Functional requirements for twin co2 fire extinguishers (trolley mounted)
1994 Edition

Overview of Scope and Applicator Assembly Details

Applicator Tube (Clause 4.2):

• Extended length: (3.5 ± 0.25) meters from nozzle center to grip valve base.
• Components: Includes a telescoping tube, lever-operated grip valve (inlet), elbow joint, and discharge horn with nozzle.
• Construction: Designed to be sturdy yet lightweight for ease of handling.
• Connections:
  • Applicator tube base threads onto grip valve.
  • Grip valve connects via threads to a tee fitting (connecting grip valve, hose, and trolley socket).
• Telescoping Mechanism:
  • Extends by gas pressure or manually.
  • Lockable in extended position with a knurled ring.
  • Retracts manually.
• Valve: Spring-loaded lever that opens under pressure and closes automatically; must show zero leakage during 300 kgf/cm² hydrostatic testing.
• Safety Features: Incorporates a safety vent with copper bursting disc per IS 3224:1979.
• Insulation: Handles are insulated at ergonomic points on the outer tube.

Nozzle (Clause 4.6):

• Length: (75 ± 5) mm overall.
• Internal Diameter: (19 ± 1) mm.
• Discharge Orifices: Six in number, each measuring (2 ± 1) mm in width and (25 ± 0.5) cm in length.
• Performance: Designed for forceful discharge lasting between 45 to 160 seconds.
• Inlet: Minimum 14 mm threaded length with an external hexagonal profile.

Applicator and Nozzle Dimension Summary

These requirements ensure ergonomic, safe, and dependable operation of the twin CO2 extinguisher applicator as per this standard.

IS 8149:1994 (reaffirmed 2010) primarily outlines the functional specifications for trolley-mounted twin CO2 fire extinguishers.

Related Standards:

• Portable Fire Extinguishers:

  • ABC type dry powder (1 kg, stored pressure) as per IS 13849:1993
  • Halo-carbon clean agents conforming to IS 15493:2004

• Body Finish Requirements (Clause 6.2):

  • The extinguisher body must be smoothly finished, free from burrs and sharp edges.

Key Indian Standards Referenced:

Summary:

• IS 8149 emphasizes design and operational aspects for twin CO2 extinguishers.
• IS 13849 provides specifications for dry powder extinguishers.
• IS 15493 covers clean agent gaseous systems.

For detailed formulas related to capacity, discharge timing, or pressure, consult IS 13849 and IS 15493 directly.

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 Requirements]
    C --> E[Agent & Discharge Specifications]

IS 8149:1994 sets forth the functional criteria for trolley-mounted twin CO2 fire extinguishers. Important definitions and related specifications include:

Key Terms:

• Portable Fire Extinguisher: A device meeting either IS 13849 (dry powder type) or IS 15493 (halo-carbon clean agent type) standards.
• Twin CO2 Fire Extinguisher: A fire extinguisher mounted on a trolley equipped with two CO2 cylinders, intended for swift fire suppression.

Important Specifications:

• Body Surface: Should be smooth, free from burrs and sharp edges (Clause 6.2).
• Extinguisher Types: Stored pressure devices using ABC dry powder or halo-carbon clean agents.
• Referenced Standards:
  • IS 13849 for dry powder extinguishers.
  • IS 15493 for gaseous extinguishing systems.

Typical Parameters (Derived from IS 13849 & IS 8149):

Summary:

• Refer to IS 13849 for dry powder extinguisher specifications.
• Refer to IS 15493 for gaseous agent requirements.
• Twin CO2 extinguishers must have smooth, burr-free bodies.
• Functional standards ensure reliable and safe firefighting equipment.

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

IS 8149: Functional Specifications for Twin CO2 Fire Extinguishers on Trolleys

Principal Requirements

• Body Quality: Extinguisher bodies must exhibit a smooth finish, devoid of burrs and sharp edges (Clause 6.2, updated 2010).

• Extinguishing Agents:

  • Primary agents are twin CO2 cylinders.
  • Portable extinguishers may also employ ABC dry powder (per IS 13849) or halo-carbon clean agents (per IS 15493).

• Relevant Standards:

  • IS 13849 for portable dry powder extinguishers.
  • IS 15493 for gaseous fire suppression systems.

