REPAIR REPLACEMENT OF AHUS AND MISC MAINTENANCE WORKS OF VARIOUS CENTRAL AC PLANTS AT NAVAL DOCKYARD VISAKHAPATNAM

Amount

Supply and fix shaft, DE and NDE bearing with bearing housing suitable for 26000CFM capacity AHU including taking down old unserviceable shaft with existing bearing from AHU complete all as specified and as directed.

Supply & fix DIDW centrifugal fan with air discharge upblast with necessary modification of fan distance piece to AHU including taking down the old unserviceable centrifugal fan suitable for 26000 CFM AHU complete all as specified and as directed. [Make : Zeco/Voltas / Carry Air / Sudha Air]

Material and labour for repairs and overhauling of 20 HP capacity motor by disconnecting and taking out from the bed, replacement of worn out bush / ball bearing, lugs, studs, bolts etc., re-installing on it's original position including painting the motor body with one coat of synthetic enamel paint, connecting up, testing complete all as specified and as directed.

Material and labour for disconnecting, taking out of 20 HP capacity motor from the bed, transportation to workshop and removing the existing winding and rewinding with new super enameled copper wire of same gauge and same number of turns after thorough cleaning of stator body and rotor applying insulating varnish, drying up by heating for improving ohmic valve, reassembling the motor by replacement of both end bearings, including painting with one coat of synthetic enamel paint, reinstalling on its original position connecting up, testing complete all as specified and as directed.

Supply & fix belt driven set with pullys, bearings etc., suitable for 20 HP motor blower including taking down the old unserviceable belt driven set complete all as specified and as directed.

Supply & fix chilled water coil suitable for 26000 CFM capacity consists of 6 row deep coil with min 12 fins/inch tin coated copper pipe integrally grooved of 1.2 or 3.8" size including taking down the old unserviceable chilled water coil complete all as specified and as directed.

Supply & fix filter section Centre Channel consists of profiler with 10 microns of particles 90% efficiency stainless steel drain pan suitable for 610 x 350 x 50 mm 3 Nos nylon mesh including taking down the old unserviceable filter section complete all as specified and as directed.

Material & labour for servicing of air handling units comprising of thoroughly cleaning of body, air filters and cooling coils by air blow with electric air blower and water jet dripping up the AHU, painting with one coat of synthetic enamel paint on internal and external surface to the body and alignment of the blower and shaft greasing the pedestal bearing adjustment of `V' belts tension including replacement of trunking canvas with zip refixing the belt guards in position complete all as specified and as directed.

Material & labour for descaling 75 to 120 TR condensers by using HCL acid with continuous circulation method using circulation pump, finally neutralizing with fresh water, opening both end covers of shell and tube condensers, cleaning of copper tubes manually by using nylon brushes, re-fixing the end covers with new neoprene rubber gaskets, commissioning after complete performance test of the system complete all as specified and as directed.

All as per item No 9.00 above but for 30 to 50 TR

All as per item No 9.00 above but for 10 to 20 TR

Material and labour for checking the complete refrigerant system of the AC plant of 10 to 20 TR capacities, leak testing with Nitrogen gas under constant pressure of 250 PSI after complete transfer of refrigerant gas from the entire system, rectification of leakages including cutting and brazing the refrigeration system wherever required, replacement of ‘O” rings, Teflon washers of valves, copper tubing, flare nuts etc., neutralizing after the pressure holds good for atleast 24 hours, vacuumisation, charging the system with refrigerant gas, testing and commissioning of AC plant complete all as specified and as directed. Note : Refrigerant gas shall be measured and paid for separately as supply only relevant item.

All as per item No 12.00 above but for 30 TR

All as per item No 12.00 above but for 75 to 120 TR

Supply & fix in repairs pilot solenoid valve to the refrigerant system, reconnecting the refrigeration piping including, leak testing, brazing to the pipe line, necessary copper tubing etc., wherever required complete all as specified and as directed. Make : Sporlon/Donfos

Supply & fix VVE-70 model expansion valve of Sporlon make with necessary modification, brazing, leak testing and commissioning including taking out the old unserviceable expansion valve complete all as specified and as directed.

All as per item No 16.00 above but for VVE- 52 model

All as per item No 16.00 above but for TER-45

Supply only refrigerant gas Mafron-22 / Floron-22 make conform to relevant IS specifications complete all as specified and as directed.

vijetha enterprises

SRIVEN TECHNOLOGIES