When all the piping specifications have been defined and initial quantities identified by the Material Take-off Group, the piping material engineer is responsible for assembling the requisition packages.
The Procurement Department will break the piping requirements into several requisitions, so that inquiry requisitions can be sent out to manufacturers or dealers that specialize in that particular group of piping components.
Pipe (seamless and welded)—carbon and stainless steel.
Pipe (exotic)—Inconel, Monel, titanium.
Pipe fittings (seamless and welded)—carbon and stainless steel.
Valves gate/globe/check (small bore, 1/2 in. and below)—carbon and stainless steel.
Valves gate/globe/check (2 in. and above)—carbon and stainless steel.
Ball valves (all sizes)—carbon and stainless steel.
Special valves (all sizes)—non-slam-check valves, butterfly valves.
Stud bolting—all materials.
Gaskets—flat, spiral wound, ring type.
Special piping items (SPs)—strainers, hoses, hose couplings, sight glasses, interlocks, and the like.
To get competitive bids, inquiries will go out to several manufacturers for each group of piping components, and they will be invited to offer their best price to satisfy the scope of supply for the requisition. This includes not only supplying the item but also testing, certification, marking, packing, and if required, shipment to the site.