question of pipe welded

[javad64]

Hello
I want to know if we have pipe welded ( not seamless) who can I calculate max temp. and max pressure that pipe can resistance with different fluid ?
Thank you

[ashfaqanwer]

Two different things you are talking about.

For different fluid type, you first have to choose the right material and then to handle the temperature and pressure of the fluid.

Considering applicable code is ASME B31.3, calculation of maximum temperature it can bear depends upon the allowable stress and then calculating the pressure design thickness value.
See allowable stress values tables given in ASME B31.3 and then calculate your pipe thickness considering longitudinal weld quality factor for your welded pipe.

Hope this would help.

Regards,
Ashfaq Anwer

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[pankajjadhav]

If you are talking about ASME B31.3 code for solving urproble, the following steps you need to follow:

1. Get the FluidList(Fluid Index)from Process Dept. for categorizing the Fluid in Category D/ Category M or Normal Fluid Service

2. Define the Piping class Say for ss & cs piping items(Basic MoC is defined in Fluid Index & temp, Pressure & service conditions)

3. Go through the Thickness calculations(Tmin=pd/2sew+py)+c

4.Consider Manufacturing tolerance & get the Nominal thickness as per the market availability considering ASME B36.10 & B36.19 standards


5. This is about thickness cals. based on internal pressure.


6. If piping system is under Vacuum then follow ASME section VIII div. 1 UG28 through 30

7. If you get the thickness in the first place itself then apply pipe thickness calculatrion formula & get the Maximum allowable working Pressure

Hope the above will suffice


Thanks