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  1. johnthebest

    Testing Davits for pressure vessels

    @SnTMan I just wanna know what is the common practice and if the Man way davit has to be tested or it just follow the design standards.
  2. johnthebest

    Testing Davits for pressure vessels

    Hello everyone As per our project specification: "Davits shall be tested to a safe working load 25% greater than the weight to be lifted. The safe working load shall be stamped on the davit following the test." The contractor claims that this clause is only applicable to the top davit that is...
  3. johnthebest

    Manual Valve API 623 VS ASME B16.34

    We are on the go of a central processing facility project. our contractor claims that in order to match the CV of the conrol valves (as per ASME B16.34) and the manual globe valves (as per API 623) (which serves as a by-pass of the control valves and will be operated only in case of maintenance...
  4. johnthebest

    ASTM D1785 and ASTM D 4396 PVC pipes

    Hello everyone, I got a tehcnical query from the contractor stating the following: "At present, in Piping Material Specification, Pipes & Fittings are specified as ASTM D1785 & ASTM F491 respectively. However, being non-pressurized underground piping, contractor understands that PVC pipes as...
  5. johnthebest

    A106-B vs A333-6 piping material

    and the reason for deviating from the spec is to save time and avoid procuring and then send it for impact testing
  6. johnthebest

    A106-B vs A333-6 piping material

    @ david339933 exactly. the contractor stated that this material is already impact tested.
  7. johnthebest

    A106-B vs A333-6 piping material

    Design Temperature range for offered Pipe material A333-6 SMLS is -21 to 215 Deg. C and the process design temperature requirement is -5 to 90 Deg C.
  8. johnthebest

    A106-B vs A333-6 piping material

    the normal operating temperature is 60 C°
  9. johnthebest

    A106-B vs A333-6 piping material

    Hello everyone in our piping material specification we required the material A106-B SMLS (Impact tested) for a specified class (10 Inch and above) our contractor proposes the use of the material A333-6 SMLS without impact testing justefying that this is a higher material and doesn't need...
  10. johnthebest

    Plenums of Air coolers heat exchanger: Box-type vs Transition

    Hello everyone Based on the API 661 standard, there are 4 Plenums types. I want to know the difference between the first two types: a) Forced draught- Box plenum b) Forced draught- Transition plenum Advantages, disadvantes. thx in advance
  11. johnthebest

    Hardness test requirement

    I just got a reply from the contractor that the partial pressure of H2S is too low that leads to NACE is not applicable. Plus his understanding is that when required means if it is required by the process or the code. so this clause limitation is not a must to do.
  12. johnthebest

    Hardness test requirement

    @SJones From what I understood, there is a deviation made by the contractor regarding the spec clause.
  13. johnthebest

    Hardness test requirement

    Actually the spec was made by a third party. what I want is to an interpretation from a contractual point of view.
  14. johnthebest

    Hardness test requirement

    Hello everyone I would like to have your help about this technical query In our project specification, we said the following: when required, hardness test shall be performed on.... "see page 3 of 3 in the attached file" The contractor is proposing the following: For P1 material weld and HAZ...
  15. johnthebest

    Valve materials specifications

    Hello everyone I wanna your opinion about deviations made by the vendors regarding our project specification: --------------------------------------------------------- 1. SPECIFIED REQUIREMENT Seat Material -RPTFE 1*. COMMENTS / DEVIATIONS OFFERED BY SUPPLIER "vendor valves has offered Devlon...
  16. johnthebest

    Performance Testing of Gaskets Nitrogen vs Methane

    Thx for ur reply. is there any major differences between using methane and nitrogen gas?
  17. johnthebest

    Performance Testing of Gaskets Nitrogen vs Methane

    Hello everyone, I received a technical clarification from the contractor about Performance Testing of Gaskets and I want your opinions: "Dear Sir This is regarding procurement of Spiral Wound Gaskets.( as per ASME B 16.20 2017 Edn ) We are in the process of placing Orders(Manufacturer of Spiral...
  18. johnthebest

    Positioner material of construction - Die Cast Aluminium

    Hello everyone In our project specification we have set the MOC for the control valve to be Die Cast Aluminium. However the vendor is suggesting "Anodized Aluminium - Low copper content (< 0.4 %)"" in-place of ""Die Cast Aluminium" what are your thoughts
  19. johnthebest

    metal seated ball valve VS soft seated valves

    Hello everyone Today I have received a technical query and I want your opinion about it. Requirement of metal seated ball valve: 1) As per Clause No ..... of Piping material specification, metal seated ball valve shall be considered for operating temperature ≥ 121 Deg C. 2) As per Clause No...
  20. johnthebest

    NDT requirements for Valves

    Thx for your response

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