IS 14951 — Fire Extinguisher - 135 Litres Capacity Mechanical Foam Type

IS 14951: Scope & Key Specifications for 135 L Mechanical Foam Fire Extinguisher

Scope:

• Specifies requirements for 135 litres capacity mechanical foam fire extinguisher.
• Suitable for fighting non-polar flammable liquid fires.
• Mounted vertically on trolley wheels.
• Expulsion of foam by pressure from compressed/liquified gas cylinder.

Key Specifications:

Sampling & Conformity:

• Refer Annex B for sampling procedures and conformity criteria.
• High reliability is emphasized due to critical safety function.

Referenced IS Codes (Annex A Highlights):

• IS 1239 (Mild steel tubes)
• IS 7285 (Fire extinguisher specification)
• IS 3618 (Phosphate treatment for corrosion protection)
• IS 319, 291 (Brass and bronze materials)

Thickness Formula:

[ \boxed{ t = \frac{D}{100} } ]

• (t) = minimum thickness of the extinguisher body sheet (mm)
• (D) = diameter of the extinguisher body (mm)

flowchart TD
    A[Fire Extinguisher Body] --> B[Material: Steel/Brass/Aluminium]
    B --> C[Shape: Cylindrical]
    C --> D[Thickness: D/100]
    A --> E[Foam Expulsion]
    E --> F[Compressed/Liquified Gas Cylinder]
    F --> G[Pressure-driven Foam Discharge]

For detailed material specs and tests, consult full IS 14951 text and referenced IS codes.

IS 14951: Key References, Materials & Specifications

1. Referenced Indian Standards (Annex A)

• IS 1079: Hot rolled carbon steel sheets & strips
• IS 318: Leaded tin bronze ingots & castings
• IS 1239 (Part 1): Mild steel tubes and fittings
• IS 4984: HDPE pipes for water supply
• IS 2878: CO2 cylinders (1 kg capacity)
• IS 7328: Plastic materials for discharge fittings
• IS 4454 (Part 1): Spring steel wires for springs
• Others include IS 538 (Rubber), IS 319 (Brass), IS 6603 (Stainless steel), IS 6912 (Brass forgings)

2. Materials for Construction (Table 1)

3. Thickness Formula for Body Sheet

[ \text{Minimum thickness} = \frac{D}{100} ]

• Where D = Diameter of the cylindrical body in mm.

4. Sampling & Conformity

• Refer to Annex B for sampling procedures ensuring reliability.

IS 14951: Terminology & Key Specifications for 135 Litre Mechanical Foam Fire Extinguisher

Terminology & Key Points:

• Capacity: Total liquid capacity = 135 litres (filled to specified level).

• Body Shape: Cylindrical.

• Minimum Sheet Thickness:
  [ t = \frac{D}{100} ] where,
  ( t ) = minimum thickness (mm)
  ( D ) = diameter of the extinguisher body (mm)

• Expulsion Method: Foam expelled by pressure from compressed or liquified gas cylinder attached to extinguisher.

• Material Specifications: Refer Table 1 (materials per IS 7285 for construction).

• Finish: Body must be free from burrs and sharp edges.

• Marking: As per Clause 12.1.2, licensing and marking follow BIS regulations.

• Sampling & Conformity: Annex B details criteria ensuring reliability.

Summary Table: Key Formula & Specification

flowchart LR
    A[135 Litre Capacity] --> B[Body: Cylindrical]
    B --> C[Thickness t = D/100 mm]
    B --> D[Material per IS 7285]
    A --> E[Foam Expelled by Gas Pressure]
    E --> F[Compressed or Liquified Gas Cylinder]

For detailed materials, marking, and testing refer to IS 14951 clauses and annexures.

IS 14951: Material Requirements Summary

Key Materials & Relevant IS Codes (Table 1, Clause 5)

Foam Concentrate & Solution (Clause 7.14)

• Foam concentrate conforming to IS 4989 (Part 2)
• Quantity:
  • ≥ 8 L for 6% concentrate

IS 14951: Construction Key Points for 135 L Mechanical Foam Fire Extinguisher

Welding:

• Spot welding (for fittings): per IS 819
• Metal arc welding: per IS 9595

Material Specifications (Table 1):

Thickness of Body Sheet:

• Minimum thickness, t = D / 100 (D = diameter in mm)

Charge:

• Foam concentrate per **IS

IS 14951: Dimensions and Capacity for 135 Litre Mechanical Foam Fire Extinguisher

1. Capacity:

• Total liquid capacity = 135 litres (filled to specified level)
• Foam concentrate quantity:
  • 8 litres for 6% concentrate
  • 4 litres for 3% concentrate
• Balance quantity is water to make up 135 litres foam solution.

2. Dimensions & Thickness:

• Body shape: Cylindrical
• Minimum sheet thickness, ( t = \frac{D}{100} )
  where ( D ) = diameter of the body in mm.

3. Materials (Table 1 Highlights):

4. Expulsion Method:

• Pressure from compressed or liquified gas (CO2 cylinder of 1 kg capacity as per IS 7285).

