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  1. nightfire007

    thickness of butress thread

    we have purchased a casing with size of 18 5/8 inches , but the thickness at the end of thread is much lower than the body thickness and exceed the minus 12.5% which has been mentioned in the API 5CT for body. i know due to the taper, certainly the thickness at the end is lower than casing body...
  2. nightfire007

    Mechanical Design of ball valve

    we purchased some ball valves from one of the factories as follows : 1- 18"-Class 600- Flanged, Top entry ball valve, F.B: 2- 18"- Class 600- Flanged, Top entry ball valve, R.B: 3- 20" –Class 600 –Flanged, Top entry ball valve, R.B 4- 24"-Class 600-Flanged, Top entry ball valv, R.B during...
  3. nightfire007

    how to dedicate letters or numbers to Grades of NUTS?

    Dear ALL, I have reviewed reference standard No.: BS 1083:1965 for Screws and Nuts,in this booklet Grades has been mentioned by English letter's such as A,R...and so on,but as i have searched grades for these commodities has been mentioned by numbers such as 4.8,then i want to know how grade...

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