Tender For corrigendum : supply of cooler for pa fan and fd fan lube oil system of boiler stage-1 at wtps. - double pass shell and tube water cooled oil cooler for lube oil system of p.a. fan type ndfv-22b boiler st-1 wtps, single pass shell and tube water cooled oil cooler for lube oil system of p.a. fan type ndfv-22b boiler st-1 wtps, one pass shell & tube type water cooled oil cooler of fd fan boiler st-ii wtps as per drg no:wtps-st-ii-003-03-407.