Since the light tube has no threads and cannot be welded, hydraulic pressure is required; how should the tube ends be sealed?
Thread Content
Dear teachers and experts, I currently have a device equipped with numerous connectors, whose specifications are 114.3, 48.3, 26.7, etc. These are all straight optical tubes; they lack flanges or threads and cannot be welded. A hydrostatic test is required now, with a test pressure of 0.2 MPa. How should the tube ends be handled for this test? I would appreciate it if you could give me some advice
The pressure is not high; two flanges can be used – one flange is placed on the outer circumference, and the other is positioned at the end (sealed with a rubber gasket in between). The flange on the outer circumference is secured to the outer surface of the pipe using several bolts, while the two flanges are tightened together with bolts.
Leave some margin for the pipe, increase its length slightly, and then weld it. The hydrotest is done; cut it off.
Do you mean that a flange is connected to the outside of the pipe using bolts, a flange cover is installed at the end of the pipe, and then the flange and the flange cover are tightened together with bolts to create a seal?
It’s just an ordinary tower vessel; the protruding pipe has no flanges – it’s a bare pipe without any threads either, and it cannot be welded. How can such a pipe be subjected to a hydrostatic test?
We have used hoop-type seals in the past, but the results were not good – the bolts couldn’t be tightened enough to achieve a proper seal, and when the bolts were tightened, the flange below would move. I’m wondering if there is some kind of inward-expanding sealing mechanism available for the pipe ends
O-ring, with a shallower groove depth. When the pressure plate is tightened, it clamps around the pipe.
Can’t the take over be welded because the equipment has undergone heat treatment?