PIPING STRESS ANALYSIS BS7159 1

[PIPING_DESIGNER]

I work on stress abalysis of a GRE piping system.
the analysis will be performed according to BS7159 ON CAESAR II.
T= 85°C
P= 9bar.
I need to know the value of SH1 as indicated below:

What is the name of SH1 in the mechanical properties of the GRE material ?

which property is SH1

 

[LittleInch]

I think you need to ask the supplier.

GRE is strange stuff when it comes to stress analysis and each vendor does it differently.

What does ceasar say?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[PIPING_DESIGNER]

According to the mechanical property, which value is SH1 ?

 

[LittleInch]

I don't know.

But this is a caesar input file so I think you need to look at the caesar help or post it in or search in the caesar forum. Look under engineering computer programs.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[desertfox]

Hi

SH1 etc are the hot stresses for the material you are using see this link

https://docs.hexagonppm.com/r/ru-RU/CAESAR-II-Users-Guide/Version-12/335732

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[PIPING_DESIGNER]

I know that SH1 is the allowable hot stress. but, how can I find the value from the table of mechanical property.

 

[MJCronin]

I think that he is getting really, really angry .... better give him what he wants !

MJCronin
Sr. Process Engineer

 

[LittleInch]

Ask caesar.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[PIPING_DESIGNER]

Who know the answer ?

 

[LittleInch]

Did you follow the link supplied? This is what it says.

"BS 7159

Design stress sd in the longitudinal direction as defined in Section 4.3 of the code (σd =Σd * Elamx). Specify design stress in the circumferential (hoop) direction by typing the ratio of the circumferential design stress to the axial design stress in the Eff box. Because design strain should be the same for both directions, the value in the Eff box is also the ratio of Elamf(hoop) to Elamx (longitudinal)."

So find the value it points to - looks like axial stress figure to me but check the code. Note there are different figures for compressive and tensile stress.



Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[RVAmeche]

Your table is mechanical properties. I don't see allowable stresses at elevated temperatures (which is what SH1 is) shown.

As others have said, you need to ask the supplier.

 

[MJCronin]

I wouldn't mess with him .... He is growing more and more angry !!!

Perhaps he may turn violent ?????

MJCronin
Sr. Process Engineer