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Recent content by BFZHA

  1. BFZHA

    Gate Valves Trim in API 600 Latest Edition

    Hi, In the latest edition of API 600 (Fifteenth Edition - 2015) in Table 8, the trims No. 1 (13Cr) and No. 2 (SS304) have become obsolete. I would like to know if these trims are removed definitly from the manufacturing process or we can specify them (13Cr for example) for some non Hazardous...
  2. BFZHA

    Does a PSV has a MAWP?

    Since the PSV or PRV are designed and installed to open at set pressure to protect vessels and piping systems against overpressure, I think it make no sens to define a MAWP : PSV will not protect "itself". As stated by B31.3 "The Maximum relieving pressure is the maximum system pressure during a...
  3. BFZHA

    PSV wall thickness calculation.

    DSB123 I totally agree with you, especially since I am reading these days Trevor Kletz's book entitled "learning from accident" and I have learned how a little negligence can lead to human drama. The use of the CS and a corrosion allowance of 6 mm for the body takes precisely into account the...
  4. BFZHA

    PSV wall thickness calculation.

    e43u8, Thank you for your reply. I would like to notice that ASME BPVC is referenced in ASME B31.3 and as stated in API 526 for Flanged Steel Pressure relief Valves in design part (chapter 7) " Pressure-relief valves discussed in this standard shall be designed and manufactured in accordance...
  5. BFZHA

    PSV wall thickness calculation.

    Thanks a lot for your answers, First the corrosion allowance is 6 mm, then the missing 0.5 mm do not constitute a big issue if, as you say, a regular inspection is conducted in order to check the level of corrosion. In summury, the final decision should take into account, both design conditions...
  6. BFZHA

    PSV wall thickness calculation.

    I want to discuss an issue we have faced when dealing with PSV body wall thickness. The PSV is installed on a process line where the corrosion allowance (CA) is required. The need for the PSV was urgent, unfortunately the available PSV’s did not match such requirement i.e WTrequired >=...
  7. BFZHA

    What is it??

    It looks like a steam trap or a "temporary strainer".
  8. BFZHA

    Medium alkyds vs Long alkyds

    Hello, For the coating of our pipes we have specified long alkyds paint as a primer. The paint Vendor suggests the use of medium alkyds because it is better than long alkyds paint. After a little search we found that as the oil length of the resin increases, generally the viscosity decreases...
  9. BFZHA

    Inside WN Diameter tolerances between B16.5 and B16.36

    Hi, Since I started this post, it seems correct to me to present the conclusion I obtained after a brief research, however I liked and like to have the point of view of colleagues to better understanding of this issue. First,I recall for welding neck orifice flange some provisions shall be...
  10. BFZHA

    Inside WN Diameter tolerances between B16.5 and B16.36

    Hi, I want to know why for orifice flanges the tolerances for internal diameter shall as per ASME B16.5 (+/- 1mm) except for welding neck flange except which is specified in ASME B16.36 equal to +/- 0.5% of nominal diameter. Please advise because I didn't see any issue to consider ASME B16.5...
  11. BFZHA

    Which is best for P/L valve - DHV bolted body ball valve verses Cameron T31 welded body ball valve?

    According to my short experience in pipeline projects, there are not only advantages in the use of fully welded valves because in case of problems such as blocking ball due to lack of valve maintenance , or damage of the seats or even of the ball, the repair operation may be heavy and very...
  12. BFZHA

    Confined Gasket for gate valve class 150#

    Hi, I am just asking if there is manufacturers which can provide a gate valve with body bonnet flange with confined gasket. Our customer is requesting confined gasket for all gate valves included those with pressure class 150. while it is not mandatory by API600 : article 5.5.2. Regards.
  13. BFZHA

    LARGE DIAMETER BALL VALVE LEAKAGE

    LittleInch, I agree totaly wih you. However, the choice of type of valves was made by client during FEED studies. Unfortunately, during preliminary studies, it is not necessary that those who are close to field problems who specify equipements. So studies or statistical approache will convince...
  14. BFZHA

    LARGE DIAMETER BALL VALVE LEAKAGE

    Thanks for all of you for your reply. when I mentioned the warranty period, I wanted to mention the financial impact of interventions in order to solve the leakage problem. the client always believes that since the valve was delivered with zero leakage it must retain this characteristic. My...
  15. BFZHA

    LARGE DIAMETER BALL VALVE LEAKAGE

    Thank you for your reply. First some detail information : - The valves are trunnion mounted classe 300# and 600#, - Seat are PTFE made and Single Piston Effect. - The valves are Normaly Closed of course this is why the leakage was "easily" detected. The fluid is a treated gas in the three...
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