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  • Users: PVRV
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  1. PVRV

    Material Spec for High Partial Pres. H2S Gas Pipeline

    Sjones, If you are eager to learn more, there is a NACE paper (TR) regarding banning the use of ERW pipelines in sour service.
  2. PVRV

    Material Spec for High Partial Pres. H2S Gas Pipeline

    Your apparent lack of appreciation towards pertinent welding processes involved in ERW fabrication is regrettable. I fail to see why you advocate the utilization of ERW pipelines and yet the Company you work for utilizes seamless pipelines and GRP; in addition to zero offshore operations...
  3. PVRV

    Material Spec for High Partial Pres. H2S Gas Pipeline

    Dear Mr. Jones, Several GCC operators require that only HFIW be utlized moreoever, > 400 Hz is mandated. There is no doubt that ERW is cheaper and still inferior; by virtue of your current operation utlizing seamless pipes for flowlines. As for welding X65; I beg to differ. It is...
  4. PVRV

    Material Spec for High Partial Pres. H2S Gas Pipeline

    mcmidkiff: take a look at NACE-MR0175/ISO 15156; I stand corrected about MR0103 scope. Sjones: I wonder how many manufacturers are able to provide HFI > 400 Hz, the time impact associated with weld DT, flattening & microstructure examination, re-coiling tests,etc and how many manufacturers...
  5. PVRV

    Material Spec for High Partial Pres. H2S Gas Pipeline

    a. Thank you PAN, for the correction. b. An increase in material strenght (yield/tensile) is achieved in carbon steel through an increase in Carbon or Manganese content. Both of which are restricted in sour service. Elements that cause segragation such as Sulphur and...
  6. PVRV

    Material Spec for High Partial Pres. H2S Gas Pipeline

    1. NACE-MR0175 has been superseded by MR130. Refer to this thread: thread338-82286 2. NACE-MR0175 does not address HIC, NACE-TM0284 proposes testing methods for HIC without any guidance on acceptance criterion. 3. Refer to this thread: thread286-83592 for proposed...
  7. PVRV

    Corrosion on Air-Cooler tube plugs

    How many tubes were plugged? What is the service tube and shell side? What is the service stream of the tube?
  8. PVRV

    Relief Valve Calculation on Vessel Jacket

    I dont understand your acertions hope the following helps :) 1. Heat Absorbed From The fire qin = 34,500 F(A^0.82) <------NFPA 58 2. Vapor Flow Rate Qrv = qin / hfg where; qin = is the total heat absorbed (Btu/hr.), F= (insulation factor) A is the total surface area (ft^2)...
  9. PVRV

    NDE Methods for Insulated Plant Piping

    Guided Wave
  10. PVRV

    Flare tip material selection

    Good Man :) and solid Engr.
  11. PVRV

    Flare tip material selection

    SJ, Sulphidation & Polythionic acid SCC if the material is sensitised :) At what conditions?
  12. PVRV

    Flare tip material selection

    SJ, The flares are open to atmopshere. How is a thermal barrier coating related to H2S. Cheers
  13. PVRV

    Flare tip material selection

    a. H2S is not a concern for the selection of flare tip material. b. SS310 is superior to 800H. c. SS316 is inferior to both SS310 and 800H. d. 600 is superior to SS310, check the Cr content. Cheers
  14. PVRV

    Multiple service piping problems

    Please provide more details' specifically: 1. Corrosion features; you mentioned rust any other specifics?? 2. Batch reactors; how often is the stream online. 3. Any sampling in progress by Nalco ? what is checked if any? 4. Why is refrigerated methanol being used? At any rate...
  15. PVRV

    Quality Control!!/Inspection!!!

    Hope the following helps, I liked polleke reply ? Quality Control is a hierarchical plan that demonstrates how conformance is managed during various tasks and subtasks to achieve a desired goal. (Refer to ISO-9001) The conformance is assessed against international standards, regulations...
  16. PVRV

    Cost of Quality

    Please be specific: At any rate; This should provide a broad view of the cost of not having quality. 1. http://www.ogp.org.uk/ 2. http://www.hse.gov.uk/statistics/index.htm 3. Past Incidents (Search for) 3.1 Bhopal 3.2 Flixborough 3.3 Mexico City (LPG Plant) 3.4...
  17. PVRV

    pipeline NDT inspection methods others than intrusive pig inspection

    Take a look at GWUT. However, I would suggest reconsidering Intelligent Pigging (MFL)
  18. PVRV

    Long Range UT v Intelligent Pigging

    GWUT http://www.techcorr.com/testing/ultrasonics.htm
  19. PVRV

    Galvanic Corrosion

    Sorry,, why was SS welding consumables used for a CS - CS joint. Under what premise was the WPS and PQR qualified.
  20. PVRV

    SS Clad Vessel in Hydrogen Service and H2S Service.

    :) I hope grampi1 responce, shed's some light on your previous post.

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