Jun,29

API St 624-2014 pdf download

API St 624-2014 pdf download

API St 624-2014 pdf download.Type Testing of Rising Stem Valves Equipped with Graphite Packing for Fugitive Emissions.
1 Scope This standard specifies the requirements and acceptance criteria (100 ppmv) for fugitive emission type testing of rising and rising-rotating stem valves equipped with packing previously tested in accordance with API 622. Packing shall be suitable for use at service temperatures –29 °C to 538 °C (–20 °F to 1000 °F). The type testing requirements contained herein are based upon elements of EPA Method 21. Valves larger than NPS 24 or valves greater than class 1500 are outside the scope of this standard. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. API Standard 602, Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries API Standard 622, Type Testing of Process Valve Packing for Fugitive Emissions ASME B16.34 1 , Valves—Flanged, Threaded, and Welding End EPA Method 21 2 , Determination of Volatile Organic Compound Leaks 3 Terms and Definitions For the purposes of this document, the following definitions apply. 3.1 ambient temperature Temperature that is between 15 °C to 40 °C (59 °F to 104 °F). 3.2 auxiliary connection Drain(s), vent(s), or sealant injection port(s). 3.3 bolting torque The amount of twisting or turning effort (expressed as N-m, ft-lb, or in.-lb) required to tighten a threaded fastener. 3.4 dynamic leak measurement Measurement of leakage taken while the stem is traveling through an opening and closing cycle. 3.5 EPA Method 21 A leak check method established by the United States Environmental Protection Agency (EPA) for performing emissions measurements on equipment such as valves, pumps, and flanges.
4 Valve Selection and Test Preparation 4.1 The API 622 certificate or test report for the packing in the test valve shall be provided and attached to the API 624 fugitive emissions test report. 4.2 The test valve shall be completely assembled and ready for testing. The test valve shall be randomly selected from manufacturer or distributor stock where such stock is available. For valves not in stock, the manufacturer shall certify that the test valve was not modified in any way to meet type test requirements and is a typical representation of the manufacturer’s stock product. Valve selection shall be approved by the purchaser. 4.3 Body-bonnet and gland bolting torque shall be verified to be in accordance with published manufacturer’s installation specifications. 4.4 All pre-test activities to the valve shall be documented on the Fugitive Emissions Test Report in Annex A. 4.5 As a safety precaution, the air in the valve cavity shall be purged with an inert gas prior to starting the testing. 5 Type Testing 5.1 The test medium used shall be methane 97 % minimum purity. Caution—Methane used during testing is a pressurized flammable gas which requires that appropriate safety measures be taken. 5.1.1 Testing of valves is potentially hazardous and it is essential that the safety of personnel be given prime consideration. Given the nature of this test, hazardous release of pressurized gas could occur. Adequate shields or barriers in the area of the test enclosure and other appropriate means for the protection of personnel shall be provided. 5.1.2 The test facilities shall be designed to ensure that all the test conditions are conducted in a safe and protected environment. It is the responsibility of the testing facility to analyze the hazards resulting from the pressure and temperatures and take proper safety precautions. All applicable safety regulations shall be complied with.
5.2 The stem orientation for a test valve shall be vertical. 5.3 Valves shall be subjected to a total of 310 mechanical cycles and 3 thermal cycles per Figure 1. Mechanical cycling shall begin with the valve at ambient temperature. An optional low temperature test at –29 °C (–20 °F) may be performed if requested by the purchaser (see Figure 1). 5.4 The valve shall be heated using an internal heat source or an external heat source such as electric heating blanket, coils, or other suitable equipment or an appropriate internal heat source. 5.5 The elevated test temperature shall be 260 °C (500 °F) ±5 percent. 5.6 The test pressure shall be the lower of 41.4 barg (600 psig) or the maximum allowable pressure at 260 °C (500 °F) per ASME B16.34 for the applicable material group and shall be held constant throughout the test.

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