pipingdesign: RE: [PipingDesign] Dear Sir...

From: <Ben>
Date: Tue Jan 08 2008 - 14:25:00 EST

Dear Sabir,
It is best to use pipe schedule 10S as the least thickness for stainless steels up thru NPS 24. This is due to welding fit-up, pipe wall stability (branching, attachments), and product availability. 24" sch 10S is 0.250" nominal thk.

The A672 Gr 60 materials (CC60, CB60, B60, and C60) are listed in ASME B31.3-2006, p. 140. But, B31.3 does not indicate the different classes. Classes 22 and 32 are shown in ASME B31.1 with a joint efficiency of 1.0. It is good to also have access to ASTM Specifications to see detail descriptions of the classes.

Ben

From: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] On Behalf Of knight prince
Sent: Tuesday, January 08, 2008 11:50 AM To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Dear Sir...

Dear Anbarasu,
To consider 12.5% of negative tolerance on pipe wall thickness,divide t(min) by 0.875(1-.125).This will give you the thickness required.Select the next higher thickness available in ASME B36.19. so, t(min) = 0.0479 inch
t(req) =0.0479/0.875 =0.05474 inch
select the next available thickness.

elie altawil <eliealtawil@ <mailto:eliealtawil%40yahoo.com> yahoo.com> wrote: The right answer to your question is to get a copy of "Pipeline Rules of Thumb" or Gas Processors Suppliers Association Handbook "GPSA" gpsa.gasprocessors.com and the type of pipeline sizing you wish to learn; wall thickness, optimal diameter, fluid velocity, pressure drop, etc.

Good Luck.

Elie AlTawil, Sr. Piping Engineer, PE
Consulting Engineer
Denver, Colorado

anbu arasan <anbu_mass@yahoo. <mailto:anbu_mass%40yahoo.co.in> co.in> wrote: Dear sir...
Im S.Anbarasan From Chennai(India)...
Working as a piping Engineer...Sir can you send the std procedure of pipe sizing Calculation...

Regards ...
S.Anbarasan

elie altawil <eliealtawil@ <mailto:eliealtawil%40yahoo.com> yahoo.com> wrote:
I came up with 0.048", however, you must obtain a copy of SS A-358 TP 321, if mill toterance applies to this materials, it should be added to "t". t=tm+c+mill tolerance.

sabirap <sabirap@yahoo. <mailto:sabirap%40yahoo.com> com> wrote:

Hi Gents.is this calculation correct.

PIPE WALL THICKNESS CACULATION Code - ASME B 31.3

Pipe Material - SS A-358 TP 321 CPI Welded

Internal Design Pressure P 5.5 barg - 80 psig

Temperature - 150 0 C - 302 F

Allowable Stress S - 20000 psig

Coefficient (Factor) Y - 0.4

Quality Factor (Joint Efficiency) E - 1

OD of Pipe D - 24''

Corrosion Allowance c - 0

t = PD / 2 (SE + PY)

80 * 24 / 2[(20000 * 1) + (80 * 0.4)]

1920 / 40064 = 0.0479 inch

tm = t + c = 0.0479 + 0 = 0.0479 inch .is this calculation correct.

I tried to search the Allowable Stress - S, for CS A-672 GR 60 Class 22 or 32, Longitudinally Welded, SAW. I couldn't find it in ASME B31.3. Anybody can advice me on this...?

Thank you,

Regards,

Sabir