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pennpiper, You wrote, Now let's consider the different Standard ways that an "Open or Closed" Valve is indicated on a P&ID (NO=Normally Open, NC=Normally Closed, CSO= Car Seal Open, CSC= Car Seal Closed). only if indicated on the P&ID then include the Simple Open or Closed indication (as shown...

pennpiper, I completely agree. If a P&ID specifically shows a valve open or closed, the valve has to be shown in the isometric accordingly. I also agree that not all valves in a P&ID have the open/close position indicated. Also, yes, an isometric is not normally used as the primary tool for...

I think, If P&ID shows a valve closed, that valve has to be shown closed in isometric. Valves have to be shown open/closed in isometrics as shown in P&IDs because they will be erected as shown in isometrics. Valves that have to be normally closed/open during operation will be represented in...

@LittleInch, Yes sir exactly. I will try DNV OS-F-101. Though the pipeline thickness is 9.5mm, it's inclusive of 3mm corrosion allowance and a negative mill tolerance of 12.5%. So, I think the check has to be done for 5.3mm Never forget what you are. The rest of the world won't. Wear it like...

Yes I tried with L = 6000m. It's failing. But should I really follow Section VIII here? Thanks. Never forget what you are. The rest of the world won't. Wear it like an armor and it can never hurt you.

Thank you LittleInch. XL83NL and KevinNZ, Design code is ASME B31.4. It does not lead me to ASME BPV VIII Div1 UG 28. Only ASME B31.3 does. But my pipeline is not as per ASME B31.3. Even if I follow ASME VIII Div1 UG 28, what will be the value of L in L/D? Thanks for your responses. Never...

Hello, There is a 36" 6km long crude oil pipeline. Thickness is 9.5mm with 3mm corrosion allowance. How do I verify if this thickness is sufficient for full vacuum condition? Thanks, Never forget what you are. The rest of the world won't. Wear it like an armor and it can never hurt you.

@maxdistortion I am thinking the same. Never forget what you are. The rest of the world won't. Wear it like an armor and it can never hurt you.

Hello Markovnikov45, You have a spool piece in between the two valves. 1. This spool is of SS or LTCS? 2. Can I assume that the line size is at least 4" or more? Because, the required dimensions to bolt a 3" or smaller 300# flange to a 600# flange match as per B16.5 in which case you...

Hello, I am working on a delayed coker unit. There are 4 coke drums and 2 heaters. Each heater has six 6" passes (total twelve 6" passes). Two 6" passes combine to form one 10" cell (total six 10" cells). Three 10" cells combine to form one 16" line to the coke drum switch valve. I have...

Hello, It feels good to open eng-tips after a long time. Hope you all are doing good. Now, regarding this post, I think MickMc has explained very clearly. Generally, process engineer specifies the material to be used. There is usually a document called "fluid list" that mentions the material...

thread330-206212 Can I use P91 or P5 trunnion instead of P9 trunnion? Please justify. Thank you.

Thanks for the promot response. And apologies if I had sounded confronting or rude. I obviously didn't mean to. I just asked the doubt I had in mind. Maybe I could have used polite words but I really don't see what made you presume I was confronting. I wasn't confronting. I was asking. Thanks...

Dear zdas04 In reference to your statement " I've checked hundreds that said "no problem here" and dozens of those lines had failures within 6 months" The material of the corrosion coupon is the very same as that of the pipe right. And, the fluid is going to be the same with same process...

Thanks Gator. I was looking for something like this. But what if the suction line comes from bottom? Any way the water is going to be collected in the bottom side of the pipe as water is heavier than air right..

Why is the reducer in a blower inlet line eccentric with bottom side flat?

If I say the rating of a Ball valve is PN 25 (DIN standard), what is the equivalent rating in American standard (150#, 300#, etc..)?

Can anyone please highlight what PSV (pressure safety valve) and a PRV (Pressure relief valve) are? How are they different from each other? Where are they used?

FYI, you can re-post and "red flag" your old one for deletion. Or, if it is a small edit/typo you can red flag it and a change will be made.

Dear Pennpiper, I knew the expansion. I wanted to know what it is and why it is used. Dear Littleinch, our process engineering team says they want these LFE valves in the sour water stripper acid gas lines. Then I am thinking LFE valves are used here just to avoid H2S leakage? Because we have...