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Recent content by PeterIgg

  1. PeterIgg

    12" Ball Valve Repair

    Sounds like a world of pain you are making for yourself. If 316 is the answer cannot the OEM provide a full 316 ball? It is going to be far cheaper than the route you are outlining. How are you going to get the ball spherical after welding? Ball grinding is a specialized operation that you will...
  2. PeterIgg

    Valve Seat/Stem Material for Monomer Service

    If the cavity is the problem and you only need a unidirectional valve, look at a segment type valve, AKA C-Ball. Just a thought.
  3. PeterIgg

    ON/OFF Valve for Refinery FCC Column Bottom Slurry Service

    Good luck on this one! I cannot provide you with any experience but I would comment that slurry service and valves with a cavity are not a good mix. The cavity will fill with the slurry particles and, in the case of ball valves, the torque will just climb as the particles compact. You COULD have...
  4. PeterIgg

    Lip-seal for body seal (Trunnion 3 piecies ball valve)

    Lip seals are very finicky and have all sorts of issues, often associated with the assembly process and good design (or rather lack of). A bit more information would assist: lip seal material; drawing of arrangement; photo of the failure. The first thing I would look at is the surface finish on...
  5. PeterIgg

    Difference between working pressure and ceiling pressure in asme b16.34

    Have you looked at thread 292-471432?
  6. PeterIgg

    API 6D vs ASME B16.10 face to face dimension

    IMO an API 6D compliant valve will have a face to face per API 6D. The exception would be where there is no prescribed face to face dimension for that size/class. In that instance it is up to negotiation between manufacturer and end user. It does occasionally occur that a valve was made when...
  7. PeterIgg

    Wedge Gate valve drift internal diameter

    Would Table 1 in API 6D not be relevant? 4.4.2 Full-opening valves shall be unobstructed in the fully open position and have an internal minimum circular opening etc etc. I do not believe that B16.34 goes into that area itself.
  8. PeterIgg

    Gland tightening torque

    My stock reply to: How much torque to apply to gland packing?" is: "Until it stops leaking!" Not a particularly useful response, I'll grant, but the best one I can come up with. There are SOOOOO many variables with gland packing, not least: the size and number of the gland bolts, the type of...
  9. PeterIgg

    Double Dump Valves

    Good luck on that one! A dry, abrasive powder would have to be one of the most difficult services for a valve of any description. Certainly avoid any with a cavity where product can become trapped and compacted. My initial thoughts were for a pinch valve, but with the frequency of operation I...
  10. PeterIgg

    Expired Fire test certificate

    I do not understand the comment "expiry of a Fire Test cert". Assuming we are talking API 607, the test is a type test and is current for the design whilst the date of manufacture was when that standard was current, and, of course, there is a period of grace between the new standard coming into...
  11. PeterIgg

    Testing (Hydro) of a spare valve

    I suggest that the reason I would recommend testing a valve that has been in store for a period of time is that (often) valves are not stored particularly well and it is much better to find out that the valve is not working as it should BEFORE it is installed into line and NOT afterwards! The...
  12. PeterIgg

    FCI 70-2 Class-IV Seat Leakage Rate Calculation(what is the meaning Valve Rate Capacity???)

    For flow capacity, read Cv of the valve.
  13. PeterIgg

    Aviation Gas

    I would tend to agree with BCD, the material selection should be suitable for the application unless there is some peculiar additive in the fuel. One of the causes for increasing operational torque in trunnion mounted ball valves is the acculuation of foreign matter betweent the back of the seat...
  14. PeterIgg

    Aviation Gas

    If you can give some more details it would assist: Size? Class? Floating/trunnion? I assume it is just under natural head pressure from your description. How much head? Did you do any examination of the previous valves removed from service? Did you notice swollen eastomers/seals that lead you to...
  15. PeterIgg

    Help Me Diagnose Steam Ball Valve Seat Failure

    I would concur with bcd, this is an upstream seat. As the ball moves from the closed to open position, this part of the seat beconmes unsupported by the ball and if pressure gets behind the seat it can push this part of the seat out. The small grooves (notches) that you can see in the...
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