Big size pipe in Pipe Rack 1

[ingdaniel]

Hi all,

Is there any guideline or practices for what is the bigger size pipe that can be use in pipe racks?

in this presentation recommend 30" water lines:

http://www.whatispiping.com/rack-piping

Best regards

 

[racookpe1978]

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Pipe Rack and Rack Piping: A presentation

29th October 2014




This is a small presentation on Pipe Rack and Rack Piping. It will be very helpful for the beginners into piping industry. This article will cover the following points in brief:

That is a very, very simplified training presentation on "how to design pipe racks" ...
It uses - as an example for training - a single large water and a handful of smaller pipes, and presents a series of useful "thumbrules" ....

Why do you think pipe racks are limited to 10, 20, 30, 40, 60, or 72 inch diameter? They are limited to "how to route, run, and support pipes" so "they go here to there and don't break and can be built"?

 

[pennpiper]

ingdaniel,
You asked:
Is there any guideline or practices for what is the bigger size pipe that can be use in pipe racks?

The answer to your specific question regarding pipe size limitation on Pipe Racks is 'No' there is no limit.

However there is always good engineering practices and judgement that needs to be observed to insure a proper design.
Example:
[ul]>Pipe of any size with a thin wall may need saddles or cradle shaped reinforcement so the wall does not collapse
>Large diameter pipe lines should be evaluated for proper lateral restraint on projects located in earth quake prone areas and on Offshore rigs [/ul]

Sometimes its possible to do all the right things and still get bad results

 

[racookpe1978]

At a certain point in time, it is no longer practical and is too expensive to place extremely large (heavy!) pipes in a pipe rack high above ground requiring very heavy and very expensive pipe and structural supports just to run trucks and rail cars underneath, than it is to run those same very large pipes close to the ground (or underground) and run the trucks and trains over top of the large pipe.

At that point, the very large, very heavy pipes are run separately from pipe racks at (or under) ground level, and the smaller pipes are run up in the pipe rack. Water cooling pipes are usually the first to be run underground, since the energy to pump cooling water up high in large pipes on expensive pipe structural supports and piers is very, very high.

 

[bimr]

One other point is that if you have large pipes in the rack, the difference between the piperack levels increases.

A rule of thumb when deciding the elevation difference between piperack levels is 3 times the largest Nominal Pipe Size (NPS) of pipe that runs in the rack. The stringer levels, the steel beams between columns that support the pipes leaving the piperack, are set mid-way between the main beam levels or 1-1/2 times the largest NPS pipe. This allows that the largest pipe can be rolled out of the rack with a fitting –to-fitting LR 90 degree elbow and a 45 degree elbow and that a pipe size of half the largest NPS pipe can use tow fitting –to-fitting LR 90 degree elbows to leave the rack.

For a 30-Inch pipe, the elevation difference between main beam levels will be 2286 mm. Given that there has to be space to work within the piperacks, 1220 mm between levels is probably the minimum necessary.

 

[ingdaniel]

Thanks you all for this comments....

 

[BigInch]

Unless other more specific information is available, the sverage refinery-type piperacks are usually designed for around 40lbs/ft2 on each level, representing a typical mix of pipe sizes with liquid (SG = 1) inside all pipes, or 20 psf for cable tray levels. If you have any pipe (or cable) that gives an equivalent psf load bigger than those, then you need to add it specifically as an additional designated point load to the supporting beam.

you must get smarter than the software you're using.

 

[IFRs]

We put 36" lines on racks all the time, sometimes in multiples, next to multiple 24" and 16" lines, on the first, second and third level, on bridges over roads. Most lines get shoes, heavy and high lines get shoes with Teflon slide plates. I have not done larger than 36" but I see no real limit other than cost. We go underground only when needed. Grade level racks on sleepers sometimes.

 

[BigInch]

Think of all the money you could save by going underground.

you must get smarter than the software you're using.

 

[IFRs]

Most of our lines are steam traced and insulated, racks are designed for future expansion which has happened many times as new tank fields, pipeline tie-ins and docks are constructed, we have eschewed underground for a boatload of reasons.