Pipe Rack Design Philosophy-Modular

Pipe rack DesignPhilosophy (Modular Pipe rack) In this page I will talk about about the Modular piperack system. I hope hope you have read the Conventional pipe rack systemdesign system design philosophy. If not, please read that section before. Modular Pipe rack Sometimes clients look for modular pieprack / modular structure for their plants. ut do you know what is a module!Module is a series of standard units that function together. "#amples are$ uilding modules$ Structural %rames completely fitted fitted with Miscllaneous e&uipment and and architectural finishes. Piperack Module$ Structural %rames completely fitted with pipes, Cable trays and miscellaneous e&uipment. 'ow the &uestion is , why do we go for modular structure sometimes! (ere are some reasons$ If the pro)ect site is at remote location, then it will be very difficult to get good local contractor. Parallel construction activities are possible *foundation and module fabrication+ and gain in time schedule • •

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Controlled construction environment is possible

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Controlled &uality controlled

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In some countries, labour cost at site is more than labour cost at fabrication / module assembly shop. So, if you fabricate and fit all the pipes , cable trays etc. at shop, then you can save the pro)ect cost.

(owever, there are some disadvantages also and these are$ ate changes in design has huge effect on structure and module assembly. -ransportation cost from module shop to site may be very high. • •

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-ranspo -ra nsportat rtation ion time needs to be considered in total pro)ect schedule.

Piperack Module -ransportation$ Module can be transported by roadways roadways and waterways. I have have some e#periences in roadways piperack module transportation. transportation . In lberta province *Canada+ 011 ft *long+ # 23 ft *wide+ # 24ft5 in *high from road surface+ P6M can be transported by truck from module yard to site. Please click here for different module shipping envelope envelope.. Piperack Module ifting$ 4 point lifts are preferred and 7 point lifts are second preference. 6 and 10 point lifting are difficult and should be avoided. 4 point lifts reduce rigging cost and associated manpower during setting. 4 point lifts result higher crane capacity and safer lifts due to shorter boom re&uirements. 6egardless of the length, typical self supporting bridge truss style pipe rack modules use 3 lift points located at the top of the modules columns in the webs. y lifting at the same location that the module is supported insitu, the force distribution throughout the module is similar to the insitu design, e#cept that the module columns are in compression instu and reversed to tension during a lift. Please click here for 3point module lifting . %ollowing are some steps to design the Modular pipe rack$ Step0$ 8ata collection for pipe rack design$

Method of 8ata collections is same as Conventional pipe rack system. Please look into 98 model and collect all the data as re&uired. Step2$ 8esign loads consideration$ %ollowing loads are to be considered for the nonconventional pipe rack design$ :ravity load *8+$ %or :ravity load calculation, refer Conventional pipe rack system ;ind oad *;+$ %or ;ind load calculation, refer Conventional pipe rack system, "arth&uake oads *"+$ %or "arth &uake load calculation, refer Conventional pipe rack system. %riction oading *-f+$ %or %riction load calculation, refer Conventional pipe rack system.  nchor and :uide oads *-a+$ %or nchor and :uide load calculation, refer Conventional pipe rack system, -ransportation loads$ ;hen piperack modules are transported on the road, different types of horither than these hori
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You need to check the Factor of safety againgst overturning during transportation and value should be more than 1.5 . "rection loads and lifting points$ In this case we generally consider a vertical impact load *load factor  0.A+ on module. Step  9$ oad Combinations and allowable deflection of pipe rack$ %or oad combinations and allowable deflection of Modular pipe rack for insitu analysis and design, refer Conventional pipe rack system, Modular pipe rack to be analysed for transportation and for lifting also. ifting load combinations$ C0  2.1 # -otal dead load *ultimate load combinations for member

design per Canadian steel code CISC / 'C 4A+ -ransportation load combinations *ultimate load combinations per CISCCanadian steel code / 'C 4A for member design++$ C0$ C2$ C9$ C3$ CA$

0.2A # 8ead load B 0.A # I? B 0.A # I 0.2A # 8ead load B 0.A # I? B 0.A # I0.2A # 8ead load B 0.A # I? B 0.A # ;ind 0.2A # 8ead load B 0.1A # I? B 0.1A # I- B 0.1A # ;ind 0.2A # 8ead load B 0.1A # I? B 0.1A # I B 0.1A # ;ind

 Above load combinations are for reference only. You need to follow your project design criteria for the pipe-rack analysis and design. Step  3$ %rames of Modularl pipe rack$

lease click here for typical modular pipe rack sketch.

Conventional Pipe rack conventional Pipe rack

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Copyright 2009. All rights reserved. Please do not print or copy of this page or any part of this page without written permission from Subhro Roy. isclaimer! "his page is prepared based on e#perience on Civil $ngineering esign. All definitions and most of the e#planations are ta%en from different te#t boo%s and international design codes& which are referenced in the contents. Any similarity of the content or part of with any company document is simply a coincidence. Subhro Roy is not responsible for that.