Extended Branch Pipe for Fire Brigade Use
1984 Edition

Overview of Extended Branch Pipe Usage

Scope (Clause 0.2):

• Defines extended branch pipes intended for fire brigade deployment.
• Designed to deliver water into burning combustible stacks such as coal, hay, or sawdust without dismantling them.
• Enables effective suppression of deep-seated fires, reducing flare-ups and manual effort.

Principal Specifications:

• Materials:
  • Shafts made from galvanized mild steel pipes complying with IS 1239 (Part 1)-1979 or aluminium pipes conforming to IS 738-1977.
• Threading: Compatible with nozzles as per Fig. 1 of the standard.
• Dimensional Tolerance: ±0.2 mm where not otherwise specified.
• Units: All measurements in millimetres.

Marking Requirements (Clause 11.3):

• Standardized marking details outlined in Table 6.

Rounding Off (Clause 0.3):

• Final test results rounded following IS 2-1960 guidelines to match significant figures of prescribed values.

Units of Measurement (SI Units per IS 11101)

Typical Construction Features (Clause 3)

• Shaft constructed from mild steel or aluminium pipe
• Threaded ends designed for nozzle attachment
• Extended length to allow deep penetration into combustible stacks

flowchart LR
    A[Fire Brigade Requirement] --> B[Extended Branch Pipe]
    B --> C[Material: Galvanized Mild Steel / Aluminium]
    B --> D[Threaded Connection for Nozzle]
    B --> E[Water Spray into Deep Combustibles]
    E --> F[Efficient Deep-Seated Fire Suppression]

For detailed dimensional data and marking references, consult IS 11101 Clause 11.3 and Figure 2.

Key Material Specifications Under IS 11101

1. Aluminium Alloy Castings (Clause 2.1)

   • Must meet IS 617 standards (designations 4450, 4225, 4600).
   • Used primarily for cast components.
   • Ensures mechanical strength and chemical stability suitable for engineering applications.

2. Shaft Material (Clause 2.3)

   • Galvanized mild steel pipes conforming to IS 1239 (Part 1)-1979.
   • Aluminium pipes complying with IS 738-1977.
   • Threading designed to match nozzle specifications (Fig. 1).

3. Dimensional Tolerance

   • ±0.2 mm applied to all unspecified dimensions.

4. Threading Specifications

   • Female threads as per G 1¼ standard in IS 2643 (Part I).

5. Units Usage

   • SI units applied consistently (length in meters, force in Newtons, etc.).

Materials and Applicable Standards Summary

Fundamental Formula

• Force (N) = Mass (kg) × Acceleration (m/s²)
  (1 Newton = 1 kilogram × meter per second squared)

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

This summary encapsulates materials, standards, tolerances, and threading details as outlined in IS 11101.

Construction Specifications as per IS 11101

• Shaft Material (Clause 2.3):

  • Galvanized mild steel pipes adhering to IS 1239 (Part 1)-1979.
  • Aluminium pipes complying with IS 738-1977.
  • Threading compatible with nozzles described in Fig. 1.

• Tolerance: ±0.2 mm for all dimensions unless otherwise stated.

• Marking (Clause 11.3):

  • Pipes may bear the ISI certification mark, confirming compliance with quality and inspection norms.

• Threading: Female threads following G 1¼ standard as per IS 2643 (Part 1).

• Units: All dimensions expressed in millimetres, with SI units applied for force and pressure (e.g., newtons, pascals).

Construction Materials Overview

Dimensional Tolerances

flowchart TD
    A[Construction Components] --> B[Shaft]
    B --> C[Galvanized Mild Steel Pipe (IS 1239)]
    B --> D[Aluminium Pipe (IS 738)]
    A --> E[Threads]
    E --> F[Female Thread G 1¼ (IS 2643)]
    A --> G[Markings]
    G --> H[ISI Certification]

This ensures standardized fabrication, compatibility, and quality assurance for fire brigade extended branch pipes.

Workmanship and Surface Finish Requirements per IS 11101

Clause 4.1 Highlights:

• All components must exhibit superior workmanship and finish.
• Forged and cast parts should be free from defects such as pits, scaling, cracks, or other imperfections.
• Repairs or fillings that conceal casting flaws are strictly prohibited.
• All burrs and sharp edges must be carefully removed to ensure safety and proper assembly.

Workmanship Criteria Summary

Dimensional Tolerance

• Default tolerance is ±0.2 mm unless specified otherwise (Clause 11.3).

Additional Information

• Extended branch pipes may carry the ISI certification mark confirming standard compliance (Clause 6.1.1).
• Threading adheres to IS 2643 (Part 1) female thread specifications.
• Materials such as galvanized mild steel, aluminium, and leaded tin bronze comply with respective IS standards.

flowchart TD
    A[Raw Forging or Casting] --> B{Inspect for Defects}
    B -->|Defects Present| C[Reject or Recast]
    B -->|No Defects| D[Remove Burrs and Sharp Edges]
    D --> E[Final Inspection]
    E -->|Pass| F[Approve Product]
    E -->|Fail| C

Summary: IS 11101 mandates flawless manufacturing with strict removal of sharp edges, ensuring durability and safety in firefighting equipment.

Leakage Test Procedures per IS 11101

• Test Pressure: Hydrostatic pressure set at 2.1 MN/m² (equivalent to 21 kgf/cm²).
• Duration: Maintain pressure for at least 2.5 minutes.
• Acceptance: No leakage permitted in castings or joints.
• Preparation: All openings must be sealed prior to testing.
• Material Note: Castings made from leaded-tin bronze must conform to IS 318:1981 (LTB 2 grade).

Stepwise Leakage Test (Clause 5.1)

Relevant Specifications

• Workmanship: Components must be free from pits, cracks, burrs, or concealed repairs (Clause 4.1).
• Tolerance: ±0.2 mm unless otherwise specified (Clause 11.3).

Leakage Test Flowchart

flowchart LR
    A[Branch Pipe Assembly] --> B[Seal All Openings]
    B --> C[Apply Hydrostatic Pressure 2.1 MN/m²]
    C --> D[Maintain for 2.5 minutes]
    D --> E{Leakage Detected?}
    E -- No --> F[Test Passed]
    E -- Yes --> G[Test Failed - Reject or Repair]

This testing ensures assembly integrity and compliance with safety standards.

Marking Guidelines Under IS 11101 (Clauses 6.1 and 11.3)

• Mandatory Markings on Extended Branch Pipes:

  • Manufacturer’s name or trademark
  • Year of manufacture
  • ISI Certification Mark (optional but highly recommended for quality assurance, Clause 6.1.1)

• Dimensional Tolerance: ±0.2 mm unless otherwise stated (Clause 11.3).

• Marking Characteristics:

  • Markings must be permanent, legible, and durable.
  • All dimensions indicated in millimetres.
  • Female threads comply with IS 2643 (Part I).

Marking Summary Table

Notes:

• The ISI mark confirms adherence to Indian Standards and continuous quality monitoring.
• Markings should withstand environmental exposure and operational wear without fading.

flowchart TD
    A[Extended Branch Pipe] --> B[Manufacturer Name/Trademark]
    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 guarantees traceability, quality assurance, and compliance as per IS 11101.