Metal Side Racks (Adjustable Type) - Specification

IS 3761 - Scope & Key Specifications for Side Racks

Scope (Clause 3.1.1 & related)

• Side racks shall have three shelves:
  • Top shelf flush with top of angle posts (first hole positioned accordingly).
  • Bottom shelf fixed at the second hole from the bottom.
• Overall dimensions (Clause 3.1):

Material Specifications Referenced

• Hot rolled carbon steel sheet & strip (3rd revision)
• Cold rolled carbon steel sheets (2nd revision)
• Structural steel (standard quality, 5th revision)
• Rolled steel beam, channel, angle sections (1st revision)
• Wood particle boards, veneered particle boards, blockboards, plywood (various revisions)

Notes on Compliance

• Rounding off test results as per IS 2:1960 for significant figures.
• Purchaser must supply technical info when ordering (Clause 0.3).

Summary Diagram of Side Rack Shelves Positioning

graph TD
  A[Angle Post] --> B[Top Shelf (flush with top)]
  A --> C[Middle Shelf]
  A --> D[Bottom Shelf (2nd hole from bottom)]

This ensures uniformity in rack manufacture and installation.

IS 3761 - Materials: Key Specifications & References

• Mild Steel Sheet:

  • Shall conform to Grade 0 of IS:1079-1973 or Grade 0 of IS:513-1973 (Clause 2.1).

• Steel Types Covered:

  • Hot rolled carbon steel sheet & strip (3rd revision)
  • Cold rolled carbon steel sheets (2nd revision)
  • Structural steel (standard quality) (5th revision)
  • Rolled steel beam, channel, angle sections (1st revision)

• Wood-Based Materials:

  • Particle boards (medium density)
  • Veneered particle boards
  • Blockboards
  • Plywood (general purpose)

• Corrosion Protection Tests:

  • Pressure test on mild steel plates (0.315 mm thick) per IS:101-1964 (Clause 7.2)
  • Condensation corrosion test on mild steel panel (150 x 100 mm, 1.25 mm thick) per IS:101-1964 (Clause 7.5)

• Surface Treatments & Paints:

  • Phosphate treatment (specification & code of practice)
  • Ready mixed paints and enamels (various types for primers, finishing, exterior, etc.)
  • Putty for wood frames
  • Wood finishing code of practice

Summary Table of Key Material Specs

This ensures materials used in IS 3761 conform to established Indian standards for quality, durability, and corrosion resistance.

IS 3761: Dimensions and Tolerances for Side Racks

Key Dimensions (Clause 3.1)

• The side rack has 3 shelves.
• Top shelf flush with top of angle posts.
• Bottom shelf fixed at the second hole from bottom (Clause 3.1.1).

Tolerances (Clause 3.2)

• All specified dimensions shall not vary by more than ± 5 mm.

Material Specification

• Plywood: Grade BWR, Type BB as per IS 303-1975 (Clause 2.7).

Summary Table

graph TD
    A[Side Rack] --> B[Top Shelf (flush with angle posts)]
    A --> C[Middle Shelf]
    A --> D[Bottom Shelf (2nd hole from bottom)]
    A --> E[Dimensions: 710x900x375 mm ±5 mm]

This ensures dimensional accuracy and proper assembly per IS 3761 standards.

IS 3761: Key Specifications for Components (Wood Based Panel & Metal Side Racks)

1. Wood Based Panel Components (Clause 6.5)

• Use medium density particle boards, veneered particle boards, blockboards, or plywood as per relevant IS standards:
  • IS 3087 (Particle Boards)
  • IS 3097 (Veneered Particle Boards)
  • IS 1659 (Blockboards)
  • IS 4990 (Plywood)

2. Metal Side Racks Components (Clauses 3.1.1, 4.1)

• Side racks dimensions (Clause 3.1):

• Shelf positioning (Clause 3.1.1):

  • Top shelf flush with top of angle posts (first hole aligned accordingly)
  • Bottom shelf fixed at second hole from bottom

• Components (Clause 4.1):

  • Angle posts, shelves, and fixing elements made from hot/cold rolled carbon steel sheets or strips complying with:
    • IS 513 (Rolled Steel Sections)
    • IS 1079 (Cold Rolled Sheets)
    • IS 5986 (Hot Rolled Sheets)

3. Typical Assembly Notes:

• Shelves fixed by bolts/nuts at designated holes
• Ensure dimensional tolerances as per Table 3.1

graph TD
    A[Angle Posts] --> B[Top Shelf (flush)]
    A --> C[Middle Shelf]
    A --> D[Bottom Shelf (2nd hole from bottom)]
    B & C & D --> E[Bolted Assembly]

Summary: Use specified wood panels per IS codes; metal racks use hot/cold rolled steel components with shelves positioned as per holes on angle posts. Dimensions fixed at 710×900×375 mm.

