Specification for hose-clamps and hose bandages for fire brigade use, Part 1: Hose-clamps

IS 5612 Part 1: Scope – Key Points & Sampling Specifications

Scope:
This part covers sampling and conformity tests for hose-clamps or similar products.

Sampling & Conformity (Clause 1.2, 1.3 & Appendix A)

• Sampling is done per lot, with each lot tested separately.
• Sample size and permissible defectives depend on lot size as per Table 1 (Scale of Sampling):

• Random selection of samples using random number tables (Clause 1.3).

Quality Requirements (Clause 6.1)

• Forgings: No seams, cracks, or surface defects; edges rounded.
• Castings: No blowholes or other defects.

Summary Diagram

flowchart TD
    A[Lot of Products] --> B{Lot Size}
    B -->|≤ 8| C[Sample All; 0 Defectives Allowed]
    B -->|9 to 15| D[Sample 8; 0 Defectives Allowed]
    B -->|16 to 25| E[Sample 13; 0 Defectives Allowed]
    B -->|26 to 50| F[Sample 20; 1 Defective Allowed]
    C & D & E & F --> G[Test Samples for Defects]
    G --> H{Pass?}
    H -->|Yes| I[Lot Accepted]
    H -->|No| J[Lot Rejected]

This ensures consistent quality control by statistically valid sampling and defect limits.

IS 5612 Part 1 (1977) – Hose-Clamps Summary

Types of Hose-Clamps (Clause 2.1)

• Type A: Made of aluminium alloy sheet.
• Type B: Made of flax canvas strap.

Key Specifications:

Important Notes (Clause 7.1 & 7.2)

• Clamp length tolerance ± 2 mm to match hose inner diameter.
• Type A clamp includes a saw cut (12 x 16 mm deep) for tightening.
• Type B clamp strap is stitched on nylon tape for strength.

Visual Concept (Simplified)

graph LR
A[Hose] --> B[Hole ≥ 3 mm]
B --> C{Clamp Type}
C -->|Type A| D[Aluminium Alloy Sheet Clamp]
C -->|Type B| E[Flax Canvas Strap Clamp]
D --> F[Pressure Test 70 N/cm² for 5 min]
E --> F
F --> G[No Leakage through Clamp/Strap]

This ensures hose integrity under pressure without leakage or damage.

IS 5612 Part 1 (1977) — Components and Design Key Points

Components (Clause 3)

• Type A Hose Clamp (Fig. 1):
  • Sheet in 3 hinged sections
  • Closing mechanism
  • Quick release device
• Type B Hose Clamp (Fig. 2):
  • Strap with metal strip

Material Specifications (Clause 6.1)

• Forgings: No seams, cracks, surface defects; sharp edges rounded
• Castings: Free from blow holes and defects

Key Dimensions (Clause 7.5)

• Hinge pin diameter: 6 mm
• Sheet thickness: 2 mm
• Sheet width: 60 mm
• Length tolerance: ±2 mm to ensure inner diameter matches hose size when closed

Additional Notes

• Nylon tape: 25 mm wide, stitched
• Strap: Unlined flax canvas
• Saw cut detail: 12 x 16 mm deep

Summary Table

graph LR
  A[Type A Hose Clamp] --> B[3-section hinged sheet]
  A --> C[Closing mechanism]
  A --> D[Quick release device]
  E[Type B Hose Clamp] --> F[Strap with metal strip]

This concise summary captures the essential design components and specifications per IS 5612 Part 1.

Key Specifications for Materials as per IS 5612 Part 1 (1977)

1. Forgings and Castings (Clause 6.1)

• Forgings: Must be free from seams, cracks, and surface defects; sharp edges rounded.
• Castings: Must be free from blow holes and other defects.

2. Aluminium Alloy Sheets (Clause 4.1)

• Shall conform to IS 737-1974 for Type A and binding ends of canvas in Type B.

