Codeeng, you are right that 30F is the margin to take care of the higher stress at hydrotest. I am only curious to know the basis for this value 30F. My question is why 30F, why cant 20F or 40F. I am sure the Code must have had some basis in arriving at this margin 30F. I only want to know what...
Thanks codeeng! But what is not clear how did they arrive at this value of 30F(17C). Of course it is given in UG-99(h). But what is the calculation basis for this. Thanks.
In regards to calculating the coldest recommended metal temperature during hydrostatic test, I am not able to interpret the general note (6) given for fig.UCS-66.2. It does refer to UG-99(h)which is clear, but the basis for arriving at 17 deg from Fig-UCS-66.1 is not clear. Could somebody please...
Clause 302.2.2 in ASME B31.3 states that "...piping component having same allowable stress as the straight pipe shall be rated using not more than 87.5% of nominal thickness of seamless pipe..." - I would like to know the exact interpretation of this. Does this mean the thickness of pipe...
Hi TerryOsser
Thanks for your immediate response. Writing a specific addendum requiring a lower tolerance is a good solution. But in doing so, there is a strong possibility that you will end up paying more for the fittings as these are made to order and may not be available off the shelf. I want...
Hi Everybody
I have a question on the tolerance you apply for pipes and fittings of size greater than 24". The mill tolerance on pipes and fittings upto 24" is minus 12.5%. But for sizes >24", invariably they are rolled from plates and so the thickness tolerance is not always...
