Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by johnull

  1. johnull

    WELLHEAD CHOKE VALVE

    Powerchoke or T3 Choke is used a lot on drilling manifolds. 2-way gates mean double lifetime as you can just take it out, rotate it 180 degrees, and back in. Easy to maintain and a lot of spares. I assume they have expensive parts but can't say for sure.
  2. johnull

    Balon floating ball valve leaking

    I don't think I mentioned they being on a wellhead, nevertheless I have no issues with them leaking as that can happen to any valve. But not being able to understand how to repair it really annoys me. I consider myself above average skilled when it comes to repairing. But when it comes to these...
  3. johnull

    Cage-moving control valve

    Cage should not move. It could possibly rotate but not likely. If it moves there might be a bonnet gasket missing, or wrong installation. but then you should see leaks to surface very easily. There could also be installed an insert cage with incorrect parts. That means you have in example a 3"...
  4. johnull

    Balon floating ball valve leaking

    quote: Hello johnull, When you have pittings common on a multiple of valves, something is clarely wrong. A good constructed floating ball-valve, with narrow tolerances in production (minimumvarity in how parts fit together), correct material selection, and all suited for the flow/fluid should...
  5. johnull

    Balon floating ball valve leaking

    I'd say this is as close as it gets. http://www.wermac.org/images_large/valve_ball.html The seat has its own area were it seats/sits, however I would not call it a groove, but rather a hole or area where it sits. The seats as you might see is flush with the bore wall so I'd say it sits pretty...
  6. johnull

    How to correctly grease a gate valve in line/manifold

    I have grease a lot of valves in a manifold, but I have continuously asked myself if it is necessary or not. Depending on the grease and media flowing through I would say so that it is necessary to fill up with grease with intervals. The easy part is to grease it when it is sent in and repaired...
  7. johnull

    Balon floating ball valve leaking

    The reason I say some to no pitting is because there is a lot of the valves with pittings that holds, and a lot of valves without pittings at all that leaks. The primary and secondary sealing area are both on the seat to ball interface. Not the seat to body. However, that is where we find most...
  8. johnull

    How to correctly grease a gate valve in line/manifold

    There is usually a couple of kg with grease in the gate valves cavity. The reason I know about is to prevent well fluids from entering the cavity, causing lots of different problems. I.e corrosion, erosion, differential pressure (making it hard/impossible to operate) Also aids in keeping the...
  9. johnull

    Balon floating ball valve leaking

    Hello. Is anyone familiar with the Balon floating ball valve? These valves are very easy to maintain/redress, however, I feel no matter how good of a job you do when performing maintenance, you never know if it is going to leak. The only thing I can say 100% sure works is a flange sealant...
  10. johnull

    How to correctly grease a gate valve in line/manifold

    Simple question, tricky to answer I guess. How do you correctly grease a valve that is mounted on a manifold or in a process line without getting grease in the bore? The bleeder plug is obviously a good thing, but a lot of valves do not have this, and I believe it is hard/impossible to grease it...
  11. johnull

    Which API 6A Gate valves should I choose?

    Hello, I am trying to figure out the different pros and cons when it comes to the normal API 6A gate valves used in kill & choke, standpipe and well test system. There are many different suppliers (WOM, T3, Anson, Cameron etc) and some seem to use the same principle. However, I have come across...
  12. johnull

    API 6A recertification

    That is my thoughts exactly! And yes it can be confusing, and then you start talking to others that think they know it and the confusion ball just keeps getting bigger. Everything you have told me makes perfect sense, and I consider myself above average when it comes to understanding these...
  13. johnull

    API 6A recertification

    You understood the questions as far as I can tell. I also understand your answer better know. (read it a couple of times at first) Most of the valves I am working on are 5 years old, or less. According to national standards, it is a requirement to do a recertification of them every 5 year, so...
  14. johnull

    API 6A recertification

    So, lets say you repair it for the first time to RSL1. due to no indications visually on the valve. Next time you need to weld repair it, and if it is RSL1 then there are still no changes? Assuming it would require heat treatment and NDE before and after weld? Or is this maybe another chapter...
  15. johnull

    API 6A recertification

    Thanks a lot for your answer. I'll buy myself a copy of the API 6AR 2nd edition. (I currently have the first) So if I understand correctly. I have a valve that is according to API 6A, PSL 3. That does not necessarily mean it has to be RSL 3? Unless manufacturer specify so? Or does it actually...
See more

Part and Inventory Search

Back
Top