Low temperature limits of ASTM A-106 Gr. B Pipes

[zebmahar]

What is the minimum allowable temperature for use of ASTM A 106 Grade B. Can ASTM A 106 grad B material be used in -10 C

Waiting for response

Kind Regards
Jahanzeb Mahar

I have edited by post to make it correct "Maximum" was written by mistake. Basically i need help to know what is the minimum operating temperature of ASTM A-106 Gr. B pipes.

 

[DSB123]

What is the question?
You mention Low temperature limits in heading but ask "What is the maximum allowable Temperature for use of ASTM A106 Grade B"

 

[DVWE]

zebmahar,

Generally speaking, ASTM A106 Gr B is acceptable for use down to -29C (-20F).

However, many factors need consideration:

1. Code of Construction
2. Thickness of material
3. Pressure
4. Service considerations

 

[curtis2004]

Are we talking about Minimum or Maximum temperature?

 

[Ehzin]

I think he's maybe asking for both. Maximum in the first sentence and then the second sentence reiterates the title. Or "Maximum" implying most extreme negative value. A stretch but either way with a little clarification and the answers fairly straightforward, assuming the items DVWE mentioned can be answered.

Thanks,
Ehzin

 

[weldstan]

Per B31.3, for thinner materials, it can be used to -20F; however, as thickness increases the minimum temp is incressed in accordance with the Curves therein. But do not be surprised if the A-106 purchased does not meet the 15/12 ft-lbs absorbed energy at -10C, whatever its thickness.

 

[GD2]

Zebmahar,
A106 Gr. B pipe is normally used upto -29C (-20F) without impact testing per B31.3 Code. As you increase the wall thk, the MDMT will increase. You can even go upto -104C on certain conditions of stress.

If you are also asking about the max temp limit, it can be used upto 593C but the thickness will be much higher for the same normal stress (hoop stress) as the yield strength of the material will decrease fast with temp.

Ganga D. Deka, P. Eng
Canada

 

[georgeverghese]

Also check your company engineering standards - company standards I'm familiar with are more conservative than B31.3 and require impact testing certification by the supplier if the desired lower design temp (LDT) is less than 0degC for thin wall pipes, and even higher than 0degC for thicker wall pipes.