Functional requirements for twin co2 fire extinguishers (trolley mounted)

IS 8149: Scope - Key Specifications & Design Requirements

Applicator Assembly (Clause 4.2):

• Length (extended): (3.5 ± 0.25) m from discharge nozzle center to base of grip valve.
• Components: Telescope tube, lever-type grip valve (inlet), elbow, discharge horn with nozzle.
• Construction: Rigid yet lightweight for handling.
• Connections:
  • Base of applicator tube screwed to grip valve.
  • Grip valve screwed to tee piece (one end for grip valve, one for hose, one for chassis frame socket).
• Telescopic Action:
  • Extendable by gas pressure or hand.
  • Knurled ring to lock extended position.
  • Hand-operated closing.
• Valve: Spring-loaded lever; opens on pressure, closes automatically; no leakage at 300 kgf/cm² hydrostatic test.
• Safety: Safety vent with copper bursting disc per IS 3224:1979.
• Insulation: Grips at convenient points on outer tube.

Nozzle (Clause 4.6):

• Length: (75 ± 5) mm overall.
• Internal Diameter: (19 ± 1) mm.
• Discharge Orifices: Six orifices, each 2 ± 1 mm wide and 25 ± 0.5 cm long.
• Function: Forceful discharge within 45-160 seconds.
• Inlet: Screwed minimum 14 mm length, externally hexagonal.

Summary Table: Applicator & Nozzle Dimensions

This ensures reliable, ergonomic, and safe operation of the twin CO2 fire extinguisher applicator assembly as per IS 8149.

IS 8149:1994 (Reaffirmed 2010) primarily specifies functional requirements for twin CO2 fire extinguishers (trolley mounted).

Key References & Specifications:

• Portable Fire Extinguishers:

  • 1 kg ABC type Dry Powder (stored pressure) as per IS 13849:1993
  • Halo-carbon clean agents as per IS 15493:2004

• Body Requirements (Clause 6.2):

  • The extinguisher body must have a good finish, free from burrs and sharp edges.

Relevant IS Codes:

Summary:

• IS 8149 focuses on design & functional aspects for twin CO2 extinguishers.
• Refer to IS 13849 for dry powder extinguisher specs.
• Refer to IS 15493 for clean agent systems.

If you need formulas or tables for extinguisher capacity, discharge time, or pressure, those are detailed in IS 13849 and IS 15493 respectively.

flowchart LR
    A[IS 8149: Twin CO2 Extinguishers] --> B[IS 13849: Dry Powder Extinguishers]
    A --> C[IS 15493: Clean Agent Systems]
    B --> D[Design & Pressure Specs]
    C --> E[Agent & Discharge Specs]

For detailed design, consult IS 13849 and IS 15493 directly.

IS 8149 (1994) primarily defines functional requirements for twin CO2 fire extinguishers (trolley mounted). The key definitions and specifications relevant are:

Key Definitions (from context & related IS)

• Portable Fire Extinguisher: A device conforming to IS 13849 (Dry Powder type) or IS 15493 (Halo-carbon clean agent types).
• Twin CO2 Fire Extinguisher: A trolley-mounted extinguisher with two CO2 cylinders, designed for rapid fire suppression.

Important Specifications:

• Body finish: Must be smooth, free from burrs and sharp edges (Clause 6.2).
• Extinguisher type: Stored pressure, ABC dry powder or halo-carbon clean agents.
• Standards referenced:
  • IS 13849: Specification for dry powder portable extinguishers.
  • IS 15493: Requirements for gaseous fire extinguishing systems.

Typical Parameters (from IS 13849 & IS 8149 general practice):

Summary:

• Use IS 13849 for dry powder extinguisher specs.
• Use IS 15493 for gaseous agent systems.
• Twin CO2 extinguishers must have smooth, burr-free bodies.
• Functional requirements ensure safe, effective fire fighting.

flowchart LR
    A[IS 8149: Twin CO2 Extinguisher] --> B[Body: Smooth, burr-free]
    A --> C[Conforms to IS 13849 or IS 15493]
    C --> D[Dry Powder Extinguisher (IS 13849)]
    C --> E[Halo-carbon Clean Agent (IS 15493)]
    A --> F[Typical Specs: 2 x 5kg CO2 Cylinders]

For detailed formulas or dimensions, refer to IS 13849 and IS 15493 directly.

IS 8149: Functional Requirements for Twin CO2 Fire Extinguishers (Trolley Mounted)

Key Specifications & Functional Requirements

• Body Quality: Extinguisher body must have a good finish, free from burrs and sharp edges (Clause 6.2, Amendment 2010).

• Extinguishing Agent:

  • Twin CO2 cylinders as the primary agent.
  • Portable extinguishers may use ABC dry powder (IS 13849) or halo-carbon clean agents (IS 15493) as alternatives.

• Standards Referenced:

  • IS 13849: Specification for portable dry powder extinguishers (constant pressure).
  • IS 15493: General requirements for gaseous fire extinguishing systems.