Summary Formula:

[ \boxed{ t = \frac{D}{100} } ]

where:

• ( t ) = minimum thickness of cylindrical body (mm)
• ( D ) = diameter of the body (mm)

flowchart TD
    A[135 Litre Capacity] --> B[Foam Concentrate: 3% or 6%]
    B --> C[Water to make 135 Litre Solution]
    A --> D[Cylindrical Body]
    D --> E[Thickness t = D/100]
    A --> F[CO2 Cylinder (1 kg) as Pressure Source]
    A --> G[Materials as per Table 1]

This ensures compliance with IS 14951 for mechanical foam extinguishers.

IS 14951: Key Specifications for Components and Parts of 135 L Mechanical Foam Fire Extinguisher

1. Materials for Construction (Table 1, Clause 5)

2. Body Thickness Formula

[ \text{Minimum thickness} = \frac{D}{100} \quad \text{(D = diameter in mm)}

IS 14951 - Anti-Corrosive Treatment Key Points

1. Corrosion Resistance Test (Clause 2.5)

• Sample: 2.5 cm piece dipped in solution.
• Solution: 20% sulphuric acid + 5% sodium hydroxide.
• Duration: 10 minutes.
• Requirement: No corrosion or damage visible.

2. Anti-Corrosive Coating Specifications (Clause 9.1)

3. Measurement Standard

• Thickness measured as per IS 3203 (Non-destructive coating thickness measurement).

Summary Diagram of Surface Treatment Options

graph LR
A[Body Surface] --> B[Internal Surface]
A --> C[External Surface]

B --> D[Lead-tin alloy ≥0.012mm]
B --> E[Epoxy powder coating ≥0.050mm]
B --> F[Plastic/rubber lining ≥0.5mm]

C --> G[Lead-tin alloy ≥0.012mm]
C --> H[Phosphating (IS 3618)]
C --> I[Epoxy powder coating ≥0.050mm]

Note: All coatings must be continuous with no visible uncoated areas to ensure effective corrosion protection.

IS 14951 - Key Marking and Labeling Specifications

• Marking for Class Suitability (Clause 10.3):

  • Letters A and B indicating suitability for fire classes A & B.
  • Letter size: 2.5 cm, printed in black.
  • Letters centrally contained in a 4 cm square.
  • Square background: cream (lemon yellow), IS 5 shade No. 355.

• Standard Mark (Clause 12.1.1):

  • Extinguisher may bear the BIS Standard Mark as per Bureau of Indian Standards Act, 1986.

• Pressure Testing Declaration (Clause 3.0 f):

  • Marking must include a declaration that the extinguisher body is tested to 3.0 MN/m² (30 kgf/cm²).

• Year of Manufacture (Clause 3.0 g):

  • The year of manufacture must be clearly marked.

Summary Table for Marking Dimensions

flowchart LR
    A[Extinguisher Body] --> B[Mark Letters A & B]
    B --> C[2.5 cm black letters]
    B --> D[Contained in 4x4 cm cream square]
    A --> E[Standard Mark (optional)]
    A --> F[Pressure Test Declaration: 3.0 MN/m²]
    A --> G[Year of Manufacture]

This ensures clear identification of extinguisher class, compliance, and manufacturing details per IS 14951.

IS 14951: Performance Requirements Summary

1. Performance Test (Clause 1.2.4 & 11.1)

• Sampling: One sample per lot.
• Acceptance: Sample must pass the test for lot conformity.

2. Materials for Construction (Table 1, Clause 5)

3. Sampling & Conformity (Annex B)

• High reliability required due to risk.
• Adequate design and manufacturing control emphasized.
• Sampling details and acceptance criteria per Annex B.

4. Paint Requirements (Clause 10.4)

• Paint must conform to IS 2932.

Key Notes:

• Performance test ensures reliability.
• Material standards ensure durability and compatibility.
• Sampling criteria ensure lot conformity.

flowchart TD
    A[Start: Sample from Lot] --> B{Performance Test}
    B -- Pass --> C[Lot Accepted]
    B -- Fail --> D[Lot Rejected]
    C --> E[Marking per Clause 12]
    D --> F[Rework or Reject Lot]

This concise summary covers the essential performance requirements, materials, and conformity criteria from IS 14951.

IS 14951 - Testing: Key Formulas, Tables & Specifications

Sampling & Criteria for Conformity (Annex B)

• Performance Test (Clause 11.1):

  • One sample tested per lot.
  • Sample must pass for lot acceptance.

• Bursting Pressure Test (Clause 11.4):

  • One type test required.
  • Must meet specified bursting pressure values.

• Sample Size (Clause B-1.2.1):

  • Number of samples depends on lot size (refer Annex B for detailed sampling plan).

Testing Guidelines:

• Fire extinguishers require high reliability; testing ensures safety and performance.
• Tests include bursting pressure, performance, and material compliance.
• Referenced IS standards (e.g., IS 3203 for coating thickness, IS 3601 for steel tubes) guide material testing.

