PERIODICAL SERVICING, MAINTENANCE AND REPAIRS TO AIR HANDLING UNITS OF VARIOUS CENTRAL AIR CONDITIONING PLANTS AND CERTAIN OTHER WORKS AT NAVAL DOCKYARD VISAKHAPATNAM

Amount

Material and labour for servicing of air handling units comprising of thoroughly cleaning of body 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 all as specified and directed.

Supply & fix 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 all as specified and directed. [Make : Zeco/Voltas / Carry Air / Sudha Air]

Material and labour for cleaning of AHU room on monthly basis comprising of inside wall, ceiling, floor with suitable brush/broom/wiper, removing wild vegitation inside the building complete all as specified and directed.

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

Supply and fix filter section consists of profiler with 10 microns of particles 90% efficiency stainless steel drain pan suitable for 600 x 600 x 50 mm nylon mesh including taking down the old unserviceable filter section all as specified and directed.

Supply, fabricate and erect MS supports (such as channel, angle, flats etc.,) to supply/return air duct including painting to steel surfaces with two coats of synthetic enamel paint over a coat of zinc chromate primer including dismantling existing corroded MS supports all as specified and directed

Supply and fix chilled water MS galvanised pipe line of 150 mm bore medium grade 4.85 mm thick with flanged joints with flange of 10 mm thick and rubber gasket of ‘Neoprene’ make, nuts, bolts and washers including taking out corroded pipe line complete all as specified and directed.

Material and labour for taking out damaged insulation portion of existing refrigerant line / chilled water pipe line for the following sizes, and cleaning the pipe and insulation with thermocole pipe section TF quality waterproof around pipe and fixed with GI wire mesh, plastering with cement mortar 1:4, 15 mm thick, finished smooth and duly painted with two coats of cement based paint and removing dismantled materials from Dockyard premises all as specified and directed.

50 mm bore

65 mm bore

80 mm bore

120 mm bore

150 mm bore

Material and labour for complete checking, servicing/ rectification of electrical circuits for all units and control wiring with proper lugging of AC plant control panel including replacement of fused indication lamps with new ones, cleaning of all power contacts, rectification of minor defects in Ammeters and Voltmeters, testing and commissioning all as specified and directed. [Note :- Material such as indication lamp, ammeter, voltmeter shall be measured and paid separately].

Material and labour for repairs and servicing of blowers including dismantling, replacement of worn out bearings and checking of alignment complete all as specified and directed

Supply and charging of R-22 gas all as directed [Make:- Refron 22/Floron 22/Mafron 22]

Material and labour for cleaning of AHU duct grills, filters on monthly basis comprising of thoroughly cleaning by air blow with electric air blower and water jet dripping up the AHU complete all as specified and directed.

Supply only indication lamps (LED type) red, yellow and blue in colours of 22.5 mm dia to monitor on LT panel board suitable for 240 V AC supply and taking down unserviceable indication lamps all as specified and directed. [Make:-Siemens/C&S/schneider/ABB]

Material and labour for disconnecting, taking out the blower motors for the following capacties from air handling units, tranportation 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 all as specified and directed :-

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

Material and labour for bldg internal painting of old painted plastered or unplastered surface of walls with one coat of cement based paint including necessary preparation of MES installation buildings complete all as specified and directed.

Material and labour for bldg internal painting of old painted plastered or unplastered surface of ceiling with one coat of white wash including necessary preparation of MES installation buildings complete all as specified and directed.

Supply and fix filter section consists of profiler with 10 microns of particles 90% efficiency stainless steel drain pan suitable for 500 x 630 x 50 mm nylon mesh including taking down the old unserviceable filter section all as specified and directed.

Supply and 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 whereever required all as directed. Make : Sporlon/Donfos

Supply and fix following expansion valve of Sporlon make with necessary modification, brazing ,leak testing and commissioning including taking out the old unserviceable expansion valve all as specified and directed.

VVE- 70 model

VVE- 52 model

Supply and fix belt driven set with pullys, bearings etc., suitable for 10 HP motor and ADH 630 model blower including taking down the old unserviceable belt driven set all as specified and directed.

All as per item No. 23.00 above but for 20 HP capacity motor

Supply and fix chilled water coil suitable for 14000 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 all as specified and directed.

Material and labour for insulation with 50 mm thick (TF quality) fire resistant thermocole duly fixed with approved quality adhesive including applying a coat of bituminous paint, necessary hardware for fixing thermocole on return air duct of alkathene sheet of 0.05mm thick wound with 25 SWG GI chicken wire mesh and plastering in CM (1:4), 10 mm thick to the wire mesh surface on wall/roof any height complete all as specified and as directed.

M&L for provision of insulation on supply air duct with 25mm thick fiber glass having factory aluminum foil on external face of the insulation on wall/roof any height complete all as specified and directed.

Supply, fabricate and erection of supply and return air ducts of any size and shapes made out of GI sheet of 0.71mm thick including jointing, reviting, GI nuts, bolts and washers as required at site including taking down the old corroded duct of any size on wall/roof any height complete all as specified and directed.

Srinivash Engineers

CHAVA CONSTRUCTIONS AND ELECTRICAL PROJECTS

ANAND ENTERPRISES AND ENGINEERS

VENKATESWARA TECHNOLOGY

SRIESWARI ENTERPRISES

bhavani constructions

REAL ENGINEERING WORKS

SRIVEN TECHNOLOGIES

UNIVERSAL ENTERPRISES

SRI SIDDHI VINAYAKA ENTERPRISES