Specification for the controlled percolating hose for firefighting 1994 Edition
IS 8423:1994 outlines the standards for controlled percolating hoses designed for firefighting applications. These hoses permit limited water seepage to avoid heat damage when used over hot surfaces. The standard details specifications for dimensions, materials, performance evaluations including percolation thresholds, pressure endurance, flammability, and durability to guarantee dependable firefighting equipment.
IS 8423:1994 outlines the standards for controlled percolating hoses designed for firefighting applications. These hoses permit limited water seepage to avoid heat damage when used over hot surfaces. The standard details specifications for dimensions, materials, performance evaluations including percolation thresholds, pressure endurance, flammability, and durability to guarantee dependable firefighting equipment.
Audience
Who Uses This Standard
Firefighting system engineers
Manufacturers of fire safety hoses
Quality assurance inspectors in fire equipment
Procurement specialists for fire brigades
Safety managers in industrial settings
Designers of fire protection solutions
Testers specializing in textile and rubber hoses
Contents
Key Topics Covered
✓Standard hose diameters and lengths
✓Permissible percolation volume ranges
✓Hydrostatic pressure and bursting strength tests
✓Fire resistance and flammability criteria
✓Uniformity in water seepage and wetting evaluation
✓Dimensional stability under pressure
✓Sampling plans and compliance benchmarks
✓Marking and packaging protocols
✓Specifications for coil diameter
✓Use of preservatives and rot resistance
✓Tests for resistance to kinking
✓Manufacturing quality assurance techniques
Structure
Table of Contents
1Scope and Overview of Controlled Percolating Firefighting Hose
2Referenced Standards and Normative Documents
3Terminology and Definitions Pertinent to Controlled Percolation Hoses
4Dimensional Requirements and Tolerance Limits
5Length Specifications and Sampling Methods for Hoses
6Coil Diameter Standards for Machine-Coiled Hoses
7Mass per Unit Length Requirements and Conditioning
8Percolation Volume Specifications and Testing
9Evaluation of Evenness of Wetting on Hose Surface
10Hydrostatic Proof Pressure Testing Procedures
11Bursting Pressure and Kink Resistance Tests
12Flammability Standards and Test Methods
13Resistance to Kinking Under Pressure
14Permissible Changes in Hose Dimensions After Testing
15Sampling Plans and Acceptance Criteria for Lot Compliance
16Marking, Packaging, and Licensing Regulations
Frequently Asked
Popular Questions About IS 8423
?What are the permitted percolation volumes for various hose diameters?▼
As per IS 8423 Clause 8.1 and Table 2, controlled percolating firefighting hoses have specific minimum and maximum allowed water seepage volumes depending on nominal diameter:
Diameter (mm)
Minimum Percolation (litres)
Maximum Percolation (litres)
38
0.40
4.0
50
0.60
5.0
63
0.80
5.0
70
1.20
6.0
These limits ensure the hose provides sufficient water leakage to prevent burning while controlling excessive water loss.
?What hydrostatic pressures should the hose endure during testing?▼
According to IS 8423, hoses are subjected to several hydrostatic pressure tests:
Proof pressure is raised to 2.1 MPa (21 kgf/cm²) at a rate of 1 MPa/min and held for 30 seconds to 1 minute without leakage or yarn failure.
Initial air bleeding is done at 0.07 MPa (0.7 kgf/cm²) to remove trapped air.
Wetting and bursting tests involve pressures up to 0.7 MPa (7 kgf/cm²) and 1.8 MPa (18 kgf/cm²) respectively.
These tests confirm the hose's capacity to withstand operational pressures safely.
?How is the uniformity of wetting on the hose surface evaluated?▼
The evenness of wetting is assessed by connecting a dry hose segment to a water source and increasing pressure steadily to 7 kgf/cm² over 2 minutes. The pressure is maintained for 5 minutes, after which a visual inspection is conducted along the hose length. At least 75% of the jacket surface must be uniformly wetted to pass, ensuring consistent water permeation and absence of dry patches.
?What materials and preservatives are required to ensure hose durability?▼
IS 8423 specifies that hoses are made from cotton yarn for necessary strength and flexibility. They must be treated with Pentachlorophenyl Laurate (PCPL) as a preservative to protect against microbial decay. PCPL content is verified according to Clause 10 of IS 3522 (Part 2):1989. The treatment, combined with pressure and durability testing, guarantees long-lasting hose performance under fire service conditions.
?What are the sampling procedures and acceptance criteria for lot conformity?▼
Sampling is performed based on lot size as defined in Clause 15 and Annex A. Sample sizes increase with lot length, for example, all hoses are sampled for lots up to 15 units, 15 samples for 16–25 units, and so forth. Acceptance criteria allow zero defects for smaller lots and a maximum of one defective hose in larger lots (51–100). Dimensional changes in diameter and length must not exceed 10%. This framework ensures consistent product quality and compliance.
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