This standard delineates the specifications and testing procedures for high-pressure fire fighting hoses designed to deliver water at elevated pressures for firefighting applications. It encompasses requirements related to hose design, materials, performance under various stresses, and identification markings to assure reliability and safety in fire suppression efforts.
Overview
This standard delineates the specifications and testing procedures for high-pressure fire fighting hoses designed to deliver water at elevated pressures for firefighting applications. It encompasses requirements related to hose design, materials, performance under various stresses, and identification markings to assure reliability and safety in fire suppression efforts.
Audience
Contents
Structure
This section defines the scope of the standard, detailing dimensional tolerances such as internal diameter measured with plug gauges (+2.0 mm / -0.0 mm), standard hose length of 30 meters ±2%, maximum mass per meter under conditioned environment, and maximum coil diameter of 52 cm for dry hoses without couplings. It also specifies rounding rules for test values following IS 2:1960.
IS 14933 incorporates references to various Indian Standards and outlines sampling procedures based on lot sizes, including acceptance criteria for conformity. The committee composition and revision notes are also described, emphasizing the importance of verifying current standards.
Key definitions and measurement protocols are clarified, including the method of determining internal diameter, conditioning requirements for mass measurement, coil diameter specifications, and rounding off procedures for test results.
Materials used in testing, such as steel cubes and abrasive cloth, are specified along with hydrostatic pressure test conditions. Details on test apparatus like pressure sources, abrading machines, and measuring instruments are provided.
This chapter discusses hose dimensions, mass limits, length tolerances, coil diameter, and sampling requirements to ensure consistency and quality in hose manufacturing.
The maximum permissible coil diameter for 30-meter dry hoses without couplings is established at 52 cm, with measurement methods and tolerance limits for internal diameter and mass detailed.
Types of reinforcement such as fabric sheeting are described, along with the adhesion test procedure involving weight application to evaluate bonding strength between lining and reinforcement.
Guidelines for hydrostatic pressure testing include air removal, pressure increase rates, holding times, and acceptance criteria to verify hose integrity under specified pressures.
Details on burst pressure testing cover test setup, pressure application rate, minimum pressure thresholds, and specific requirements for Type B hoses to ensure safety and durability.
The abrasion resistance test involves subjecting pressurized hose samples to controlled abrasion using specified materials and machine settings, measuring the cycles to failure to assess durability.
This test exposes hose samples to controlled ozone concentrations and temperatures to check for cracking or crazing, ensuring the hose lining withstands ozone-induced degradation.
Hose specimens are immersed in specified oil at controlled temperatures for set durations, followed by visual inspection and adhesion testing to assess resistance to oil-induced damage.
Test pieces are subjected to a heated steel cube at 600 ±10°C, with time to burst recorded to evaluate the hose’s ability to resist high temperatures without failure.
Marking provisions cover manufacturer details, hose specifications, batch information, and the conditions for applying the Standard Mark under BIS regulations, ensuring traceability and compliance.
Sampling procedures based on lot size are outlined with acceptance thresholds for defects, along with specific tests like heat resistance to confirm overall product conformity.
Frequently Asked
According to the standard, the hose lining is typically made from rubber or rubberized fabric to provide flexibility, water tightness, and pressure resistance. The outer cover consists of a woven synthetic fabric jacket, which may be coated with an elastomeric layer to enhance resistance against oils, abrasion, and heat.
Hoses must withstand a hydrostatic proof pressure of 3.43 MPa (35 kgf/cm²) held for one minute without leakage or damage, with pressure applied at a rate not exceeding 1 MPa/min. For burst pressure, the hose should endure at least 5.2 MPa (50 kgf/cm²) without bursting or leakage, with the pressure similarly increased gradually.
Abrasion resistance testing involves subjecting pressurized hose samples to reciprocating abrasion using an abrasive strip made of aluminium oxide cloth (grit 50). The hose is pressurized at 0.7 MPa while the abrasive strip moves at 50–60 double strokes per minute with a specified downward force, and the number of cycles until failure is recorded to determine abrasion durability.
Ozone resistance is tested by exposing a conditioned hose sample to an ozone concentration of 50 ±5 pphm at 50 ±2°C for 96 hours, followed by inspection for cracking under magnification. Oil resistance testing involves immersing a 1-meter hose segment in Oil No. 3 at 50 ±2°C for 70 hours, then visually inspecting for swelling or cracking and conducting adhesion tests to verify material integrity.
Each hose length must be marked with clear, permanent characters indicating the hose type, internal diameter, length, manufacturer’s name or trademark, and manufacturing date (month and year). If licensed, the Standard Mark may also be applied to signify compliance with the standard.
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