Specification for portable fire extinguishers, dry powder (cartridge type)

IS 2171: Scope - Key Specifications & Tables

1. Scope Overview

• Covers cylindrical body shape for fire extinguisher containers.
• Specifies dimensions for extinguisher capacities.
• References multiple Indian Standards (Annex A) for materials, welding, testing, and coatings.

2. Body Dimensions (Clause 6.1)

• ID = Inside Diameter, OD = Outside Diameter

3. Referenced Indian Standards (Annex A)

• IS 2062: Steel for general structural purposes
• IS 2190: Installation and maintenance of fire extinguishers
• IS 4947: Gas cartridges for fire extinguishers
• IS 1239 (Part 1): Mild steel tubes
• IS 5382: Rubber sealing rings
• IS 6240: Hot rolled steel plates for gas cylinders
• Others covering welding, coatings, plastics, and powders.

4. Additional Notes

• Sampling and conformity criteria detailed in Annex B.
• Encouraged to use latest editions of referenced standards.

flowchart LR
    A[Fire Extinguisher Body] --> B[Cylindrical Shape]
    B --> C{Capacity}
    C -->|1 kg| D[Diameter: 75-80 mm]
    C -->|2 kg| E[Diameter: 100-110 mm]
    C -->|5 kg| F[Diameter: 150-160 mm]
    C -->|10 kg| G[Diameter: 175-185 mm]
    C --> H[Filler Opening Size]
    H -->|1 kg| I[≥ 35 mm]
    H -->|2 kg| J[≥ 45 mm]
    H -->|5 kg| K[ID 65-

IS 2171 Referenced Indian Standards Summary

• Clause 2.1 & Annex A: IS 2171 references multiple Indian Standards (IS) that form integral provisions of this code. These cover materials, welding, testing, and safety related to pressure vessels and structural steel.

Key Referenced IS Standards (Samples)

Important Notes

• Thickness calculation (Clause 7.2): Minimum shell thickness = 1.4 mm; use modified formula with factor 300 (not 360).
• Certification & Sampling: Details in Annex B, with criteria for conformity.
• Standards are subject to revision; always check for latest editions.

Typical Thickness Formula (Clause 7.2 Amendment)

[ t = \frac{P \times D}{2 \times \sigma \times E} \quad \text{with } \sigma = \text{allowable stress}, E = \text{joint efficiency} ]

Where factor 300 replaces 360 in design calculations.

Diagram: IS 2171 Referenced Standards Integration

graph LR
A[IS 2171] --> B[Material Specs (IS 2062, IS 1239)]
A --> C[Welding Codes (IS 819)]
A --> D[Testing Methods (IS 3203, IS 5762)]
A --> E[Fire Safety (IS 2190, IS 4308)]
A --> F[Certification & Sampling (Annex B)]

Summary: IS 2171 integrates multiple IS codes covering materials, welding, testing, and safety. Always verify the latest versions for compliance.

IS 2171: Materials of Construction for Fire Extinguishers

Key Materials (Table 1, Clause 5.1)

Shell Thickness Calculation (Clause 7.2)

• Minimum thickness: 1.4 mm

• Formula for Carbon Steel Body:

[ t = \frac{P \times D}{300 \times \sigma} + 0.7 \text{ mm} ]

• Where:
  • ( t ) = minimum thickness (mm)
  • ( P ) = design pressure (N/mm²)
  • ( D ) = external diameter (mm)
  • ( \sigma ) = allowable stress (N/mm²)

Note: Use 300 instead of 360 as per Amendment No. 3.

Welding Standards (Clause 7.2.1)

• Oxy-acet

IS 2171 Key Specifications for Shape and Dimensions of Fire Extinguisher Body

1. Shape

• The body shall be cylindrical (Clause 6.1).

