ferrules for water services

IS 2692: Scope - Key Specifications and Tables

IS 2692 covers dimensions, marking, and tolerances for ferrules, plugs, washer plates, and washers used in water services.

Key Dimensions (Nominal Sizes: 10 to 50 mm)

Thread Tolerances

• Screw thread H and P: Medium class bolt tolerances.
• Thread E (internal on body): Medium class nut tolerances.
• Thread M (external on cap): Medium class bolt tolerances.

Marking Requirements (Clause 11.1)

• Manufacturer identification.
• Nominal size.

Typical Ferrule Length of 'T' Branch (mm)

IS 2692: Referenced Indian Standards - Key Points

Clause 2.1 & Annex A list essential Indian Standards related to ferrules and washers for water services:

Important Specifications from Clause 16.3 (Marking & Dimensions)

• Bolt threads H and P have medium class tolerances.
• Washer plate stem must fit smoothly in the plug.

Ferrule Dimensions (Typical Values)

IS 2692: Definitions & Key Specifications Summary

Key Definitions (Clause 3.0):

• Defines components of ferrules such as body, plug, cap, washer plate, nut, resilient washer, copper washer, and key.

Key Specifications from Clause 8.5 and Tables

Key Dimensions for Key (Fig. 2)

Notes on Key Fabrication (Clause 8.5)

• One end: ring with square slot for ferrule cap head.
• Other end: plain.
• Third branch: square tapered end to fit plug head recess.
• Purchaser to specify key requirement and quantity.

Summary Diagram of Key (T-shaped)

graph LR
  A[Ring End with Square Slot] --> B[T-Branch]
  B --> C[Plain End]
  B --> D[Square Tapered End for Plug]

This concise summary covers definitions, materials, key dimensions, and fabrication details for ferrule components per IS 2692. For detailed drawings and tolerances, refer to the standard's figures and annexes.

IS 2692: Nominal Sizes and Key Dimensions for Ferrules

Nominal Size Designation (Clause 4.1.1)

• Nominal sizes are based on the nominal bore of the inlet connection.
• Available nominal sizes (Clause 4.1):
  8, 10, 15, 20, 25, 32, 40, 50 mm

Key Dimensions for Ferrule Body and Cap (Table 2, Clause 6.1)

IS 2692: Key Materials & Specifications Summary

1. Materials for Ferrule Components (Clause 5.1, Table 1)

2. Key Fabrication (Clause 8.5)

• Material: Round malleable casting or forged mild steel bar.
• Shape: 'T' shaped key (see Fig. 2).
• One end: Ring with square slot for ferrule cap.
• Other end: Plain with square tapered end for plug head.
• Length of 'T' branch (L min) varies by nominal ferrule size:

3. Washer Dimensions & Markings (Clause 16.3, Table 11)

• Thickness of washer plate: M
• Thickness of rubber/leather washer (new): N
• Lift of washer plate (with washer)
• Outside diameter of copper washer: Q
• Thickness of copper washer: R
• Inside diameter of copper washer: S

4. References (Annex A)

• IS 318, IS 319, IS 320, IS 3487, IS 4346, IS

IS 2692 Key Dimensions & Specifications Summary

1. Body and Cap Dimensions (Table 2, Clause 6.1)

2. Plug, Washer Plate & Washer Dimensions (Table 3, Clause 6.1)

IS 2692: Manufacture and Workmanship - Key Specifications

1. Dimensions (Clause 6.1, Tables 2 & 3)

• Ferrule Sizes: 10, 15, 20, 25, 32, 40, 50 mm (6 mm same as 10 mm except inlet bore 8 mm)

• Table 2: Body & Cap Dimensions (in mm, sample values for 10 mm size)

  • Bore of seating (A): 9.4 - 9.6
  • Outside diameter of seating (B): 14.7 (min)
  • Height of seating (C): 1.6 (min)
  • Major diameter of internal thread (E): M24 × 1.5
  • Length of internal thread (F): 45.0
  • Length of screwed shank (L): 25.0
  • Thickness of flange of cap (P): 2.8
  • Bore at ends (R): 8.8

• Table 3: Plug, Washer Plate & Washer Dimensions (in mm, sample for 10 mm size)

  • Size across flats of square recess on plug head (A): 7.0
  • Depth of square recess (B): 5.0
  • Length of external thread on plug (C): 21.0
  • Thickness of washer plate (M): 3.2
  • Thickness of rubber/leather washer (N): 4.0
  • Outside diameter of copper washer (Q): 7.0
  • Thickness of copper washer (R): 1.5

2. Workmanship (Clause 7 & 16.3)

• Threads (E & M) must have medium class bolt/nut tolerances.
• Stem of washer plate must fit smoothly in the plug.
• Marking on each ferrule must include:
  • Source of manufacture
  • Nominal size (Clause 11.1)

3. Notes

• Screw threads conform to IS 4218 (ISO metric screw threads).
• Materials and casting conform to related IS standards listed in Annex A (e.g., IS 318, IS 319, IS 320).
• Sampling and conformity criteria per Annex B.

