steel shelving cabinets (adjustable type) -Specification
1984 Edition

Scope Overview (Clause 3.1)

• Defines fabrication and size parameters for adjustable steel shelving cabinets.
• Applicable to both small and large variants with specified overall dimensions, excluding pedestal height.

Dimension Tables:

Note: Heights are exclusive of pedestal measurements.

Locker Internal Dimensions (Clause 4.10):

Referenced Additional Specifications:

• Gas welding filler rods and wires
• Covered metal arc welding electrodes
• Resistance spot welding electrodes
• Hot and cold rolled carbon steel sheets
• Ordinary quality structural steel
• Slotted countersunk screws

Visual Diagram: Cabinet Size Variants

graph TD
    Cabinet[Steel Shelving Cabinet] --> Small[Small Size]
    Cabinet --> Large[Large Size]
    Small --> HtS[Height: 1155 mm]
    Small --> WdS[Width: 760 mm]
    Small --> DpS[Depth: 430 mm]
    Large --> HtL[Height: 1855 mm]
    Large --> WdL[Width: 910 mm]
    Large --> DpL[Depth: 480 mm]

This section establishes size and fabrication standards to maintain uniformity and quality.

Material Specifications & Key Standards

1. Steel Grades:

• Mild steel rounds and flat bars must meet Grade Fe 310-0 (St 320) as per IS 1977:1975.

2. Sheet Metal Components (Clause 8.1):

• Use hot rolled or cold rolled carbon steel sheets complying with respective IS standards (3rd revision for hot rolled, 2nd for cold rolled).

3. Welding Consumables:

• Filler rods and wires for gas welding as per IS specifications (2nd revision).
• Covered electrodes for metal arc welding in accordance with IS 814 (Part 2, 4th revision).
• Resistance spot-welding electrodes conforming to IS requirements.

4. Cabinet Dimensions (Clause 3.1, Table 1):

*Pedestal height excluded.

Summary: Steel materials and consumables must adhere to Indian Standard specifications to ensure quality and compatibility with manufacturing processes.

graph TD
MaterialSelection --> SteelRounds[Mild Steel Rounds & Flats: Fe 310-0]
MaterialSelection --> SheetMetal[Sheet Metal Components]
SheetMetal --> HotRolled[Hot Rolled Sheets]
SheetMetal --> ColdRolled[Cold Rolled Sheets]
MaterialSelection --> WeldingConsumables[Welding Consumables]
WeldingConsumables --> FillerRods[Filler Rods & Wires]
WeldingConsumables --> CoveredElectrodes[Covered Electrodes]
WeldingConsumables --> SpotWeldingElectrodes[Spot Welding Electrodes]

This guarantees compliance with IS 3312's material requirements.

Dimensional Standards and Tolerance Limits

1. Overall Cabinet Dimensions (Clause 3.1 & Table 1):

*Height does not include pedestal height.

2. Allowed Tolerances (Clause 3.2):

• ±5 mm permitted on height, width, and depth measurements.

3. Internal Locker Dimensions (Clause 4.10 & Table 2):

4. Screw Specifications (Clause 2.5):

• Screws must comply with IS 1365-1978.

Diagram: Cabinet and Locker Dimensions

graph TD
Cabinet[Steel Shelving Cabinet] --> OverallDims[Overall Dimensions]
OverallDims --> Height[Height: 1155 / 1855 mm]
OverallDims --> Width[Width: 760 / 910 mm]
OverallDims --> Depth[Depth: 430 / 480 mm]
Cabinet --> LockerDims[Locker Internal Dimensions]
LockerDims --> LHeight[Height: 250 / 300 mm]
LockerDims --> LWidth[Width: 758 / 908 mm]
LockerDims --> LDepth[Depth: 380 / 430 mm]

All dimensions are expressed in millimeters, and tolerances apply solely to overall cabinet sizes.

Construction Elements and Manufacturing Details

1. Steel Sheet Components (Clause 8.1):

• Fabrication uses hot rolled or cold rolled carbon steel sheets conforming to IS standards.
• Welding materials and methods:
  • Gas welding filler rods and wires as specified (2nd revision).
  • Covered electrodes for metal arc welding (4th revision).
  • Resistance spot welding electrodes per IS.
• Screws: Slotted countersunk head screws compliant with IS 1365 (3rd revision).

2. Cabinet Dimensions (Clause 3.1, Table 1):

*Pedestal height is excluded.

3. Corrosion Protection (Clause 9.5):

• Test panels sized 150 x 100 mm, thickness 1.25 mm.
• Panels must exhibit no corrosion after condensation testing as per IS 101-1964.

