Extended Branch Pipe for Fire Brigade Use

IS 11101: Scope & Key Specifications Summary

Scope (Clause 0.2):

• Specifies Extended Branch Pipe for fire brigade use.
• Designed to spray water inside burning combustible stacks (coal, hay, sawdust) without breaking them open.
• Enables fighting deep-seated fires efficiently, minimizing flare-ups and labor.

Key Specifications:

• Material:
  • Shaft: Mild steel pipe (galvanized) per IS 1239 (Part 1)-1979 or Aluminium pipe per IS 738-1977.
• Threads: To suit nozzle as per Fig. 1 (standardized).
• Tolerance: ±0.2 mm for unspecified dimensions.
• Dimensions: All in millimeters.

Marking (Clause 11.3):

• Marking details are standardized (see Table 6).

Rounding Off (Clause 0.3):

• Final test values rounded per IS 2-1960, matching significant figures of specified values.

Relevant Units (SI Units from IS 11101)

Typical Construction Elements (Clause 3)

• Shaft pipe (mild steel or aluminum)
• Threaded ends for nozzle attachment
• Extended length for deep penetration

flowchart LR
    A[Fire Brigade Need] --> B[Extended Branch Pipe]
    B --> C[Material: Mild Steel / Aluminum]
    B --> D[Threaded Nozzle Connection]
    B --> E[Sprays Water Deep into Combustibles]
    E --> F[Suppresses Deep-Seated Fires]

For detailed dimensional tables and marking refer to IS 11101 Clause 11.3 and Fig. 2.

IS 11101 - Materials Key Specifications & Formulas

1. Aluminium Alloy (Clause 2.1)

   • Must conform to IS: 617 (Designation 4450, 4225, 4600).
   • Used for castings.
   • Ensures mechanical and chemical properties suitable for engineering purposes.

2. Shaft Material (Clause 2.3)

   • Mild steel pipe (galvanized) per IS: 1239 (Part 1)-1979.
   • Aluminium pipe per IS: 738-1977.
   • Threads to match nozzle as per Fig. 1.

3. Tolerance

   • Unless specified, ±0.2 mm for all dimensions.

4. Threading

   • Female threads follow G 1¼ as per IS: 2643 (Part I).

5. Units

   • SI units are used throughout (e.g., length in meters, force in Newtons).

Summary Table: Materials & Standards

Important Formula

• Force (N) = Mass (kg) × Acceleration (m/s²)
  ( 1 , \text{N} = 1 , \text{kg} \cdot m/s^2 )

flowchart TD
    A[Materials] --> B[Aluminium Alloy]
    A --> C[Mild Steel Pipe]
    A --> D[Aluminium Pipe]
    B --> E[IS: 617]
    C --> F[IS: 1239 Part 1]
    D --> G[IS: 738]
    A --> H[Threads]
    H --> I[IS: 2643 Part I]

This concise summary covers materials, standards, tolerance, and threading per IS 11101.

IS 11101 - Construction Key Points & Specifications

• Material for Shafts (Clause 2.3):

  • Mild steel pipe (galvanized) per IS 1239 (Part 1) - 1979
  • Aluminium pipe per IS 738 - 1977
  • Threads to suit nozzle (see Fig. 1 in IS 11101)

• Tolerance:

  • Unless specified, dimension tolerance is ±0.2 mm

• Marking (Clause 11.3):

  • Extended branch pipes may carry ISI Certification Mark
  • ISI Mark ensures compliance with quality & inspection standards

• Threads:

  • Female threads as per G 1 1/4 of IS 2643 (Part 1)

• Units:

  • All dimensions in mm
  • Use SI units for force, pressure, etc. (e.g., N, Pa)

Summary Table for Construction Materials

Typical Dimensioning & Tolerance

flowchart TD
    A[Construction Components] --> B[Shaft]
    B --> C[Mild Steel Pipe (IS 1239)]
    B --> D[Aluminium Pipe (IS 738)]
    A --> E[Threads]
    E --> F[Female Thread G 1 1/4 (IS 2643)]
    A --> G[Marking]
    G --> H[ISI Certification Mark]

This ensures compatibility, quality, and standardization for fire brigade extended branch pipes per IS 11101.

