Modular Pipe Rack

Field welding would be "great" if the welder had enough access 360 Deg.s around every pipe in this module, AND IF that's the way it has to be then you better design that aspect into the module design, but you're going to burn up alot of space in the piperack!
NO FLANGES?? ...So what is the system pressure?

Here is a link I found showing a 60' module with pipe sizes ranging from 2" to 48". Also, SPMT transporting module through plant-site. Normally, we use normal pipe spacing and do not provide addition space for field weld. Pipe fitters use to these module fit-ups are able to manage.

www.westheatherbrae.com/blog/?currentPage=7

@Shrivalabha.......the Pipe rack is already designed according to the loading I am dividing it into four parts along with piping ,supports cable trays and all.
so i am not so concerned about calculation and theortical part ;my main concern is practical one.
@ Willis .....thanx a ton boss ur feedback are quite impressive.

few other queries:---
In this module concept i would have to do hydrotest twice once at shop and then at site Does ASME permits that?

Do you really think its equivalent that i make four spools and then weld them at site by maintaining proper slope of arnd 3% in pipe
OR by making a long spool at shop having the slope of 3% then cutting it into four parts and again joining them on site

Regards
SG
" Be not afraid of going slowly; be afraid only of standing still"

If the commodity is high pressure, high temp steam of say 320 degrees C then I agree there should be no flanges. A line like that would have all welded connections, even the valves. Pinhole leaks from flanges could be serious HSE concerns as well as difficult to locate.
Field welds would be the best way to mate the modules. If you are concerned for fit up make it a field fit weld and add say 300mm of pipe which is cut in the field and welded.

With 3D models we now get precision and accuracy with module installation. If it works in the model it should in the field. As for shims be careful with the shoe movement. If you have a high temp line then you can get considerable thermal movement. You can also get uplift and your guides have to be designed accordingly. You may have a long shoe to accomodate movement. The project I am working on has steam lines which are moving up to 1.5m for a 36" line so our shoes are 900mm long in places.

Dear all,
Challenging part in modular piperack, we are into it right now (Define phase of the project) & found that how troublesome this part of modularization is!

In this modular concept we have to do hydrotest twice once at shop and then at site? Is that true? Is hydrotest at shop is enough?

High pressure Temp piping---no option except field welds. Access for welding---staggering of pipe ends will work?

For flanged joints (wherever acceptable) joining piperack modules is not a real trouble.

We need experts to advice on this front. Thanks in advance.

Pipe rack modules would usually be spaced 6M apart. The field weld is on the overhanging pipe between modules of 3M. Sloping lines are not an issue as we do these all the time especially flare lines. There are different ways and methods to support and slope the lines. Trimmed shoes, shims, goalpost supports are all used on modular racks. The piping gets tack welded in shipment which is easily broken at site for movement of the pipe to align for field welding.
As for hydro testing it is normal to hydro the module seperately and then do a system hydro test once installed at site.
We would normally build a 3 bay module which are 6M long each per bay. This would then get shipped to site with a 6M gap between mods.
The rack gets lifted on to it's piles and the pipng then lined up. This is routinely done in this part of the world with piperacks that can be 5 levels high and double wide.
Dimensions must match shipping sizes on the roads in the area which you are constructing. There can also be seasonal road bans which can affect transportation.
Hope this helps.