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  1. stiffler

    EN ISO 15848

    Hi everyone, I have a question relating to EN ISO 15848. My question is: If I were purchasing valves that meet class B of the above standard, would each individual valve be tested or would the valve design be approved to the standard? Any halp is appreciated. Thanks, stiffler
  2. stiffler

    PTFE / Teflon body seals on ball valves

    Dear all, I am looking for some advice please. What I am wanting to know is...are there any ball valve manufacturers who use PTFE body and stem seals on ANSI 600 and above? Services to include: Glycol, Natural gas, Hydrocarbons, Methanol Ambient -46 to +200C teperature range Thanks for any...
  3. stiffler

    Valve industry classifieds?

    Hi, I contract in the valve service industry and I was wondering if anyone was aware of anywhere used valve industry equipment, machinery, test rigs etc. can be bought and sold. I have a couple of things such as a trevitest unit that are now surplus to my requirements and it seems like a...
  4. stiffler

    What is special about ammonia service Globe valves?

    Guys, I am looking at 25mm (1") manual globe valves for use on ammonia. I have to find 40 or so of these valves for a new build project but I don't know where to start. My client mentioned 2 bolt Ammonia flanges - I have no idea what these are. Temperature will be ambient, pressure will be...
  5. stiffler

    On-line set point Verification on pilot operated?

    Can pilot operated relief valves be tested in-line like conventional spring ones can. I've been looking at methods such as Furmanite's 'Trevitest' for in-line testing but it's un clear to me whether there's a method for testing pilots. Thanks in advance, Matt.
  6. stiffler

    PSVs and SRVs

    Is there any difference between a Pressure Safety Valve and a Safety Relief Valve? or are these just 2 names for the same valve? if there are differences, what are they please? Thanks, Matt.
  7. stiffler

    why does a leaking gas pipe freeze?

    I am completely new to this site, so first of all I'd like to say hi! I am currently putting together some training information for new Engineers who have joined our valve servicing company who have little or no previous petrochemical experience. The idea is to give them some basic information...

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