Summary Diagram of Ferrule Components

IS 2692: Construction and Design Requirements - Key Specifications

1. Materials (Clause 5.1)

2. Dimensions for Ferrule Components (Clause 6.1)

• Body & Cap (Table 2): Dimensions vary by nominal size (10 to 50 mm). Example for size 20 mm:

  • Bore of seating, A: 19.1 - 18.8 mm
  • Major diameter of internal thread on body, E: M30 × 1.5
  • Length of internal thread on body, F: Min 46 mm
  • Thickness of flange of cap, P: 3.2 mm

• Plug, Washer Plate & Washer (Table 3): Key dimensions for nominal size 20 mm:

  • Size across flats of square recess, A: 8.0 mm (min)
  • Length of external thread on plug, C: 22 mm (min)
  • Thickness of washer plate, M: 4.0 mm (min)
  • Thickness of rubber/leather washer, N: 4.0 mm
  • Outside diameter of copper washer, Q: 15 mm

3. Threads

• Bolt and nut threads have medium class tolerances.
• Typical thread sizes for plugs and caps range from M24 × 1.5 to M72 × 1.5 depending on nominal size.

4. Key Design (Clause 8.5)

• Fabricated from malleable cast or forged mild steel.
• 'T' shaped with one end ring having a square slot to fit plug head.

IS 2692: Sampling and Criteria for Conformity

Key Points from Annex B & Clause 9.1

• Sampling is done lot-wise to check conformity.
• Sample size and acceptance criteria depend on lot size.
• Permissible number of defectives is specified for each lot size.
• Sub-sample sizes are also defined for detailed tests.

Table: Sample Size & Criteria for Conformity

Procedure Summary:

• Select samples randomly from each lot.
• Test samples for specified properties.
• If defectives ≤ permissible number, lot is accepted.
• If defectives exceed permissible number, lot is rejected.

Additional Notes:

• Sampling ensures quality control without testing entire lot.
• Sub-samples are used for specialized tests (e.g., dimensional checks).
• Refer to Annex B for detailed sampling methodology.

flowchart TD
    A[Start: Lot received] --> B[Determine Lot Size]
    B --> C{Lot Size category}
    C -->|Up to 150| D[Sample 8 items]
    C -->|151-300| E[Sample 13 items]
    C -->|301-500| F[Sample 20 items]
    C -->|501-1000| G[Sample 32 items]
    C -->|1001-3000| H[Sample 50 items]
    C -->|Above 3000| I[Sample 80 items]
    D --> J[Test samples]
    E --> J
    F --> J
    G --> J
    H --> J
    I --> J
    J

IS 2692: Hydraulic Pressure Test Key Points

Hydraulic Pressure Test (Clause 10.1)

• Test Pressure: ≥ 1.5 MPa (15 bar)
• Duration: 2 minutes
• Acceptance: No leakage or sweating during test

Sampling (Clause 2.1.1)

• Number of ferrules tested per Table 4, Column 4
• Samples selected from ferrules that already conform to B-2.1 requirements

Key Dimensions for Ferrule Components (Table 3, Clause 6.1)

Plug Thread Tolerances

• Screw threads H and P: Medium class bolt tolerance
• Nut and bolt threads: medium class tolerances per IS 4218

Summary Flowchart: Hydraulic Pressure Test Process

flowchart TD
    A[Select Ferrules per Table 4] --> B[

IS 2692: Marking & Key Specifications Summary

Clause 11.1 - Marking Requirements:

• Each ferrule must be legibly marked with:
  • Source of manufacture
  • Nominal size

Key Dimensions for Ferrule Components (Table 2 Highlights)

Key Fabrication (Clause 8.5)

• Material: Round malleable casting or forged mild steel bar
• Shape: 'T' form with one end a ring having square slot matching ferrule cap head
• Length of 'T' branch (min):

Materials (Table

IS 2692 Annex A - List of Referenced Indian Standards

Annex A provides essential Indian Standards referenced for ferrules used in water services, ensuring compatibility and quality. Key standards include:

Important Notes from Clause 16.3 (Marking & Dimensions)

• Washer plate thickness (M)
• Rubber/leather washer thickness when new (N)
• Lift of washer plate (with washer)
• Outside diameter of copper washer (Q)
• Screw thread tolerances: Medium class for H and P threads
• Washer plate stem: Should fit smoothly in the plug

Typical Ferrule Dimensions (Nominal size in mm)

IS 2692 Annex B: Sampling and Criteria for Conformity

Key Points from Annex B (Clause 9.1):

• Sampling is done per lot, tested separately for conformity.
• Lot sizes dictate sample size, permissible defectives, and sub-sample size.

Table B-1.1: Sample Size & Criteria for Conformity

Procedure Summary:

• Select samples randomly from each lot.
• Test all samples.
• If defectives ≤ permissible number, lot conforms.
• Otherwise, lot is rejected.

Additional Notes:

• Sub-samples are smaller groups for specific tests.
• Sampling follows random selection for representativeness.
• This method aligns with standard acceptance sampling plans ensuring quality control.

flowchart TD
    A[Start: Identify Lot Size] --> B{Lot Size Range}
    B -->|Up to 150| C[Sample 8, Permissible Defectives 0]
    B -->|151-300| D[Sample 13, Permissible Defectives 0]
    B -->|301-500| E[Sample 20, Permissible Defectives 1]
    B -->|501-1000| F[Sample 32, Permissible Defectives 2]
    B -->|1001-3000| G[Sample 50, Permissible Defectives 3]
    B -->|3001+| H[Sample 80, Permissible Defectives 5]
    C --> I[Test Samples]
    D --> I