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Pipeline transporting Naphta and jet fuel 1

MMED

MMED

Chemical
Feb 8, 2024
15
Hi

We have tow pipelines of 500 meter transporting NAPHTA and Jet Fuel were initially underground and after several years of operations we are planning to replace them due to corrosion. My question is if we change them to above ground , is there any risk or restriction that may affect its operation? Please advise if there's any referneces or standard that clarify this?

Best Regards
 
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In general, above ground lines would fall under piping or B31.3 as the pipeline codes don't really like above ground lines.

Risk levels are usually higher due to the issue of damage, corrosion (can't use CP), thermal movement requiring expansion loops for a 500m run, increase in operating temperature due to solar gain and hence higher static pressures / decrease in operating temperature in winter / very cold leading to increased viscosity, possible vacuum conditions etc.

But each to their own. There are many standards to tell you how to do, but they will not tell you what to do - that's your choice when considering all the issues.

Your risk contours will be higher as there is a higher chance of impact damage and corrosion for above ground lines. Also jet fire radius will be bigger as a sideways jet will go further than if it is in a hole in the ground.
 
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LittleInch said:
In general, above ground lines would fall under piping or B31.3 as the pipeline codes don't really like above ground lines.

Risk levels are usually higher due to the issue of damage, corrosion (can't use CP), thermal movement requiring expansion loops for a 500m run, increase in operating temperature due to solar gain and hence higher static pressures / decrease in operating temperature in winter / very cold leading to increased viscosity, possible vacuum conditions etc.

But each to their own. There are many standards to tell you what to do, but they will not tell you what to do - that's your choice when considering all the issues.

Your risk contours will be higher as there is a higher chance of impact damage and corrosion for above ground lines. Also jet fire radius will be bigger as a sideways jet will go further than if it is in a hole in the ground.
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Hi

Thank you very much for your feedback on this. Much appreciated.
 
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There are hundreds., if not thousands of miles of B31. 4 &. 8 above ground pipelines in the world. What matters is if it is a pipeline, or a process line. Look in the Scope 1.0 of each code for their definitions and select the code that applies.
 
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1503-44 said:
There are hundreds., if not thousands of miles of B31. 4 &. 8 above ground pipelines in the world. What matters is if it is a pipeline, or a process line. Look in the Scope 1.0 of each code for their definitions and select the code that applies.
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True, but there are millions of of miles of buried B31.4 and B31.8 below ground / buried pipelines.

You know as well as me that above ground lines to pipeline codes are not the best suited. Yes i can be done, but B31.3 is a much better design code for 500m of above ground pipe. In reverse, B 31.4 or .8 is a much better code for 500m of BURIED pipe. Each to their own....

Welcome back.
 
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LittleInch said:
True, but there are millions of of miles of buried B31.4 and B31.8 below ground / buried pipelines.

You know as well as me that above ground lines to pipeline codes are not the best suited. Yes i can be done, but B31.3 is a much better design code for 500m of above ground pipe. In reverse, B 31.4 or .8 is a much better code for 500m of BURIED pipe. Each to their own....

Welcome back.
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Thank you for your advice.
 
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No argument there.

Outside the US, there may not be any meaningful distinction between pipelines and process lines. And, if it were a short bit of above ground pipe in what was a long buried pipeline, I would definitely not change the code. Inside the US, there is a clear difference that you wouldn't want to confuse. .
 
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If this corrosion is internal, then you will have the same problems with above ground lines as with the old underground lines. Got salty water in these fuel grades at the source tanks ?
 
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Hi,
Have you ever considered to wrap your underground pipe?
www.densona.com

Buried Pipe Anti-Corrosion Solutions - Buried Steel Corrosion Prevention

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My 2 cents
Pierre
 
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georgeverghese said:
If this corrosion is internal, then you will have the same problems with above ground lines as with the old underground lines. Got salty water in these fuel grades at the source tanks ?
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Get any water in jet fuel and you've got serious trouble....

My guess is that for 500m length these lines were poorly coated and had no CP. Might also be coastal and with high salt content in the ground.
 
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