T/JSAS 074-2024 Nuclear-grade graphite wrapped sealing gaskets

Scope

Scope: This document specifies the basic parameters, requirements, test methods, inspection rules, marking, packaging, transportation, and storage of nuclear-grade graphite-wrapped sealing gaskets (hereinafter referred to as "gaskets"). This document applies to nominal pressures of PN2.5тАУPN160 and Classl50 (PN20)тАУClass2500 (PN420), with nominal diameters of DN10тАУDN3000, used in cooling water systems and hot air circulation systems for pipe flanges. Main technical content: Note: D1 тАУ inner ring inner diameter; D2 тАУ sealing element inner diameter; D3 тАУ sealing element outer diameter; D4 тАУ locating ring outer diameter; T тАУ sealing element thickness; Tl тАУ inner ring and locating ring thickness; t тАУ sealing element thickness excluding filler strips; 4.2 Gasket dimensions The gasket dimensions shall match ASME B16.5, ASME B16.36, and ASME B16.47 flange standards (or be determined according to actual flange dimensions). For other standards and non-standard dimensions, they shall be designed and manufactured separately. 4.3 Dimensional deviations 4.3.1 Dimensional deviations shall comply with Tables 1 and 2: Table 1 Dimensional deviations Nominal diameter (mm) D2 D3 Dl D4 тЙд200 ┬▒0.5 ┬▒0.8 ┬▒0.5-0.8 250тАУ600 ┬▒0.8 ┬▒1.3 ┬▒0.8-1.6 650тАУ1200 ┬▒1.5 ┬▒2.0 ┬▒1.5-2.0 тЙе1300 ┬▒2.0 ┬▒2.5 ┬▒2.0-2.5 Note: For basic and inner-ring type gaskets, D3 shall not have a positive deviation, and for basic type gaskets, D2 shall not have a negative deviation. Table 2 Dimensional deviations Thickness T (mm) Limit deviation (mm) Thickness Ti (mm) Limit deviation (mm) 2.5 ┬▒0.3 1.6 ┬▒0.14 3.2 ┬▒0.16 4.5 ┬▒0.40 3.0 ┬▒0.20 6.5 ┬▒0.24 4.4 Process control 4.4.1 The manufacturing environment of the gaskets shall meet the requirements of Class I working area specified in RCC-M F6000. 4.4.2 After processing, the inner and outer rings of the gaskets shall be cleaned with Class A wa

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