Specification for Portable Fire Extinguishers - Halon 1211 Type

IS 11108 - Scope: Key Specifications & Tables

Materials of Construction (Clause 4.1, Table 1)

Construction (Clause 6.1)

• Body shape: Cylindrical
• Filling ratio: ≤ 0.75

Discharge Performance (Clause 10.5, Table)

• Discharge test at 27 ± 5°C, horizontal direction, still air.
• Minimum 95% contents discharge within specified time

IS 11108: Materials of Construction (Clause 4.1 & Table 1)

Key Formula for Minimum Wall Thickness (Clause 7.1.1)

• For cylindrical shell:

[ t = \frac{p \times D_o}{200 \times 0.8 \times J \times R_e + p} ]

• For tori-spherical end:

[ t = \frac{p \times D_o}{200 \times 0.8 \times J \times R_e + p} ]

• For semi-ellipsoidal end:

[ t = \frac{p \times D_o}{200 \times 0.8 \times J \times R_e + p} \times \frac{K(0

IS 11108 - Key Design & Construction Specs

1. Materials of Construction (Clause 4.1, Table 1)

2. Design Specifications (Clause 6.1)

• Body shape: Cylindrical
• Maximum filling ratio: 0.75

3. Performance Requirements (Clause 10.5, Table 10)

IS 11108 Key Points on Capacity and Filling Ratio

• Water Capacity: Max 6.5 liters (Clause 2.1). Extinguishers covered: 1.25, 2.5, 4, 5, and 6.5 kg.

• Filling Ratio: Shall not exceed 0.75 (Clause 6.1).
  Filling Ratio = (Mass of extinguishing agent) / (Volume of container × Density)

• Charging Pressure:

  • For 2.5 kg: 10.5 ± 0.5 kgf/cm² with +50% tolerance (Clause 2.5b)
  • For 4 kg: Specified in Clause 2.5c (details similar to 2.5 kg)

• Discharge Test Requirements (Clause 10.5):

• Discharge Condition: Horizontal direction, still air, at 27 ± 5°C.

Summary Formula for Filling Ratio

[ \text{Filling Ratio} = \frac{\text{Mass of extinguishing agent}}{\text{Volume of container} \times \text{Density of agent}} \leq 0.75 ]

This ensures safe and effective filling without over-pressurizing the extinguisher.

flowchart TD
    A[Extinguisher Capacity] --> B[Filling Ratio ≤ 0.75]
    B --> C[Charging Pressure]
    C --> D[Discharge Test]
    D --> E[Minimum Jet Time & Range]

This encapsulates the key design and test parameters per IS 11108.

Pressurization and Charging - IS 11108 Key Points

1. Body Shape & Filling Ratio (Clause 6.1)

• Shape: Cylindrical
• Filling Ratio: ≤ 0.75 (i.e., max 75% of volume filled with extinguishing agent)

2. Charging Pressure (Clause 1.25)

• Charge Weight: 1.25 kg ± 50 g (for specified agent)
• Charging Pressure: 9.5 kgf/cm² ± 0.5 kgf/cm² (approx. 0.93 MPa ± 0.05 MPa)

3. Pressure Gauge (Clause 7.6)

• Must be fitted (except universal types)
• Should indicate:
  • Normal charging pressure
  • Partial/full discharge status

4. Materials for Components (Clause 4.1, Table 1)

Formula for Charging Pressure Check

[ P_{charge} = 9.5 \pm 0.5 , \text{kgf/cm}^2 ]

Summary Diagram: Pressurization & Charging Flow

flowchart TD
    A[Extinguisher Body (Cylindrical)] --> B[Filling with Agent (≤ 

IS 11108: Performance Requirements Summary

Key Specifications:

• Body Shape: Cylindrical (Clause 6.1)
• Filling Ratio: ≤ 0.75 (Clause 6.1)
• Test Temperature: 27 ± 5°C (Clause 10.5)
• Discharge: Continuous, horizontal stream in still air (Clause 10.5)
• Discharge Mass: ≥ 95% of liquid content (full mass difference) (Clause 10.5)

Performance Test (Clause 10.5):

Notes:

• The extinguisher must maintain the throw for the minimum period.
• Discharge must be completed within the maximum time.
• The jet range is the minimum horizontal distance the stream should reach.

flowchart LR
    A[Full Charged Extinguisher] --> B[Discharge Test at 27±5°C]
    B --> C{Discharge ≥ 95% of content?}
    C -- Yes --> D[Throw duration ≥ Min. Period]
    C -- No --> E[Fail Test]
    D --> F[Discharge completed ≤ Max. Time]
    F --> G[Jet Range ≥ Min. Distance]
    G --> H[Pass Performance Test]

This ensures reliable and effective extinguisher performance as per IS 11108.

IS 11108: Testing Procedures Key Points

Sampling (Clause 1.2.1 & A-1.2.1)

• Samples are randomly taken from a lot as per criteria in A-1.2.2.
• One sample tested for drop test (Clause 10.3) and performance test (Clause 10.5).

Material (Clause 4.1)

• Materials for extinguisher components specified in Table 1 (refer IS 11108 for details).

