Proposed Commercial Building, CTS No. 79, Nana Peth

A commercial building on a narrow 831 sq m plot at CTS No. 79, Nana Peth, in the dense old centre of Pune, with 5,300 sq m of construction. Two basements - the lower one 6.9 m below ground - hold the parking, the stack-parking units, the tanks, the fire-pump room and the meter room; the ground floor, raised 1.2 m above the street, holds thirteen shops; and nine stores on each of the five floors above make forty-five more units, served by three lifts. On an old-city plot with neighbours on every side, deep basements, groundwater and fire safety have to be solved inside the building. The architecture is the architect's; our scope is the MEPF design.

We prepared the calculations in April and May and the layouts from August to October 2026. Power: every shop and store at 150 W per sq m of carpet area, three 5 HP lifts, the domestic, drinking-water, sewage and sump pumps, the water treatment plant, basement ventilation, 9 stack-parking units, street lighting and charging for 20% of the parking - 4 car chargers of 7.2 kW and 11 two-wheeler chargers of 3.5 kW - for 605 kW connected and 303 kW of maximum demand: 336 kVA, or 403 kVA with a 20% margin, on a 630 kVA transformer, with 59 three-phase connections; and a 320 kVA DG set for the common services with the shops and stores at 60% diversity, its 4.2-tonne dead weight and 8-tonne dynamic load passed to the structural engineer. Water: 591 people at 45 litres a day - about 27 kL - with a 41 kL domestic tank and a 100 kL fire tank, 4.5 m deep, in the lower basement, and a sewage plant sized at 30 KLD. Fire: a pump room with hydrant, sprinkler, jockey and diesel-engine pumps on common suction and delivery headers, an air vessel, the diesel tank and the engine exhaust taken out through the slab. Basement: a 150 mm trench with perforated gratings falling at 1 in 150 to three pumped sumps of 2.9 x 2.5 x 1.3 m, each with working and standby pumps, and round the lowest basement a sub-soil drain of 160 mm perforated pipe in geotextile, with weep holes, to a sub-soil sump. Floors: the internal services for every level, revised in October as the layout settled.