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Recent content by themad1

  1. themad1

    Valve Packing Pressure/Friction

    We use an empirical formula as an indication of the final friction force in needle valves. The result is always pessimistic than the output from the prorotipe test. F = Q * µ Where: F = friction Q = load normal to the contact surface µ = frictional coefficent - for graphite of polished steel...
  2. themad1

    Fire Test Certificate for a replacement gasket

    I hade exactly the same concern with mechanical rotary seals. You are right: the gasket does not make the valve fire safe. It depends on the design of the valve and also on the material used for the gaskets. The scope of API 6FA is "..to establish the requirements for testing and evaluating...
  3. themad1

    Initial Test Service in lieu of Hydrostatic Test ASME B31.1

    Never happened. Pneumatic test can be used as alternative of hydro test only if done as required by ASME B31.1 par. 137.5 But Pneumatic tests are potentially more dangerous than hydrostatic so you must to go through a adequate risk assessment. Low pressure test is done as a means of locating...
  4. themad1

    Initial Test Service in lieu of Hydrostatic Test ASME B31.1

    Hi. I personally had experience in many commissioning of natual gar tratment plant for power stations. Before to test hydrostatically the piping welded on field we usually made a low pressure test using air at maximum 6 bar increasing pessure in step of 2 bar with a leak check on weldings on...
  5. themad1

    High pressure tubing

    I'm searching information about High pressure stainless steel tubing. I mean tubing with a maximum working pressure from 15kPSI to 60kPSI and a OD/ID ratio from 1.5/1 to 3/1. I went through the main manufacturers of this tubing searching for information about code of calculation without...
  6. themad1

    Instruments valves and manifold history

    Very interesting! Thank you for your kind answer. D
  7. themad1

    mating valve with the pipe of different class

    Is a no-no to put in a pipeline a component whith flanges having different pressure rating than those of the system in which it is assembled. Even if the rating of component is greater than the line. If this where allowed so we could use only 3 pressure ratings (300-900-2500) and than flange...
  8. themad1

    difference between MOV & ROV

    Assumend that MOV is the acronym of Motor Operated Valve and ROV means Remote Operated Valve. While ROV ia s generic term used to indicate an actuated (pneumatic, electric, hydraulic or other) valve which may be opened or closed from a distance by means of electric signal, MOV indicates a valve...
  9. themad1

    Instruments valves and manifold history

    Hello everybody! We are currently writing some “white paper” regarding manifold and instrument valves and we are searching for information about their history, operation, final application etc. Surfing on internet is very hard to find such information. No one has indication about how to choose...
  10. themad1

    High pressure stainlees steel tubing Maximum Working Pressure Vs. Bend radius

    Ok, now I start to understand! But my problem now is that I'm working with pipes MAWP from 10Kpsi to 60Kpsi and a t>D/6 If I got right I shall use ASME B31.3 chapter IX par. K304.1.2 for wall thikness calculation (or MAWP) Is Paragraph 304.2.1 still applicable? No longer I think...
  11. themad1

    High pressure stainlees steel tubing Maximum Working Pressure Vs. Bend radius

    Hello everyone! We are facing a new challenge in our company. We are manufacturer of high pressure equipments from 15Kpsi to 60Kpsi included valves and fittings. We also deal with high pressure tubes from 1/4" to 1" o.d. 316 high strenght material (usually 100.000PSI 700N/mm2 Rp 0.2 minimum)...
  12. themad1

    Flow direction in the needle valves

    Thank you everyone!
  13. themad1

    PTFE / Teflon body seals on ball valves

    Hi What do you mean with PTFE doby seal? Do you mean the gasket between body and closure? No rubber (FKM or NBR ORings) ? Which internal bores are you searching for? Regards Daniel
  14. themad1

    Flow direction in the needle valves

    Hi! Usually the manufacturers indicate on the needle valves the direction of flow which must follow the fluid. Generally, the fluid is conveyed from under the shutter, passes into the chamber of the bonnet and then exit. But can the needle valves be used in the opposite direction? What there...
  15. themad1

    Can ASME Section VIII Div.1 UG27 be used for valves w.t. calculation?

    Hi, My complete question is: can ASME Section VIII Div.1 UG27 be used for ball valves body w.t. calculation instead of ANSI B16.34? Actually I would like to understand the difference between the two calculation formulas and why at the same pressure, temperature and material the two codes give...
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