Performance Test (Clause 10.5)

• Extinguisher filled to marked full mass.
• Discharge at 27 ± 5°C in normal working position.
• At least 95% liquid content must be expelled continuously.
• Jet discharged horizontally in still air.

Summary Formula for Discharge Test:

• Discharge Time ≤ Max. Discharge Time for 95% content
• Jet Range ≥ Specified minimum

flowchart LR
    A[Sample Selection] --> B[Drop Test (Clause 10.3)]
    A --> C[Performance Test (Clause 10.5)]
    C --> D{Check Discharge}
    D -->|≥95% expelled| E[Pass]
    D -->|<95% expelled| F[Fail]

This ensures extinguisher reliability and compliance with IS 11108.

IS 11108: Key Marking & Labeling Specifications

1. Fire Class Marking (Clause 9.3)

• Letters: B and C (fire classes)
• Letter size: 2.5 cm height, black color
• Enclosure:
  • B: inside a green square (4 cm size)
  • C: inside a green circle (2 cm radius)
• Green color: Shade No. 284 as per IS 5-1978
• Paint: Conforming to IS 2932-1974 (electroplated coating thickness test methods)

2. Mandatory Markings on Extinguishers (Clause 11.1)

• Manufacturer’s name & trademark
• Method of operation (prominent)
• Words: "Halon 1211"
• Capacity & charged pressure; radiographed status
• Warning: "Send for re-charging immediately after use"
• Year of manufacture
• Test pressure & capacity (kg)
• Tare weight and full weight (gas + liquid)
• Warning: "WARNING: Ventilate the area after use"

3. BIS Certification Mark (Clause 11.2)

• Optional Standard Mark usage governed by BIS Act 1986
• License conditions available from BIS

graph TD
A[Extinguisher] --> B[Marking]
B --> C[Fire Class Letters (B & C)]
B --> D[Manufacturer Info]
B --> E[Operational Instructions]
B --> F[Capacity & Pressure]
B --> G[Warnings]

This ensures clear identification, safe use, and regulatory compliance.

IS 11108: Safety Features - Key Specifications & Tables

1. Body Shape & Filling Ratio (Clause 6.1)

• Shape: Cylindrical
• Filling Ratio: ≤ 0.75 (to ensure safe vapor space)

2. Materials of Construction (Clause 4.1, Table 1)

3. Discharge Performance (Clause 10.5, Table 10)

IS 11108: Sampling and Conformity Criteria

Sampling Plan (Clause 1.2.2, Appendix A)

• Samples must be selected randomly from the lot.

Key Points (Appendix A-0.1)

• Fire extinguishers require high reliability due to critical safety function.
• Quality control involves:
  • Design adequacy
  • Raw materials and components control
  • Process control during manufacture and assembly

Conformity Criteria

• The lot is accepted or rejected based on test results of the sampled items.
• The risk of failure is minimized by strict adherence to sampling sizes and quality control.

Summary:
Use the above sampling sizes for testing fire extinguisher lots. Ensure random sampling and rigorous quality control to guarantee reliability.

flowchart TD
    A[Lot of Fire Extinguishers] --> B{Lot Size?}
    B -->|Up to 25| C[Take 3 Samples]
    B -->|26 to 50| D[Take 5 Samples]
    B -->|51 to 100| E[Take 8 Samples]
    B -->|101 to 200| F[Take 8% Samples]
    C --> G[Test Samples]
    D --> G
    E --> G
    F --> G
    G --> H{Conformity?}
    H -->|Yes| I[Accept Lot]
    H -->|No| J[Reject Lot]

This ensures reliability and safety compliance per IS 11108.

IS 11108 - Certification and Standard Mark Key Points

1. BIS Certification Marking (Clause 11.2)

• The product may be marked with the BIS Standard Mark.
• Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Licence conditions for using the Standard Mark are available from BIS.

2. Sampling and Conformity Criteria (Clause 12 & 1.2.7)

• In absence of manufacturer's test certificate, sample fire extinguisher components are individually tested for compliance.
• Charge quality must meet the specification requirements.

3. Materials of Construction (Table 1, Clause 4.1)

Summary Diagram: Certification Process Flow

flowchart TD
    A[Manufacturer] --> B[Apply for BIS Licence]
    B --> C[BIS Review & Testing]
    C --> D{Compliance?}
    D -- Yes --> E[Grant Licence & Standard Mark Use]
    D -- No --> F[Reject Application]
    E --> G[Mark Product with

IS 11108 Annexures & References – Key Specifications and Tables

Table 1: Materials of Construction (Clause 4.1)

Important Amendments & Notes:

• Steel body material updated to IS: 513-1986.
• Neck ring steel standards include IS: 6240-1976 and IS: 9550-1980.
• Spring steel standard updated to IS: 454 (Part 1)-1981.
• Siphon tube brass standard updated to IS: 1545-1982.
• Mechanical failure test added to clause 10.1.
• Finish requirements for extinguisher body clarified (Clause 9.1).

References for Material Standards:

• IS: 513 – Cold-rolled low carbon steel sheets.
• IS: 6240 – Hot-rolled steel plates for low-pressure gas cylinders.
• IS: 318 – Leaded tin bronze ingots and casting.
• IS: