Functional Requirements for Water Tender, Type B for Fire Brigade Use

IS 950: Scope & Key Specifications for Water Tender Fire Appliance

Scope Summary (Clause 3.2 & 7.2.1)

• Gross Vehicle Weight: ≥ 16,000 kg (including crew, water, equipment)
• Max Speed (fully laden): 72 km/h on level road
• Acceleration: 0 to 64 km/h in 55 s (through gears, fully laden)
• Gradient Start Capability: 1 in 4 slope from rest
• Braking: Stops within 15 m at 48 km/h; hand brake holds on 1 in 4 slope
• Overall Dimensions:
  • Wheelbase: ≤ 4,500 mm
  • Turning Circle: ≤ 20 m
  • Road Clearance: ≥ 230 mm
  • Width: ≤ 2.50 m

Mandatory Accessories (Clause 7.2.1)

Marking Requirements on Appliance

• Manufacturer's name/trademark
• Serial number & year of construction
• Pump capacity (l/min)
• Water tank capacity (litre)
• Nominal speed (rev/min)
• Transmission ratio of pump gear
• Working pressure (kg/cm²)
• Direction of pump rotation (arrow)
• Colour-coded lubrication & drainage points

Rounding Off (Clause None)

• Follow IS 2:1960

IS 950: Referenced Indian Standards Summary

The standard references several IS codes relevant to fire fighting equipment accessories and materials. Key points:

Accessories (Clause 7.2.1)

• Fire bell: 250 mm diameter, hand-operated from driving compartment.
• Lighting: 2 head lamps, 2 fog lamps, reversing light, amber blinkers, tail lamps (combined stop & tail).
• Other: Siren (battery operated), search light with tripod and ≥30 m cable, spot light, inspection lamp with plug socket.
• Tools: All routine maintenance tools not included in chassis kit.
• Markings: Manufacturer, serial no., pump capacity (l/min), water tank capacity (litre), pump speed (rev/min), transmission ratio, working pressure (kg/cm²), rotation direction, lubrication points color-coded.

Key Referenced IS Codes (Annex A)

IS 950 - General Requirements Summary (Clause 3)

Key Specifications for Water Tender Fabrication:

• Gross Vehicle Weight: ≥ 16,000 kg (including crew, water, equipment)
• Max Speed (Fully Laden): 72 km/h on level road
• Acceleration: 0 to 64 km/h in 55 seconds (through gears, fully laden)
• Gradient Start Capability: Must start from rest on 1 in 4 gradient
• 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:

Accessories (Clause 7.2.1):

• Fire bell (250 mm diameter, hand operated)
• Head lamps (2), Fog lamps (2), Reversing light
• Amber blinker lights, Trafficators with indicators
• Windscreen wipers, tools for maintenance
• Siren (battery operated), Search light with tripod & 30 m cable
• Spot light, Inspection lamp with control panel socket
• Tail lamps (2 combined stop/tail), Rear reflectors
• Cab and instrument panel lights, Public address system

Marking Requirements:

• Manufacturer name/trademark
• Pump body serial number & year
• Pump capacity (l/min), water tank capacity (litre)
• Pump nominal speed (rev/min), transmission ratio
• Working pressure (kg/cm²), pump rotation direction (arrow)
• Color-coded lubrication points and drainage devices

Rounding Off:
Follow IS 2:1960 for rounding numerical values to match significant figures of specified values.

flowchart TD
    A[Water Tender Fabrication] --> B[Weight ≥ 16,000 kg]
    A --> C[Speed 72 km/h max]
    A --> D[Start on 1 in 4 gradient]
    A --> E[Braking: 15 m stop @48 km/h]
    A --> F[Dimensions]
    F --> F

IS 950: Key Materials Specifications & Tables

1. Material Selection (Clause 4.1)

2. Superstructure (Clause 5.11.4.1)

• Superstructure made from 2 mm mild steel pressed Top Hat sections.
• Strengthened with brackets and gussets of 2 mm mild steel plate.

3. Marking Requirements

• Manufacturer name/trademark
• Serial number & year
• Pump capacity (l/min)
• Water tank capacity (litres)
• Nominal speed (rev/min)
• Transmission ratio
• Working pressure (kg/cm²)
• Direction of rotation (arrow)
• Lubrication points & drainage devices (color-coded)

Additional Notes:

• Materials chosen balance lightness, strength, and durability.
• Refer to respective IS codes (IS 318, IS 617, IS 6603, IS 737, IS 513) for detailed material properties.
• Rounding of numerical values per IS 2:1960.

flowchart TD
    A[Pump Components] --> B[Pump casing & low-pressure impeller]
    B -->|Material| C[Lead tin bronze (IS 318)]
    A

IS 950: Key Formulas, Tables & Specifications for Design and Construction

1. Material Selection (Clause 4.1)

2. Superstructure (Clause 5.11.4.1)

• Superstructure made from 2 mm mild steel pressed 'Top Hat' sections.
• Strengthened with 2 mm mild steel brackets and gussets at locker door frames.

