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  1. John7474

    FORCE REQUIRED TO SQUEEZE IN AN OVERSIZED SEALANT (BUNA N ELASTOMER) IN A PIPE

    I am designing a jack screw. It pulls and pushes a pivot head inside a pipe. The pivothead is basically a piston with sealant around it. The pivot head is smaller than the pipe, but the sealant is slightly larger than the pipe. The jack screw basically pushes the pivot head with the sealant...
  2. John7474

    NACE MR 0175 Material Compliance

    I want to know if the following materials are NACE MR 0175 compliant, These are used to make fittings, equipment or accessories that are used for hot tapping. All of the products would be in contact with the H2S. Thanks in advance. Pipe Cutter body, back plate,and holder 1. SA 283 GR. D 2...
  3. John7474

    Temperature Limitation to Liquid and Gas piping

    I would like to apologise before I start my question again. I had asked this question in my other post in a different section. Please pardon me if this is a violation. The temperature derating factor provided for ASME B31.8 stops at 450'F. Does this mean that gas piping ( B31.8)can be designed...
  4. John7474

    Yield Derating table simialr to ASME Sec. II-D ?

    Please pardon me for an unclear qustion. Does ASTM have anyting that is similar to ASME II-D, but for yield values ? Thank you.
  5. John7474

    Temporary or Permanet Fittings Categorisation by Codes ?

    Is there a formal temporary or permanent categorisation of fittings by ASME or DOT ? Temporary fittings being the adapters or valves that would be attached to the pipelines for operations like hot tapping. They would be bolted for the operation and taken off once the operation is complete. Is...
  6. John7474

    Bolt hole depth on a pressurised flat plate

    BACKGROUND I am usiing ASME VIII-1 UG 34e to desing a flat plate wchich attaches to the end of a flangeg spool. The flat plate bolts to a weld neck flange (WNF). In the aseembled state, there is a stud which slides through the bolt hole of the WNF. A nut tightens on the side of the WNF...
  7. John7474

    API Operator Qualification

    I have a document which compares ASME B31Q and API. It does not say which specific API code. I tried googling got nowhere. ASME B31Q API 1081 40.6 1091 40.7 1111 40.8 1131 40.9 I know what ASME clauses mean.It is provided in...
  8. John7474

    30 GPM pump vs 20 GPM pump

    I have a hydraulic power unit which is a very basic design that there can be. A hydraulic motor is being driven by a hydraulic pump. The pump is being run by a diesel engine. There is a factory set pressure releif valve set at 1100 psi. There are regulatory , bypass and emergency shut off...
  9. John7474

    Vertical Travel of a projectile

    I have a threaded bar which could act as a sealed plug being forced vertically out due to pressure. F = x-section area x pressure I think I can calculate the initial accelaration as per, F = ma - mg I am trying to find its maximum vertical travel.
  10. John7474

    Minimum Detrimental Pressure

    What is the minimum pressure that could prove srious and harmful in a fabrication/test shop environment?
  11. John7474

    Hot Taps: Test Vessel Vs. Field Operation Issue

    My hot tapping cutter actuating drive stops after 700 psi although the machine is rated for 1480 PSI. It works fine at STP. It also works fine in the field under pressurised condition. Any suggestions?

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