2. Dimensions (Clause 6.1, Table 6)

3. Thickness of Shell (Clause 7.2)

• Minimum thickness = 1.4 mm.
• Thickness shall be calculated by formula (with substitution of 300 for 360 in bursting pressure formula):

[ t = \frac{P \times d}{2 \times \sigma \times \eta} ]

Where:

• ( t ) = thickness (mm)

• ( P ) = design pressure (kgf/cm²)

• ( d ) = diameter (mm)

• ( \sigma ) = allowable stress (kgf/cm²)

• ( \eta ) = joint efficiency (usually ≤ 1)

• Minimum thickness also governed by ( t \geq \frac{d}{100} ).

4. Construction

• Welded type body.
• Thickness:
  • Up to 5 kg capacity: ≥ 1.6 mm
  • 10 kg capacity: ≥ 2.0 mm (Clause 1.6, Annex B)

flowchart TD
    A[Extinguisher Capacity] --> B{Diameter & Thickness}
    B -->|1 kg| C[Diameter: 75-80 mm]
    B -->|2 kg| D[Diameter: 100-110 mm]
    B -->|5 kg| E[Diameter: 150-160 mm]
    B -->|10 kg| F[Diameter: 175-185 mm]
    C

IS 2171: Construction Requirements Summary

1. General Requirements (Clause 12.1)

• Construction must ensure mechanical strength, durability, and safety under operating conditions.
• Materials must be compatible with the extinguishing agent.
• Dimensions and tolerances should follow specified standards for interchangeability.

2. Specific Requirements (Clause 12.2)

• Design must prevent leakage and withstand internal pressure.
• Joints and welds should be leak-proof and corrosion-resistant.
• Valve and nozzle fittings must ensure reliable operation.

3. Materials (Clause 5.1, Table 1 excerpt)

4. Paint (Clause 10.4)

• Paint must conform to IS 2932 for fire extinguisher finish.
• Typically, red enamel paint for visibility and corrosion protection.

5. Testing (Clause 11)

• Hydrostatic pressure test to verify strength.
• Leak test on joints and valves.
• Functional test for valve operation.

Key Formula: Hydrostatic Test Pressure

[ P_{test} = 1.5 \times P_{working} ]

• Where ( P_{working} ) = Maximum working pressure.

flowchart TD
    A[Material Selection] --> B[Fabrication]
    B --> C[Painting (IS 2932)]
    C --> D[Assembly]
    D --> E[Testing (Hydrostatic, Leak)]
    E --> F[Final Inspection]

This ensures safe, durable, and reliable fire extinguisher construction per IS 2171.

IS 2171: Key Specifications for Chemical Charges in Dry Powder Extinguishers

1. Chemical Charge Capacity (Clause 4.1)

2. Chemical Properties (Clause 1.1, Table B-1)

3. Chemical Type and Environmental Compliance

• Use BC or ABC class dry powder conforming to IS 4308 or IS 14609.
• Chemicals must not have global warming potential (Clause 12.2.3, Annex G).

Summary:

• Match powder weight exactly to extinguisher capacity ±5%.
• Ensure powder meets physical properties for performance and safety.
• Use eco-friendly chemicals compliant with IS standards.

flowchart TD
    A[Extinguisher Capacity] --> B[Dry Powder Charge ±5%]
    B --> C[Chemical Properties Check]
    C --> D[Specific Gravity 1.25 ± 0.02]
    C --> E[Melting Point 215-225°C]
    C --> F[Ash Content 15 ± 2%]
    B --> G[Chemical Type: BC or ABC]
    G --> H[Conforms to IS 4308 or IS 14609]
    G --> I[No Global Warming Potential]

IS 2171: Anti-Corrosive Treatment Key Points

1. Coating Requirements (Clause 9.1)

• Internal surfaces: Coated with lead-tin alloy (tin ≥ 10%) by hot-dipping.
• Minimum thickness: 0.012 mm (measured as per IS 3203).
• External surfaces: Also coated (body, inner shell, siphon tube, spring if mild steel).
• No visible uncoated areas allowed internally or externally.

