Pressure-bearing leak sealing welding process for stainless steel pipes
Thread Content
The stainless steel pipes passed the pressure testing; after a few months, they were purged and also passed the leakiness test. Why does a large-scale leak occur after feeding the material? The leakage locations are mainly distributed in the weld heat-affected zone. The leakage point is a conical-shaped deep hole, larger on the outside and smaller on the inside. We are now preparing to seal the leak. The medium is a polyol, and the design pressure of the pipeline is 0.6 MPa. Is it feasible to use sleeve tubes for leak sealing? For welding, intermittent welding with a low current is used; so how should the current value be chosen? Please, experts, give me some advice
:L:L:L:L:L:L:L:L:L:L:L:L:L:L:Top tier
Personally, I think it’s not a welding issue but rather a material problem. There are many methods for sealing leaks online, such as wrapping, injecting glue, and so on
Spectral analysis was conducted before construction, and it was found to be qualified.
Plugging leaks under pressure; the medium is flammable and explosive. The client requires plate welding, and is 60A a high current for welding?
To be honest, the current level needs to be adjusted depending on factors such as the material and pipe thickness. It is recommended to conduct experiments on pipes of the same material and diameter first, to determine the appropriate current level, and then proceed with welding on the pipes that are leaking. For flammable and explosive pipelines, as long as a slight positive pressure is maintained (negative pressure is strictly prohibited), by standing upwind and taking proper protective measures, there are generally no problems. You could consider making a pipe clamp with glue injected in the middle; it’s simple and safe.
We thought the same, but the property owner disagreed.
The leakage issue shows up late; it’s causing a lot of trouble. What should I do?
This post was last edited by dmz329227 on 2018-10-16 at 11:33; after all, the medium is a polyol, which is flammable and explosive； Effective measures such as explosion prevention and gas protection must be taken during the welding process ； Using sleeves for protection is not a major issue, but it does not address the root problem; if welding still poses problems, corrosion and leakage in the pipes inside will continue to cause damage to new sleeves within the new insulation layers ； Therefore, it is advisable to seal the leaks first before installing the casing ； Make a few small molds, apply anti-corrosion glue to seal the leak points first, and then carry out the sleeve installation – this will yield better results