Octagonal pad problem?
Thread Content
The diameter of the container equipment is DN5600, with a design pressure of 0.8 MPa and a design temperature of 510°C. The main material used for the equipment is 14Cr1MoR; the material for the flange forgings is 14Cr1NoⅢ. I would like to ask everyone what material would be suitable for using as the octagonal gasket
GB/T150 specifies that the hardness of the gasket ring should be 30-40 HBW lower than that of the groove
This GB150 standard specifies relevant requirements; so which material is appropriate to choose? 14Cr1MoⅢ should work fine
The hardness should be about 30 HB lower than that of the sealing surface
The poster, you’re not performing surfacing on this sealing surface; generally, TP309L and 3TP347 are used for surfacing, while S30403 material is used for the octagonal gaskets.
Should containers over five meters in length be joined using flanges? What kind of device? Generally, S30403 is sufficient for 14Cr. But with something this large, the sealing issue is serious
May I ask why the seal surface of the original poster needs to be surfaced?
I’d like to ask everyone: for a diameter of 5600, and with heat treatment requirements as well, where can one find a furnace large enough for that?
You can ask Fulaixi and Aizhi about the problem with the octagonal pads. The furnace is fine; all large forging factories have them. If it’s too long, it needs to be divided into sections
Also, OP, although the pressure here isn’t high, using just an octagonal gasket is likely to result in leaks; it’s better to add a disc spring, but using both an octagonal gasket and a disc spring increases the cost significantly. It’s best to consult the sealing manufacturer
How can I ask Fulaixi and Ai Zhi? I don’t even know who they are