Sounds like anything can be done. Two horizontal welds spaced 1 or 2 inches apart are not too close together? Please reference the codes so I know what inspectors look for as far as a well constructed vessel. What NDE, preheat, or PWHT would be required by the codes for such a repair of 40 mm...
Say the upper course was incorrectly positioned relative to the lower course.
What would be an acceptable procedure to make this right? The original misalignment was accepted by the purchaser, but the purchaser now wishes to have it corrected.
For example, let's say an entire horizontal...
What is the procedure to correct misalignment of two courses in a vessel? Can the weld be cut open and redone, or does material on both sides of the circumferential weld need to be removed? The misalignment occurs where a 40 mm thick course butts to a 35 mm course. Where is this type of...
I have a 12 foot diameter penstock made of 3/8" thick plate. The penstock shell is exempted from PWHT since the plate thickness is less than 1.25" thick and carbon content is less than 0.3 per cent.
However, at the bifurcation where the pipe splits, a 2" thick stiffener (a T-shaped stiffener)...
Thanks rconner, this seems a good answer to the question I had. A min thickness of t=(D+20)/400 (pipes over 54" dia) recommended in the Steel Water Pipe AWWA M11 gives a formula based approach for handling.
I find it curious and somewhat unfortunate that the piping code B31.1 doesn't point...
Thanks all,
The pressure is low and does give this very thin wall thickness.
the pipe is not buried. there are probably handling forces that should be considered, but what calculations are applicable? I'm trying to get to a thickness where I can be comfortable that handling will not pose a...
This pipe will not always be under pressure. Is there a calculation that can demonstrate the need for a thicker wall? My question is genuine, and I'm looking for a formula based calculation/approximation that will show the wall needs to be thicker than .06 inches.
Hoping for some insight on...
Hello,
This is my first post and my question is trivial. I am trying to determine the minimum practical thickness that can be used for a 96" diameter pipe (longitudinal weld seam) with a very low pipe pressure(23 psig) and the fluid is just air.
B31.1 min thickness to meet the low pressure...
