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  1. Anarchy

    IEC 60529 IP ratings

    I am getting mixed responses regarding whether higher IP ratings automatically qualify for the lower ratings, for example is a IP68 rated device always suitable for an IP56 application? The first figure relating to ingress of foreign objects logically seems higher is better but what about...
  2. Anarchy

    Intrinsically safe equipment in non-incendive application.

    Can equipment certified EEx ia suitable for zones 0, 1, 2 be safely installed and used in an installation requireing Ex n zone 2 certification?
  3. Anarchy

    Filter regulator - Relieving type

    I am just looking for confirmation of the difference between self relieving and non-relieving filter regulators. I need to convince our client there is no risk to a diaphragm actuator downstream of a regulator which accidently gets over pressured. Pressumably in a fail situation one type vents...
  4. Anarchy

    Actuator instrumentation

    Consider a pneumatic actuator with a positioner, air lock and volume booster on. I can understand the reasoning for putting the air lock last (ie next to the actuator) so when air is locked in there is less potential leakage path. The problem we are having is the airlock is restricting the...
  5. Anarchy

    NORSOK and valves

    Following on from a previous topic (thread330-184673) It was suggested NORSOK applies to higher grade(is this the correct term?)metals for example Duplex but not ASTM A352 LCC but the thread was ended. Our metal man at work is looking in to it but I thought an alternative opinion would be useful.
  6. Anarchy

    Butt weld ends

    Is it normal to have Butt weld end connections on lower class valves. Specifically an ANSI class 150 300mm valve. I was lead to believe the point of welding them in was for higher pressure thicker pipelines.

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