Functional requirements for 2000 kg dry powder tender for fire brigade use

IS 10993 - Scope: Key Specifications & Tables

Scope Summary: IS 10993 specifies requirements for fire fighting appliances (dry powder tenders) including equipment, vehicle performance, and vessel standards.

Key Specifications:

• Vehicle Mass & Performance (Clause 2.2):

  • Gross vehicle mass (with crew & equipment): ≥ 8500 kg
  • Max speed (fully laden): 72 km/h
  • Acceleration: 0 to 63 km/h in 55 seconds
  • Gradient start capability: 1 in 4
  • Braking distance at 48 km/h: ≤ 15 m
  • Hand brake hold on 1 in 4 gradient in neutral gear

• Dimensions:

  Parameter	Limit
  Wheel base	≤ 4500 mm
  Turning circle	≤ 20 m
  Road clearance	≥ 230 mm
  Overall width	≤ 2500 mm

• Equipment to be Carried (Appendix A, Clause 4.3.1):

  Item No.	Equipment	Quantity
  1	Fireman's axes (IS 926-1970)	2
  2	Axe, large (IS 5505-1969)	1
  3	Axe, hand (IS 5505-1969)	1
  4	Shovel (IS 274 Parts 1 & 2)	1
  5	Spare expellent gas cylinders (50 L each)	4

• Vessel Specification (Clause 4.4.1):

  • Cylinders must conform to IS 7285-1982 (seamless manganese steel cylinders for high-pressure gases).

Units & Definitions (SI Units):

IS 10993: General Requirements for 2000-kg Dry Powder Tender

Key Specifications (Clause 2.2):

• Gross Vehicle Mass (GVM): ≥ 8,500 kg (including crew, powder, equipment)
• Maximum Speed (fully laden): 72 km/h on level road
• Acceleration: From rest to 63 km/h in 55 seconds through gears
• Gradient Start Capability: Must start from rest on 1 in 4 gradient
• Braking:
  • Foot brake stops vehicle at 48 km/h within 15 m on dry level surface
  • Hand brake holds vehicle on 1 in 4 gradient in neutral gear
• Dimensions:

Equipment Schedule (Appendix A, Clause 4.3.1):

Important Units (SI):

This ensures the tender meets operational and safety criteria for fire brigade use.

IS 10993: Material Selection and Treatment – Key Points

1. Material Requirements (Clauses 3.3 & 5.2)

• Metal parts exposed to atmosphere or in contact with powder:
  • Use corrosion-resistant materials (e.g., stainless steel, galvanized steel).
  • Or apply suitable corrosion-resistant treatments (e.g., painting, powder coating, anodizing).

2. Design Considerations (Clause 2.3)

• Towing arrangement must support a 1-tonne trailer.
• Maintain low center of gravity for stability.
• Overall height must comply with permissible limits.

3. Treatment Methods

• Surface treatments may include:
  • Galvanization
  • Epoxy or powder coatings
  • Anodizing (for aluminum)
  • Use of corrosion inhibitors

4. Reference Table (Appendix A - Equipment)

While not directly material-related, Appendix A lists equipment standards (e.g., IS 926-1970 for fireman’s axes), indicating the importance of standardized, durable materials for safety equipment.

Summary Table: Material Selection Criteria

Additional Notes

• Follow IS codes for specific equipment materials.
• Ensure all metallic surfaces in contact with powder are protected to prevent contamination and corrosion.

flowchart TD
    A[Metal Parts] --> B{Exposure}
    B -->|Atmosphere| C[Corrosion-resistant Material or Treatment]
    B -->|Contact with Powder| C
    C --> D[Stainless Steel / Galvanized / Coated]
    D --> E[Ensure Strength & Durability]

Use corrosion-resistant materials or apply protective treatments to ensure longevity and safety in fire-fighting appliances as per IS 10993.

IS 10993: Design and Construction Key Points

General Requirements (Clause 2.2)

• Gross Vehicle Mass: ≥ 8,500 kg (including crew, powder, equipment)
• Max Speed (fully laden): 72 km/h on level road
• Acceleration: 0 to 63 km/h in 55 seconds (fully laden)
• Gradient Start Capability: 1 in 4 (25%)
• Braking:
  • Foot brake stops vehicle within 15 m at 48 km/h on dry level surface
  • Hand brake holds vehicle on 1 in 4 gradient in neutral gear
• Dimensions:

Vessel Specifications (Clause 4.4.1)

• Cylinders must conform to IS: 7285-1982 for seamless manganese steel cylinders.
• Thickness tolerance updated to 0.012 mm.
• Maximum weight for certain components revised to 2.5 kg.

