The 2012 edition of IS 950 outlines the operational criteria for Water Tender Type B fire vehicles used by fire brigades in metropolitan and industrial settings, emphasizing high water output and agility. It details guidelines on design parameters, materials, fabrication, pump capabilities, onboard equipment, and safety measures to guarantee dependable firefighting performance. This code is vital for manufacturers, engineers, and fire department personnel involved in specifying, acquiring, and sustaining such water tenders.
Overview
The 2012 edition of IS 950 outlines the operational criteria for Water Tender Type B fire vehicles used by fire brigades in metropolitan and industrial settings, emphasizing high water output and agility. It details guidelines on design parameters, materials, fabrication, pump capabilities, onboard equipment, and safety measures to guarantee dependable firefighting performance. This code is vital for manufacturers, engineers, and fire department personnel involved in specifying, acquiring, and sustaining such water tenders.
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Frequently Asked
According to IS 950, Water Tender Type B must have a water tank capacity ranging from 4,500 to 7,000 litres depending on the chassis type. The pump discharge configurations include three options: (a) 2,000 litres per minute at 0.7 MPa plus 300 litres per minute at 3.5 MPa, (b) 3,000 litres per minute at 0.7 MPa plus 300 litres per minute at 3.5 MPa, or (c) 4,000 litres per minute at 0.7 MPa plus 300 litres per minute at 3.5 MPa. Additionally, the vehicle must be equipped to carry an extension ladder and be capable of towing a trailer pump.
IS 950 prescribes the use of stainless steel for all pipelines to guarantee corrosion resistance. Valves with sizes up to 5 mm must be constructed as three-piece stainless steel ball valves, while valves larger than 5 mm should be standard butterfly valves. All parts that come into contact with water are required to be stainless steel, and any metallic components exposed to the atmosphere must either be made from corrosion-resistant materials or treated suitably to resist corrosion. This selection ensures durability and long-lasting performance of water handling components.
The water tender must maintain stability without overturning when tilted up to 30 degrees from a horizontal plane under fully equipped and loaded conditions excluding the crew. The water tank should be mounted on a full-length mild steel runner fixed to the chassis and supported by a minimum of three cross members to resist chassis flexing. Internal baffling comprising at least four baffles (two longitudinal and two transverse) is required to minimize water surge during maneuvers, thereby enhancing stability. The vehicle must also meet dimensional constraints such as a maximum wheelbase of 4,500 mm, width not exceeding 2.5 m, and a minimum road clearance of 230 mm. Braking performance must ensure stopping within 15 meters from 48 km/h on dry surfaces, and the hand brake must hold the vehicle on a 1 in 4 gradient in neutral gear.
IS 950 requires the water tender to be equipped with a comprehensive set of accessories including suction hoses with couplings, 3-way suction collecting heads, suction wrenches, suction strainers, basket strainers, delivery hoses with specified couplings, dividing and collecting breechings, hydrant standpipes, hose clamps, and bandages. Branch pipes and nozzles, such as fog nozzles, universal branch pipes, and foam making branches, must also be included. Safety and operational equipment encompass portable dry powder fire extinguishers, self-contained breathing apparatus with spare cylinders, hand lamps, flameproof lamps, first aid kits, protective gloves, and combined keys for hydrants and valves. Additionally, a variety of tools like axes, crowbars, sledge hammers, saws, spanners, hydraulic jacks, and fire hooks must be provided to facilitate firefighting and maintenance activities.
Pump performance under IS 950 is evaluated by continuous operation tests where the pump runs for 3 hours at 0.7 MPa delivering rated capacity and for 1 hour at 3.5 MPa with a 3-meter lift, without replenishing cooling water. The efficiency tolerance permitted is ±15% around the manufacturer's specified efficiency, with a mandated minimum efficiency of 60%. Hydraulic pressure testing at 2.1 MPa verifies the integrity of the pump casing and impeller. Temperature limits for engine oil, cooling water, and PTO sump oil are specified to avoid overheating during tests. Furthermore, pumps must have thermal relief valves to regulate water temperature below 48°C (or 80°C if justified), and components in contact with water must have smooth, crack-free stainless steel castings to ensure reliability.
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