3. Accessories (Clause 7.2.1)

• Fire bell (250 mm diameter, hand-operated)
• Head lamps (2), fog lamps (2), reversing light
• Amber blinkers, trafficators with indicator lights
• Windscreen wipers, tools for maintenance
• Siren (battery operated), search light with tripod & 30 m TRS cable
• Spot light, inspection lamp with control panel socket
• Tail lamps (2 combined stop/tail), rear reflectors
• Cab, instrument panel & locker lights
• Public address system

4. Marking Requirements

Each appliance must be permanently marked with:

• Manufacturer's name/trademark
• Serial number &

Workmanship and Finish - IS 950 Key Points

Clause 6.1: Workmanship

• All parts must exhibit good workmanship.
• Surfaces should have a streamlined finish to avoid roughness or defects.

Stability (Clause 5.19)

• Appliance stability must ensure no overturning occurs before a 30° tilt from horizontal under fully equipped and loaded conditions (excluding crew).

Markings (Clause 7.2)

• Permanent markings on the appliance must include:
  • Manufacturer's name/trademark
  • Serial number and year of construction
  • Pump capacity (l/min)
  • Water tank capacity (litres)
  • Nominal speed (rev/min)
  • Transmission ratio of pump gear
  • Working pressure (kg/cm²)
  • Direction of pump rotation (arrow)
  • Color-coded lubrication points and drainage devices

Rounding Off (IS 2:1960)

• Test/analysis results must be rounded off per IS 2 rules, retaining the same significant figures as specified values.

Summary Table: Workmanship & Finish Requirements

Visual: Stability Concept

graph LR
A[Appliance at rest] --> B[Tilt to side]
B --> C{Tilt angle < 30°?}
C -- Yes --> D[Stable, no overturn]
C -- No --> E[Overturning occurs]

References:

• IS 950: Clause 5.19, 6.1, 7.2
• IS 2:1960 for rounding rules

IS 950: Instruction Book, Accessories, and Equipment

Instruction Book (Clause 7.1)

• Must include operating and normal maintenance procedures.
• Should have an itemized, illustrated spare parts list with reference numbers for all wearing parts.
• Purpose: Guide users for safe and effective appliance use.

Paint Specification (Clause 6.2)

• Appliance painted fire red, Shade No. 536 (IS 5).
• Paint to conform to IS 2932.

Accessories and Equipment (Clause 7.2 & Annex B)

• Accessories not part of the appliance but assist operation.
• Annex B lists typical accessories for guidance (e.g., hoses, nozzles, spanners).
• Accessories should be compatible and recommended by the manufacturer.

Summary Table

flowchart LR
    A[Instruction Book] --> B[Operating Procedures]
    A --> C[Maintenance Procedures]
    A --> D[Spare Parts List]
    E[Accessories] --> F[Hoses]
    E --> G[Nozzles]
    E --> H[Spanners]

For detailed accessory lists, refer to Annex B of IS 950.

IS 950: Marking - Key Specifications & Tables

Marking Requirements (Clause 7.2.1 & 22.5):

Each fire appliance shall be clearly and permanently marked with:

• Manufacturer's name/trademark
• Serial number and year of pump construction
• Pump capacity (l/min)
• Water tank capacity (litre)
• Nominal speed (rev/min)
• Transmission ratio of pump gear
• Working pressure (kg/cm²)
• Direction of pump rotation (arrow on pump body)
• Colour-coded lubrication points and drainage devices

Accessories & Equipment (from Clause 22.5 & 7.2.1 Tables)

Hose & Coupling Specifications

• Delivery hose lengths: 15 m or 22.5 m fitted with 63 mm delivery hose couplings.
• Hose clamps and bandages: As per IS 5612 (Parts 1 & 2).
• Unlined flax canvas hose: 30 m length, IS 4927.

Summary Diagram: Marking & Equipment Flow

graph TD
  A[Fire Appliance] --> B[Marking]
  B --> B1[Manufacturer Name]
  B

IS 950: Testing and Performance Requirements Summary

Key Performance Specifications (Clause 3.2)

• Gross Vehicle Weight: ≥ 16,000 kg (including crew, water, equipment)
• Max Speed (fully laden): 72 km/h on level road
• Acceleration: 0 to 64 km/h in 55 s (fully laden)
• Gradient Start Capability: Must start on 1 in 4 gradient from rest
• Braking:
  • Foot brake stops vehicle within 15 m from 48 km/h on dry 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	≤ 2.50 m

Accessories (Clause 7.2.1)

