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  1. Ahsan96

    BOLT LOAD CALCULATION

    Hi TGS4, Thank you for replying to this, been following your participation in eng-tips for some time now. I did go through this standard, Appendix O, Assembly Bolt Stress Determination. Did try to relate it with typical calculation from ASME SEC VIII, Div 1, Appendix 2 Ag x Sgmin-s is =...
  2. Ahsan96

    BOLT LOAD CALCULATION

    Hi Guys, My question may start as weird and weirder as you go along, but would help get rid of the useless thoughts. I am calculating my bolt load, and minimum pretension based on the worst case of the three cases, 1) minimum seating stress (πbGy)=Wg1 2) working condition (2πbGPw +...
  3. Ahsan96

    Operating a H2 type Choke Valve (API 6A)

    Hi All, For those invested in this, we were able to get a torque value which was around 150 lb. ft (near to what I was able to calculate). Which was not that much, however, we had to update the design to a bigger handwheel after that we were able to operate it somewhat easily. Regards, AAI
  4. Ahsan96

    Operating a H2 type Choke Valve (API 6A)

    Hi Little, True, feels like it, there might be an issue with the design. But the design is pretty straightforward H2-type choke see below for a typical design. Hi jbeck, NOT trying to shut off the valve, just we need to operate the stem using the handwheel, from the open to close position...
  5. Ahsan96

    Operating a H2 type Choke Valve (API 6A)

    Hi Members, I had designed a typical Choke Valve (H2 type), stem, and needle type, but facing a very unusual problem while testing. As per API 6A, we need to do validation testing by checking the valve during the operating cycle. See below process However, when we apply rated working...
  6. Ahsan96

    Flow Coefficient calculation of Choke Valves

    Second, you 3DDave. However, there was some reference I was able to pull out to give me a rough estimate of resistance "K" that would be similar to "needle and seat case" I am working on. Using the K calculated (for a specific Orifice size) from here to give me a Headloss/Pressure loss using...
  7. Ahsan96

    Flow Coefficient calculation of Choke Valves

    Trying this forum for the first time, really appreciate the quick response from you guys. I believe it is my poor choice of words that led to this confusion. This is not something that is being supplied, I am working on product development of "Needle and seat choke", the end-user has the...
  8. Ahsan96

    Flow Coefficient calculation of Choke Valves

    Thanks for the quick response, you are right. But there are ways to calculate friction "K Factor" using equivalent Lengths. Then use the head loss/darcy–Weisbach equation to get the pressure loss.
  9. Ahsan96

    Flow Coefficient calculation of Choke Valves

    Hi Members, I have just started working on control valves such as Choke Valves, the typical needle and stem type. Now I am looking for reading material or general calculations I can use to calculate Pressure loss and Cv Value theoretically for choke valves, which I can later verify through...

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