mobile library van

IS 2661: Scope Overview

IS 2661 covers specifications for materials and construction related to vehicle bodies, particularly focusing on:

• Materials:

  • Timber: Must conform to relevant IS standards (e.g., IS 2179-1962 for trailer timber) with a minimum density of 720 kg/m³.
  • Metals: Specifications for wrought aluminium/alloys, hot-rolled and cold-rolled carbon steel sheets, and phosphate treatments for corrosion protection.

• Construction Requirements:

  • Provision of grab rails and two heavy steps with non-skid treads near entrances (Clause 7.4.1).

Key Points:

Summary Diagram:

graph TD
  A[IS 2661 Scope] --> B[Materials]
  B --> C[Timber (IS 2179-1962, density ≥ 720 kg/m³)]
  B --> D[Aluminium (Wrought bars, rods, sheets)]
  B --> E[Steel (Hot & Cold Rolled Sheets)]
  A --> F[Construction]
  F --> G[Grab Rails & Heavy Steps with Non-Skid Treads]

This standard ensures durability, safety, and corrosion resistance in vehicle body construction.

IS 2661 - Definitions & Key Specifications Summary

• Timber for Construction:

  • Must conform to IS: 2179-1962 (Specification for timber for lorry bodies).
  • Minimum density: 720 kg/m³.

• Materials:

  • Hot rolled carbon steel sheets & strips: As per relevant Indian Standards (third revision).
  • Cold rolled carbon steel sheets: As per relevant Indian Standards (second revision).
  • Phosphate treatment for corrosion protection on iron and steel.
  • Aluminium and aluminium alloys (bars, rods, sheets, strips) per IS standards (second revision).

• Safety Features:

  • Grab rails and two heavy steps with non-skid treads near entrance (Clause 7.4.1).

Important Notes:

This ensures materials meet structural integrity and safety for vehicle body construction under IS 2661.

IS 2661: General Requirements - Key Points

• Grab Rails & Steps (Clause 7.4.1):

  • Provide necessary grab rails near the entrance.
  • Include two heavy steps in the step-well with non-skid treads for safety.

• Materials (Clause 6.2 & 6.4):

  • Timber: Minimum density 720 kg/m³, conforming to IS 2179-1962 for trailers.
  • Aluminium: Use wrought aluminium/alloys per relevant IS specifications (second revision).
  • Steel: Hot-rolled and cold-rolled carbon steel sheets must comply with respective IS standards.
  • Corrosion Protection: Apply phosphate treatment as per IS for iron and steel.

Summary Table of Material Specifications

flowchart LR
    A[Entrance] --> B[Grab Rails]
    A --> C[Two Heavy Steps]
    C --> D[Non-Skid Treads]
    E[Materials] --> F[Timber (IS 2179)]
    E --> G[Aluminium (Wrought IS)]
    E --> H[Steel (Hot & Cold Rolled IS)]
    E --> I[Phosphate Treatment]

This ensures safety, durability, and compliance with IS 2661 general requirements.

IS 2661: General Layout and Planning for Mobile Libraries

Key Specifications:

• Objective: Maximize book storage while ensuring accessibility and multi-language collection (Clause 3.2).
• Dimensions & Layout: Basic dimensional requirements for interiors to optimize space (Clause 1.1).
• Construction Materials: Must comply with relevant IS standards (Clause 6.4).
• Typical Layout: Refer to Fig. 1 (Clause 4.1) for standard interior arrangement.

General Layout Guidelines:

• Shelving: Use adjustable, compact shelves to maximize book capacity.
• Aisle Width: Minimum 600 mm for comfortable movement.
• Storage Capacity: Design shelves to hold books in multiple languages, ensuring clear labeling.
• Seating/Reading Area: Allocate minimal space for reader comfort without compromising storage.

Example Formula for Book Capacity Estimation:

[ \text{Total Books} = \frac{\text{Shelf Length (m)} \times \text{Shelf Height (m)} \times \text{Shelf Depth (m)}}{\text{Average Book Volume (m}^3\text{)}} ]

• Typical average book volume ≈ 0.002 m³ (20 cm × 13 cm × 7.5 cm).

Summary Table: Typical Dimensions

flowchart LR
    A[Mobile Library Interior] --> B[Shelving Units]
    A --> C[Aisle Space]
    A --> D[Reading/Service Area]
    B --> E[Multi-language Books]
    B --> F[Compact Adjustable Shelves]
    C --> G[Min 600 mm Width]

This layout ensures maximum book capacity with user-friendly access, aligning with IS 2661 guidelines.

IS 2661 Key Specifications: Dimensions and Weight

• Payload Weight (Clause 5.4):
  [ \text{Payload} \geq (n + 500) \text{ kg} ]
  where n = number of books.

• Internal Length (Clause 5.3):
  [ \text{Internal length} \leq 6.5 \text{ m} ]
  Note: Consider bridge heights, road widths, and local transport rules when finalizing overall dimensions.

