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  1. TXLSUCHE

    Can you control centrifugal pump flow with a flow meter?

    Thanks for your responses. I realized last night (I'm definately not an electrical engineer) after I had posted the thread that VFD's do have flow calculation capabilities. I have not been able to find any discussions on the internet concerning the use of a flow meter to control the discharge...
  2. TXLSUCHE

    Can you control centrifugal pump flow with a flow meter?

    I have seen many threads concerning the use of control valves on the discharge of centrifugal pumps or VFD's to control flow, but none of them fit my particular case. I am designing pumps that will send oil into a pipeline which could vary substantially in pressure. Several articles that I...
  3. TXLSUCHE

    How close is too close? Tensile vs. Yield

    Stone, The piping is on a Gulf of Mexico oil & gas platform. The shut in pressure of the well is 8900 psig, so the piping is being designed for 10,000 psig. It will probably never see that high of a pressure because of pressure safety devices, but the piping needs to be designed for that...
  4. TXLSUCHE

    How close is too close? Tensile vs. Yield

    Thanks JStephen. To answer your questions: 1)The code allows you to use an unlisted material if it has an associated spec that governs it (i.e. A519 in this case). 2)Material is weldable and there are existing qualifications and procedures. 3)Pipe is to be hydrotested to 1.5 times. If I...
  5. TXLSUCHE

    How close is too close? Tensile vs. Yield

    Thanks metengr for the response. I understand your explanation of Chapter IX. Unfortunately, 4130 (A519) isn't listed in Table K-1. If I compare the other Cr-Moly materials for tubing that are listed in the table, I see that the allowable stress for <100 F are calculated using 2/3 the Y.S. I...
  6. TXLSUCHE

    How close is too close? Tensile vs. Yield

    I am considering using some 7" OD x 1" W.T. 4130 tubing for a 10,000# piping application. The T.S. is 109,000 and the Y.S. is 93,000. Is there a disadvantage of having the T.S. and Y.S. this close together? That is the only thing I can see that could be detrimental, but I'm not a mechanical...
  7. TXLSUCHE

    B31.3 Allowable Stress for High Pressure Piping

    Thanks for the response ijzer. But what worries me about that is for higher pressures, the safety factor is actually decreasing because 2/3 yield is greater than 1/3 tensile. The pipe I am considering (I have the MTR's) is 7" OD x .9375 W.T., 4130, 104,600 TS, 80,900 YS. As you can see, which...
  8. TXLSUCHE

    B31.3 Allowable Stress for High Pressure Piping

    I am calculating the W.T. for 7" OD 10,000# prssure piping using 4130 mechanical tubing. Unless I am misunderstanding B31.3, Section K302.3.2, it appears that it is acceptable to use 2/3 the SMYS for the allowable stress. However, everyone I have conferred with uses 2/3 the SMYS or 1/3 the...

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