• Fire bell (250 mm diameter, hand-operated)
• Head lamps, fog lamps, reversing light
• Amber blinkers, trafficators, windscreen wipers
• Tools for routine maintenance
• Siren (battery operated)
• Search light with tripod and 30 m cable
• Spot light, inspection lamp
• Tail lamps, rear reflectors
• Public address system

Markings on Appliance

• Manufacturer name/trademark
• Serial number, year of construction
• Pump capacity (l/min), water tank capacity (litre)
• Nominal pump speed (rev/min), transmission ratio
• Working pressure (kg/cm²)
• Direction of pump rotation arrow
• Color-coded lubrication and drainage points

Rounding Off (per IS 2:1960)

• Final test values rounded to same significant figures as specified values.

Useful Formula for Braking Distance (not explicitly in IS 950 but standard practice):

[ d = \frac{v^2}{2 \mu g} ]

Where:

• (d) = stopping distance (m)
• (v) = velocity (m/s)
• (\mu) = coefficient of friction (typ. 0.7 for dry asphalt)
• (g) = acceleration due to gravity (9.81 m/s²)

IS 950: Electrical System Key Points

1. Electrical Circuits (Clause 5.2.2)

• Separate fuses for all important circuits.
• Fuses grouped in a common fuse box in driver's cab.
• Fuse box must have spare fuse holder.
• Wiring: single pole, protected from atmosphere.
• Use conduits where necessary for protection.

2. Alternator Unit (Clause 5.16)

• Alternator specifications ensure reliable power generation.
• Must comply with rated voltage and current as per design.

3. Portable Electrical Equipment (Clause 2.5)

• Portable electric box lamp with rechargeable battery.
• Hand lamp (torch) with 4 cells.
• Flameproof lamp for hazardous atmospheres.
• Accessories: suction hoses, couplings, suction wrenches (see IS 902, IS 904, IS 4643).

Typical Fuse Box Setup

graph LR
A[Electrical Circuits] --> B[Fuse Box]
B --> C[Separate Fuses]
B --> D[Spare Fuse Holder]
A --> E[Single Pole Wiring]
E --> F[Conduits Protection]

For detailed electrical component dimensions and ratings, refer to respective IS codes mentioned for accessories and fittings.

IS 950: Pump and Pipeline Specifications Summary

Pump Capacities (Clause 3.5)

• Option a: 2,000 L/min @ 0.7 MPa + 300 L/min @ 3.5 MPa
• Option b: 3,000 L/min @ 0.7 MPa + 300 L/min @ 3.5 MPa
• Option c: 4,000 L/min @ 0.7 MPa + 300 L/min @ 3.5 MPa

Key Design Requirements

• Normal and high-pressure stages operate simultaneously.
• Changeover between pressures via simple mechanism (preferably single lever).
• Normal pressure ≤ ¼ of high pressure at any pump speed.
• Thermal Relief Valve (TRV) on discharge to keep water temperature < 48°C (or 80°C if justified).
• TRV discharge routed to tank or safely away via metallic pipe.
• Provision for hose reel and cooling water line connections on pump housing.
• Performance tested with strainers at 27 ± 5°C.

Pump Performance Table (Clause 5.5.3)

Pipelines and Valves (Clause 5.8)

• Follow standard pipeline design for pressure and flow.
• Use metallic pipes for TRV discharge.
• Valves must ensure reliable flow control and safety.

Primer (Clause 5.7.3)

• Gun metal/light alloy body.
• Stainless steel shaft.
• Lubricated bearings.

Important Formula: Pressure-Flow Relation

[ Q = A \times v ]

Where:

• (Q) = flow rate (L/min)
• (A) = cross-sectional area of pipe (m²)
• (v) = velocity of water (m/s)

flowchart LR
    Pump -->|Normal Pressure| HoseReel
    Pump -->|High Pressure| HoseReel
    Pump --> TRV
    TRV -->|

IS 950: Crew Cabin and Seating Key Specifications

1. Crew Cabin Accommodation (Clause 5.11.1.1)

• Enclosed accommodation for 6 persons: driver + in-charge + 4 crew.
• Driver's seat: Independent & adjustable.
• Rear compartment: One removable full-width seat for 5 crew members.
• Floor: Covered with 3 mm thick aluminium chequered plate, fixed by nuts/bolts or riveting.
• Trap doors for maintenance access.

2. Crew Seating (Clause 5.11.2.3)

• Crew seat: Rigidly fixed to floor, full vehicle width.
• Seating for 5 firemen.
• Cushion: 75 mm × 50 mm latex foam rubber, upholstered with quality foam leather.

3. Cabin Superstructure (Clause 5.11.4.1)

• Constructed from 2 mm mild steel pressed 'Top Hat' sections.
• Strengthened with brackets and gussets (2 mm mild steel plate).

