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  1. pstress

    B31.8 sour service stress range

    ASME B31.8 Chap IX for sour service asks for compliance to NACE MR0175, presumably because following the rules for hardness etc. in that standard will keep sour service lines safe. Note however that Section 833 of the Code recognizes the 'stress range' approach as acceptable. This approach is...
  2. pstress

    Square Tank Standard

    The tank contains drilling fluids and client wants it square. I think I will go with UL-142. I dont have a copy but I will track it down. Great answers, everyone. Thanks.
  3. pstress

    Square Tank Standard

    Good points. Bonswa - would be interested if they designed and built it to a code.
  4. pstress

    Square Tank Standard

    Thanks, good point. Perhaps I'll tell them to use ASME VIII, Div.1, App. 13 for the pressure design of the shell. Since ASME VIII doesnt cover alot of atmoshperic tank related design issues, perhaps I'll tell them to use API 650 as a guideline for welding, nozzle details, and QA/QC....what do...
  5. pstress

    Square Tank Standard

    I am preparing a data sheet and specification for square carbon steel tanks. Tanks are about 4000 gallons and are used on an oil rig. Does anyone know what an appropriate Standard would be? API 650 probably does not really apply since it is for cylindrical tanks.
  6. pstress

    API 560

    I am developing a specification for a waste heat recovery unit (fined tube heat exchanger system) for a gas turbine exhaust. I was thinking of using API 560 as a basis for this specification. API 560 is intended for direct fired units in refineries but this application is neither a direct fired...
  7. pstress

    Piping Loads on Rotating Equipment

    Thanks for all your responses. I have found them interesting. My question about nozzle loading actually revolves around 'real world' concerns initially raised by 'johnp' above... If I have a situation where the nearest support to the nozzle is, say, 5'- 10' away, the stress analysis program...
  8. pstress

    Piping Loads on Rotating Equipment

    When evaluating the piping loads acting on rotating equipment, I look at the G+T+P (Gravity + Temperature + Pressure) load combination and compare against the allowable loads permitted for that equipment. I also check the T+P (i.e. no Gravity) case. It is possible that T+P can be greater than...
  9. pstress

    Flange Bending Moments

    I have a few points about the flange moment calcuations: 1. They seem potentially time consuming. I wonder if most piping stress engineers actually do this calculation for each line. 2. The methods seem generally conservative. They could mean expensive and unnecessary re-design of piping...

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