Balance and shut down work of Re-routing of Insulated chilled water piping comprising Supply, installation, testing and commissioning of Insulated chilled water Air-conditioning pipe and valves towards A,B and C Block buildings at TIFR, Colaba,Mumbai

Supply of M.S. Vessel- Cutting, Welding and connection of existing insulated header pipes (2nos.x200mm + 4nos.x150mm bare pipe sizes) inside the tunnel near AC plant with newly laid header (2nosx300mm sizes) including making vertical header inside the trench of not less than 16” pipe size (2 Nos.) with insulation by engaging 2 team (2Welder+3 Fitter+3S.skilled-7 Days)

Cutting and welding for Dec- 10 tapping of 2 Nos. 150mm bare pipes from the existing 150mm chilled water header near the AC plant trench, for future parallel connection of header nos 5&6 by engaging 1 team (1 Welder +2 fitter +2 S. skilled-5 Days)

Cutting & Welding for tapping of 2Nos., 150mm (bare pipe size) from 300mm size chilled water header near ‘D’ block for future connection of header nos. 9&10 (DEC10 Area) by engaging 1 team (1Welder+2fitter+2S.skilled-5 Days)

Cutting welding and joining of 2 Nos., 8” size each & 2 Nos., 6” size each existing chilled water pipe headers (bare) by 2 Nos., 8” size each new chilled water header at the ceiling of canteen room by engaging 1 team (1Welder+2 fitter+2S.skilled-7 Days)

Cutting & welding of existing 6” size headers for ‘B’ block at block basement with new similar size header by engaging 1 team (1Welder+2fitter+2S.skilled-5 Days)

Cutting, welding, and joining of existing AHUs/FCUs header connections with main supply & return headers including supply & installation of connection pieces, if required, for the following AHUs as per tender specification by engaging 2 team (2 Welder+3Fitter+5 S. skilled-7days)

West lecture hall+Direc. lab (bare pipe size: 2” i.e.50mm)

‘B’ Block Gr. & 1st floor &FTNMR-LTF (bare pipe size :4” i.e. 100mm)

East lecture hall (bare pipe size: 3” i.e.80mm)

AB72 & Prof. KP Sing lab (bare pipe size: 2” i.e. 50mm)

A’ Bl. 2nd &4th Floor FCUs (bare pipe size: 6” i.e.150mm)

M&L AHU at basement (bare pipe size :8” i.e. 200mm)

Stack & Library&W. canteen (bare pipe size :3” i.e. 80mm)

TSR Admin office (bare pipe size: 2” i.e. 50mm)

W/canteen & library Tapping (bare pipe size :4” i.e. 100mm)

Trench piping: - Supply, Installation, Testing & Commissioning of Tata/Jindal/Sail make welded mild steel ERW tube (black steel) class “C” heavy class as per I.S: 1239/ 3589 with latest amendment These pipes shall be factory rolled & fabricated from M.S. sheet. the scope includes fittings like elbow, reducer, tee joints, supports, etc. of approved make with necessary welding work as per specifications. (The piping is to be laid inside underground RCC trench one above other leaving clear space between the headers. The civil work like excavation, refilling, RCC trench work, concrete blocks for covering the trench, etc. shall be in the scope of TIFR)

Nominal Pipe size 300mm dia

Trench piping: - Only#ITC Installation, Testing & Commissioning of Tata/Jindal/Sail make welded mild steel ERW tube (black steel) class “C” heavy class as per I.S: 1239/ 3589 with latest amendment These pipes shall be factory rolled & fabricated from M.S. sheet. the scope includes fittings like elbow, reducer, tee joints, supports, etc. of approved make with necessary welding work as per specifications. (The piping is to be laid inside underground RCC trench one above other leaving clear space between the headers. The civil work like excavation, refilling, RCC trench work, concrete blocks for covering the trench, etc. shall be in the scope of TIFR)

Nominal Pipe size 150mm dia

Trench Pipe Insulation: - Supply & Fixing of Insulation on duly welded & pressure tested black pipe (Item no.3 above) by ‘Beardsell/Lloyds make, 75mm thick, ‘TF’ quality, 32 Kg per cub. meter density, Expanded Polystyrene (Thermocol) covered with 500-gauge polythene faced hessian (The polythene facing outward) with 50mm overlap. All the joints to be sealed with Bitumen. A layer of 0.50mm by 20mm G.I. wire mesh netting should be provided over it butting all the joints and it should be laced by GI wire , sand cement plaster (ratio 1:4) of total 20mm thick ( 2 layers of 10mm thick each) and shall be water proofed by applying hot bitumen/coat of Shalibond or approved adhesive, over the plastered surface; wrapping one layer of fiber glass RP tissue & one layer of minimum 2mm thick roofing tarfelt of approved make with sufficient overlap, set and sealed with adhesive, held in position by 16 Gauge SS304 wire tied at 15cm interval. Finally, it shall be finished by the coat of hot bitumen

