Pipe with heater jacket over it.
Pipe with heater jacket over it.
(OP)
Hello All, Here is a question for you. We have a 16" std shd pipe, flanged each end and welded to the flanges is bent plate in two semi circles to make a jacket. The inner pipe has sulphur flowing through it, the outer jacket has steam to heat the sulphur. The inner pipe is 10% Rad, and 10% Rad is called up on the jacket as well. In fact the jacket is given all the same requirements as the internal pipe. 10% rad, hydrotest etc. Reality is that it can only be MPI inspected as Rad is impractical, and hydrotest is not really practical due to configuration and air test is too dangerous. My question is, what should we be calling this jacket? as it obviously is not piping, how should we be testing it?





RE: Pipe with heater jacket over it.
RE: Pipe with heater jacket over it.
RE: Pipe with heater jacket over it.
RE: Pipe with heater jacket over it.
The reason I mentioned core pipe collapse is that I have seen it happen, in very expensive stainless steel. An entire pipe system in nitric acid production was destroyed, by hydrotesting the jacket without consideration of the thin core pipe's ability to resist the external pressure.
RE: Pipe with heater jacket over it.
Do you have any idea what a pipe jacket would be constructed as, using ANSI B31.3 and calling it piping does not seem right?
Regards Miked7
RE: Pipe with heater jacket over it.
All our other jacket pipe in this system is CS and we only He test the jacket. We have on occasion used hot Therminol at system pressure to add the thermal effect.
All our components have a 1" connections.
As your jackets are designed to use steam I can't see why using a compatible water source wouldn't be feasible if you set it up to drain. If you are worried about contamination from the test water you could use steam condensate or use low pressure steam to help dry and flush the system after the actual test.
C2it,
We have had several process where jacketed pipe was required and I've never seen any pipe where the core wasn't designed to to take the test pressure of the jacket. This was the reason for my comment. We have a large HNO3 plant on site and use HNO3 in our process to oxidize organics and I too am very leery in pressure testing any component in this service without a very through inspection first.