annual rate contract for general mechanical maintenance work.--1 transprt equip/mtrl upto 500 m in plant 2 transprt equip/mtrl int.well 1000 m out 3 fabrication/erection of steel structure 4 dismantling of steel structure 5 cutting of metals by (gas/elec) upto 10 6 cut. of metal by cutting wheel upto10mm 7 arc welding in[ss/cs/al/ms ] upto 10mm t 8 gas welding on copper tube (ac unit) 9 tig welding any metal by 3mm filler rod 10 material build up/hard facing any metal 11 erection of new equipmen