Fabrication Workflow Diagram:

flowchart TD
    RawMaterial[Raw Steel Sheets] --> Cutting[Cutting to Required Sizes]
    Cutting --> Forming[Forming and Bending]
    Forming --> Welding[Welding Processes]
    Welding --> Assembly[Assembly using Screws]
    Assembly --> SurfaceTreatment[Surface Preparation and Corrosion Protection]

This sequence aligns with IS 3312 requirements for cabinet construction.

Welding and Joining Instructions

1. Welding Methods (Clause 5.2):

• Gas welding according to IS 1323:1966.
• Arc welding as per IS 816:1969 (Part 2 for sheet metal).
• Spot welding complying with IS 819:1957.

2. Assembly Process (Clause 5.1):

• Cabinet parts may be joined via bolting or welding methods.

3. Cabinet Sizes (Clause 3.1, Table 1):

*Height measurement excludes pedestal height.

4. Additional Welding Consumables:

• Filler rods and wires for gas welding as per IS.
• Covered electrodes for metal arc welding.
• Spot welding electrodes to IS standards.

Welding and Assembly Flowchart:

flowchart TD
    Start[Begin Fabrication] --> SelectWeld{Choose Welding Method}
    SelectWeld -->|Gas Welding| GasWeld[IS 1323 Standard]
    SelectWeld -->|Arc Welding| ArcWeld[IS 816 Standard]
    SelectWeld -->|Spot Welding| SpotWeld[IS 819 Standard]
    GasWeld --> JoinComponents[Assemble Components]
    ArcWeld --> JoinComponents
    SpotWeld --> JoinComponents
    JoinComponents --> FinalAssembly[Complete Assembly by Bolting or Welding]
    FinalAssembly --> End[Fabrication Complete]

Refer to the mentioned IS codes for detailed welding parameters.

Details on Accessories for Steel Shelving Units

Accessory Specifications:

Cabinet Dimensions (excluding pedestal):

Welding Standards for Accessories:

• Gas welding: IS 1323-1966
• Arc welding: IS 816-1969
• Spot welding: IS 819-1957

Notes:

• Pedestal height is not included in cabinet height.
• Mirror frames are usually mounted on the exterior of the left door.
• Tie hangers must receive surface finishing as per Clause 8.1.

Accessory Overview Diagram:

flowchart LR
    Cabinet[Steel Shelving Cabinet] --> MirrorFrame[Mirror Frame]
    Cabinet --> Mirror[Mirror]
    Cabinet --> TieHanger[Tie Hanger]
    MirrorFrame --> MSsteel[Mild Steel Sheet ≥ 0.8 mm]
    Mirror --> Glass[Plate Glass ≥ 5 mm]
    TieHanger --> AluminiumOrSteel[Aluminium or Mild Steel ≥ 0.63 mm]

This section summarizes essential accessory specifications aligned with IS 3312.

Surface Finishing Specifications and Procedures

1. Finishing Criteria (Clauses 8.1.3 & 8.2):

• Components must be coated in a colour mutually agreed upon by buyer and manufacturer.
• Enamel paint application includes:
  • Primer coat (phosphating recommended for corrosion resistance)
  • One or more enamel paint coats complying with IS 151-1950, IS 2932-1974, and IS 2933-1975.

2. Functional Requirements (Clause 9):

• Paint finish must provide enhanced corrosion resistance, durability, and an appealing appearance.
• Phosphating treatment is advised prior to painting.

3. Purchaser's Specifications (Clause 10.1):

• Details to specify:
  • Requirement for lockers or drawers
  • Number of adjustable shelves
  • Desired finish colour
  • Alternative construction or finishing methods if applicable

4. Cabinet Dimensions (Clause 3.1, Table 1):

*Excludes pedestal height.

Recommended Finishing Process:

flowchart TD
    Prep[Surface Preparation] --> Phosphating[Phosphate Treatment]
    Phosphating --> Primer[Primer Coat Application]
    Primer --> Enamel[Enamel Paint Coats]
    Enamel --> Inspection[Final Inspection and Approval]

This process ensures a durable, corrosion-resistant, and visually pleasing finish aligned with IS 3312 standards.

Key Surface Preparation Steps

1. Cleaning (Clause 8.1.1):

• Remove all dents, burrs, and sharp edges.
• Perform pickling, scrubbing, and rinsing to eliminate grease, rust, scale, and foreign particles.

2. Phosphating Treatment (Clause 8.1.2):

• Apply phosphating immediately after pickling following Class C of IS 3618-1966.
• Process must adhere to IS 6005-1970 guidelines.
• Use putty (IS 110-1968) for filling imperfections.
• Apply aluminium primer conforming to IS 5660-1970.

3. Corrosion Resistance Testing (Clause 9.5):

• Test panels should measure 150 x 100 mm with 1.25 mm thickness.
• Conduct condensation corrosion test as per IS 101-1964 Clause 18.
• Panels must show no signs of corrosion post-test.

