Our advantage fully welded ball valve,automatic recirculation valve supplier - Edvc Valve

Brief introduction of valve fire resistance test:
The valve fire test is a test used to evaluate the pressure bearing performance of the valve under or under fire conditions. The verification basis is the internal and external leakage of the valve after the test. Valves are used in flammable and explosive conditions. After a certain period of time, they must still have operational performance and certain sealing performance. Therefore, it is necessary to do a fire test on the valve, and the fire test needs are refined in many aspects: operation test, low pressure test after cooling, external leakage during fire, internal leakage during fire.

Introduction to API6FA fire certification:
API is the abbreviation of the American Petroleum Institute, 6FA is a fire certification for the 6A standard valve fire test, 607 is a fire certification for the 6D (referring to the valve that can only rotate 90 degrees) standard valve fire test certification, API6A is The standard for wellhead safety valve corresponds to ISO10423. API6D is a standard for pipeline ball valves, corresponding to ISO14316.

API fire test standard:
API607-Fire Test for Quarter-Turn Valves and Valves Equipped with Nonmetallic Seats
API6FA-Specification for Fire Test for Valves Valve fire resistance test specification, applicable to valves in accordance with API6A and API6D (excluding check valves). 5-inch and 800-pound valves are not covered in API6FA.
API6FD-Specification for Fire Test for Check Valves

API6FA fire protection certification points:
The operation test is to operate the valve under the high-pressure test pressure specified by the standard, the valve is from fully closed to half-open or fully open position, the steam in the pipeline is drained to fill the pipeline with water, and then the downstream pipeline is closed and the high-pressure specified by the standard is used. Measure the external leakage of the valve under the test pressure. The low-pressure test after cooling is the internal leakage and external leakage of the valve measured under the low-pressure test pressure specified in the standard after the forced cooling of the valve after the fire is completed. External leakage during burning refers to leakage through valve body flange connections, threaded connections and valve stem seals during burning under the specified test pressure. Internal leakage during fire refers to leakage through the valve seat during fire at the specified test pressure.

API607/6FA valve fire resistance test coverage:
The coverage of API607 and API6FA are different, and the coverage methods are mainly divided into several aspects such as size coverage, pressure level coverage, and material coverage.
There is a big difference in the selection of test pressure. Among them, the low test pressure specified by API607 is 0.2MPa, and the high test pressure is 75% of the maximum allowable working pressure at 20 degrees, while the low test pressure and high test pressure specified by API6FA are the same as the valve. Pound related.

API 607 ​​stipulates that ferritic test valves can cover valves in austenitic and duplex steel materials, but valves with intermediate sizes within the coverage are also required to pass the test.