Firefighting vehicles and equipment - symbols for operator controls and other display

IS 15682: Scope - Key Specifications & Tables Summary

Scope (Clause 2.1):
Defines geometrical shapes and symbols for categories:

• Frame, Engine, and Chassis
• Electrical Circuits
• Tanks and Piping
• Pressure Vessels
• Aerial Appliances
• Miscellaneous

Important Tables & Symbols

Example: Frame, Engine & Chassis Symbols (Clause 3.1)

Notes

• Symbols represent operational states or components for clear graphical representation.
• Used for standardizing diagrams and controls in fire-fighting and related machinery.
• Refer to respective clauses for detailed symbol graphics and usage.

flowchart TD
    A[Scope] --> B[Frame, Engine & Chassis]
    A --> C[Tanks & Piping]
    A --> D[Electrical Circuits]
    A --> E[Pressure Vessels]
    A --> F[Aerial Appliances]
    A --> G[Miscellaneous]

    B --> B1[Engine start/stop]
    B --> B2[Rotational speed (Nmin)]
    B --> B3[Jacking systems]
    B --> B4[Axle-locking mechanism]

    C --> C1[Water tank fill/drain]
    C --> C2[Foam concentrate fill/drain]
    C --> C

IS 15682: General Requirements - Key Specifications & Symbols

The standard defines symbols and designations for firefighting system components:

1. Tank and Piping (Clause 3.5)

2. Fire Pump (Clause 3.4)

3. Miscellaneous (Clause 3.8)

Notes:

• The standard focuses on symbol designation for components rather than explicit formulas.
• For structural design and hydraulic calculations, refer to relevant IS codes like IS 456 (Concrete), IS 800 (Steel), and hydraulic design standards.
• Fire pump and piping design typically use standard hydraulic formulas:

[

IS 15682: Symbols for Fire Fighting Vehicles and Equipment

This standard specifies graphical symbols for operator controls and displays on fire fighting vehicles and equipment.

Key Points:

• Uniform Symbol Scale (Clause 2.4):
  All symbols on a drawing must be to the same relative scale, consistent with the drawing's scale. This ensures clarity and proportionality.

• Symbol Types (Clause 3):
  Symbols cover controls like:

  • Water pump operation
  • Foam system controls
  • Ladder controls
  • Siren and light controls
  • Other firefighting equipment interfaces

Typical Symbol Specifications:

Best Practices:

• Use standardized symbols to avoid confusion during emergencies.
• Maintain legibility and size consistency across all drawings.
• Refer to IS 15682 annexures (if available) for exact symbol shapes.

flowchart LR
    A[Fire Fighting Vehicle] --> B[Operator Controls]
    B --> C{Control Type}
    C --> D[Water Pump]
    C --> E[Foam System]
    C --> F[Ladder]
    C --> G[Siren & Lights]

For detailed symbol shapes and exact dimensions, consult the full IS 15682 document or related annexures.

IS 15682 - Key Specifications for Frame, Engine, and Chassis (Clause 3.1)

The standard provides symbolic designations for various components and functions related to the frame, engine, and chassis:

Important Notes:

• Rotational speed (N_min) is a key parameter for engine/chassis operation.
• Symbols for controls like engine start/stop, jacking systems, and axle locking are standardized for schematic representation.
• Continuous adjustments can be rotational or linear, useful for fine-tuning engine or chassis settings.

General Engineering Context:

• Frame design must ensure structural integrity under dynamic loads.
• Engine parameters such as rotational speed (N) are critical for performance and must be monitored.
• Chassis components like jacks and axle locks ensure stability during maintenance or operation.

If you need design formulas or load calculations for frame and chassis, refer to IS 800 or IS 456 for structural steel or concrete frames respectively.

graph LR
  EngineStart --> EngineStop
  EngineStart --> RotationalSpeed[N_min]
  RotationalSpeed --> AuxiliaryCooler
  JackingSystems --> VehicleStabilized
  VehicleStabilized --> HouseJacks[Î1]
  HouseJacks --> AxleLockOn
  HouseJacks --> AxleLockOff

This diagram shows the

IS 15682 - Electrical Circuits: Key Specifications & Symbols

1. Electrical Circuits (Clause 3.2, Table 3.2)

2. Miscellaneous Electrical Symbols (Clause 3.8, Table 3.8)

IS 15682 Key Details on Expellants (Clause 3.3)

Expellants Types & Symbols (Table 3.3)

Notes:

• Water is the primary expellant.
• Foam concentrate and Pre-mix foam solution are used for foam-based fire suppression.
• Powder is typically used in dry chemical systems.

