Portable fire extinguishers - Performance and Construction

IS 15683: Scope & Key Specifications Summary

IS 15683 covers performance and construction requirements for portable fire extinguishers, ensuring reliability and safety.

Scope Highlights:

• Applies to all types of portable fire extinguishers.
• Specifies minimum extinguishing medium quantities for Class B fires (flammable liquids).
• Defines marking, color coding, and testing methods.
• References maintenance practices per IS 2190:1992.

Key Table: Minimum Extinguishing Medium for Class B Rating (Table 5)

Color Coding for Extinguishers (Clause 10.1)

Note: Markings must be hard stamped or engraved on the extinguisher body.

Additional Notes:

• Clean agents commonly include HFC and HCFC.
• Rounding off numerical test results per IS 2:1960.
• External corrosion test apparatus detailed (Fig. 7).

This standard guides manufacturers and users for safe, effective portable fire extinguishers compliant with Indian regulations.

IS 15683 Key References: Extinguishing Medium & Ratings

1. Extinguishing Medium Content & Minimum Ratings

Note: Clean agents typically include HFC and HCFC.

2. Minimum Class A Rating (Table 4)

3. Class D Fire Extinguishers (Clause 8.1.4)

• Specialized media and applicators required.
• Not suitable for other fire classes.
• Must pass test fires as per Clause 8.5.

4. General Notes

• All dimensions in millimeters.
• Extinguishers must meet minimum rating by charge content.
• Refer to Clause 9.8.1 and 9.2.1 for general requirements.

flowchart TD
    A[Extinguishing Medium] -->

IS 15683: Key Definitions & Specifications

• Extinguishing Medium Content (Charge): Amount of agent in extinguisher (kg), e.g., Powder, CO₂, Foam/Water Additives, Clean Agent (HFC/HCFC).

• Minimum Class B Rating: Indicates fire suppression effectiveness, e.g., 8B, 13B, 21B, 34B depending on charge.

Table: Extinguishing Medium vs Minimum Class B Rating (Clause 8.1.2)

Wood-Crib Ignition Arrangement (Class A Fires) - Table 8 (Clause 8.3.3)

Notes:

• Test Fire Trays: Cylindrical welded steel trays with vertical sides; base level with ground. Larger trays require base reinforcement.

• Clean Agents: HFC and HCFC are internationally approved for Class B fire extinguishing.

IS 15683: Classification and Ratings - Key Formulas & Tables

1. Rating Suitability for Fire Classes (Clause 8.1)

• Extinguisher rating is based on the minimum extinguishing medium quantity required to put out the test fire.
• Class A ratings use wood cribs (Clause 8.3) and Class B ratings depend on the amount of powder, CO₂, foam, or clean agent.

2. Minimum Extinguishing Medium for Class B (Table 5, Clause 8.1.2)

Note: Approved clean agents include HFC and HCFC.

3. Class A Test Fire Crib Construction (Clause 8.3.2, Tables 6 & 7)

• Air Inlet Opening Surface Area (m²):

• Wood Crib Dimensions & Arrangement:

IS 15683: Filling Requirements Summary

1. Fill Density (Clause 3.11)

• Mass (kg) of extinguishing medium per litre of container volume (including valve & fittings).

2. Filling Tolerance (Clause 5.3.2)

3. Minimum Class B Rating & Extinguishing Medium Content (Table 5, Clause 8.1.2)

Note: Approved clean agents include HFC and HCFC.

flowchart TD
    A[Filling Requirements] --> B[Fill Density (kg/L)]
    A --> C[Filling Tolerance]
    C --> D[Water-Foam ±9% vol]
    C --> E[Powder: ≤1kg ±5%, >1<3kg ±3%, ≥3kg ±2%]
    C --> F[Clean Agent ±3

IS 15683: General Performance Requirements Summary

Key Clauses Overview:

• Clause 9.8.1 & 9.2.1 (General Requirements):

  • Ensure structural components meet minimum strength, durability, and safety margins.
  • Materials must comply with specified standards for quality and performance.
  • Design should consider service conditions, loadings, and environmental factors.

• Clause 5.3 (Filling Requirements - Type Test):

  • Specifies filling materials' properties for type testing.
  • Filling must ensure proper insulation, protection, and mechanical stability.

• Clause 7.3.1 (Requirements):

  • Details specific performance criteria such as load capacity, deformation limits, and safety factors.

Important Formulas & Specifications:

Notes:

• Always refer to material-specific tables in IS 15683 for exact values.
• Performance tests include load tests, durability tests, and environmental resistance.
• Design must consider service life and maintenance.

flowchart TD
    A[General Requirements] --> B[Material Quality]
    A --> C[Load Capacity]
    A --> D[Safety Factors]
    A --> E[Deformation Limits]
    A --> F[Filling Requirements]
    F --> G[Type Testing]
    G --> H[Mechanical Stability]

For detailed tables and exact values, consult the full IS 15683 document sections mentioned.

IS 15683: Test Apparatus and Methods - Key Points

Clause 7.7.2: Test Apparatus

• Specifies apparatus for testing load-bearing capacity, deflection, and durability of precast concrete products.
• Apparatus must simulate real load conditions.
• Includes loading frames, proving rings, and deflection gauges.

Clause 7.2.3.2: Test Method

• Describes procedure for conducting tests:
  • Apply load gradually until failure or specified deflection.
  • Measure load, deflection, and crack width.
• Use calibrated instruments with accuracy ±1%.

Clause 9.7: Manufacturing Tests

• Includes compressive strength tests on concrete cubes (150mm size).
• Frequency: one test per batch or every 50 m³.
• Acceptance criteria as per IS 456.

Clause 5.3: Filling Requirements (Type Test)

• Specifies filling of hollow sections with non-shrink grout or concrete.
• Ensures uniform compaction and void-free filling.
• Test to confirm filling density and strength.

Typical Formula for Load-Deflection Test

[ \delta = \frac{PL^3}{48EI} ]

• ( \delta ) = deflection
• ( P ) = applied load
• ( L ) = span length
• ( E ) = modulus of elasticity
• ( I ) = moment of inertia

Summary Table: Tests & Frequency

flowchart TD
    A[Test Specimen] --> B[Load Application]
    B --> C[Measure Deflection]
    B --> D[Observe Cracks]
    C --> E[Compare with Limits]
    D --> E
    E --> F{Pass/Fail}

For detailed apparatus specs and calibration

IS 15683: Fire Tests and Extinguishment Procedures

Key Requirements (Clause 8.2.2)

• Class A Fires:

  • Extinguished if no flames visible 10 min after extinguisher discharge.
  • Non-persistent flames (<50 mm height & <1 min duration) ignored.
  • If crib collapses, test is void.

• Class B Fires:

  • Extinguished when all flames are out.

Test Procedure (Clause 8.5.2.3)

• Prepare fuel bed in metal/wood frame; level surface.
• Ignite center with torch for 25-30 s; remove torch.
• Wait until 25% fuel burning or 50% surface coverage.
• Extinguish fire as per manufacturer's instructions (continuous/intermittent).
• Ensure no fuel scattering off base plate during attack.
• Post-discharge, leave fire undisturbed for 60 min (or manufacturer’s recommended time).
• Confirm fire is fully out and >10% original metal fuel remains.

Class B Test Fire Dimensions (Clause 8.4.4.6 & Table 9)

• Fuel mix: 1/3 water + 2/3 heptane.
• Diameter measured at rim.

Notes

• Extinguisher discharge may be continuous or intermittent.
• Operator must not reach over or into the tray

IS 15683: Construction Requirements Key Points

1. Wood-Crib Ignition Arrangement (Class A Test Fires) - Table 8

2. Wood Crib Construction - Table 7

• Wood: Pinus Sylvestris or equivalent
• Cross-section: 39 ± 1 mm square
• Moisture content: 10–14% (dry basis)

3. Air Inlet Sizes for Ventilation - Table 6

4. Class B Test Fires (Clause 8.4.2 & Table 9)

• Use welded-sheet

IS 15683: Marking and Colour Specifications for Fire Extinguishers

Key Marking Requirements (Clause 10.2 & 10.2.1.4)

• Marking Layout: Refer to Fig. 5 for example layout including:

  • Extinguisher type & capacity (e.g., "2 KG CARBON-DIOXIDE FIRE EXTINGUISHER")
  • Instructions for use, maintenance, recharge, and record keeping
  • Temperature usability range (e.g., "-30℃ to 55℃")
  • Class rating (e.g., "CLASSIFICATION 21-B")
  • Pressure test details (e.g., "PRESSURE TESTED TO 20 MPa")

• Temperature Range: Must clearly state operational temperature limits (e.g., "Acceptable to use at temperature from ... to ...").

Colour Coding (General practice per IS standards)

• Body Colour: Typically red for fire extinguishers.
• Band Colour: Indicates extinguishing medium type (e.g., blue for CO2, cream for foam, etc.).

Dimensions & Marking Size (Clause 9.12.1.5)

• Service pressure marking width: 0.6 mm ≤ width ≤ 1.0 mm at 27℃.

Extinguishing Medium & Minimum Class B Rating (Table from Clause 28.3)

Summary Diagram: Marking Layout Example (Fig. 5)

graph TD
  A[Extinguisher Type & Capacity] --> B[Instructions for Use]
  B --> C[Maintenance & Recharge Info]
  C --> D[Temperature Range]
  D --> E[Class Rating & Pressure Test]
  E --> F[Record Keeping Tag]

IS 15683: Safety and Durability Tests - Key Points

1. Mechanical Resistance (Type Test) - Clause 7.5

• Components undergo mechanical load tests to verify resistance.
• Load application simulates real-life stresses.
• Acceptance criteria: No permanent deformation or failure.

2. Safety-Locking Devices (Batch Test) - Clause 9.11

• Each batch must be tested for locking device functionality.
• Tests ensure reliable engagement and disengagement under specified loads.

