MESC ADDITIONAL REQUIREMENT Revision: 22-03-2001. SPE 77/312 Page 1 of 21. FUGITIVE EMISSION LEAK DETECTION OF VALVES. 1. INTRODUCTION 1.1 SCOPE 1.1.1 (ISA-1.2), (ISA-1.5) (FCI-3) This specification shall apply to the test and evaluation of fugitive emission suppressing performance level of on/off valves, control valves (including valves for vacuum services). 1.1.2 (ISA-1) (ISOp1-1) (ISOp2-1) (ISOp3-1) In this specification a distinction is made between the classification system, qualification procedures tests and methods used for fugitive emission leakage, emitted through valve stem seal, body and bonnet flange seals and plug connections for: - prototype approval test of valve assemblies, - production acceptance testing of valve assemblies, - methods for in-situ (on site) valve fugitive emission measurement. 1.1.3 A fugitive emission is defined as any chemical or mixture of chemicals which represents an unanticipated or spurious leak. 1.1.4 This specification is an amendment / supplement to working draft standards ISO/WD 15848-1.9, ISO/WD 15848-2.1, ISO/WD 15848-3, and standards ANSI / ISA-S 93.00.01 and ANSI / FCI 91-1 and shall be considered to be part of the valve buying description, when referred to in a MESC description and / or requisition. 1.1.5 (ISA-2) The specification describes the type of detection method and test medium to be used and specify the acceptance and rejection criteria. 1.1.6 The numbers in brackets at the section headings refer to the relevant section in the standards as follows: ISA-a = ANSI / ISA-S 93.00.01, ISOp1-b = ISO / WD-15848-1.9, ISOp2-c = ISO / WD-15848-2.1, ISOp3-d = ISO / WD-15848-3, FCI-e = ANSI / FCI 91-1 and EDF = EDF docu ment HT-21/00/032/A. 2. (ISOp1-2) (ISOp2-...
