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Recent content by pdp123

  1. pdp123

    How can I calculate pipe wall thickness under external pressure?

    Hello Moong.... Could you give more specific details so that other members can provide help. Regards PME Hard Work with Smartness is the key to success
  2. pdp123

    High Alloy Steel grade

    Greetings to Respected and Experienced Members... Please let me know this. 410 has less desirable properties than 316 but it is placed in High Alloy Grade category. What is the reason for this and what extra benefit they have because of this category. Thanks in advance Regards...... Hard Work...
  3. pdp123

    pressure seal valve

    Hello to All Experienced and Respected Members, Pressure seal bonnet valves are used in case of Clean , Steam and Non corrosive services. Please justify the feasibility of this statement with a Logic behind. Thanks PME Hard Work with Smartness is the key to success
  4. pdp123

    Valve trim

    Everybody knows that Clean services require Soft Trim and Dirty services require Hardened trim. What are the cases where clean services require Hardened trim and dirty services soft? Please give examples. Thanks PME Hard Work with Smartness is the key to success
  5. pdp123

    Piping Specification

    I would like to say Thanks to everybody regarding the Maximum and minimum size of Pipe but not clear about the material selection or grouping in B16.5 given the base material family (CS/SS/LTCS/DSS.....)and not respective ASTM material. Regards Hard Work with Smartness is the key to success
  6. pdp123

    Piping Specification

    Hello everybody! Appreciate your help as I have few questions in my mind regarding Piping Specification... 1. How one can decide the maximum and minimum size for a specific fluid/medium. May be based on Client requirements but not exactly. 2. How to find the relevant material group in ASME...
  7. pdp123

    Hardness difference

    Hi to All respected and Experienced members... -There is a Hardness difference in Seat and Disc of valves and the value is restricted to 150BHN. Please explain the purpose of Hardness difference. Per my understanding there is an impact on Trim material selection and the more the Hardness...
  8. pdp123

    internal/external corrosion

    I also do not think but as a general statement which type of corrosion is more governing. Internal or External one and Why? Appreciate your quick response. Hard Work with Smartness is the key to success
  9. pdp123

    internal/external corrosion

    Hi All respected members, Please let me know in general whether internal corrosion is more dangerous or the external one. Regarding the piping industry internal one has more severe effect as the thickness calculations are based on Internal corrosion and regarding the Pipeline industry the...
  10. pdp123

    valve trim metallurgy

    Hello Everybody, Generally the Trim material has Higher corrosion or Erosion resistance than body material but in some cases it has similar metallurgy to valve body. Pl. explain these exceptional cases regarding size, service, design and operating conditions, Pipe material, etc. as there are...
  11. pdp123

    Pipeline material selection

    Hi... Code does not suggest Material selection. It provides the restrictions for a specific material. You have to use your own judgement according to the location, design and operating conditions, vendor experiences, client experiences and specifications, fluid list and the list goes on and on...
  12. pdp123

    Dear all engineers, I have a pro

    Generally the minimum Corrosion Allowance depends on the Project Specification. For CS Piping even the Fluid is water one has to take a certain minimum value. PME Hard Work with Smartness is the key to success
  13. pdp123

    Valves with CS body and CRA (other than SS316) trim

    Just take this with simple Logic. Valve trim material should be of concern as Corrosion is mainly due to the fluid/wetted parts. PME Hard Work with Smartness is the key to success
  14. pdp123

    Selection of seat material based on Operating or design temperature.

    Agreed with TD2K Also look for Upset conditions..... Regards PDP123 Hard Work with Smartness is the key to success
  15. pdp123

    Needle valve, globe valve

    Hi.. Do Google for the info required. Pl. note that Needle is used in small size and reverse for the Globe valves. Thanks... Hard Work with Smartness is the key to success
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