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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

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...

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

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

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...

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

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...

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...

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

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...

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...

@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...

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...

@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...

Thanks for all the response: @danschwind: yes, upstream and downstream of the check valve, we just happen to have gauges at those points. the gauge downstream of the check valve (which is upstream of the control valve) is the same as the one downstream of the control valve, i.e., 50 psig. But...

SORRY, HERE As much as possible, do it right the first time...https://files.engineering.com/getfile.aspx?folder=347c3ef6-542c-4833-a78d-e82cea6c3d05&file=WAFER_CHECK.pdf

THANKS, HERE'S A DIAGRAM As much as possible, do it right the first time...

Hello, I have never used a wafer check valve before. My Operators used it for the first time on a line feeding the suction of a compressor for natural gas (not dehydrated yet). The suction control valve is set at 50 psig (or the suction pressure is 50 psig), this keeps the suction header at 50...

Hello, For liquid: Most of the equipment that I have seen operate in pressures where the DP will almost always yield critical flow. My question is, if the P1 and P2 across a liquid control or dump valve create critical flow and the downstream vessel can not be operated at a higher pressure to...

Hello all, 1. Is their a minimum MAWP or design pressure that classified a vessel as pressure vessel? 2. I have worked with a lot of suppliers that IN THE PAST have built vessel "in accordance with ASME", as opposed to ASME stamped, is the stamp a code requirement or is it an operations...