Is an winding gasket suitable for DN1100PN6.4 container flanges?
Thread Content
The gasket for the flange DN1100PN6.4 of a container (DP48bar) within the unit is designed as a custom wound gasket (in JB/T4705, wound gaskets of PN6.4 are only available in DN800 size for DN1100). The dimensions are based on the MF sealing surface. During the airtightness testing, the seal wasn’t tight enough; today everything was taken apart and a torque wrench was used to reach 2900 NM (for M42), but it was still not sufficient. Use the big hammer – that should do it. The question is: Is it appropriate to use non-standard gasketing for large-sized flanges? What type of gasket is used for this situation in the ASME pressure vessel standards?
It is recommended to use metal-clad gaskets.
No problem; refer to HG20610-97 (Wound gaskets for steel pipe flanges). Pressure grades: PN1.6Mpa, PN2.5Mpa, PN4.0Mpa, PN6.3Mpa, PN10.0Mpa, PN16.0Mpa. Sealing surface type: A (used for basic tenon-and-mortise surfaces), B (used for internal annular ribbed surfaces), C (used for external annular protruding surfaces), D (used for internal and external annular protruding surfaces).
The container flanges follow the JB/T4705 standard, not the pipeline standard
The gasket itself is usable; it is necessary to check the quality of the gasket, the flatness of the sealing surface, and whether the bolts are tightened symmetrically in a proper manner, or whether the number of bolts is appropriate
These standards and specifications do not prohibit the use of gasketing.
No problem, it can be used as long as the gasket size is appropriate, ensuring a reliable seal; of course, temperature also plays a role.
Wound gaskets can be used; it is recommended to opt for those with better resilience, such as the SU-type wound gaskets produced by Nanjing ** Machinery.
I’ve learned it.* Thank you all for the discussions
It can be used; it seems that no further processing was done after welding
Metal wound gaskets can be used, in accordance with the standard NBT 47025-2012: Specifications for wound gaskets used on pressure vessel flanges