4. Flexibility and Adhesion Testing (Clause 9.3):

• Samples of 150 x 50 mm and 0.315 mm thickness mild steel.
• Test per IS 101-1964 Clause 16.
• Paint film must remain intact without cracking or detachment under 10x magnification.

Surface Preparation Summary Table:

flowchart TD
    Start[Steel Component] --> RemoveDefects[Remove dents, burrs, sharp edges]
    RemoveDefects --> Pickling[Pickle, scrub, rinse]
    Pickling --> Phosphating[Apply phosphating (Class C)]
    Phosphating --> Filling[Putty application]
    Filling --> Primer[Apply aluminium primer]
    Primer --> Testing[Conduct corrosion and adhesion tests]

This process prepares steel surfaces for optimal finishing and protection.

Testing Protocols and Acceptance Criteria

1. Result Rounding (Clause 0.4):

• Test outcomes must be rounded in accordance with IS 2-1960 while maintaining significant figure consistency with specified values.

2. Pressure Testing (Clause 9.2):

• Sample: Mild steel plate, 0.315 mm thickness.
• Procedure follows IS 101:1964 Clause 15.2.
• Acceptance requires no exposed metal surface post-test.

3. Corrosion Resistance Testing (Clause 9.5):

• Sample panel dimensions: 150 x 100 mm, thickness 1.25 mm.
• Test conducted per IS 101:1964 Clause 18.
• Acceptance criterion is absence of corrosion after condensation exposure.

Relevant Cabinet Dimensions (Clause 3.1):

*Pedestal height excluded.

Testing Summary Table:

Flow diagrams for testing procedures are available upon request.

Marking Requirements for Steel Shelving Cabinets

1. Manufacturer Identification (Clauses 12.1 & 12.1.1):

• All cabinets must bear a manufacturer's mark to identify the maker.

2. ISI Certification Mark:

• Optional marking indicating compliance with Indian Standards under ISI’s quality supervision.
• Usage governed by the Indian Standards Institution (Certification Marks) Act and associated regulations.

3. Marking Characteristics:

• Marks should be clear, legible, and permanent to ensure traceability.

4. Licensing and Contact Information:

• For ISI mark licensing, contact Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002.
• Regional offices provide support and licensing assistance.

Marking Requirements Table:

Marking Process Diagram:

flowchart TD
    Cabinet[Steel Shelving Cabinet] --> ManufacturerMark[Manufacturer Identification (Mandatory)]
    Cabinet --> ISIMark[ISI Certification Mark (Optional)]
    ISIMark --> Licensing[ISI Licensing & Oversight]
    Licensing --> Quality[Assurance and Conformity]

Ensure proper marking for quality assurance and compliance.

Installation Space Requirements for Shelving Units

Clearance Guidelines (Clause 3.1 Note):

• Top clearance: 20 mm
• Side clearance: 10 mm on each side
• Depth clearance: 5 mm

These gaps facilitate proper fitment within recesses or openings.

Cabinet Dimensions (Table 1):

*Pedestal height not included.

Locker Internal Dimensions (Table 2):

Safe Distributed Load Capacities (Table 3):

Installation Clearance Diagram:

graph TD
    Cabinet[Shelving Cabinet] --> TopClearance[Top Clearance: 20 mm]
    Cabinet --> SideClearance[Side Clearance: 10 mm each side]
    Cabinet --> DepthClearance[Depth Clearance: 5 mm]

Adhering to these clearances and loads ensures safe and proper installation.

Locking System Specifications and Dimensions

1. Lock Requirements (Clauses 4.9 & 4.10.3.1):

• Lock type: Minimum 6-lever lock with duplicate keys.
• Materials: Locks and keys must be made from corrosion-resistant materials.
• Standard compliance: Locks to conform with IS 729:1979.
• Locking mechanisms:
  • Lockers use two-way bolting controlled by lock.
  • Steel shelving cabinets employ a three-way bolting system controlled by lock.
• Handles constructed from brass, zinc alloy, or other corrosion-resistant materials.

2. Locker Internal Sizes (Clause 4.10, Table 2):

Summary:

• Locks: 6-lever, duplicate keys, corrosion-resistant.
• Locking: Two-way bolting for lockers, three-way for cabinets.
• Handles: Brass or zinc alloy, non-corrosive.
• Locker sizes standardized as per specifications.

flowchart LR
    LockerUnit[Locker] --> Lock6[6-lever Lock]
    Lock6 --> LockSystem{Locking Mechanism}
    LockSystem --> TwoWay[Two-way Bolting for Lockers]
    LockSystem --> ThreeWay[Three-way Bolting for Cabinets]
    Lock6 --> DuplicateKeys[Duplicate Keys]
    Lock6 --> NonCorrodible[Corrosion-Resistant Material]
    LockerUnit --> Handle[Handle]
    Handle --> Material[Brass or Zinc Alloy]

This ensures robust security and durability aligned with IS 3312.