3. Aluminium Alloy Castings (Clause 4.3)

• Shall conform to IS 617-1975, designation 4450 (A-8-WP).

4. Copper Alloy Castings (Clause 4.4)

• Sand Castings:
  • Grade 2 as per IS 318-1962 (Leaded Tin Bronze)
  • Grade 3 as per IS 304-1961 (High Tensile Brass)
• Die Castings:
  • Grade 3 as per IS 292-1961 (Brass)

Summary Table

Notes:

• All materials must comply with respective IS specifications for quality and defect-free conditions.
• Always check the latest revisions of IS codes for updates.

flowchart TD
    A[Materials] --> B[Forgings]
    A --> C[Castings]
    B --> D[Free from seams, cracks, defects]
    C --> E[Free from blow holes, defects]
    A --> F[

IS 5612 Part 1 - Shape and Dimensions Summary

• Types:

  • Type A: As per Fig. 1
  • Type B: As per Fig. 2

• Key Dimensions:

  • Hinge Pin Diameter: 6 mm
  • Sheet Thickness: 2 mm
  • Sheet Width: 60 mm
  • Nylon Tape Width: 25 mm (stitched)
  • Saw Cut Depth: 12 x 16 mm

• Tolerance:

  • Length tolerance ± 2 mm to ensure inner diameter matches hose size when closed.

• Material & Finish:

  • Forgings free from seams, cracks; edges rounded.
  • Castings free from blow holes and defects.
  • Nylon tape per IS 4228-1967.

Typical Dimension Table (mm)

flowchart LR
    A[Hose Clamp Type A] -->|Fig. 1| B[Dimensions]
    A --> C[Material & Finish]
    B --> D[6 mm Hinge Pin]
    B --> E[2 mm Thick, 60 mm Wide Sheet]
    B --> F[25 mm Nylon Tape]
    C --> G[Free from defects]
    C --> H[Edges rounded]

This ensures proper fit and durability per IS 5612 Part 1 (1977).

IS 5612 Part 1: Workmanship and Finish (Clauses 6.1 & 6.2)

• Forgings: Must be free from seams, cracks, and surface defects.
• Edges: All sharp edges are to be rounded to avoid stress concentration and injury.
• Castings: Should have no blow holes or other surface defects.
• Surface Finish: All metal surfaces shall have a natural bright finish (no coating or paint).

Key Specifications Summary:

Visual Inspection Criteria (Clause 7 & A-2.1):

• Verify shape and dimensions per Clause 5.
• Check workmanship and finish per Clause 6.
• Inspect for leakage as per Clause 7.

flowchart TD
    A[Start: Inspect Hose Clamp] --> B{Check Shape & Dimensions}
    B -->|Pass| C{Check Workmanship & Finish}
    B -->|Fail| D[Reject Clamp]
    C -->|Pass| E{Check Leakage}
    C -->|Fail| D
    E -->|Pass| F[Accept Clamp]
    E -->|Fail| D

This ensures quality and conformity of hose clamps per IS 5612 Part 1.

IS 5612 Part 1: Requirements for Leakage

Key Points from Clauses & Tables

• Surface Finish (6.2):
  All metal surfaces must be finished natural bright to avoid corrosion that can cause leakage.

• Sampling for Leakage Tests (Clause 1.3, A-1.3):
  Hose-clamps are selected randomly from the lot using random number tables.

• Inspection Criteria (A-2.1):
  Selected clamps are checked for:

  • Shape & dimensions (Clause 5)
  • Workmanship & finish (Clause 6)
  • Leakage (Clause 7)
    Any defective clamp in these aspects is rejected.

• Sampling Table for Leakage Test (Table 1):

Summary

• Leakage test samples are drawn based on lot size.
• Zero defect tolerance for small lots; 1% defective allowed for larger lots.
• Visual and leakage checks are mandatory for acceptance.

flowchart TD
    A[Select Lot] --> B[Random Sampling per Table 1]
    B --> C[Visual Inspection: Shape, Dimensions, Finish]
    C --> D{Leakage Test}
    D -->|Pass| E[Accept Lot]
    D -->|Fail| F[Reject Defective Pieces]

This ensures quality control and leak-tightness of hose-clamps per IS 5612 Part 1.

