In our refinery we have to install new platforms and ladders to existing stacks of boilers, furnaces and heaters. This is for the monitoring of emissions from the stack. The platforms shall be installed at a minium of eight stack diameters from stack bottom.

What sort of calculations should i perform to check the stability of existing stacks for new loads.

Actually there is a debate going on who should do the job of analysis of stack. A structure engineer or a mechanical engineer with experience in design for stacks. The platform is going to be welded to the stack and structure engineer says he will design the platform but will not analyze the stack because its an equipment and an experienced equipment engineer should analyze the stack.

I want to subcontract this job and want to know what sort of calculations should I ask from the subcontractor. Actually the stacks are existing and should I ask for wind analysis of the stacks again for new platforms or should I ask for only the dead/live load analysis of the stack due to the new platform..

Regards