Help! Friction flange – regular cracks appear during testing!
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Flange: HG/T 20615; Sealing type: WN-RF; Size: 24"; Wall thickness: 28 mm; Pressure class: CL600; Pipeline medium: 80–90% H2; Pressure: 5.0 MPa; Temperature: 40°C; Location: A matching flange connected to the vertical separator tank, located in front of the inlet to the reciprocating machine.
What’s the reason? Please have an expert analyze it!
Material reasons, welding quality, stress – these are probably the factors at play
Corrosion is practically non-existent; in my opinion, either there is a problem with the welding, or the stress calculations are insufficient or not properly addressed
This is a flange with a neck for butt welding; it seems like the position of the weld seam isn’t right. With such large-scale cracks, consider the stress factors
I think stress is the main cause——in my company, there are regular cracks on the weld seam and flange neck of the 4MPa, 450°C, DN350 double-reduced flange; the severe pipe vibration is definitely related to stress
It’s split so neatly. . . . Is it that there isn’t excessive R at the butt-welded ends of the flange neck? . . It is mostly caused by operating conditions. . This weld is poor too. .
Even for stress, I’ve never seen it so uniform I think the issue is more likely to be with the base material.
This is just a test drive; there are always potential risks whenever driving officially in the future
This weld is really poorly done – what kind of welder is this?