2. Alternative Treatment (Clause 9.1.1)

• Phosphating per IS 3618 can replace lead-tin coating on external surfaces.

3. Dry Powder Coating (Clause 8.1)

• Use dry powder of BC or ABC Class conforming to IS 4308 or IS 14609.

4. Acid Resistance Test (Clause 3.1)

• Submerge sample in 10% HCl at 27 ± 5°C for 72 hours.
• No discoloration, distortion, or deterioration allowed.

Summary Table: Anti-Corrosive Treatment

flowchart TD
    A[Internal Surface] -->|Hot-dip Lead-Tin Alloy| B(Coating ≥ 0.012 mm)
    C[External Surface] -->|Lead-Tin Alloy or Phosphating| B
    B --> D[No Visible Uncoated Areas]
    E[Dry Powder Coating] --> F[BC or ABC Class per IS 4308/14609]
    G[Acid Resistance Test] --> H[10% HCl, 72h at 27±5°C]
    H --> I[No Dis

IS 2171: Finish and Marking - Key Points

• Finish (Clause 10.4):
  Paint shall conform to IS 2932 (Specification for paint used on fire extinguishers). This ensures corrosion resistance and durability.

• Marking (Clause 13.1 & Table 12.2):
  Marking must follow BIS certification requirements. Details on sampling and conformity criteria are provided in Annex B.

• Bottom Ring (Clause 7.12):
  Mild steel bottom ring/skirting of minimum thickness 3 mm is mandatory for structural protection.

• Paint Colours:
  Refer IS 5:1994 for colours of ready mixed paints and enamels.

• Standards Referenced for Finish & Marking:

  • IS 2932: Paint specification
  • IS 5:1994: Paint colours
  • IS 4308 / IS 14609: Powder types for extinguisher filling (Class BC & ABC)

Summary Table: Finish & Marking Requirements

flowchart TD
    A[Fire Extinguisher] --> B[Surface Preparation]
    B --> C[Paint Application]
    C --> D{Paint per IS 2932?}
    D -- Yes --> E[Apply Bottom Ring (3 mm mild steel)]
    D -- No --> F[Reject]
    E --> G[Marking per BIS (Clause 13.1)]
    G --> H[Final Inspection & Sampling (Annex B)]

This ensures fire extinguishers have durable finish, correct markings, and meet BIS standards for safety and quality.

IS 2171: Performance Tests Key Points (Clause 11.1)

Performance Test Requirements for Dry Powder Fire Extinguishers:

• The extinguisher must discharge ≥ 85% by mass of rated capacity.
• Test conducted at 27 ± 5°C with nozzle at 45° above horizontal.
• Discharge must be continuous and meet throw duration and range.
• Expansion space and other parameters per Clause 7.3 must be verified on a sample.

Additional Notes:

• The test ensures operational reliability and efficiency.
• Refer Annex B for sampling and conformity criteria.
• Related standards for materials and components are listed in Annex A.

flowchart LR
    A[Start Performance Test] --> B{Check Capacity}
    B -->|1 or 2 kg| C[Min throw 8s, Max discharge 10s, Range ≥ 2m]
    B -->|5 kg| D[Min throw 15s, Max discharge 20s, Range ≥ 4m]
    B -->|10 kg| E[Min throw 23s, Max discharge 30s, Range ≥ 6m]
    C --> F[Discharge ≥ 85% mass?]
    D --> F
    E --> F
    F -->|Yes| G[Test Passed]
    F -->|No| H[Test Failed]

For detailed design and testing, always cross-check with IS 2171 full text and related standards.

IS 2171: Marking and Labeling Key Points

Clause 12.1: Mandatory Markings on Extinguishers Each extinguisher must be clearly and permanently marked with:

• Manufacturer's name or trademark
• Method of operation (prominently displayed)
• Words: "Dry Powder Extinguisher"
• Capacity of extinguisher (in kg)
• Capacity of gas cartridge

Clause 10.3: Fire Class Marking

• Letters A, B, C indicate suitability for respective fire classes (per IS 2190).
• Letter size and background dimensions:

• Letters are white, centrally contained in the square and circle.

