The issue of substituting steel pipe specifications in manufacturing plants
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The last edit to this post was made by prt0683 on 2010-6-2 at 20:30; the specification indicated on the drawing is for steel pipes with dimensions φ114.3X11.13, which are in American standards； Is φ114.3X11 (domestic imperial pipe specification) suitable for use in manufacturing plants? Does it seem a little thinner? Thank you!
Although it’s a bit less, it’s best to go through the design process and use a substitute instead
Well, it’s best if it passes the design review, but communicating with the design institute is too troublesome. .
The title of this post doesn’t meet the standards, I guess; some moderators give points, some reply, but no moderator takes care of it.
Doesn’t the pipe also have a negative deviation? Check if it’s within the range. To save the trouble~
I’m not sure how the procedural documents or manuals are formulated in your organization; in situations like this, our quality assurance engineers can provide their approval, but only if your procedural documents include provisions such as \"the substitution of non-primary pressure-bearing components requires the approval of a quality assurance engineer.\"
I work at a design institute; there’s no problem with it. It can be used as long as the materials are the same
In most cases, it is possible to do so. There may be variations in the wall thickness of the pipes, but as long as the minimum wall thickness of the pipes supplied does not show a negative deviation, this is mainly due to issues arising from the unit conversions between American standards and Chinese standards. In general, it is possible to replace such pipes. This is also because domestic design firms tend to leave a larger margin when designing. However, if it is foreign design firms involved, then changes cannot be made arbitrarily; of course, you can also consult the design firm in question.
I think first, a calculation for reinforcement through drilling is necessary; if that calculation is approved, it still needs to go through the design institute, and the manufacturing factory must issue a material substitution form, which must be signed and stamped by the design institute to be valid.