tracking and Traceability Encoding System of Natural Gas Distribution Components (Pipe, Tubing,
Fittings, Valves, and Appurtenances)
3. Terminology
3.1 Definitions of Terms:
3.1.1 Definitions are in accordance with Terminology F412, unless otherwise specified. Abbreviations are in accordance with
Terminology D1600.
3.1.2 bypass flow, n—an intentional rate of passage of natural gas through an EFVB after trip, which will allow upstream and
downstream pressure to equalize across the device to automatically reset to the open position after removal of a fault condition.
3.1.3 excess flow valve, EFV, n—a device installed in a natural gas piping system to automatically stop or limit the passage of
natural gas when the rate of passage of natural gas through the device exceeds a predetermined level.
3.1.4 excess flow valve bypass, EFVB, n—an EFVdesigned to limit the flow of gas after trip to a small predetermined level and
to reset automatically after the pressure is equalized across the valve.
3.1.5 excess flow valve non-bypass, EFVNB, n—an EFV designed to stop the flow of gas after trip and to be reset manually.
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This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.
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Current edition approved March 1, 2009. Published April 2009. Originally approved in 2001. Last previous edition approved in 2001 as F2138–01 . DOI:
10.1520/F2138-09.
Current edition approvedApril 1, 2012. Published May 2012. Originally approved in 2001. Last previous edition approved in 2009 as F2138–09. DOI: 10.1520/F2138-12.
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volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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