Functional Summary

Notes

• The standard prioritizes safe handling, mobility, and agent efficacy.
• Detailed pressure ratings, capacity, and testing procedures are specified in referenced IS documents.

flowchart LR
    A[Extinguisher Body] --> B[Smooth Finish, Burr-Free]
    A --> C[Pressure Ratings per IS 13849 / CO2 Standards]
    D[Extinguishing Agent] --> E[CO2 Cylinders]
    D --> F[ABC Dry Powder (IS 13849)]
    D --> G[Halo-Carbon Agents (IS 15493)]
    H[Trolley Mounting] --> I[Mobility and Operational Ease]

IS 8149: Materials and Workmanship Essentials

• Clause 5.1:

  • All cast and hot-pressed parts must be free from defects such as porosity or other imperfections to maintain structural strength.

• Clause 5.3:

  • Manufacturing machinery should comply with IS 3073:1967.
  • Burrs and sharp edges must be removed; surfaces should be smoothly finished to reduce stress points and ensure safety.

• Material Specifications:

  • Trolley fabrication requires mild steel (M.S.) sections as specified in Clause 3.7.

Summary Table: Material and Workmanship Requirements

Additional Notes:

• Proper finishing enhances fatigue resistance.
• Visual and dimensional inspections are required for quality assurance.

flowchart TD
    RawMaterial --> CastingOrPressing
    CastingOrPressing --> Inspection[Check for Porosity/Defects]
    Inspection -->|Pass| Machining[Machinery Processing (IS 3073)]
    Machining --> Finish[Remove Burrs & Smooth Finish]
    Inspection -->|Fail| ReworkOrReject
    Finish --> Fabrication[Mild Steel Section Fabrication]

IS 8149: Guidelines for Painting and Identification Markings

• Surface Preparation (Clause 6.1):

  • Thorough cleaning to remove rust, scale, and grease.
  • Ensure surfaces are even and smooth prior to painting.

• Painting Specifications (Clause 6.2):

  • Extinguisher bodies (excluding valve heads, applicator tubes, and moving parts) must be painted Fire Red.
  • Fire Red corresponds to IS 5:1978, Shade No. 536.
  • Paint used should conform to IS 2932:1974 (fire protective paints).

• Machinery Standards (Clause 5.3):

  • Follow IS 3073:1967 for machinery requirements.
  • Burrs must be removed and surfaces finished smoothly.

Summary Table

flowchart TD
    CleanSurface --> RemoveRustScaleGrease
    RemoveRustScaleGrease --> SmoothSurface
    SmoothSurface --> ApplyFireRedPaint(IS2932)
    ApplyFireRedPaint --> ExcludeValveAndApplicatorParts

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

Important Points:

• CO2 cylinders up to 22.5 kg single units are covered under IS 2878.
• Twin cylinders facilitate easier handling and maintenance.
• Dry powder extinguishers of ABC type must comply with IS 13849.
• Halo-carbon clean agents must adhere to IS 15493.
• Extinguisher bodies are required to have smooth, burr-free finishes (Clause 6.2).

Rounding Guidelines:

• Numerical values should follow IS 2:1960 for rounding, maintaining the same significant figures as specified.

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

Overview of IS 8149 Committee Structure

The Fire Fighting Sectional Committee (CED 22) responsible for IS 8149 comprises representatives from government departments, industrial sectors, and technical experts.

Key Membership:

• Chair: Fire Adviser, Ministry of Home Affairs
• Members Include:
  • Ministry of Home Affairs (Fire Services, Central Industrial Security Force)
  • Ministry of Defence (Director General of Inspection, Research & Development)
  • Urban Development Authorities (from Mumbai, Delhi, Tamil Nadu)
  • Industry representatives (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), Bureau of Indian Standards

Purpose:

• To guide the development and revision of fire fighting equipment standards, including twin CO2 extinguishers.
• To ensure balanced representation from all relevant stakeholders.

Committee Structure Diagram

graph LR
    HomeAffairs[Ministry of Home Affairs] --> Chair[Fire Adviser (Chairman)]
    HomeAffairs --> CISF[Central Industrial Security Force]
    Defence[Ministry of Defence] --> DGI[DGI & R&D Representatives]
    UrbanDev[Urban Development] --> FireServices[Municipal Fire Services]
    Industry[Industries] --> SteelOilGas[Steel, Oil & Gas, Fire Protection]
    TechInst[Technical Institutes] --> CBRI_Metallurgy[CBRI, Metallurgical Consultants]
    BIS[Bureau of Indian Standards] --> DG[Director General (Ex-officio)]
    Chair --> Sec[Member Secretary (Joint Director, BIS)]