This standard specifies the types and dimensions of spiral wound gaskets for pipeline flanges. This standard is applicable to spiral wound gaskets for pipeline flanges with a nominal pressure pN of 2.5 to 10.0MPa.
JB/T 90-1994 history
2015JB/T 90-2015 Spiral wound gaskets for pipe flanges
1994JB/T 90-1994 Wound style gaskets for pipeline flanges