Material Specification (Clause 3.4)

• No ferrous metal for chromium-plated fittings.
• Chromium plating must be extra-heavy quality.

Summary Diagram of Key Dimensions and Performance

graph TD
A[Fire Appliance Design] --> B[Mass ≥ 8,500 kg]
A --> C[Max Speed 72 km/h]
A --> D[Acceleration 0-63 km/h in 55s]
A --> E[Start on 1:4 Gradient]
A --> F[Braking: 15 m @ 48 km/h]
A --> G[Hand Brake Holds on 1:4 Gradient]
A --> H[Dimensions]
H --> H1[Wheelbase ≤ 4500 mm]
H --> H2[Turning Circle ≤ 20 m]
H --> H3[Road Clearance ≥ 230 mm]
H --> H4[Width ≤ 2500 mm]

Use IS 7285-1982 for cylinder design and IS 926 & 5505 for axes specifications.

IS 10993: Engine Requirements for Fire Brigade Dry Powder Tender

Key Specifications (Clause 2.2 & 4.1.1):

• Gross Vehicle Mass: ≥ 8,500 kg (including crew, powder, equipment)

• Max Speed (fully laden): 72 km/h on level road

• Acceleration: 0 to 63 km/h in 55 seconds through gears

• Gradient Start: Capable of starting from rest on 1 in 4 gradient

• Braking:

  • Foot brake stops vehicle within 15 m from 48 km/h on dry level surface
  • Hand brake holds vehicle on 1 in 4 gradient in neutral gear

• Dimensions:

  Parameter	Limit
  Wheelbase	≤ 4,500 mm
  Turning Circle	≤ 20 m
  Road Clearance	≥ 230 mm
  Overall Width	≤ 2,500 mm

• Engine Type: Compression ignition (diesel), reliable quick start even in cold conditions.

Important Notes:

• Engine must start immediately without warm-up.
• Braking performance and gradient capability ensure safety and operational efficiency.

Summary Table:

flowchart TD
    A[Engine Requirements] --> B[Compression Ignition Type]
    A --> C[Start on 1 in 4 Gradient]
    A --> D[Max Speed 72 km/h]
    A --> E[Acceleration 0-63 km/h in 55s]
    A --> F[Braking: Foot

IS 10993: Electrical System - Key Specifications & Formulas

Clause 4.2: Electrical System Requirements

• All important electrical circuits must have separate fuses.
• Fuses grouped in a common fuse-box located in the driver's cab, accessible and with spare fuses.
• Wiring must be single-pole, not exposed to atmosphere.
• Use conduits where necessary for protection.

Important Electrical Units & Definitions (from IS 10993 Appendix)

Fuse-Box & Wiring Guidelines (Clause 4.2.2)

• Fuse-box location: Driver’s cab, easily accessible.
• Fuse type: Separate for each important circuit.
• Wiring: Single-pole, enclosed in conduits or protected from weather.

Summary Diagram: Electrical Circuit Protection Setup

graph LR
A[Power Source] --> B[Fuse Box]
B --> C1[Lighting Circuit (Fuse 1)]
B --> C2[Communication Circuit (Fuse 2)]
B --> C3[Pump Control Circuit (Fuse 3)]
C1 --> D1[Protected Wiring - Single Pole]
C2 --> D2[Protected Wiring - Single Pole]
C3 --> D3[Protected Wiring - Single Pole]

Note: For detailed electrical load calculations, use standard electrical engineering formulas:

[ I = \frac{P}{V \times \text{Power Factor}} \quad \text{where } I = \text{current (A)}, P = \text{power (W)}, V = \text{voltage (V)} ]

This summary aligns with IS 10993 clauses and standard electrical safety practices for

IS 10993 Key Specifications: Body and Accommodation

1. Body Accommodation (Clause 4.3.1)

• Enclosed cabin for 2 persons + driver with independent seats.
• Two doors: one on each side, hinged at front, opening outwards.
• Doors equipped with double-catch striking plates.
• Rear body accommodates dry powder vessels and equipment (see Appendix A).
• Rear flooring preferably with light alloy chequered plates.

2. Additional Riding Position (Clause 4.3.2)

• Platform at rear for 2 persons.
• Equipped with grab rails and non-skid steps for safe mounting/dismounting.

