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Recent content by Burdy

  1. Burdy

    Ball valve

    I agree with the 'Wetted' explanation as being the same as 'Exposed'
  2. Burdy

    will grounding prevent aluminum corrosion?

    Isolate the Aluminium from the Galv structure with PTFE pads to eliminate any electrical difference at the joints (where the material will corrode) then connect your earthing strap (because you could end up with static) through a sacrificial anode i,e, lead.
  3. Burdy

    Isolation Valve for Manifold (offshore)

    A lot of valves being installed in this position are trunnion ball valves. Debris which may get trapped at the bottom of the gate can hold the gate off and stop full closure, this is not a problem with a ball valve. The other thing is you can readily fit a Partial Stroke Device - PSD, to a ball...
  4. Burdy

    Fire safe test

    In addition to gerhrdl's 'Firesafe by construction' its also called 'Firesafe Design'
  5. Burdy

    2-1/16'' Subsea Gate Valve

    Subsea Actuator to Match - perhaps Ledeen
  6. Burdy

    Testing a valve with RTJ

    If its hydraulic testing your risk is low, if gas then just don't do it the Risk is too high.
  7. Burdy

    DUX DCV-C600 Choke Valves

    Ask Dux about the Apache - North Sea application where they solved a major errosion problem.
  8. Burdy

    About selection of valves and process and not a constructive

    I agree with terje61, if you go and specify a valve and its wrong it comes down to you, is the application your reading about 'EXACTLY' the same! Both the manufacturers and people on the plant know what works and what doesn't. Manufacturers have a wealth of experience built up over decades of...
  9. Burdy

    Fire testing of EPDM/Rubber lined Butterfly valve

    What did the 'Certificate of Fire Approval' say about the standard it was performed too?
  10. Burdy

    high temperature o'rings

    We changed our o rings out to graphite rings as the seal was static. Metal orings were just far too expensive to incorporate into the product. B
  11. Burdy

    fire safe "design" verse "tested"

    I can see why you are confused, valve manufacturers may have a design of valve which has been Fire Tested and is therefore 'Certified' Fire safe, whether by design or not, it holds a unique certificate for its BOM. A simple change in build i.e seat material, may then not have been tested(and...
  12. Burdy

    Cryogenic Materials (Non-Metallic)

    Glass filled Torlon will abraid the o ring. B
  13. Burdy

    Cryogenic Processing ???

    What grade of 17.4ph are you using? I've used HH1150 for a number of years for shafts with high torque requirements within a cryogenic environment. We soaked every one of our components prior to installation. There always appeared to be less failure issues and better performance when doing...
  14. Burdy

    Can PVC be NACE approved for Sour Service?

    Whilst I've made no reference to the melting point of PVC, I know it is low. My experience from firetesting Polymer seated valves as against lined would say that (size dependant, because a large body would not get to temperature in 1/2 hour) a 6 inch valve would last less than a rubber one, say...
  15. Burdy

    Cryogenic Test Bench for Valves

    NGL, I totally agree with what your saying. I always get the question when showing people aroung the cryo test facility - Why are you testing with the cold media on the outside when surely it is the inside which is being used.Plus the fact that ALL tests are done with Helium gas, where the valve...
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