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sachin_rastogi_in
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Join Date: Jul 2008
Location: India
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Temperature and PR Limits

12/17/2008 9:28 PM

Spec calls for : Cl 150 RF , S 31803/32205 Duplex SS , 0.063" CA , DSS Trim ( NACE Complt ) Design Code : ASME B31.3 Pipe MOC : DSS A 790 - S31803/32205 Seamless / EFW Large Fit MOC : DSS A 815 – S31803/32205 Small Fit MOC : DSS A 182 – F 51/60 T & Pr lts : -20 to 600 F @ 290 to 140 psig ( max ) as per B16.5 Grp 2.8 Service : Blowdown , Acid gas , Sour water However if I look in ANSI B 16.5 for DSS A 182 – F 51 , T & Pr lts are 100 to 600 F @ 290 to 140 psig . How can I see the limits for -20 to 100 F ? Thanks in advance

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Anonymous Poster
#1

Re: Temp & Pr limits

12/18/2008 8:55 AM

What kind of product is this?
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Guest.
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Join Date: Dec 2008
Posts: 130
Good Answers: 17
#2

Re: Temperature and PR Limits

12/18/2008 10:33 AM

Check B31.3 allowable strengths Table A-1 (page 160 - 2006) and run them through paragraph 304.1.2

(I gave the cop-out answer because I am at "busy" at work and don't want to make a stupid mistake like I did to your last "min wall thickness" question and I can't really decipher your question/determine your problem [isn't the answer to your question in your question already?] )
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Guest.
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#3
In reply to #2

Re: Temperature and PR Limits

12/18/2008 1:32 PM

............... see, there I go again - not fully reading the question/mixing up my standards/codes. You are asking B16.5 flanges and not B31.3 piping.

You are right - it is interesting that they left out/missed (it looks like a typo) the -20F rating in the 2.8 table for imperial units. However, if you look at the metric units for 2.8 materials they have noted -29C to 38C. So I would just convert the metric units - which works out to be 290psig from -20F to 100F anyways.
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srini
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Join Date: Mar 2008
Location: Houston, Texas
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#4

Re: Temperature and PR Limits

12/19/2008 10:44 AM

Below 100 deg ,upto -29 deg the pressure rating is the same as listed for 100 Deg F

For example for 150# ANSI steel flange the listing is as follows

-20 to 100 Deg F 285 Psig.

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