Specification for fire rake

IS 12796: Scope - Key Points & Specifications

Scope:

• Covers specifications for Fire Rake, a tool for raking and cutting small brush in forest fire line construction.
• Ensures indigenous manufacture and user procurement of tools meeting proper standards.

Key Specifications & Notes:

• Dimensions & Tolerances:

  • All dimensions in millimeters (mm).
  • Unless specified, tolerances = ±0.5 mm (Clause 1.5).

• Handle:

  • Must conform to IS 2892:1980 (Wooden handles for picks and beaters).

• Quality Control Sampling (Clause 6.1.2.2):

• Marking & Licensing:
  • Use of Standard Mark under BIS Act, 1986.
  • Continuous BIS surveillance ensures conformity.

Summary Diagram: Fire Rake Specification Flow

flowchart TD
    A[Fire Rake Specification] --> B[Dimensions in mm]
    B --> C[Tolerance ±0.5 mm]
    A --> D[Handle as per IS 2892:1980]
    A --> E[Quality Control Sampling]
    E --> F{Lot Size}
    F -->|Up to 25| G[Sample 3]
    F -->|26 to 50| H[Sample 5]
    F -->|51 to 100| I[Sample 6]
    A --> J[Standard Mark & BIS Licensing]

Note: For detailed dimensions and figures (e.g., Fig. 1 Fire Rake), refer to the full IS 12796 document.

IS 12796: Material Composition for Fire Rake Steel Components

• Steel Composition (Clause 2.1 & 1.04):

  • Carbon (C): 0.50% to 1.04%
  • Manganese (Mn): 0.30% to 0.50%
  • Hardness: 38 to 48 on Rockwell C scale

• Quality Assurance (Clause 6.1.2.3):

  • If manufacturer’s certificate is unavailable, test samples from each consignment must be individually examined to verify conformity.

• Tolerances (Clause 1.5):

  • Unless otherwise specified, dimensional tolerances are ±0.5 mm.

Summary Table: Steel Composition Limits

This ensures fire rake components have adequate strength and hardness for fire safety applications.

IS 12796: Dimensions and Tolerances Summary

• General Tolerance: ±0.5 mm where not otherwise specified (Clause 1.5).
• Units: All dimensions in millimeters.
• Handle Specification: Must conform to IS 2892:1980 for wooden handles (Clause 2.2).
• Head Assembly: Consists of 4 moving machined blades (Clause 3.1).
• Dimensions and Tolerances: Detailed in Fig. 1 (not provided here), which specifies exact sizes and permissible deviations.
• Sampling for Quality Control (Clause 6.1.2.2):

Key Notes:

• Use ±0.5 mm tolerance by default.
• Handle dimensions must comply with IS 2892.
• Head assembly blades are machined for precision.
• Refer to Fig. 1 for exact dimensional details.
• Sampling sizes ensure quality control per lot size.

If Fig. 1 is available, it should be consulted for exact blade lengths, widths, and assembly dimensions.

IS 12796: Surface Finish and Painting Specifications

• Clause 4.1:

  • The tool must be free from cracks, laps, burrs, and rough surfaces.
  • The head of the fire rake shall be painted with a suitable paint.
  • The blade section should be coated with a light film of oil or equivalent protective finish to prevent corrosion.

• Tolerances (Clause 1.5):

  • Unless otherwise specified, dimensional tolerances are ±0.5 mm.
  • All dimensions are in millimeters.

Summary Table for Surface Finish and Painting

Notes:

• Painting prevents rust and extends tool life.
• Oil film on blades reduces friction and corrosion during storage and use.

flowchart LR
    A[Tool Surface] --> B{Surface Finish}
    B -->|Free from| C[Cracks, Burrs, Laps]
    A --> D[Head]
    D --> E[Painted]
    A --> F[Blade Section]
    F --> G[Light film of oil]

This ensures compliance with IS 12796 for durability and usability of fire rakes.

IS 12796 - Marking: Key Points & Sampling Table

Marking Requirements (Clause 5.1):

• Fire rake must be marked with:
  • Nominal mass
  • Manufacturer's initials
  • Recognized trade-mark

Sampling Table for Lots under Quality Control (Clause 6.1.2.2)

Additional Notes:

• Standard Mark usage is governed by the BIS Act, 1986.
• The Standard Mark assures compliance with IS standards under BIS supervision.
• Continuous surveillance by BIS ensures conformity.
• Tolerances (if unspecified) are ±0.5 mm.
• Dimensions are in millimeters.
• For rounding test results, follow IS 2:1960 rules.

flowchart TD
    A[Fire Rake Production] --> B[Marking]
    B --> C{Marking Details}
    C -->|Nominal Mass| D[Stamped on Tool]
    C -->|Manufacturer's Initials| E[Stamped on Tool]
    C -->|Trade-mark| F[Stamped on Tool]
    B --> G[Quality Control Sampling]
    G --> H[Sample Size per Lot Size]

This ensures traceability and quality compliance for fire rakes per IS 12796.

IS 12796 - Sampling and Criteria for Conformity

Sampling Procedure (Clause 6.1.2.2 & Table 1)

• Samples are taken randomly from each lot.
• Sample size depends on lot size as:

Criteria for Conformity

• All sampled items must pass visual and specified requirements (Clauses 3, 4, 5).
• If any sample fails, the entire lot is rejected.
• Fire rake marking (Clause 5.1) must include:
  • Nominal mass
  • Manufacturer’s initial
  • Recognized trade-mark

Additional Notes

• The Standard Mark use is regulated by BIS under the Bureau of Indian Standards Act, 1986.
• Continuous quality control and inspection by BIS ensure conformity.

flowchart TD
    A[Lot Produced] --> B[Random Sampling]
    B --> C{Sample Size}
    C -->|Up to 25| D[3 Samples]
    C -->|26 to 50| E[5 Samples]
    C -->|51 to 100| F[6 Samples]
    D & E & F --> G[Visual & Specified Tests]
    G --> H{All Samples Pass?}
    H -->|Yes| I[Lot Conforms]
    H -->|No| J[Lot Rejected]

This ensures a statistically valid sampling plan for quality assurance.