For the renovation of the fire dike, can the sleeve be cut in half and then installed?
Thread Content
The fire dike needs to be modified. There is oil in the original pipeline that runs through the wall; it isn’t planned to remove that pipeline, but the casing needs to be replaced. It is considered possible to cut the new casing in half and fit it over the existing pipeline – is that feasible? Also, can a 200 diameter sleeve be used for a 100 diameter pipe? Can it be sealed tightly? Please give me some guidance.
I don’t understand; I’m just talking nonsense. Does the poster want to make a double-layer tube? The longitudinal welds where the outer tube has been cut also need to be welded, and in addition, it is necessary to maintain concentricity between the inner and outer tubes. Think about it again – how far is appropriate to build the fire dike?
Yes, a double-layer casing is needed. Due to the thickening of the fire dike, the original casing was not long enough; moreover, the original casing was severely corroded. To add another layer of casing, it was necessary to cut the new casing and fit it on. As you said, does welding have an impact on the oil pipelines inside the casing? I know that during welding, the flame penetrates the steel pipes being welded, and with a high welding current, isn’t that quite dangerous?
One more question: the sleeve is generally one size larger than the inner tube. For a 100-sized tube, a 150-sized sleeve is usually used; however, the contractor is using a 200-sized sleeve here. Will this cause any problems with sealing? Are there any regulations prohibiting such use?
Why is there a flame in welding? If you insulate the original pipes with thermal insulation material or fireproof blankets and control the welding temperature, it should help reduce potential risks, but I’m not from this industry, so I can’t guarantee that there will be no problems.
I work in ocean engineering; I don’t know anything about land. But as long as the casing is larger than the inner tube and allows for welding and maintenance, there shouldn’t be any problem, right?
It is generally not allowed for pipelines to pass through the body of a fire dike; if passage is necessary, sleeves must be embedded in advance, with a tight connection between the sleeves and the dike structure. Recently, the whole country is carrying out efforts to address safety hazards in tank farms; why not take this opportunity of renovation to move the pipelines that pass through fire dikes underground? Personal advice: safety first.
The sleeve is quite large, resulting in a significant gap with the inner tube – this gap amounts to 4 cm. Can it still provide an effective seal? The flame-retardant seal is usually made of asphalt-asbestos cloth; I plan to use waterproof and impermeable material to seal the inside of the sleeve, with asphalt-asbestos cloth being used to seal both ends of the sleeve
Thank you, your point is good
4 centimeters, that should be about right; I’m not sure if it will work though. :handshake
This type of construction is extremely dangerous; the key issue is arc discharge. Oil pipelines contain flammable substances such as oil and gas, so it is not advisable to perform welding work directly outside the pipes! ! ! ! ! ! ! ! ! ! ! !