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  1. ketrab88

    Concentricity on the thread - does it make sense when related to other holes ?

    Hi, Thank you very much for all your answers :)
  2. ketrab88

    Concentricity on the thread - does it make sense when related to other holes ?

    Hi, We do not use one standard internally therefore we have a place for such discussion unfortunately. I just got a feedback that it is totally stupid which i I belive it is not and trying to justify the usage of it. I've seen plenty of drawings with the tolerance like this therefore I...
  3. ketrab88

    Concentricity on the thread - does it make sense when related to other holes ?

    Hi, Can someone help me solve onging discussion wihin Engineering dept. I enclosed the example of Concentricity marked on the thread realted to two smaller diameters located before the thread itself. I've been trying to find a standard which expressly explains if its according to GD&T rules...
  4. ketrab88

    Ball Vallve Calculation Design Handbook/Literatur.

    HI all, I am currently looking for a literature related to the Ball Valve design ( metal to metal & soft seated) ? But I am actually as well interested in Gate, Choke valves I've found so far this link to the calculation sheet, which is actually brilliant -...
  5. ketrab88

    Gas tight surface

    It's my first post so sorry for all missing information. Couldn't find the option to edit my previous post so I will just add some info below. Test temperature is - Room tempreature, around 21C. Test pressure for seats is 1034 barg, but it's start leaking at 100 barg. Valve type: Rotary Gate...
  6. ketrab88

    Gas tight surface

    HI, I've been having a problem with gas tight valve. Two rotary parts. The surface on the cooperating parts Is Ra 0.03 Rz 0.7 - I thinkt hat it's too rough. Everything seems ok with water, but when we start testing it at 1000 bar Nitrogen, starts bubbling. I fiugred out now two solutions: 1)...

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