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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.
Piperack 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+ # 24ft5 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.. Piperack 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 manpower 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 insitu, the force distribution throughout the module is similar to the insitu design, e#cept that the module columns are in compression instu and reversed to tension during a lift. Please click here for 3point module lifting . %ollowing are some steps to design the Modular pipe rack$ Step0$ 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. Step2$ 8esign loads consideration$ %ollowing loads are to be considered for the nonconventional 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 piperack 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 insitu 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 CISCCanadian 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.