IS 3761: Assembly Key Specifications & Formulas

1. Side Rack Dimensions (Clause 3.1 & Table 3)

2. Shelf Positioning (Clause 3.1.1)

• Top shelf: Flush with top of 40x40x3 mm angle posts; first hole positioned accordingly.
• Bottom shelf: Fixed at the second hole from bottom.
• Middle shelf: Positioned between top and bottom shelves (three shelves total).

3. Materials

• Angle posts: Hot rolled carbon steel, 40x40x3 mm.
• Shelves: 20 mm thick wood-based panels (veneered/particle/plywood as per specifications).

4. Assembly (Clause 5.1)

• Components assembled by bolting.
• Ensure holes align with shelf fixing positions.

5. Surface Preparation (Clause 6.1)

• Remove dents, burrs, sharp edges.
• Pickle, scrub, rinse components to remove grease, rust, scale.

6. Fixing Arrangement (Fig. 1)

• Shelves fixed on angle posts using bolts through pre-drilled holes.
• Top shelf flush with post top; bottom shelf at second hole from bottom.

graph TD
A[Angle Post 40x40x3 mm] --> B[Top Shelf (Flush with top)]
A --> C[Middle Shelf (Between top & bottom)]
A --> D[Bottom Shelf (2nd hole from bottom)]
B & C & D --> E[Bolted Assembly]

This concise summary covers key assembly dimensions, materials, and fixing details per IS 3761.

IS 3761: Surface Treatment and Finishes - Key Points

1. Surface Finish Requirements (Clause 6.3.1)

• Finish must be smooth, uniform, and free from visible defects.
• Dry film thickness ≥ 0.10 mm.
• Finish should not chip or flake easily.

2. Pressure Test (Clause 7.2)

• Samples: Mild steel plates, thickness 0.315 mm.
• Test as per IS 101-1964 (Clause 15.2).
• No metal surface should be visible after test separation.

3. Corrosion Protection Test (Clause 7.5)

• Panels: Mild steel, size 150 x 100 mm, thickness 1.25 mm.
• Test per IS 101-1964 (Clause 18).
• No corrosion signs allowed after condensation test.

4. Finishing Specifications

• Phosphate treatment as per IS codes for corrosion protection.
• Paints and primers as per IS specifications (ready mixed paints, primers, enamels).
• Wood panels: Transparent gloss French polish or stained dark with polish (IS 2338 Part 1).

Summary Table: Surface Treatment Thickness & Test Sizes

Additional Notes:

• Use IS 101-1964 for pressure and corrosion testing procedures.
• Follow IS codes for paint and enamel specifications for durability.
• Wood finishes per IS 2338 Part 1.

flowchart TD
    A[Steel Plate Preparation] --> B[Surface Treatment]
    B --> C[Pressure Test (IS 101-1964)]
    B --> D[Corrosion Test (IS 101-1964)]
    C --> E[No visible metal surface]
    D --> F[No corrosion after condensation]
    B --> G[Dry film thickness ≥ 0.10

IS 3761: Performance Requirements of Finish

Key Specifications (Clauses 6.3.1, 6.5.2, 7.2)

• Finish Quality:

  • Smooth, uniformly applied, free from visible defects.
  • Shall not chip or flake easily.
  • Minimum dry film thickness: 0.10 mm.

• Wood-based Panels (Clause 6.5.2):

  • Finished with transparent gloss French polish or stained dark and polished.
  • Refer IS 2338 (Part I) for detailed finishing of wood panels.

