FET of Industrial Valves Presentation 1 阀门低泄漏.ppt

Fugitive Emissions Testing of Industrial Valvesin compliance with ISO 15848-2:2006 and MESC SPE 77/312 November 2012 Fugitive Emissions Testingin compliance with ISO 15848-2:2006 and MESC SPE 77/312 November 2012 Table of Contents: Introduction Sampling of Valves Lot identification Sample Size and Selection Acceptance Test Equipment Personnel Test Conditions Testing, Evaluation and Certification Introduction: The intend of Fugitive Emission Test is evaluation of external leakage of isolating and control valve’s stem/shaft and body intended for application with various air pollutants and hazardous fluids as per ISO 15848-2 and MESC SPE 77/312 November 2012. Sampling of Valves The lot identification shall be based following parameters: The valves shall part of the same purchase order. Valves manufacturered in same location with same valve type, design and size (same Stem diameter in case of rising stem type valves) and fugitive emission class. Sample Size and Selection: The representing valves shall be selected at random from each lot. The sample shall cover entire production range when lot consists various pressure class, sizes and Stem diameter. Sample size is selected based on following Table 3 of MESC SPE 77/312:2012 specification. Sampling of Valves: Cont…. Table 3 – Sample strategy for production testing ? Sample size (n) ? Purchase order size per Fugitive emission class Class A(HS) Class B Acceptance number (Ac) X ≤ 100 5 % 3 % 0 101 ≤ X ≤ 1000 4 % 3 % 0 X 1000 3 % 2 % 0 Actual sample size shall be rounded-up to the next whole number with a maximum total sample size of 10 % of the whole purchase order (rounded-up to the next whole number) The testing is applicable to valves for which the design passed prototype testing. Valve assemblies with a gearbox and/or actuator do not require an additional production test, if the same has passed during production test. FET is not required if the prototype testing of same type of valve is passed and the certificate no