Clause 12.2.1: Use of BIS Standard Mark

• Governed by BIS Act 1986 and related rules.
• License conditions available from BIS.

Summary Table for Marking Dimensions

flowchart LR
    A[Extinguisher] --> B[Markings]
    B --> C[Manufacturer

IS 2171: Sampling and Criteria for Conformity - Key Points

Sampling Procedure (Clause 1.2.1 & Annex C)

• Samples are taken randomly from a lot as per C-1.2.2 and C-1.2.3 (details in Annex B).
• Fire extinguishers require high reliability; hence strict sampling and testing are mandatory.
• Samples undergo accelerated aging:
  • 100 min exposure to XERON ARC U.V. at 27 ± 5°C
  • Followed by 20 min at 62 ± 5°C and 60 ± 5% RH
  • Repeat cycle 60 times (Clause 3.3)
• Post aging, samples must pass internal hydraulic pressure tests (B-3.3).

Criteria for Conformity (Annex B)

• Sampling size and acceptance criteria are based on lot size and defect limits (details in Annex B Table 1).
• Fire extinguisher samples must meet physical and performance tests to confirm conformity.

BIS Certification (Clause 12.2.1)

• Use of Standard Mark governed by BIS Act, 1986.
• Licensing conditions available from BIS.

Summary Table: Sampling & Testing Cycle

Note:

Refer Annex B for detailed sampling numbers and acceptance criteria tables.

flowchart TD
    A[Random Sampling from Lot] --> B[UV Exposure 27±5°C, 100 min]
    B --> C[Heat & Humidity 62±5°C, 60±5% RH, 20 min]
    C --> D{Repeat 60 Cycles}
    D -->|Yes| B
    D -->|No| E[Hydraulic Pressure Test]
    E --> F{Pass/Fail}
    F -->|Pass| G[Con

IS 2171 - List of Referenced Standards & Key Specifications

1. Referenced Indian Standards (Annex A Highlights)

Note: These standards cover materials, welding, testing, and components used in fire extinguisher manufacturing.

2. Materials of Construction (Annex B, Table 1)

3. Welding Specifications (Clause 7.2.1)

• Oxy-acetylene welding: As per IS 1323.
• Resistance spot welding: For fittings, as

IS 2171: Committee Composition - Key Details

Committee Composition is detailed in Annex D (Foreword) of IS 2171, covering the Fire Fighting Sectional Committee, CED 22.

Key Points:

• Chairman: Shri Om Prakash (Fire Adviser), Ministry of Home Affairs, New Delhi.
• Members: Representatives from various government departments, fire services, industries, research institutes, and private companies.
• Alternate Members: Each main member has an alternate to ensure continuity.
• Ex-officio Member: Shri Vinod Kumar, Director (Civil Engineering), Director General, BIS.
• Member Secretary: Shri Sanjeev Chaturvedi, Joint Director (Civil Engineering), BIS.

Committee Representation Includes:

• Ministry of Home Affairs, Defence, Railways, Police Departments.
• Fire Services from Delhi, West Bengal, Maharashtra, Andhra Pradesh.
• Industrial representatives from Steel Authority of India, Oil & Natural Gas Commission, and private fire safety companies.
• Research organizations like CSIR, Bhabha Atomic Research Centre.
• Standardization and quality assurance bodies.

Summary Table of Key Roles

This composition ensures multi-sectoral expertise for standard development in fire fighting equipment.

graph LR
A[Chairman] --> B[Members]
B --> C[Government Departments]
B --> D[Fire Services]
B --> E[Industry Representatives]
B --> F[Research Institutes]
B --> G[Private Companies]
A --> H[Member Secretary]
H --> I[BIS]

Note: For detailed names and affiliations, refer to Annex D of IS 2171.