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Pipe Wall Thickness for external Pressure

Pipe Wall Thickness for external Pressure

Pipe Wall Thickness for external Pressure

(OP)
Hi
However Pipe Thickness is very common but Please let me know the following..
-Simple rule to obtain ratio L/Do where L is Distance between stiffeners and D is external Diameter of Pipe.
-Procedure for thickness calculation for the case when Do/t < 10.
-Why we are using the demarcation of number 10 according to UG-28.

Thanks Experts....

RE: Pipe Wall Thickness for external Pressure

Are you mixing up "external pressure" forces and stresses on a pipe caused by a pipe carrying fluids and gasses less than atmospheric of ground loading, with "excessive pipe stresses caused by improper support design"?

RE: Pipe Wall Thickness for external Pressure

(OP)
No

RE: Pipe Wall Thickness for external Pressure

Quote:

simple rule for L/D ration.
your question is too vague, but ill give it a shot. determine L, and divide it by your diameter.
to find out what L is (i.e the definition), go from B31.3 para 304.1.3 (your topic says 'pipe, so Im assuming B31.3 applies) to VIII-1 UG-28, and look up to definition of L;

Quote:

L = total length, in. (mm), of a tube between tubesheets,
or design length of a vessel section between lines of
support (see Figure UG-28.1). A line of support is:
(a) a circumferential line on a head (excluding
conical heads) at one‐third the depth of the head
from the head tangent line as shown on
Figure UG-28;
(b) a stiffening ring that meets the requirements
of UG-29;
(c) a jacket closure of a jacketed vessel that
meets the requirements of 9-5;
(d) a cone‐to‐cylinder junction or a knuckle‐to-cylinder
junction of a toriconical head or section
that satisfies the moment of inertia requirement of
1-8.

Quote:

Procedure for thickness calculation for the case when Do/t < 10.

refer to VIII-1 UG-28 (c)(2)

Quote:

Why we are using the demarcation of number 10 according to UG-28.
Dont know. Ask the code committee. Read books on pressure vessel design, maybe they will tell you.

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