• Pressure Test (Clause 7.2):

  • Test samples: Mild steel plates, thickness 0.315 mm, finished as per Clause 6.
  • Test per IS 101: Pressure applied; after separation, metal surface must not be visible.

Additional Notes:

• Finish must ensure corrosion protection and durability.
• Purchaser must specify colour and finish clearly (Clause 8.1).

Summary Table: Finish Requirements

flowchart LR
    A[Raw Material] --> B[Surface Preparation]
    B --> C[Application of Finish]
    C --> D[Dry Film Thickness ≥ 0.10 mm]
    D --> E[Pressure Test (IS 101)]
    E --> F{Metal Surface Visible?}
    F -- No --> G[Pass: Finish Accepted]
    F -- Yes --> H[Fail: Rework Required]

This ensures a durable, defect-free finish per IS 3761 standards.

IS 3761 - Information to be Supplied by Purchaser (Clause 8.1)

When placing an order, the purchaser must provide:

• Colour and Finish: Specify the exact colour and surface finish required.
• Alternate Construction/Finish Methods: If alternate methods are preferred, clearly state them in the order.

Additional Relevant Specifications:

• Shelf Positioning (Clause 3.1.1):

  • Side racks have 3 shelves.
  • Top shelf flush with top of angle posts (first hole positioned accordingly).
  • Bottom shelf fixed at the second hole from the bottom.

• Corrosion Test (Clause 7.5):

  • Test panel: Mild steel, 150 x 100 mm, 1.25 mm thick.
  • Finish as per Clause 6.
  • Test per IS 101:1964, Clause 18.
  • Requirement: No corrosion after condensation test.

Summary Table: Purchaser’s Information Requirements

This ensures clarity and compliance with IS 3761 for manufacturing and quality control.

IS 3761 - Marking of Steel Racks: Key Points

• Clause 10.1:
  All steel racks must be marked with a suitable manufacturer's identification mark for traceability.

• Clause 10.1.1:
  Steel racks may also carry the ISI Certification Mark, indicating compliance with IS standards under ISI's quality control system.

• ISI Certification Mark:

  • Governed by the Indian Standards Institution (Certification Marks) Act.
  • Ensures product conformity through inspection, testing, and continuous surveillance.
  • Manufacturer must obtain a license to use the ISI mark.

Summary Table for Marking Requirements

Additional Notes

• Marking ensures product traceability and quality assurance.
• ISI mark usage requires adherence to ISI's licensing and inspection protocols.
• Marking should be permanent and legible throughout the rack's service life.

flowchart TD
    A[Steel Rack] --> B[Manufacturer's Mark (Mandatory)]
    A --> C[ISI Certification Mark (Optional)]
    C --> D[License from ISI]
    D --> E[Quality Control & Inspection]

This ensures compliance and quality traceability per IS 3761.

IS 3761: Testing Methods - Key Points

1. Pressure Test (Clause 7.2)

• Sample: Mild steel plates, thickness = 0.315 mm.
• Procedure: As per IS 101:1964 Clause 15.2.
• Acceptance: Metal surface must remain non-visible after separation (no damage).

2. Corrosion Protection Test (Clause 7.5)

• Sample: Mild steel panel, size = 150 x 100 mm, thickness = 1.25 mm.
• Procedure: Test under condensation conditions as per IS 101:1964 Clause 18.
• Acceptance: No visible corrosion after test.

3. Rounding Off Test Results (Clause None: 0.5)

• Follow IS 2-1960 for rounding.
• Keep the same number of significant digits as the specified value.

Related IS Codes for Reference:

• IS 101:1964 (Testing procedures for paint and corrosion)
• IS 2:1960 (Rounding off rules)
• Various IS specs for steel and coatings (phosphating, enamels, primers)

flowchart TD
    A[Sample Preparation] --> B[Pressure Test (IS 101:15.2)]
    B --> C{Surface Condition}
    C -- No visible damage --> D[Pass]
    C -- Visible damage --> E[Fail]

    A --> F[Corrosion Test (IS 101:18)]
    F --> G{Corrosion Presence}
    G -- No corrosion --> H[Pass]
    G -- Corrosion --> I[Fail]

Summary: IS 3761 mandates pressure and corrosion tests on mild steel samples per IS 101:1964, with strict acceptance criteria for surface integrity and corrosion resistance.