Summary Table: Testing Samples & Tests

For detailed sampling plans and conformity criteria, consult Annex B of IS 14951.

flowchart TD
    A[Start: Manufacturing] --> B[Sampling as per Annex B]
    B --> C{Test Type}
    C -->|Performance| D[Test 1 sample per lot]
    C -->|Bursting Pressure| E[1 type test]
    D --> F{Pass?}
    E --> F
    F -->|Yes| G[Lot Accepted]
    F -->|No| H[Lot Rejected]

Note: Always refer to the latest IS 14951 and relevant referenced IS codes for precise test methods and acceptance limits.

IS 14951: Sampling and Criteria for Conformity

Key Points from Clause 13 and Annex B:

• Sampling: Samples are selected at random from each lot.
• Number of Samples: As per Column 2 of Table 2 (not fully provided here), the number of samples depends on the lot size.
• Criteria for Conformity:
  • All tested samples must pass the specified tests for the lot to be accepted.
  • This ensures high reliability of fire extinguishers.

Summary Table (Typical Sampling Plan)

(Note: Refer IS 14951 Table 2 for exact values)

Conformity Criteria:

• All samples tested must pass the tests (Clause B-1.2.3.1).
• Failure in any sample means the entire lot is rejected.

Visual: Sampling Process Flow

flowchart TD
    A[Start: Lot Received] --> B[Select Random Samples]
    B --> C[Test Samples as per IS 14951]
    C --> D{All Samples Passed?}
    D -- Yes --> E[Lot Accepted]
    D -- No --> F[Lot Rejected]

Note: For exact sample sizes and test details, refer to Annex B and Table 2 of IS 14951.

IS 14951: Safety Features for 135 L Mechanical Foam Fire Extinguisher

Key Specifications & Formulas

• Safety Pressure Release Valve (Clause 7.7):

  • Activates automatically if internal pressure > 25 kg/cm² to prevent rupture.

• Body Thickness Formula (Clause 7):
  [ t = \frac{D}{100} ] where:

  • ( t ) = minimum thickness of mild steel sheet (mm)
  • ( D ) = diameter of the cylindrical body (mm)

• CO₂ Gas Cylinder (Clause 7.14):

  • Capacity: 1 kg, conforming to IS 7285
  • Charge: Foam concentrate per IS 4989 (Part 2)
  • Foam solution volume: 135 litres
  • Foam concentrate quantity:
    • 6% concentrate: ≥ 8 litres
    • 3% concentrate: ≥ 4 litres
  • Balance made up with water

Materials for Safety-Critical Components (Table 1 Highlights)

Summary Diagram: Safety Pressure Release Valve Operation

flowchart LR
    A[Internal Pressure Increases] --> B{Pressure > 25 kg/cm²?}
    B -- No --> C[Normal Operation]
    B -- Yes --> D[Release Valve Opens]
    D --> E[Pressure Released Safely]
    E --> C

Note: All materials and components must conform to the respective IS standards listed in Annex A for reliability and safety.

Wheeled Carriage Specifications (IS 14951: Clauses 7.13 & 7.14)

• Wheel Size:

  • Diameter: 405 mm
  • Width: 50 mm
  • Thickness: 25 mm
  • Type: Rubber-tyred wheels

• Axle:

  • Material: Mild steel rod
  • Minimum diameter: 25 mm

Material Specifications for Fire Extinguisher Components (Table 1, Clause 7.14)

Additional Notes:

• The minimum sheet thickness of the extinguisher body = D/100 (D = diameter in mm).
• The CO2 gas cylinder must conform to IS 7285.

• Foam concentrate quantity for 135 L solution:

IS 14951 Annexes Summary: Key Formulas, Tables & Specifications

Annex A: List of Referenced Indian Standards

• Contains IS codes related to materials, testing, and components relevant to 135 L mechanical foam fire extinguishers.
• Examples:
  • IS 1239 (Part 1): Mild steel tubes
  • IS 7285: Fire extinguisher specifications
  • IS 3618: Phosphate treatment for corrosion protection
  • IS 3203: Testing electroplated coatings thickness

Annex B: Sampling and Criteria for Conformity

• Emphasizes high reliability due to critical safety function.
• Requires adequate design and manufacturing controls.
• Sampling procedures ensure conformity with performance standards.

Key Formula for Body Thickness (Clause 7)

• Minimum sheet thickness for cylindrical body:

[ t = \frac{D}{100} ]

Where:

• ( t ) = minimum thickness (mm)
• ( D ) = diameter of the extinguisher body (mm)

Important Specifications

• Capacity: 135 litres total liquid capacity.
• Shape: Cylindrical body.
• Expulsion: Foam expelled by pressure from compressed or liquefied gas cylinder.
• Finish: Smooth, free of burrs and sharp edges (Amendment 2, Clause 10.1).

Summary Diagram: Fire Extinguisher Components (Fig. 1 reference)

graph TD
    A[Gas Cylinder] --> B[Pressure]
    B --> C[Extinguisher Body (Cylindrical)]
    C --> D[Mechanical Foam Liquid]
    D --> E[Nozzle for Foam Discharge]
    C --> F[Trolley Wheels]

For detailed sampling, testing, and material specs, refer to Annex B and Table 1 of IS 14951.