The 2003 edition of IS 15397 outlines the criteria for portable mechanical foam type fire extinguishers operating on stored pressure, primarily designed to combat Class A and B fires involving water-immiscible flammable liquids. This standard details the design framework, material requirements, fabrication processes, corrosion prevention measures, performance evaluations, and labeling protocols to ensure dependable and safe operation. It serves as a vital reference for manufacturers, quality inspectors, and safety professionals engaged in the production, inspection, and upkeep of these foam fire extinguishers within India.
Overview
The 2003 edition of IS 15397 outlines the criteria for portable mechanical foam type fire extinguishers operating on stored pressure, primarily designed to combat Class A and B fires involving water-immiscible flammable liquids. This standard details the design framework, material requirements, fabrication processes, corrosion prevention measures, performance evaluations, and labeling protocols to ensure dependable and safe operation. It serves as a vital reference for manufacturers, quality inspectors, and safety professionals engaged in the production, inspection, and upkeep of these foam fire extinguishers within India.
Audience
Contents
Structure
Frequently Asked
The materials specified for the fire extinguisher components according to IS 15397 include mild steel or stainless steel sheets for the body (IS 513 / IS 6911), mild steel for the neck ring (IS 2062 or IS 1875), and forged brass, leaded tin bronze, plastic, or stainless steel for the valve body (IS 6912 / IS 318 / Annex B / IS 6529). Rubber used for washers and O-rings must be acid and alkali resistant per IS 5382. The spindle is made from brass or stainless steel (IS 291 / IS 319 / IS 6528), springs from plated spring steel (IS 4454 Part 1), and the syphon tube sheet can be brass, copper, or plastic (IS 407 / IS 1545 / Annex B). Nozzles are made from plastic or brass (Annex B / IS 291 / IS 319), and hoses are braided rubber or PVC as per IS 14933. These materials ensure mechanical strength, corrosion resistance, and reliable performance under operational pressures.
Per IS 15397 Clause 10.5.1, the extinguisher is charged with 8.450 litres of clean water plus 550 ml of 6% AFFF foam concentrate and pressurized to 10 ± 0.5 kgf/cm². Under test conditions at 27 ± 5 °C with the nozzle held horizontally, the foam must project at least 6 meters for a minimum of 25 seconds, with a minimum of 90% of the contents discharged within 60 seconds. The foam is collected in a 1 m² leak-proof tray with 15 cm sides, where the foam layer thickness immediately after discharge must be at least 50 mm, or alternatively, the foam expansion ratio should be no less than 6 as specified in IS 4989 Part 2. The hose length should be a minimum of 0.6 meters. These criteria ensure effective foam delivery and fire suppression capability.
Anti-corrosive protection as mandated by IS 15397 involves applying an epoxy powder coating with a minimum thickness of 0.050 mm on all internal and external surfaces, measured according to IS 3203. Alternatively, internal surfaces may be lined with a plastic or rubber coating at least 0.5 mm thick. Phosphating treatment per IS 3618 can be employed on external surfaces as another corrosion protection method. Validation includes an acid resistance test where samples are immersed in 10% dilute hydrochloric acid at 27 ± 3°C for 72 hours, followed by rinsing and drying. The treated surface must exhibit no discoloration, deformation, or deterioration, ensuring long-lasting corrosion resistance.
IS 15397 requires several durability and safety tests: The thread durability test involves screwing and unscrewing the valve into the neck ring 100 times without damage, followed by a hydrostatic pressure test at 4.5 MN/m² for one minute, with no leakage allowed. Thermal cycling subjects the extinguisher to 72 hours at 60 ± 1 °C and 72 hours at -5 ± 1 °C, repeated thrice with hydrostatic tests after each cycle. The pressure and performance test is conducted daily over five days to check for leaks and performance consistency. Drop tests involve dropping a filled extinguisher from 3 meters both horizontally and vertically onto concrete, ensuring no leakage. Finally, a fire test mandates extinguishing a 25-litre diesel fire within 60 seconds of discharge. These tests collectively verify mechanical integrity, pressure endurance, thermal stability, impact resistance, and firefighting effectiveness.
According to IS 15397, each extinguisher must be permanently and clearly marked with the manufacturer's name or trademark, the method of operation in prominent lettering, the phrase "Mechanical foam (stored pressure)", capacity in litres, the instruction "Recharge after use", a declaration that the body has been tested to 30 kgf/cm² pressure, and the instruction "Keep this end up". Additionally, fire class suitability letters 'A' and 'B' must be displayed: 'A' in black 25 mm letters inside a golden yellow equilateral triangle of 50 mm side, and 'B' in black 25 mm letters inside a cream-colored square of minimum 40 mm side, with paint complying with IS 2932. Year of manufacture and serial number are also required, along with pictorial instructions for operation. Optionally, the Standard Mark may be included as per BIS regulations. This ensures proper identification and user guidance.
Ask AI about any clause, requirement, or provision in IS 15397. Get instant, clause-cited responses powered by our indexed library.
Free tier includes 150 queries (50 AI + 100 Reference) · No credit card required