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  1. ivarfar

    Control valve straight run requirement

    I'm currently working in a gas compressor module project. As always there is an anti-surge loop with an anti-surge control valve in our module. Some collegues of mine insist that there should be straight pipe runs (e.g. 6D/4D) on either side of the control valve. It is referred to as good...
  2. ivarfar

    Class 900 PSV in a class 600 system?

    We have a case where the system piping was determined to be class 600 and later the PSVs were found to be class 900. The stainless steel PSVs have been dimensioned to size "L". Set pressure is 7100 kPa abs and relief temp. is 38°C. This results in a class 900 (inlet) PSV according to API 526...
  3. ivarfar

    Rising stem ball valve substitute

    The rising stem ball valve is an adaption of the quarter turn ball valve. The ball is turned by means of a sliding helical guide. Example: Grove Omega Rising Stem Ball Valve. As I understand the ball rotates away from the seals until the final closing movement. Problem: CCV has bought up all...
  4. ivarfar

    Rising stem ball valve substitute

    Thanks for alternative valve source tips. Cooper Cameron owns the lot. Only one source.
  5. ivarfar

    Rising stem ball valve substitute

    Our customer has specified rising stem ball valves for some applications. These are hard to come by and only manufactured by a very, very limited number of companies. Does anybody know of ball valves that have similar properties, i.e. very good tightness and wear properties?(...at least as...
  6. ivarfar

    Do blowdown valves need double piston effect seals?

    I have a HC gas compression application with a number of BDVs of ball type. Pressure classes range from #150 to #1500. I cannot see that double piston effect seat rings are specified anywere explicitly. Question: Is there any advantage, or even a necessity, to use double piston effect, as...

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