Specification for a dry powder fire extinguisher for metal fires

IS 11833: Scope - Key Specifications and Tables

Scope Summary:

IS 11833 covers dry powder fire extinguishers for metal fires, specifying materials, construction, dimensions, and environmental considerations.

Key Tables & Specifications

1. Materials of Construction (Table 1)

2. Shape and Dimensions (Clause 5.1)

• Note: Minimum shell thickness ≥ d/100 (d = diameter in mm).

3. Environmental Considerations (Annex A, B, C)

IS 11833: Key Formulas, Tables & Specifications for Capacity

1. Capacity of Dry Powder Content (Clause 2.1)

2. Body Shape & Dimensions (Clause 5.1)

• Shape: Cylindrical body
• Outside Diameter & Thickness:

• Note: Minimum thickness ≥ d/100 (d = diameter in mm) based on bursting formula.

3. Discharge Requirements (Clause 12.1)

• Minimum discharge: 85% by mass of rated capacity at 27 ± 2℃.
• Discharge duration:

4. Additional Specification (Clause 5.6)

• Drain plug opening ≥ 25 mm diameter (except for 10 & 25 kg capacities).

flowchart TD
    A[Nominal Capacity] --> B[Dry Powder Content]
    B --> C[Body Dimensions]
    C --> D[Thickness ≥ d/100]
    D --> E[Discharge Capacity]
    E --> F[Minimum 85% mass discharge]
    F --> G[Discharge Duration per Capacity]

This summary ensures compliance with

IS 11833: Key Materials & Specifications for Fire Extinguisher Construction

Table 1: Materials for Various Components

Shell Thickness & Dimensions (Clause 5.1)

• Note: Minimum thickness ≥ d/100

IS 11833: Key Construction Specifications for Fire Extinguishers

1. Materials of Construction (Table 1)

2. Body Shape and Dimensions (Clause 5.1)

• Shape: Cylindrical
• Dimensions:

• Note: Minimum thickness ≥ d/100 (d = diameter in mm).

3. Additional Construction Notes

• Hose rest must have necessary

IS 11833: Components and Fittings - Key Specifications

1. Materials for Components (Table 1, Clause 4.1.2)

2. Dimensions for Body (Clause 5.1)

Note: Minimum thickness ≥ d/100, where d = diameter in mm.

3

Applicator Requirements (IS 11833)

• Applicator Design (Clause 8.1):

  • Fitted at hose discharge end via coupling.
  • Extended pipe length: ≥ 1 m.
  • Ends with a dome bell.
  • Equipped with deflecting vanes to sprinkle powder as a low-pressure discharge.
  • Ensures powder spreads uniformly on burning reactive metal.

• Performance (Clause 12.1):

  • At 27 ± 2℃, still air, extinguisher with applicator must discharge ≥ 85% by mass of rated capacity.
  • Discharge duration based on capacity:

• Body Dimensions (Clause 5.1):

• Thickness Note: Minimum thickness ≥ d/100 (d = diameter in mm), considering bursting pressure.

flowchart LR
    Hose -->|Coupling| Applicator
    Applicator -->|Extended pipe ≥1m| DomeBell
    DomeBell -->|Deflecting vanes| PowderSprinkle
    PowderSprinkle --> FireSurface

This ensures efficient, controlled powder discharge to suppress reactive metal fires per IS 11833.

IS 11833: Anti-Corrosive Treatment (Clause 9)

Key Specifications:

• Internal surfaces of the extinguisher body and parts must be coated with:
  • Zinc or
  • Lead-tin alloy (tin ≥ 10%)
• Coating methods: Hot dipping, electrodeposition, or phosphating.
• Minimum coating thickness: 0.025 mm.
• Thickness measurement: As per IS: 3203-1982.

Summary Table for Anti-Corrosive Coating

Additional Notes

• Proper anti-corrosive treatment ensures durability and performance of the extinguisher.
• Zinc coating protects steel by sacrificial action.
• Lead-tin alloy provides corrosion resistance and good adherence.
• Phosphating improves paint adhesion if additional coatings are applied.

flowchart LR
    A[Internal Surface] --> B[Coating Application]
    B --> C{Coating Type}
    C -->|Zinc| D[Hot Dipping / Electrodeposition]
    C -->|Lead-Tin Alloy| E[Hot Dipping / Electrodeposition]
    C -->|Phosphating| F[Surface Treatment]
    D & E & F --> G[Minimum Thickness 0.025 mm]
    G --> H[Measurement per IS:3203-1982]

This treatment ensures the extinguisher's internal metal parts resist corrosion, extending service life and safety.

IS 11833: Performance Requirements & Tests Summary

1. Discharge Requirement (Clause 12.1)

• Extinguisher must discharge ≥ 85% by mass of rated capacity at 27 ± 2℃, still air.

