Let’s take a look and see if this type of sealing surface needs to be treated
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Gas pipeline, operating pressure 63 kg, dn600.
Of course it needs to be dealt with; the flange standards specify requirements for the sealing surfaces
It’s not that difficult to handle; just go ahead and handle it
It needs to be dealt with; it will cause trouble if it gets leaked
It’s recommended to take action; it’s almost through. If a leak occurs due to high pressure, operations must be stopped for repairs, which is very troublesome. The component has already been disassembled on site, so just deal with it. If you don’t deal with it and keep worrying about it, even if there’s no problem, you’ll still be concerned.
What kind of mat was installed before? Judging by its appearance, it seems to be an asbestos pad that was installed in the past. If so, the sealing surface can be scraped clean and a metal wound gasket can be installed.
This should be dealt with. The defects in the flange sealing surface are subject to certain requirements; this one has exceeded the standard values.
I don’t see where there are any missing items; I only notice rust. Flanges of this size should be treated properly, and they need to be protected during installation
I only see rust; it needs to be dealt with
Under such high-pressure conditions, it is advisable to treat the sealing surfaces of the valve after long-term use