4. Doors (Clause 5.11.1.3)

• 4 doors: 1 driver, 1 officer, 2 crew.
• Doors hung on 3 invisible coach-type mild steel hinges.
• Fitted with high-quality handles.
• Sized for easy crew embark/disembark.

Summary Diagram: Crew Cabin Layout

graph LR
    Driver -->|Adjustable Seat| DriverSeat
    Officer -->|Independent Seat| OfficerSeat
    Crew -->|Removable Full-width Seat| CrewSeat
    Floor -->|3mm Aluminium Plate| FloorCovering
    Superstructure -->|Steel Sections| Frame
    Doors -->|4 Doors| CabinAccess

This ensures ergonomic, safe, and durable

IS 950: Storage Lockers and Equipment Stowage - Key Specifications

• Locker Dimensions (Clause 5.11.4.7):

  • Minimum height (bottom to top of opening): 600 mm
  • Minimum depth: 600 mm

• Locker Location & Purpose (Clauses 5.11.2.2 & 5.11.2.4):

  • Two lockers below crew seat:
    • One for battery box (to fit two 12 V, 13 plates batteries)
    • One for accessories
  • Extra battery cable length to be provided as required.

• Lighting (Clause 5.11.4.7):

  • Internal automatic lighting in all lockers
  • Master switch located in the cab

Practical Notes:

• Battery locker size should accommodate standard 12 V, 13 plates batteries (approx. 300 mm x 175 mm x 225 mm per battery).
• Ensure ventilation in battery lockers for safety.
• Accessories locker size can vary but maintain minimum dimensions.

flowchart TB
    A[Crew Seat] --> B[Battery Locker]
    A --> C[Accessories Locker]
    B --> D[Two 12V, 13 Plates Batteries]
    B --> E[Extra Battery Cable Length]
    B & C --> F[Internal Automatic Lighting]
    F --> G[Master Switch in Cab]

This ensures secure, accessible, and safe storage per IS 950.

Safety and Stability Key Points from IS 950

Stability Requirement (Clause 5.19):

• The appliance must not overturn when tilted up to 30° from the horizontal under fully equipped and loaded conditions (excluding crew).

Key Specifications (Clause 3.2)

Stability Check Formula (Conceptual)

To ensure stability against overturning:

[ \tan \theta_{critical} = \frac{b/2}{h_{cg}} ]

• (b) = track width (distance between wheels)
• (h_{cg}) = height of center of gravity
• (\theta_{critical}) = max tilt angle before overturning (≥ 30° as per IS 950)

Design must ensure:

[ \theta_{critical} \geq 30^\circ ]

Summary Diagram (Stability Concept)

graph LR
A[Base Width (b)] --> B[Center of Gravity Height (h_cg)]
B --> C{Calculate Critical Tilt Angle}
C --> D[Ensure \theta_{critical} ≥ 30°]

Additional Notes:

• Safety devices like pressure relief valves must be installed per Clause 7.1.2.
• Accessories and markings are specified under Clause 7.2.1 for operational safety and identification.

This ensures the fire tender is stable, safe, and compliant with IS 950.

IS 950: Installation and Assembly Instructions - Key Points

1. Installation Handbook Contents (Clause 7.1.2)

• Risk Assessment: Installer/fabricator must perform a complete risk assessment for the fire tender.
• Initial Installation: Step-by-step initial installation instructions.
• Site Data: Include space for operation/maintenance, base/foundation details, and inspection before installation.
• Pump Assembly: Installation of pump, safety devices, control systems, pressure/thermal relief valves.
• Safety Devices: Adjustable safety devices must be enclosed and accessible only with tools.

2. Instruction Book Requirements (Clause 7.1 & 7.1.1)

• Pump Description: General description, operating temperature range, design, function, max pressure, controls.
• Safety Devices: Design and use.
• Accessories: Description and installation.
• Diagrams: Cross-sectional or exploded views.
• Markings: Manufacturer info, pump capacity, speed, pressure, rotation direction, lubrication points (color-coded).

3. Accessories (Clause 7.2.1)

• Fire bells (250 mm), head/fog lamps, reversing light, blinkers, trafficators, wipers, siren, searchlight, spot light, inspection lamp, tail lamps, reflectors, PA system.

Summary Table: Installation Checklist

Diagram: Installation Flow

flowchart TD
    A[Start: Risk Assessment] --> B[Site Inspection]
    B --> C[Prepare Base/Foundation]
    C --> D[Install Pump Assembly]
    D --> E[Install Safety Devices]
    E --> F[Install Pressure Relief Valves]
    F --> G[Check Controls & Accessories]
    G --> H[Final Inspection & Testing]
    H --> I[Operation & Maintenance Instructions]

Note: For detailed specifications and