Nominal Pipe size 300mm dia

Trench Pipe Insulation: - Only Fixing of Insulation on duly welded & pressure tested black pipe (Item no.3 above) by ‘Beardsell/Lloyds make, 75mm thick, ‘TF’ quality, 32 Kg per cub. meter density, Expanded Polystyrene (Thermocol) covered with 500-gauge polythene faced hessian (The polythene facing outward) with 50mm overlap. All the joints to be sealed with Bitumen. A layer of 0.50mm by 20mm G.I. wire mesh netting should be provided over it butting all the joints and it should be laced by GI wire , sand cement plaster (ratio 1:4) of total 20mm thick ( 2 layers of 10mm thick each) and shall be water proofed by applying hot bitumen/coat of Shalibond or approved adhesive, over the plastered surface; wrapping one layer of fiber glass RP tissue & one layer of minimum 2mm thick roofing tarfelt of approved make with sufficient overlap, set and sealed with adhesive, held in position by 16 Gauge SS304 wire tied at 15cm interval. Finally, it shall be finished by the coat of hot bitumen

Nominal Pipe size 150mm dia

Outdoor/inside building: - Only #ITC of chilled water piping with Tata/Jindal make M.S. `C` class, E.R.W., complete with all fittings, Hot dipped galvanized support and welding work and shall be covered with ‘Beardsell/Lloyds make, ‘TF’ quality, 32 Kg per cub. meter density, Expanded Polystyrene (Thermocol) covered white Fiber cloth of 10mil thickness with one coat before wrapping the fibre cloth and two coat after wrapping of Star Bond 3036 (Paramount make), covered 120 gm/sq.m polythene sheet as vapor barrier with 50mm overlap. The final insulated pipe surface shall be finished with cladding of 0.63mm thick AL sheet duly grooved & overlapped on joint and stripped by SS stripping sheet of 25mm width. The Nominal size of pipe with thickness of insulation are as follows;

200mm NB dia with 75mm thick insulation

150mm NB dia with 75mm thick insulation

100mm NB dia with 65mm thick insulation

80mm NB dia with 50mm thick insulation

Outdoor/inside building: - SITC of chilled water piping with Tata/Jindal make M.S. `C` class, E.R.W., complete with all fittings, Hot dipped galvanized support and welding work and shall be covered with ‘Beardsell/Lloyds make, ‘TF’ quality, 32 Kg per cub. meter density, Expanded Polystyrene (Thermocol) covered white Fiber cloth of 10mil thickness with one coat before wrapping the fibre cloth and two coat after wrapping of Star Bond 3036 (Paramount make), covered 120 gm/sq.m polythene sheet as vapor barrier with 50mm overlap. The final insulated pipe surface shall be finished with cladding of 0.63mm thick AL sheet duly grooved & overlapped on joint and stripped by SS stripping sheet of 25mm width. The Nominal size of pipe with thickness of insulation are as follows;

50mm NB dia with 50mm thick insulation

Supply & Installation of following sizes ‘AUDCO’ make, Worm Gear operated (Heavy Duty), PN16 rating, Butterfly valves having Cast Iron/SG Iron body, Nitrile rubber bonded Bakelite hard back or molded EPDM Seat, Disc should be made of SG Iron or AL. Bronze with Epoxy powder coated or Nickel plated, Shaft of the valve should be SS, AISI 410. The installation of valves includes Supply & Fixing Insulation with all other accessories like M.S. flanges, gasket, bolts, etc. complete with cutting & welding work. (Valves as mentioned in Sr. Nos. 13.1 and 13.2 ,as below, will be provided by TIFR)

300mm dia with 75mm thick insulation

150mm dia with 75mm thick insulation

100mm dia with 65mm thick insulation

80mm dia with 50mm thick insulation

50mm dia with 50mm thick insulation

Supply of following Sizes, PN16 rating, ‘Advance’ make, balancing valve having Cast Iron body & Bonnet, EPDM seating disc, AISI 410 (SS-410) Stem The installation of valves includes Supply & Fixing Insulation with all other accessories like M.S. flanges, gasket, bolts, etc. complete with cutting & welding work. (Valves as mentioned in Sr. No. 14.2 ,as below, will be provided by TIFR)

150mm dia with 75mm thick insulation

100mm dia with 65mm thick insulation

50mm dia with 50mm thick insulation

Fabrication and installation of chilled water piping suitable size channel/Angle supports made out of hot dipped galvanized structural steel. The galvanizing should be minimum 180 Grams/sq.meter (GSM). Full welded piping support to be sent for galvanizing.

Cutting, welding and blank off the existing AC pipe headers after new pipe connection work is completed in tunnel & Basement area. (2 nosx200mm & 6 nosx150mm)

Removal, lifting & shifting to the designated AC piping from inside the building basement of A & B-Block having pipe sizes of like 200mm, 150mm & 100 mm etc. Including whether there are new pipe crossings in your shutdown jobs involving existing AC pipes, (Appx.length 200 meter)

Excavation of earth removal soil/gravel areas in the existing piping route depth between min.075m to 1 mtr. And refilling the trench/earth with already excavated.

Demolishing brickwork manually/by mechanically and disposal of waste soil/debris to approved TIFR scrap yard

Air-O-Mec Engineers (BID ID -3314843)