• Timber Specifications (Clause 6.2):

  • Density of timber ( \geq 720 \text{ kg/m}^3 )
  • Timber for trailer per IS: 2179-1962 (Timber for lorry bodies)
  • Use timber conforming to relevant IS standards for durability and strength.

• Additional Specs:

  • Grab rails and two heavy steps with non-skid treads near entrance (Clause 7.4.1)
  • Steel and aluminium materials must conform to respective IS standards for sheets, strips, and bars.

Summary Table

flowchart LR
    A[Books (n)] --> B[Calculate Payload: n + 500 kg]
    B --> C[Design Unit with Length ≤ 6.5 m]
    C --> D[Select Timber (Density ≥ 720 kg/m³)]
    D --> E[Conform to IS: 2179-1962]
    E --> F[Add Safety Features: Grab Rails & Steps]

IS 2661: Key Material Specifications

• Timber (Clause 6.2):

  • Density ≥ 720 kg/m³
  • Must conform to IS: 2179-1962 (timber for lorry bodies)
  • Relevant IS standards for steel sheets and corrosion protection apply where steel is used.

• Aluminium (Clause 6.3):

  • Suitable grades as per IS: 733-1975 (wrought aluminium bars, rods, sections)
  • Or IS: 737-1974 (wrought aluminium alloys, sheets, strip)

• Other Materials (Clause 6.4):

  • Must comply with relevant Indian Standards if available.

Summary Table of Materials

Notes on Construction (Clause 7.4.1)

• Provide grab rails and two heavy steps with non-skid treads near entrances.

flowchart TD
    A[Materials] --> B[Timber]
    A --> C[Aluminium]
    A --> D[Steel & Others]

    B --> E[IS 2179-1962]
    B --> F[Density ≥ 720 kg/m³]

    C --> G[IS 733-1975]
    C --> H[IS 737-1974]

    D --> I[Relevant IS standards]

This ensures compliance with IS 2661 for material quality and safety.

IS 2661: Design and Constructional Aspects - Key Points

Materials:

• Timber: Density ≥ 720 kg/m³; must conform to IS:2179-1962 for trailer construction.
• Steel: Use hot rolled carbon steel sheets/strips (3rd revision) or cold rolled carbon steel sheets (2nd revision).
• Aluminium: Wrought aluminium and alloys as per relevant IS specifications for engineering purposes.
• Corrosion Protection: Phosphate treatment as per IS standards.

Design Features (Clause 7.4.1):

• Provide grab rails and two heavy steps with non-skid treads near the entrance step-well for safety.

Fire Safety (Clause 8.7):

• Fit a 1-litre CO₂ fire extinguisher in the driver’s cabin conforming to IS:2878-1976.

Quick Reference Table: Timber Specifications

Summary Diagram of Constructional Elements

graph TD
A[Mobile Library Van Body] --> B[Timber (Density ≥ 720 kg/m³)]
A --> C[Steel Sheets/Strips]
A --> D[Aluminium Sections]
A --> E[Corrosion Protection (Phosphate Treatment)]
A --> F[Safety Features]
F --> G[Grab Rails]
F --> H[Heavy Non-Skid Steps]
A --> I[Fire Safety]
I --> J[1-litre CO₂ Fire Extinguisher (IS:2878)]

For detailed design, consult the full IS 2661:1978 document and referenced IS codes for materials and safety fittings.

IS 2661: Service Features for Mobile Library Vans

Key Specifications (Clause 8)

• Weather Protection (8.1):

  • Unit must insulate against external heat to maintain comfortable interior temperature.
  • Top and sides must be absolutely water-tight.
  • Rainwater should drain off to the rear via side channels without affecting entrance.
  • All openable parts (windows, doors) must be water-tight and dust-proof when closed.

• Windows (7.5.1):

  • Windows must be sufficiently waterproof to withstand strong monsoon showers when closed.

• Fire Safety (8.7):

  • A 1-litre CO₂ fire extinguisher conforming to IS:2878-1976 must be fitted in the driver’s cabin.

Summary Table of Service Features

Notes:

• Ensure all seals and joints are tested for water-tightness.
• Use materials and construction methods that comply with IS standards for durability and safety.
• Fire extinguisher placement should be easily accessible in the driver's cabin.

flowchart LR
    A[Mobile Library Van] --> B[Heat Insulation]
    A --> C[Water-tight Top & Sides]
    A --> D[Water-tight Openable Parts]
    A --> E[Rainwater Drainage Channel]
    A --> F[1L CO₂ Fire Extinguisher]
    B --> G[Comfortable Interior Temp]
    C --> H[Prevents Water Ingress]
    D --> I[Windows & Doors Sealed]
    E --> J[Rainwater Flows to Rear]
    F --> K[Driver's Cabin Safety]