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Recent content by engr2GW

  1. engr2GW

    3 phase separator, oil bucket front and water weir at the same height

    Hi All, There is a 3 phase separator with oil bucket and water weir "accidentally" set at the same level. The water weir is supposed to be a bit lower to let water enter the water chamber from under the bucket. Have anyone experienced this and how did you solve it...How can one solve this...
  2. engr2GW

    Double block and bleed and bypass

    Tried attachement again, I believe it should work this time. Sorry about that. As much as possible, do it right the first time...https://files.engineering.com/getfile.aspx?folder=a80e8e45-ed5f-4eaf-abce-bd039a1c628c&file=B_block_bleed.pdf
  3. engr2GW

    Double block and bleed and bypass

    Okay, and this is CL 600 service, the bleed is on the process piping, separate from the valve As much as possible, do it right the first time...
  4. engr2GW

    Double block and bleed and bypass

    Thanks, @georgeverghese. This is natural gas, could be sweet or have some H2S. As much as possible, do it right the first time...
  5. engr2GW

    Double block and bleed and bypass

    Additional information: Operating pressure is 1100 psig As much as possible, do it right the first time...
  6. engr2GW

    Double block and bleed and bypass

    Hello all, In the attached drawing, there is a control valve with isolation valves on either side of the control valve. A bybass is used to continue to flow gas if the control valve is to be maintained or worked on. each of the isolation valves have bleeds to bleed off pressure before working on...
  7. engr2GW

    ASME B31.3 PWHT min thickness for Carbon steel

    Thank you for the response and advise. Much appreciated. As much as possible, do it right the first time...
  8. engr2GW

    ASME B31.3 PWHT min thickness for Carbon steel

    Hello, The min thickness for PWHT to be required used to be 3/4 inches. I only have the 2012 version of the document. Has it increased? I saw a document where 0.98 inches was required as minimum, but there was no reference. Has it changed from 0.75 inches? Thank you in advance As much as...
  9. engr2GW

    Heater treater oil b/day equation

    Hello, when you know the oil specific gravity, expected percentage water content (i.e., mostly oil), OD and lenght of the heater treater, expected heated temperature, specific gravity of the water, etc. What is the equation to estimate the barrel per day for a horizontal heater treater (or a...
  10. engr2GW

    PSL1 or PSL2 materials for pipelines (ASME B31.3, B31.4, and B31.8)

    Thanks for the responses As much as possible, do it right the first time...
  11. engr2GW

    PSL1 or PSL2 materials for pipelines (ASME B31.3, B31.4, and B31.8)

    Hello, Is there any requirements for pipe material to be PSL2 in the process, gas, or liquid pipeline codes? if so, any reference will be greatly appreciated.. Thank you As much as possible, do it right the first time...
  12. engr2GW

    Gas pipeline: Velocity vs pressure drop, importance

    Hello, sometimes during gas hydraulic calculations, one may meet the recommended velocity margin, but the pressure drop may be a bit on the high side, other time, one may get the pressure drop per 100feet just right, but the velocity may be lower than typical recommendations. Because the source...
  13. engr2GW

    Temperature/Pressure drop due to wafer check valve

    @1503-44, Yes sir, it was one of those MOCs that was not MOC'ed. installed without consent, lesson learned. and about my last post, I meant to say "...50psig can now be seen upstream of both the new and existing problematic check valve" As much as possible, do it right the first time...
  14. engr2GW

    Temperature/Pressure drop due to wafer check valve

    Thanks for all the post. The suspicion was correct. we put another line of just 4" parallel to the existing one with a regular full check valve and the 50psig can not be seen upstream of both the new and existing problematic check valve. Therefore, the check valve had too small opening and...
  15. engr2GW

    Temperature/Pressure drop due to wafer check valve

    @Danschind. I agree, the 50 psig is the responsibility of the control valve to the compressor. The dilemma is, that 50 psi should be able to keep the line upstream of the check valve relatively low too. Hence the suspicion that the check valve and its small opening and flapper is causing that...
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