Functional Criteria (Summary)

Notes

• The standard emphasizes safe handling, mobility, and agent effectiveness.
• Details on pressure ratings, capacity, and performance tests are covered in referenced IS codes.

flowchart LR
    A[Extinguisher Body] --> B[Good Finish, Burr-Free]
    A --> C[Pressure Rated per IS 13849 / CO2 Standards]
    D[Extinguishing Agent] --> E[CO2 Cylinders]
    D --> F[ABC Dry Powder (IS 13849)]
    D --> G[Halo-Carbon Clean Agent (IS 15493)]
    H[Trolley Mount] --> I[Mobility & Ease of Use]

For detailed design and testing, refer to IS 13849 and IS 15493 alongside IS 8149.

IS 8149: Materials and Workmanship - Key Points

• Clause 5.1:

  • All castings and hot-pressed parts must be clean, sound, and free from porosity or imperfections.
  • Ensures structural integrity and durability.

• Clause 5.3:

  • Machinery used must comply with IS 3073:1967.
  • All burs and sharp edges must be removed and surfaces smooth finished to avoid stress concentrations and ensure safety.

• Material Specification:

  • Use M.S. (Mild Steel) sections for fabrication of trolleys (Clause 3.7).

Summary Table: Material & Workmanship Checks

Additional Notes:

• Proper finishing improves fatigue resistance.
• Visual and dimensional inspections are essential to ensure compliance.

flowchart TD
    A[Raw Material] --> B[Casting / Hot Pressing]
    B --> C[Inspection for Porosity & Defects]
    C --> D{Pass?}
    D -- Yes --> E[Machinery Processing (IS 3073)]
    E --> F[Remove Burs & Smooth Finish]
    D -- No --> G[Reject or Rework]
    F --> H[Fabrication (M.S. Sections)]

This ensures quality and durability per IS 8149 standards.

IS 8149: Painting and Marking Key Points

• Surface Preparation (Clause 6.1):

  • Clean all surfaces thoroughly.
  • Remove rust, scale, grease.
  • Ensure smooth, even finish before painting.

• Painting Specifications (Clause 6.2):

  • Paint extinguishers (except valve heads, applicator tubes, working parts) with Fire Red.
  • Fire Red shade: IS 5 (1978), Shade No. 536.
  • Paint must conform to IS 2932:1974 (Paints for fire protection).

• Machinery Requirements (Clause 5.3):

  • Follow IS 3073:1967 for machinery.
  • Remove burs and sharp edges; smooth finish mandatory.

Summary Table

flowchart TD
    A[Surface Cleaning] --> B[Remove rust, scale, grease]
    B --> C[Smooth and even surface]
    C --> D[Apply Fire Red paint (IS 2932)]
    D --> E[Exclude valve heads, applicator tubes, working parts]

This ensures durability, visibility, and compliance with IS 8149 painting and marking standards.

IS 8149:1994 (First Revision) specifies functional requirements for twin CO2 fire extinguishers (trolley mounted). Key referenced Indian Standards include:

Important Notes:

• CO2 extinguishers up to 22.5 kg single cylinder covered under IS 2878.
• Twin cylinders used for ease of transport and maintenance.
• Dry powder extinguishers (ABC type) must conform to IS 13849.
• Halon-type or halo-carbon clean agents per IS 15493 are alternate agents.
• Cylinders must have a good finish, free from burrs and sharp edges (Clause 6.2).

Rounding off values:

• Follow IS 2:1960 for rounding off numerical results, keeping the same significant figures as specified.

flowchart LR
    A[IS 8149:1994 Twin CO2 Extinguishers] --> B[IS 2878:1986 CO2 Extinguisher Specs]
    A --> C[IS 13849:1993 Dry Powder Extinguishers]
    A --> D[IS 15493:2004 Gaseous Fire Extinguishing Systems]

This ensures compliance and compatibility with related fire extinguisher standards.

IS 8149: Committee Composition - Key Points

Committee Composition is detailed in Annex B of IS 8149, specifying the Fire Fighting Sectional Committee (CED 22) members representing various government bodies, industries, and technical experts.

Key Highlights:

• Chairman: Fire Adviser, Ministry of Home Affairs
• Members: Representatives from:
  • Ministry of Home Affairs (Fire Services, Central Industrial Security Force)
  • Ministry of Defence (DGI, R&D)
  • Urban Development Departments (Bombay, Delhi, Tamil Nadu)
  • Various industries (Steel Authority of India, Oil & Natural Gas Commission, Fire Protection Systems)
  • Technical institutions (Central Building Research Institute, Metallurgical & Engineering Consultants)
  • BIS (Director General, Ex-officio Member)
• Member-Secretary: Joint Director (Civil Engineering), BIS

Purpose:

• To oversee standards related to fire fighting equipment, including CO2 fire extinguishers.
• Ensure representation from key stakeholders for balanced and comprehensive standard development.

No specific formulas or tables are given for committee composition, but the detailed member list ensures multidisciplinary inputs for standard formulation.

graph LR
A[Ministry of Home Affairs] --> B[Fire Adviser (Chairman)]
A --> C[Central Industrial Security Force]
D[Ministry of Defence] --> E[DGI & R&D Representatives]
F[Urban Development] --> G[Municipal Fire Services]
H[Industries] --> I[Steel, Oil & Gas, Fire Protection]
J[Technical Institutes] --> K[CBRI, Metallurgical Consultants]
L[BIS] --> M[Director General (Ex-officio)]
B --> N[Member Secretary (Joint Director, BIS)]

This structure ensures a comprehensive and authoritative committee for IS 8149 standards development.