文档介绍：Fugitive Emissions Testing of Industrial Valves pliance with ISO 15848-2:2006 and MESC SPE 77/312 November 2012 Fugitive Emissions Testing pliance 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 v