I want to know some basic thumb rules to give pipe rack loading to structural, without doing any formal stress analysis.

I heard about some UDL concept but do not much

Any help will be highly appreciated.

Thanks,

Vertical Loads:
Generally Pipe size 10" Lines and below are given as UDL and other larger bore dia as point load.

Incase you want actual UDL for Pipe size 10" and below pipes,
calculate the dead weight,operating and hydro weight considering pipes to be supported as simply supported beam.
Based on the intermediate beams(span) and pipe rack width (occupied width) covert reaction to UDL either KN/m2 or KN/m.
In case of vertical load (UDL) for Dia 10" and below a minimum of 1.75KN/m2 may be used.

Horizontal loads:
For high temperature lines(typically greater than 200 Deg C) and Pipe size greater than 10", perfrom stress analysis to get lateral loads and axial loads,
For other lines(<=10") use limiting friction value to get horizontal loads.


Hope this helps.

stressguy81:

can you provide some standard guide for your instruction?

thanks

b regards

Vertical loads:
While doing pipe rack loading/ sleeper loading for Proposal jobs or early stages of detailed engineering, getting Actual "Point loads" of all critical/non critical lines may be time consuming and difficult (lack of input availability).

UDL format loading (Typically Pipe size 10" and below) helps us to give estimated load more accurately. (Since Ex: In a bunch of 7 lines, if some line sizes increase/decrease effective change in UDL would be less and In case of change in the spacing between pipes changes or line is moved across the section of rack, the UDL will have little changes)

Typically for a Rack, vertical load (UDL) for Dia 10" and below a minimum of 1.75KN/m2 is good to go.

UDL format loading:
Total Ope weight (kg/m)=Density of Pipe Material (kg/m3)* Metal Area (m2)+ fluid wt (Fluid density *C/S area) +Insulation wt (if any)
Total Ope weight (kg/m) = Total weight* Factor (1.1)
Total Ope weight (kg/m2)=Total Ope weight (kg/m)/Occupied width
Similarly calculate HYD Weight and Empty Weight.

Horizontal loads:

Fix guide bays and anchor bays initially,
Upon fixing them, for Pipe size 10"and below (temperature <200 Deg C) use limiting friction as guide/limit load.
For other lines,
Perform stress analysis to get lateral loads and axial loads.