3. General Vehicle Dimensions & Performance (Clause 2.2)

4. Equipment (Appendix A, Clause 4.3.1)

Summary Diagram: Body Accommodation Layout

graph LR
    A[Driver Seat] --> B[Passenger Seat 1]
    B --> C

IS 10993 - Dry Powder Fire Extinguishing Equipment (Clause 4.4 Key Points)

• Capacity: 2,000 kg dry powder (foam compatible, IS:4308-1982) stored in either:

  • Single vessel (2,000 kg), or
  • Two vessels (1,000 kg each) with separate filling, drain, safety valve, pressure gauge, isolation & discharge valves.

• Expellent Gas: Nitrogen, with separate supply & pressure reduction valve per vessel.

• Discharge: Powder expelled through:

  • 2 hose reels with trigger-type pistol grip nozzles, and/or
  • Long-range monitor on top of appliance.

• Vessel Internal Protection: Anti-corrosion coating:

  • Lead-tin alloy (≥10% tin, min 0.12 mm thick), or
  • Epoxy paint.

• Operational Notes:

  • Flushing unit after use is essential.
  • Powder safe for electrical fires but clean machinery after use.
  • Revised minimum powder quantity per line (Clause 2.5): 2.5 kg (not 5 kg).

Typical Vessel Setup (Two Vessel System)

flowchart LR
    subgraph Vessel 1
      F1[Filling Aperture]
      SV1[Safety Valve]
      PG1[Pressure Gauge]
      IV1[Isolation Valve]
      DV1[Discharge Valve]
    end
    subgraph Vessel 2
      F2[Filling Aperture]
      SV2[Safety Valve]
      PG2[Pressure Gauge]
      IV2[Isolation Valve]
      DV2[Discharge Valve]
    end
    F1 --> SV1 --> PG1 --> IV1 --> DV1 --> Manifold
    F2 --> SV2 --> PG2 --> IV2 --> DV2 --> Manifold
    Manifold --> HoseReels[2 Hose Reels + Monitor]

Summary Table: Vessel Requirements

IS 10993 - Control Panel Specifications (Clause 4.5)

The control panel for dry powder fire extinguishing systems must be:

• Adequately illuminated and easily accessible.
• All controls/items clearly marked with labels for easy operation.

Required Components (Clause 4.5.2):

Additional Notes:

• Pressure gauges should comply with standard pressure measurement units (Pascal, bar).
• Operating levers must be ergonomically placed for quick response.
• Instruction plate must include a clear line diagram for operation guidance.

Summary Diagram of Control Panel Components:

graph TD
  A[Control Panel]
  A --> B[Pressure Gauge - Gas Cylinders]
  A --> C[Pressure Gauge - Operating Pressure]
  A --> D[Operating Levers]
  D --> D1[Expellent Gas Valve]
  D --> D2[Monitor Valve]
  D --> D3[Hose-Reel Valves]
  D --> D4[Pressure Release Valve]
  D --> D5[Flushing Valve - Monitor]
  D --> D6[Flushing Valves - Hose-Reels]
  A --> E[Lighting Switches]
  A --> F[Instruction Plate with Line Diagram]

Ensure all components conform to IS standards and are tested for reliability and safety.

Stability Requirements (IS 10993 - Clause 4.6)

• The appliance must remain stable under fully equipped and loaded conditions (excluding crew).
• When the surface tilts to either side, overturning must not occur before a tilt angle of 25° from horizontal.

Key Specification:

Stability Concept:

• The center of gravity (CG) and base width govern stability.
• Overturning occurs when the line of action of weight falls outside the base.
• Stability angle (θ) relates to base half-width (b) and height of CG (h):

[ \tan \theta = \frac{b}{h} ]

For stability at 25°:

[ \theta = 25^\circ \Rightarrow \tan 25^\circ = 0.466 ]

So,

[ \frac{b}{h} \geq 0.466 ]

Practical Design Implications:

• Ensure low CG height (h).
• Provide sufficient base width (2b).
• Confirm stability by testing or calculation that overturning angle ≥ 25°.

graph LR
A[Base Width (2b)] -- Half base --> B[b]
C[Center of Gravity Height (h)] --> D[Height from base]
E[Stability Angle θ] --> F[tan θ = b/h]
G[Overturning occurs if θ < 25°] --> H[Design to keep θ ≥ 25°]

Summary:
Design and verify appliance so that under full load (excluding crew), it resists overturning up to a 25° tilt, ensuring safety and compliance with IS 10993.

