新加坡第二液化天然气接收站陆上连接设施总承包项目电动阀/紧急关断和开关阀采购方案

2. Revise the LTCS valve body material / construction requirement for NPS 2" and larger ball valves from ASTM A350 Gr. LF2 forged body to ASTM A352 Gr. LCB cast body, subject to compliance with ASME B16.34, the applicable valve product standard such as API 6D or API 608 as applicable, Project design pressure, design temperature, impact testing, nondestructive examination, hydrostatic test, seat test, material certification and traceability requirements.

3. Revise the ball and stem material for the relevant ball valves from ASTM A182 Gr. F316 to ASTM A182 Gr. F51, subject to compliance with the applicable valve datasheet, service compatibility, material certification, hardness / sour service requirements where specified by the Project, inspection and testing requirements, and vendor design qualification.

4. Revise the pup piece material / wall thickness requirement for CS piggable ball valves from API 5L PSL2 Gr. X65, 19.05 mm wall thickness and 200 mm length at each end, to ASTM A694 Gr. F65 forged material. The valve-end wall thickness shall match the valve body wall thickness, the pipe-end wall thickness shall remain 19.05 mm, and the minimum piggable through bore / ID shall remain 571.5 mm.