2. Discharge Duration (Clause 12.1)

3. Atmospheric Life of Gas-Based Agents (Annex B, Clause 13.2.2)

4. Global Warming Potential (GWP) (Annex C, Clause 13.2.3)

5. Ozone Depleting Potential (ODP) (Annex A, Clause 13.2.1)

Key Notes:

• Extinguishers must ensure steady, low-pressure discharge.
• Environmental impacts (OD

IS 11833: Marking and Labeling of Dry Powder Fire Extinguishers for Metal Fires

Clause 13.1: Mandatory Markings on Each Extinguisher

• Manufacturer's name or trademark
• Method of operation (prominently displayed)
• Text: "DRY POWDER EXTINGUISHER FOR METAL FIRE"
• Capacity in kg
• Text: "RECHARGE AFTER USE"
• Pressure test declaration: Body tested to 3.0 MN/m² (30 kgf/cm²)
• Letter "D" indicating suitability for Class D fires
• Year of manufacture
• Working and design pressure

Clause 13.1.1: Optional Marking

• May include the BIS Standard Mark indicating compliance with IS standards and quality control.

Summary Table of Marking Requirements

Additional Notes

• Markings must be clear, permanent, and legible.
• The Standard Mark use is regulated by BIS under the Bureau of Indian Standards Act 1986.
• Markings ensure traceability, safety, and compliance.

flowchart TD
    A[Extinguisher Body] --> B[Marking Plate]
    B --> C{Markings}
    C -->|Manufacturer| D[Name/Trademark]
    C -->|Operation| E[Method of Operation]
    C -->|Fire Type| F["DRY POWDER EXTINGUISHER FOR METAL FIRE"]
    C -->|Capacity| G[Capacity in kg]
    C -->|Recharge| H["RECHARGE AFTER USE"]
    C -->|Pressure

IS 11833: Environmental & Safety Requirements Summary

1. Ozone Depleting Substances (ODS) - Annex A (Clause 13.2.1)

High ODP values indicate severe ozone layer impact.

2. Atmospheric Life Time of Gas-Based Agents - Annex B (Clause 13.2.2)

3. Global Warming Potential (GWP) - Annex C (Clause 13.2.3)

4. Discharge Duration Requirements (Clause 12.1)

IS 11833 - Packaging: Key Formulas, Tables, and Specifications

1. Shape & Dimensions (Clause 5.1, Table 5)

• Note: Minimum thickness ≥ d/100, where d = diameter in mm (accounts for bursting pressure).

2. Material Specifications (Clause 4.1.2, Table 1)

3. Additional Packaging Requirements

• **Clause

IS 11833: Optional ECO Mark Requirements Summary

• ECO Mark Purpose:
  Introduced by the Ministry of Environment and Forests (MEF), the ECO Mark certifies environment-friendly products administered by BIS under the BIS Act, 1986.

• Eligibility:

  • Product must have the BIS Standard Mark (ISI Mark).
  • Must meet additional optional environmental criteria specified in the relevant standards.
  • ECO Mark is a combined logo: ISI Mark + ECO logo.

• Clause Highlights:

  • 13.1.1: Any fire extinguisher with BIS Standard Mark qualifies for ECO Mark consideration.
  • 13.1.3: Products may briefly display criteria for ECO Mark award.

• Key Notes:

  • ECO Mark requirements are optional; manufacturers can opt for ISI Mark alone.
  • Specific environmental criteria are included via amendments in relevant standards.

No explicit formulas or tables are given in IS 11833 for ECO Mark; compliance depends on additional environmental parameters defined per product type.

flowchart LR
  A[Product] --> B{Has BIS ISI Mark?}
  B -- No --> C[No ECO Mark]
  B -- Yes --> D{Meets ECO criteria?}
  D -- No --> E[ISI Mark only]
  D -- Yes --> F[ISI Mark + ECO Mark]

Summary: ECO Mark is an optional environmental certification combined with ISI Mark, requiring compliance with additional eco-friendly criteria per product standards.

IS 11833: Amendments & Updates Key Points

1. Amendments Overview

• Amendment No. 1 (March 2002): Added new subclauses (Clause 6).
• Amendment No. 2 (Sept 2006): Changed clause 13 title from "OPTIONAL" to "ADDITIONAL".
• Amendment No. 3 (Aug 2007): Further updates in clause 6.

2. Important Tables from Clause 13

3. Key Specifications

• ODP (Ozone Depletion Potential): Relative to CFC-11 (ODP=1.0).
• Life Time: Indicates environmental persistence (years).
• GWP: 100-year global warming potential compared to CO2.

4. Summary Table Example: ODP Values

5. Usage Note

• Use updated values from amendments to select environmentally safer extinguishing agents.
• Prioritize agents with low ODP and GWP for compliance and sustainability.

flowchart LR
    A[Fire Extinguisher Agents] --> B{Environmental Impact}
    B --> C[Ozone Depletion Potential (ODP)]
    B --> D[Global Warming Potential (GWP)]