3. Material & Manufacturing Data - Clause 9.8.1.3

• Manufacturer must provide:
  • Material specifications (chemical, mechanical properties).
  • Manufacturing process details.
• Ensures traceability and quality control.

4. Accelerated Ageing Test - Clause 9.8.2.2.1

• Test conditions:
  • Oven at 100°C for 180 days.
  • Components fitted with adapters to simulate normal stresses.
• Purpose: Assess durability against thermal ageing.

Typical Formula for Stress in Mechanical Resistance Test:

[ \sigma = \frac{F}{A} ]

• ( \sigma ) = Stress (MPa)
• ( F ) = Applied Load (N)
• ( A ) = Cross-sectional Area (mm²)

Summary Table

flowchart TD
    A[Start: Component Sample] --> B{Mechanical Resistance Test}
    B -->|Pass| C[Safety Locking Device Test]
    B -->|Fail| D[Reject Component]
    C -->|Pass| E[Accelerated Ageing Test]
    C -->|Fail| D
    E -->|Pass| F[Component Approved]
    E -->|Fail| D

This sequence ensures components meet IS 15683 durability and safety standards.

IS 15683: Special Requirements for Specific Extinguisher Types

Key Specifications & Tables

1. Extinguisher Classification (Clause 4)

• Types:
  • Water/Foam based (pure or with additives)
  • Carbon Dioxide (CO2)
  • Powders (BC, ABC, or Class D specific)
  • Clean Agents (HFC, HCFC, Fluoro ketone)

2. Extinguishing Medium Content & Minimum Ratings

(Table 5: Clause 8.1.2)

(Table 4: Clause 8.1.1)

3. Class D Extinguishers (Clause 8.1.4)

• Must extinguish specific metal fires as per test in

IS 15683: Operating Instructions & Extinguishing Medium Specifications

Operating Instructions (Clause 10.2.2 Series)

• Definition (10.2.2.1): Instructions must enable proper discharge of extinguishing media, including warnings.
• Arrangement (10.2.2.4): Instructions should follow a clear, logical layout (see Fig. 6 in the code for example).
• Typical sections include:
  • Identification of extinguisher type
  • Operating steps
  • Safety warnings
  • Maintenance tips

Key Table: Amount of Extinguishing Medium for Minimum Class B Rating (Clause 8.1.2, Table 5)

• Note: Approved clean agents include HFC and HCFC.

Summary:

• Follow Clause 10.2.2 for clear, safety-focused operating instructions.
• Use Table 5 to select correct extinguishing medium quantity for required Class B fire rating.
• Ensure instructions include warnings and maintenance advice.

flowchart TD
    A[Extinguisher Type] --> B[Operating Steps]
    B --> C[Safety Warnings]
    C --> D[Maintenance Tips]
    D --> E[Proper Discharge of Media]

This flow ensures user clarity and safety compliance per IS 15683.

IS 15683: Mounting and Handling Key Points

Clause 9.3: Carrying Handle

• Extinguishers must have a carrying handle for ease of transport.
• Handle design should ensure safe, ergonomic handling.

Clause 9.11.3: Safety Locking Devices

• Safety-locking pin or device must be visible from the front when mounted.
• Exception: Pin can be on the reverse if front has clear pictographic instructions.

Clause 9.10: Operating Force (Table 10)

• For CO₂ extinguishers, max force may increase to 300 N.

Mounting Guidelines Summary:

• Mounting brackets must allow easy visibility and access.
• Extinguisher should be securely held but easily removable.
• Safety pins visible or clearly instructed.
• Handles designed for ergonomic carrying.

Diagram: Safety Locking Visibility

flowchart LR
    A[Mounted Extinguisher Front] -->|Visible Pin| B[Safety Locking Pin]
    A -->|Pictographic Instructions| C[Pin on Reverse Side]

This ensures safe, quick operation and handling compliance per IS 15683.

IS 15683 Annexes & Additional Information Key Points

1. Extinguishing Medium Content & Minimum Class B Rating (Table 5)

• Note: Clean agents include internationally approved HFC and HCFC.

2. Colour Coding for Extinguishers (Clause 10.1)

• Colour band covers 5% of surface area for easy identification.

3. Hose Assembly (Clause 9.9.1)

• Extinguishers with >3 kg or >3 L extinguishing medium must have a discharge hose.
• Flexible hose length ≥ 400 mm.

4. Testing & Marking

• Hard stamping or engraving for marks on metal body (Clause 10.2.1.1).
• External corrosion test apparatus example: Plastic tub with salt water (Fig. 7).

Summary Diagram: Extinguisher Classification & Colour Coding

graph TD
    A[Extinguisher Type] --> B[Water - Red]
    A --> C[Powder - Blue]
    A --> D[Foam - Yellow]
    A --> E[CO₂ - Black]
    A --> F[Clean Agent - Green]

For detailed design, performance, and maintenance, refer to IS 15683 and