Common Specifications (General Knowledge)

• Foam Concentrate: Usually mixed with water at 1%, 3%, or 6% depending on foam type.
• Pre-mix Foam Solution: Ready-to-use mixture of foam concentrate and water.
• Powder Expellants: Stored under pressure, discharged by gas or mechanical means.

Typical Formula for Foam Solution Preparation:

[ Q_f = C \times Q_w ] Where:

• (Q_f) = Foam concentrate flow rate
• (C) = Concentration (e.g., 0.03 for 3%)
• (Q_w) = Water flow rate

Summary Diagram of Expellant Flow:

flowchart LR
    Water -->|Mix| Foam_Concentrate
    Foam_Concentrate --> Pre_mix
    Pre_mix -->|Discharge| Fire_Fighting_System
    Powder -->|Direct Discharge| Fire_Fighting_System

For detailed symbols and piping, refer to Tables 3.4 (Fire Pumps), 3.5 (Tank and Piping), and 3.6 (Pressure Vessels) in IS 15682.

IS 15682 - Fire Pump Key Specifications & Symbols

1. Fire Pump Types (Clause 3.4, Table 3.4)

2. Fire Pump Components (Clause 3.4, Table 3.4)

3. Tank & Piping (Clause 3.5, Table 3.5)

General Fire Pump Design Considerations

IS 15682 - Tank and Piping (Clause 3.5) Key Points

1. Designations & Symbols (Clause 3.5 Tables)

2. Typical Formulas & Specifications (General Engineering Knowledge)

• Tank Volume (V):
  For cylindrical tanks,
  [ V = \pi r^2 h ]
  where r = radius, h = height.

• Pipe Flow (Darcy-Weisbach equation):
  [ \Delta P = f \frac{L}{D} \frac{\rho v^2}{2} ]
  where f = friction factor, L = pipe length, D = diameter, ρ = fluid density, v = velocity.

• Tank Filling Time:
  [ t = \frac{V}{Q} ]
  where Q = flow rate.

• Pressure Vessel Considerations (Clause 3.6):
  Pressure vessels must be designed as per IS 2825, considering maximum allowable working pressure (MAWP), material strength, and corrosion allowance.

3. Important Notes

• Fire pump connections (Clause 3.4) relate to water and foam concentrate filling/draining.
• Level indicators are essential

IS 15682 - Pressure Vessels: Key Points

Designations & Symbols (Clause 3.6 Table 3.6)

General Specifications (Typical for Pressure Vessels per IS standards)

• Design Pressure (P): Maximum allowable working pressure.
• Design Temperature (T): Operating temperature range.
• Material: Usually mild steel, stainless steel or alloy steel as per IS 2062, IS 1570.
• Thickness (t): Calculated by formula (for cylindrical shells):

[ t = \frac{P \times D}{2 \times \sigma \times \eta + P} ]

Where:

• (P) = Design pressure
• (D) = Internal diameter
• (\sigma) = Allowable stress of material
• (\eta) = Joint efficiency

Important Notes:

• Include corrosion allowance (usually 1.5-3 mm).
• Follow IS 2825 for design and fabrication.
• Provide safety valves for pressure regulation.
• Drain and decompression provisions must be incorporated.

Visual Concept (Pressure Vessel Components)

graph LR
A[Pressure Vessel] --> B[Inlet / Pressurizing Vessel]
A --> C[Outlet]
A --> D[Drain]
A --> E[Decompression Valve]
A --> F[Pressure Regulation Valve]
A --> G[Purging Valve]

For detailed design, refer to IS 2825 (Code for unfired pressure vessels) alongside IS 15682 for firefighting equipment context.