IS 10993: Workmanship and Finish - Key Points

• Clause 5.1: All parts must exhibit good workmanship and have a streamlined finish to ensure durability and aesthetic quality.

• Clause 3.4: For chromium-plated fittings, ferrous metal is prohibited. Plating must be extra-heavy quality to resist corrosion.

• Stability Requirement (Clause 4.6): Appliance must not overturn when tilted up to 25° from horizontal under fully equipped and loaded conditions (excluding crew).

Summary Table: Workmanship and Finish Requirements

Stability Check Formula (from Clause 4.6):

[ \theta_{overturn} \geq 25^\circ ]

Where (\theta_{overturn}) = tilt angle at which appliance overturns.

Notes:

• Good workmanship ensures safety, longevity, and ease of maintenance.
• Extra-heavy chrome plating improves corrosion resistance.
• Stability angle ensures safe operation on inclined surfaces.

graph LR
A[Good Workmanship] --> B[Streamlined Finish]
A --> C[Durability]
D[Material] --> E[Non-Ferrous Metals for Chrome]
E --> F[Extra-Heavy Chrome Plating]
G[Stability] --> H[Tilt Angle ≥ 25°]

For detailed equipment specs, refer to Appendix A of IS 10993.

IS 10993 Key Specifications for Instruction Book(s), Accessories, and Equipment

1. Instruction Book(s) (Clause 6.1)

• Must include operating and normal maintenance procedures.
• Provide an itemized and illustrated spare parts list with reference numbers for all wearing parts.

2. Painting (Clause 5.3)

• Appliance painted fire-red, Shade No. 536 of IS:5-1978.
• Paint to conform to IS:2932-1974.

3. Equipment to be Carried (Clause 6.3 & Appendix A)

4. Relevant IS Codes for Accessories

• Fireman's axe: IS 926-1970
• Axes: IS 5505-1969
• Shovel: IS 274 (Parts 1 & 2) - 1981

Summary Diagram: Equipment & Documentation Flow

flowchart TD
    A[Instruction Book(s)]
    B[Operating Procedures]
    C[Maintenance Procedures]
    D[Spare Parts List]
    E[Equipment List]
    F[Fireman's Axes]
    G[Axes]
    H[Shovel]
    I[Gas Cylinders]

    A --> B
    A --> C
    A --> D
    E --> F
    E --> G
    E --> H
    E --> I

Note: Ensure all equipment complies with the respective IS specifications for safety and interoperability.

IS 10993 - Marking Specifications (Clause 7.1):

Each fire appliance must be clearly and permanently marked with:

• Manufacturer's name or trade-mark
• Year of manufacture

Additional Relevant Details from IS 10993:

• Equipment Marking: Fireman's axes, shovels, and gas cylinders must conform to respective IS standards (e.g., IS 926-1970 for axes, IS 274 for shovels).
• Cylinder Specification: Gas vessels must conform to IS 7285-1982 for seamless manganese steel cylinders.
• Dimensions & Performance:

Summary Diagram of Marking:

graph TD
    A[Fire Appliance] --> B[Marking]
    B --> C[Manufacturer's Name/Trade-mark]
    B --> D[Year of Manufacture]

This ensures traceability and compliance with safety and manufacturing standards.

IS 10993: Schedule of Equipment to be Carried on the Appliance

Key Specifications (Clause 4.3.1, Appendix A):

Additional Equipment Requirements (Clause 6.2):

• Electrically operated siren (1 km range, driver cab switch)
• Two fog lamps
• Reversing light
• Two airfield obstruction marking lights (front & rear)
• Blue revolving beacon light (360° coverage)
• Search light with tripod and ≥30 m TRS cable (max 2 V voltage drop)
• Spot light (rear side of driver’s cab)
• Inspection lamp with plug socket on control panel
• Routine maintenance tools (beyond chassis kit)

Vehicle Performance Parameters (Clause 2.2):

• Gross Vehicle Mass: ≥ 8,500 kg (including crew, powder, equipment)
• Max Speed (fully laden): 72 km/h
• Acceleration: 0 to 63 km/h in 55 seconds
• Gradient Start Capability: 1 in 4
• Braking Distance: ≤ 15 m from 48 km/h on dry level surface
• Hand Brake Holding: On 1 in 4 gradient in neutral

Dimensions:

This schedule ensures the appliance is fully equipped for firefighting operations with mandated tools and performance standards.