【Haichuan Pipeline Installation】Is it okay to weld the flanges in this way while connecting the valves? What problems are likely to occur?
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Why weld the pipes in this way
Easy to adjust in size and convenient to use!
Socket welding, 15BL flanges; only simple on-site welding repairs are permitted. Direct welding of newly installed pipes is strictly prohibited
It’s probably to ensure that the pipes and valves are coaxial, thereby avoiding the generation of radial loads
It appears to be a water pipe, but even water pipes should have the pipe isolated from the equipment in a blind manner； The working environment is both a confined space and a high-altitude work site, with inadequate safety measures in place.
Doing this will subject the valve to stress, which is generally not allowed.
I don’t quite agree; generally, a plumber can first prepare the flanges according to the principle of placement at the mid-span
The working environment conditions are indeed not very good
Why is it strictly prohibited? What are the harms?