IS 15682 - Aerial Appliances: Key Specifications & Symbols

1. Aerial Appliances Categories (Clause 3.7)

• Cage carrying capacity: Defines load capacity of the cage.
• Turntable Ladder Controls:
  • Rotate clockwise / anti-clockwise
  • Extend / House ladder
  • Elevate / Depress ladder
  • Align ladder
• Hydraulic Platform Controls:
  • Rotate clockwise / anti-clockwise
  • Extend / House boom
  • Elevate / Depress boom
• Cage Rotation:
  • Rotate clockwise / anti-clockwise

2. Symbols

• Each function has a unique graphical symbol (refer to Clause 3.7 tables).
• Symbols help operators identify controls quickly for safety and efficiency.

3. Design Considerations

• Cage carrying capacity must comply with load safety factors.
• Movement controls (rotate, extend, elevate) must have smooth, reliable hydraulic or mechanical systems.
• Controls should be ergonomically placed and clearly marked using IS 15682 symbols.

Summary Table of Key Controls

Diagram: Control Flow for Turntable Ladder

graph TD
    A[Operator Control Panel] --> B(Rotate Ladder CW/ACW)
    A --> C(Extend Ladder)
    A --> D(Elevate/Depress Ladder)
    A --> E(Align Ladder)
    B --> F[Turntable Mechanism]
    C --> G[Ladder Extension Mechanism]
    D --> H[Ladder Elevation Mechanism]
    E --> I[Alignment Mechanism]

For detailed symbols and exact graphical representations, refer to Clause 3.7 of IS 15682. This standard ensures uniformity and safety in firefighting vehicle aerial appliance controls.

IS 15682 - Miscellaneous (Clause 3.8) Summary

This clause provides designation names and symbols for miscellaneous components in fire-fighting equipment, mainly non-electrical circuits and mechanical devices.

Key Notes:

• Symbols are mostly not specified except for Deflector positions:
  • Deflector (closed) = €
  • Deflector (open) = 1
• These designations help in standardizing schematic diagrams and equipment labeling.
• The clause does not provide formulas or numerical tables but focuses on symbol standardization.

Practical Use:

• Use these symbols in fire-fighting equipment schematics for clarity.
• Refer to other clauses (e.g., 3.1, 3.5) for related components like tanks, piping, and chassis.

flowchart LR
    A[Circuit (non-electrical)] --> B{Open / Closed}
    B --> C[Open]
    B --> D[Closed]
    E[Winch]

IS 15682: Legend and Symbol Scale - Key Points

Legend (Clause 2.3)

• All symbols used in drawings must be clearly defined in a legend.
• The legend should be directly understandable without ambiguity.

Symbol Scale (Clause 2.4)

• All symbols on a drawing must be to the same relative scale.
• Symbol sizes should be proportional to the drawing scale to maintain clarity and consistency.

Key Tables from IS 15682 (Examples)

Practical Tips for Symbol Scale

• If drawing scale = 1:100, and a symbol is 10 mm on paper, then at 1:50 scale, symbol should be 20 mm.
• Maintain uniform symbol size ratio across the entire drawing for readability.

Visual Concept (Mermaid.js)

flowchart LR
    A[Drawing Scale] --> B[Determine Symbol Size]
    B --> C{Maintain Relative Scale?}
    C -->|Yes| D[Apply Uniform Symbol Size]
    C -->|No| E[Redraw Symbols]
    D --> F[Add Legend with Symbol Definitions]

Summary:

• Define all symbols in a legend (Clause 2.3).
• Use consistent symbol sizing relative to drawing scale (Clause 2.4).
• Refer to IS 15682 tables for standard firefighting vehicle symbols.

IS 15682: Application and Usage Guidelines - Key Symbols & Tables

IS 15682 provides standardized symbols for fire-fighting equipment and controls, aiding consistent design and operation.

Key Tables and Symbols:

1. Miscellaneous Controls (Clause 3.8)

2. Tank and Piping (Clause 3.5)

3. Aerial Appliances (Clause 3.7)

4. Frame, Engine and Chassis (Clause 3.1)

Usage Guidelines:

• Use standardized symbols for clear communication in design, operation,