With a working pressure of 2.2 MPa and a temperature of 220°C, can plate flat-face flanges with PL, FM/M male/female sealing surfaces be used?
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This post was last edited by FORREST_GUMP on 2016-12-6 at 16:37. Dear experts, the operating pressure of the container is 2.2 MPa, and the operating temperature is 220°C. For the pipe flanges: (1) Can plate flat-weld flanges with FM/M male and female sealing surfaces be used? According to HG/T20592, the PL-FM/M flange type can be chosen, but I wonder if there are any users who have used this type of flange? (2) Can only the welded steel pipe flange with a neck, WN, be used? In this case, can a raised face RF be used for the sealing surface? Thank you all.
Choose a welded flange with a neck; the sealing surface can be of RF type. The pressure rating should take into account the effects of temperature, so consult the flange standards.
NBT 47020-27-2012
Thank you; I didn’t make it clear before – I’m referring to pipe flanges.
The effect of the medium needs to be taken into account...
It is recommended not to use PL.SO; WN would be safer. The sealing surface can use RF, but the gasket must be an external-ring metal gasket
It depends on the medium; those that are explosive, highly toxic, or extremely toxic are handled in accordance with volume regulations using WN
In HG/T20592-2009, plate-type face weld flanges (PL) do not have raised and recessed surface seals; only RF and FF types are available； Only SO and WN have MFM, right?
What is a medium? The influence of the medium is also significant.
For those that are explosive, highly toxic, or extremely toxic, WN is used in accordance with volume regulations; for others, SO can be used