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TOPIC: Pipe Rack vs sleepers

11 years 3 months ago #7335

  • alexsel
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Hello, I am new to this forum.

Can anyone please explain to me:

A) What is the purpose of pipe rack? So many engineering hours are spent on designing and detailing the pipe rack, so much steel material is used, so much fabrication of steel is being done at both the workshop and at site, so many erection time is being consumed: why can't we have a simple system of pipes on sleepers everywhere in the plant?

And if human access and escape routes are the only reason for pipe rack, we can always have a cheaper mechanism of circular roads and walkway platforms on the sleepers at regular intervals. With this method, we can save on plenty of material cost ,manpower cost and schedule cost.


Awaiting your replies

Regards,

Alexsel

Yes safety and accessibility are 11 years 3 months ago #4656

  • Jop
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Yes safety and accessibility are two of the main reasons.
You also will increase the cost of the plant because you lose the space under the sleepers for other important needs.
These needs include:
-Space for pumps
-Space for underground main electrical duct banks
-Space for mains for the underground drain systems

For more insight into Pipe Rack and Pipetrack (Sleepers) go to the following web site.
http://www.red-bag.com
On the left side of the screen go to "Library", then "Design Guides", then "Bn-dg-C1b"[/list][/list]
Do it once and Do it Right

In addition you will find 11 years 3 months ago #4657

  • Jop
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In addition you will find that many if not most Refinery, Petrochemical and Chemical plants have multi-level pipe racks. Sometimes Fin-Fan Coolers are mounted on top of the pipe racks.

If you went with multi-level sleepers you would need stairs (going up to the level of a typical third floor) to a stile to cross to the other side of the rack.

When there are Fin-Fans they are set on an elevation based on critical process conditions that would not change. So you would still have that high structure down the middle of the unit. You might as well go ahead and raise the pipe way decks up so you can walk and drive under them.

There is also the problem of all the branch lines entering and leaving the pipe way (Sleepers). Lines would be pocketed when this should be avoided and there would also be a "waterfall" wall of piping on each side of the rack and running the length of the unit.

All in all I think that, with some thought you will decide that "Sleepers" in a complex process unit would not be a good thing.
Do it once and Do it Right

Jop, Thanks a lot for your 11 years 3 months ago #4661

  • alexsel
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Jop,

Thanks a lot for your crystal clear clarification. I have one more query:

In some of the plants there are a combination of both pipe racks and sleepers, for example in one of the small oil and gas separation projects being executed by my organisation, the inlet oil and gas mixture to the plant is laid on sleepers and the export gas pipeline from the plant to the battery limit is laid on sleepers. Even the piping within the sterile zone of the flare is laid on sleepers. Whereas, all the main piping in the plant is laid on pipe racks.

What do you think could be the guideline for this kind of combination?

Regards,

alexsel

You asked, (Re. Sleepers vs. 11 years 3 months ago #4664

  • Jop
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You asked, (Re. Sleepers vs. elevated Pipe Racks)
"What do you think could be the guideline for this kind of combination? "

The difference is the geographic location within the plant site. By this I mean elevated Pipe Racks are the choice for Onsite Units (complex process units) and Sleepers are the choice for Offsite areas (Tankage, Flare and transfer areas).
Do it once and Do it Right

One point I think is 11 years 2 months ago #4680

  • banerj1s
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One point I think is important in this case too is Access. The reason that rack is preferred over sleeper in ISBL is because it doesnt hinder machine or personnel movement.

Cheers
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