T/JSAS 017-2021 Active Group standards

T/JSAS 017-2021 Liquefied natural gas vessel equipment and piping flange gasket

Publish Date: 2021-09-25 Implement Date: 2021-09-25 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/JSAS 017-2021

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Ship pipeline accessories

ICS Name: Seals for pipes and hose assemblies

Publish Date: 2021-09-25

Implement Date: 2021-09-25

Scope

Scope: This document specifies the categories, requirements, inspection methods, inspection rules, and markings, packaging, transportation, and storage of gaskets for LNG ship equipment and pipeline flanges (hereinafter referred to as "LNG gaskets"). This document applies to the design, manufacture, inspection, and acceptance of LNG ship equipment and pipeline flange gaskets; Main technical content: 5.1 Materials: The commonly used LNG gasket materials are listed in Table 2. All raw materials used for manufacturing LNG gaskets shall be accompanied by certificates from the raw material manufacturers and inspection reports. The chemical composition and mechanical properties of the metal materials used for manufacturing LNG gaskets shall meet the requirements specified in Table 2. When using metal materials other than those listed in Table 2, their chemical composition and mechanical properties shall be agreed upon by both the supplier and the purchaser. The non-metallic materials used for manufacturing LNG gaskets shall meet the requirements of the standards specified in Table 2. Among them, the carbon content of flexible graphite shall not be less than 99.5%, the chlorine content shall not exceed 30 μg/g, and the sulfur content shall not exceed 750 μg/g. The modified polytetrafluoroethylene materials shall not use recycled materials. The material surface shall be smooth, free from oil stains, roughness, cracks, scratches, and other defects. The metal materials shall not have rust stains. Before putting into use, the modified polytetrafluoroethylene materials shall undergo low-temperature impact testing in accordance with the provisions of GB/T 12584. 5.2 The manufacturing process of wrapped gaskets shall comply with the requirements specified in GB/T 4622.3. Wrapped gaskets shall be equipped with reinforcing rings. For full-plane (FF) and raised-face (RF) flanges, wrapped gaskets shall also be equipped with inner and outer reinforcing rings, which shall not be allo