IS 11101: Workmanship and Finish - Key Points

Clause 4.1: Workmanship and Finish

• All parts must be of good workmanship and finish.
• Forgings and castings must be sound, free from pits, scales, cracks, and imperfections.
• No repairs or fillings that hide casting defects are allowed.
• All burrs and sharp edges must be removed to ensure safety and proper fit.

Specifications Summary:

Tolerances:

• Unless specified, dimensional tolerance = ±0.2 mm (Clause 11.3 note).

Additional Notes:

• Extended branch pipes may carry the ISI Certification Mark (Clause 6.1.1).
• Threads conform to IS: 2643 (Part 1) for female threads.
• Materials used (galvanized mild steel, aluminum, leaded tin bronze) must meet relevant IS specifications.

flowchart TD
    A[Raw Forging/Casting] --> B{Inspection}
    B -->|Defects found| C[Reject or Recast]
    B -->|No Defects| D[Remove Burrs & Sharp Edges]
    D --> E[Final Finish Check]
    E -->|Pass| F[Approved Product]
    E -->|Fail| C

Summary: IS 11101 mandates defect-free, well-finished components with strict removal of sharp edges and burrs, ensuring safety and durability in fire-fighting equipment.

IS 11101 Leakage Test Key Points

• Test Pressure: Hydrostatic pressure of 2.1 MN/m² (21 kgf/cm²).
• Test Duration: Minimum 2½ minutes.
• Acceptance Criteria: No leakage in castings or joints.
• Preparation: All holes sealed before testing.
• Material Note: Castings in Leaded-Tin-Bronze conforming to IS 318:1981 (LTB 2).

Leakage Test Procedure (Clause 5.1)

Important Specifications

• Workmanship: No pits, cracks, burrs, or hidden repairs (Clause 4.1).
• Tolerance: ±0.2 mm unless otherwise specified (Clause 11.3).

Summary Diagram of Leakage Test Setup

flowchart LR
    A[Branch Pipe Assembly] --> B[Seal all holes]
    B --> C[Apply Hydrostatic Pressure 2.1 MN/m²]
    C --> D[Maintain for 2½ minutes]
    D --> E{Leakage?}
    E -- No --> F[Pass Test]
    E -- Yes --> G[Fail Test]

This ensures the pipe assembly integrity under pressure as per IS 11101 standards.

IS 11101 - Marking Specifications (Clause 6.1 & 11.3)

• Marking Requirements for Extended Branch Pipe (Clause 6.1):

  • Manufacturer's name or trade-mark
  • Year of manufacture
  • ISI Certification Mark (optional but recommended for quality assurance, Clause 6.1.1)

• Tolerance:

  • Unless otherwise specified, dimensional tolerance is ±0.2 mm (Clause 11.3)

• Marking Characteristics:

  • Marking must be permanent and clear
  • All dimensions are in millimetres (mm)
  • Female threads follow IS: 2643 (Part I) standards

Summary Table for Marking

Notes:

• ISI Mark ensures compliance with IS standards and quality control.
• Marking should withstand environmental and operational conditions without fading.

flowchart TD
    A[Extended Branch Pipe] --> B[Manufacturer's Name/Trade-mark]
    A --> C[Year of Manufacture]
    A --> D[ISI Certification Mark (optional)]
    style B fill:#f9f,stroke:#333,stroke-width:1px
    style C fill:#f9f,stroke:#333,stroke-width:1px
    style D fill:#bbf,stroke:#333,stroke-width:1px

This ensures traceability, quality assurance, and standard compliance per IS 11101.