This specification covers requirements and test methods for excess flow valves for natural gas piping systems. Tests methods requirements shall determine the performance characteristics of an excess flow valve installed in a straight piece of pipe. Excess flow valves shall conform to specified materials, dimensions, maximum inlet pressure, temperature rating range, and design requirements. It shall be tested with the following performance requirements: trip flow, leak rate, bypass flow, pressure drop, reset parameters, snap acting loads, and cycle testing.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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 as pipe, tubing, or fittings in sizes from 1/2 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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
F2897 Specification for Tracking and Traceability Encoding System of Natural Gas Distribution Components (Pipe, Tubing, Fittings, Valves, and Appurtenances)
excess flow valve; (EFV); Excess flow valve (EFV); Natural gas service systems--specifications; Performance--plastics; Thermoplastic pipe/tube/fittings--specifications
ICS Number Code 75.200 (Petroleum products and natural gas handling equipment)
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