Is an spiral gasket suitable for DN800 300LB container flanges?
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The gasket design for the flange DN800 300LB of the device’s container is standard; it is a wound gasket of SHI1ASMEB16.20 size, designed for RF sealing surfaces. The design pressure is 4.2 MPa, while the test pressure for the pipelines is 6.0 MPa. During the hydrostatic testing, slight leakage occurred at 6.0 MPa; the pressure could be maintained at 5.5 MPa, but it was still not sufficient. Has this pressure been passed? Discussion: What other gaskets can be used with ASME B16.47 flanges to ensure reliability? This post was last edited by scholar on 2009-4-5 17:33]
What a joke – it’s supposed to be a CLASS 300 pressure rating; PN300 refers to a pressure of 3000 kilograms. If it’s CLASS 300, using gasketing is still acceptable.
Metal wound gaskets can withstand pressures of up to 2500 lbs (42 MPa) for DN800, and 300 lbs (5 MPa); the design pressure is 4.2 MPa while the water pressure is 6 MPa. Using this type of gasket is not suitable; a gasket with a capacity of 600 lbs should work fine. 150 lbs corresponds to 2.0 MPa; for DN300, it’s 5 MPa; for DN600, it’s 11 MPa; for DN900, it’s 15 MPa; for DN1500, it’s 26 MPa; for DN2500, it’s 42 MPa; and for DN3500, it’s 59 MPa