IS 5612 Part 1 - Marking Requirements (Clause 8.1 & 8.2)

• Each hose-clamp must be clearly and permanently marked with:

  • Manufacturer's name or trade-mark
  • Year of manufacture
  • Size of hose intended

• Optional: The product may also bear the Standard Mark (Clause 8.2).

Additional Specifications Summary

• Material Quality (Clause 6.1): Forgings must be free from seams, cracks, surface defects; sharp edges rounded. Castings free from blow holes and defects.
• Nylon tape for binding edges shall conform to IS: 4228-1967 (Clause 4.7).

Typical Marking Format Example:

flowchart LR
    A[Start: Manufacturing] --> B[Mark Manufacturer's Name]
    B --> C[Mark Year of Manufacture]
    C --> D[Mark Hose Size]
    D --> E[Optional: Apply Standard Mark]
    E --> F[Final Inspection]

Note: No explicit formulas or tables for marking are specified in IS 5612 Part 1; marking is primarily identification and traceability information.

IS 5612 Part 1 - Packing Specifications for Hose-Clamps

• Clause 9.1 (Type A Hose-Clamps):
  Each clamp is individually enclosed in a cellophane shroud and then packed in a corrugated board carton.

• Clause 9.2 (Type B Hose-Clamps):
  Each clamp is individually enclosed in a cellophane shroud, then packed six per carton of corrugated board.

• Additional Notes:

  • Corrugated board cartons must be sturdy enough to protect clamps during transport.
  • Nylon tape used for binding edges must conform to IS 4228-1967 (Clause 4.7).
  • Sampling for conformity uses random number tables (Clause 1.3).

Summary Table

This ensures protection, identification, and ease of handling during storage and transport.

IS 5612 Part 1: Sampling and Criteria for Conformity

Key Points from Appendix A (Clause 10.1)

A-1. Scale of Sampling (Table 1)

• Sampling: Select samples randomly using random number tables.
• Testing: Conduct tests on each lot separately.

A-2. Criteria for Conformity

• If the number of defectives found ≤ permissible number (from Table 1), the lot conforms to the specification.
• Otherwise, the lot is rejected.

Summary

• Sample size and acceptance criteria depend on lot size.
• Zero defectives allowed for smaller lots; one defective allowed for lots 26-50.
• Random sampling ensures unbiased selection.

flowchart TD
    A[Start: Lot Received] --> B{Lot Size?}
    B -->|≤8| C[Sample all items]
    B -->|9-15| D[Sample 8 items]
    B -->|16-25| E[Sample 13 items]
    B -->|26-50| F[Sample 20 items]
    C --> G[Count Defectives]
    D --> G
    E --> G
    F --> G
    G --> H{Defectives ≤ Permissible?}
    H -->|Yes| I[Lot Accepted]
    H -->|No| J[Lot Rejected]

This ensures quality control by statistically validating lot conformity per IS 5612 Part 1.

IS 5612 Part 1: Tests and Criteria for Conformity

Sampling (Appendix A, Clause A-1.2 & Table 1)

• Sampling is done lot-wise.
• Samples undergo visual inspection for shape, dimensions, workmanship, finish, and leakage.

Criteria for Conformity (Clause A-2.1)

• Any clamp failing in shape, dimensions, workmanship, finish, or leakage is defective.
• The lot is accepted only if the number of defectives is within permissible limits.

Inspection Points

• Visual check for shape & dimensions (see Clause 5)
• Workmanship & finish (see Clause 6)
• Leakage test (see Clause 7)

This ensures quality control by statistically verifying batches with zero or minimal defects based on lot size.