NSV Industrial Shed & Office, Chakan

An industrial campus at Chakan, Pune's automobile and engineering belt, on a plot beside a 24 m road: a single-storey shed of about 157 x 56 m (roughly 8,700 m² under one roof), a two-storey office building of about 11 x 25 m, a canteen, toilets, a transformer and a DG set, with a 6 m fire drive way around the buildings. A shed of this size is a fire-engineering problem before it is anything else. It is a wide, open volume with a high roof, so a fire can spread across a large area quickly; fire-fighters need water on every side of it; and the walls themselves need protection. The architect's layout and plinth levels set the structure; our work is the fire-fighting system that protects it, and the electrical and slab services of the office building. For the whole campus we also worked out the numbers that decide what is built: the electrical load, the water demand and the sewage and storm drainage.

We designed the fire protection from the water source to the last sprinkler. Pumping: a fire schematic with a sprinkler pump, a hydrant pump, a standby pump, a water curtain pump, each of 2,850 lpm, and a 180 lpm jockey pump that holds the system under pressure, with Y-strainers, non-return and butterfly valves, foot valves, rubber bellows, pressure gauges and flow switches drawn in the order they are met on the pipe. Sprinklers: upright quick-response K-80 sprinklers rated at 68 °C throughout the shed, on branches of 25, 32, 40, 50 and 65 mm galvanised C-class pipe fed from 150 mm headers, with flow switches and valves to isolate zones. Hydrants: a 150 mm hydrant main around the shed along the 6 m fire drive way, single-headed hydrants with 63 mm instantaneous outlets to IS 5290, hose boxes with 15 m hoses and key boxes, and the stand-pipes and 150 mm butterfly valves that serve them, issued as an external fire layout and revised after a site visit. Water curtain: a 150 mm water-curtain pipe with nozzles and a deluge valve along the shed walls, on its own pump so it does not take water from the sprinklers. Fire-brigade access: 2-way draw-out, 3-way and 4-way fire-brigade inlets and hydrant valves, positioned for the engines on the drive way. Extinguishers: 15 of 6 kg ABC and 4.5 kg CO2 units placed to IS 15683, with the CO2 types for electrical areas. Office building: the ground-floor electrical fixture and conduit layout with 25 mm concealed PVC conduits, switch boards, a power distribution board with MCB and RCCB, fan points with step regulators, exhaust fans, air-conditioner points with power, control wiring and drain coordination, and separate conduits for TV, data and telephone; and a first-slab MEP layout with 200 mm sunk slabs for the toilets, an 800 x 150 mm electrical and low-voltage cutout through the slab and the staircase set out, all marked before the concrete was cast. The set was issued in March, May and August 2026. Calculations (January to April 2026): the electrical load built up from the shed's 623 high-bay lights and 700 fans, the offices, air conditioning, pumps and the production machinery - 466 kW connected and 405 kW of maximum demand, which sets a 630 kVA transformer and a 625 kVA diesel set, with a 15 kVA UPS for the office; water demand of 45 kL a day for 1,000 users, with 110 kL of underground and 25 kL of overhead storage and a 45 KLD sewage plant that returns 15 kL a day to flushing; a 17 kL basement sump sized from 30 sprinklers discharging for ten minutes; and a storm drain of 17 catch basins and 122 m of pipe.