bids are invited for custom bid for services - annual maintenance contract of pky tester oxygen booster pumps; it consists of following parts: (a) pressure guages p1(range 0 to 30 bar), p2 (range 0 to 10 bar) and p3 (range 0 to 2000 mm of wc) (b) flowmetres f1(range 0 to 6 lpm) f2 (range 0 to 200 lpm) f3(range 0 to 200 lpm) to monitor vacuum flow and f4 (range 0 to 1000 cc per min) (c) stop valves 05 in nos needle valves (s1, s2,s3, s4, s5) (d) pressure reducing valve (prv): make: shavos regulator unit model: 11-4snr type: spring loaded throttle valve range: 0.7 to 7.00 kgf/cm² air drying unit: (a) moisture and humidity filter: make: shavos vayu standard series model: sb60 operating pressure range: 17.5 kgf/cm² (b) oil filter: make: shavos vayu coalescing type oil filter model: sf60c operating pressure range: 17.5 kgf/cm²