copper alloy waste fittings for wash basins and sinks

IS 2963 - Scope Summary & Key Specifications

Scope (Clause 3.1 & 0.4)

• Applies to waste fittings for wash-basins and sinks.
• References latest Indian Standards for materials.
• Harmonized with international standards and Indian field practices.
• Rounding off values per IS 2:1960 rules.

Sampling & Conformity (Clause 7.2, Table 1)

• Sampling is done in two stages with cumulative acceptance/rejection numbers.

Dimensional Specifications (Clause 4.2)

• Waste fittings for wash-basins and sinks must conform to dimensions in Fig. 1 & Fig. 2 respectively.
• Threads conform to IS 554:1975 for pressure-tight pipe threads.
• Example:
  • Hex width across flats (A/F): 45 mm
  • Parallel pipe thread diameter: 32 mm
  • Minimum flange chamfered area: 5 cm²

Important References

• IS 554:1975 — Pipe threads for pressure-tight joints.
• IS 2:1960 — Rules for rounding off numerical values.

flowchart LR
    A[Scope: Waste Fittings] --> B[Materials per latest IS]
    B --> C[Sampling & Conformity]
    C --> D[Lot Size & Sample Size Table]
    A --> E[Dimensions]
    E --> F[Wash Basin Fittings - Fig 1]
    E --> G[Sink Fittings - Fig 2]
    F & G --> H

IS 2963 - Materials: Key Specifications & Tables

1. Materials Reference

• Clause 3.1 refers to the latest Indian Standards for materials used in fittings.
• Materials must comply with relevant IS codes (e.g., IS 1239 for steel pipes, IS 3589 for cast iron, etc.).
• Materials should be tested and certified per IS standards for quality, strength, and durability.

2. Sampling & Conformity (Clause 7.2 & 7.3)

• Sampling size depends on lot size (see Table 1 below).
• Two-stage sampling: First and Second samples with acceptance (a) and rejection (r) numbers.
• Lot acceptance criteria based on defectives ≤ acceptance number; rejection if defectives ≥ rejection number.

• If defectives fall between acceptance and rejection numbers in the first sample, a second sample is tested and combined results decide conformity.

3. Rounding Off

• Test or calculated values are rounded per IS 2-1960 rules, maintaining the same significant figures as specified.

Summary

• Use latest IS codes for material specs.
• Follow sampling plan (Table 1) for quality control.
• Apply acceptance/rejection criteria strictly.
• Round off test results per IS 2.

flowchart TD
    A[Lot Size] --> B{Sample Size from Table 1}
    B --> C[First Sample]
    C --> D{Defect

IS 2963: Manufacture and Workmanship - Key Points

1. Quality Requirements (Clause 3.1)

• Fittings must be sound, free from:
  • Laps
  • Blow-holes
  • Pitting
  • Other manufacturing defects
• Surfaces (internal & external) must be clean and smooth.
• Cast fittings must not be burnt, plugged, stopped, or patched.
• Body and nut must be truly machined for smooth movement.

2. Sampling and Criteria for Conformity (Clause 7.2 & 7.3)

• If defectives ≤ acceptance no. → Lot conforms.
• If defectives ≥ rejection no. → Lot rejected.
• If defectives between acceptance and rejection → Test second sample and combine results.

3. Rounding Off (Clause 0.5)

• Final values must be rounded off per IS 2:1960 rules.
• Retain the same number of significant digits as specified.

flowchart TD
    A[Select Lot] --> B{Lot Size?}
    B -->|≤150| C[Sample 13]
    B -->|151-300| D[Sample 20]
    B -->|301-500| E[Sample 20]
    B -->|501-1000| F[Sample 50]
    B -->|1001-3000| G[Sample 80]
    B -->|>3000| H[Sample 125]
    C --> I{Defectives ≤ a

IS 2963: Nominal Sizes and Dimensions of Waste Fittings

1. Nominal Sizes (Clause 4.1)

• Wash-basins: 32 mm nominal size
• Sinks: 50 mm nominal size

2. Dimensions (Clause 4.2)

• Waste fittings for wash-basins conform to Fig. 1 dimensions.
• Waste fittings for sinks conform to Fig. 2 dimensions.
• External screw thread on body & internal thread on nut follow IS 554-1975 (parallel pipe threads for pressure-tight joints).

3. Key Dimensional Details (from Fig. 1 for Wash-basins)

• Hex width across flats (A/F): 45 mm
• Pipe thread size: 32 mm parallel
• Minimum flange chamfered area: 5 cm²
• Hole number and size are indicative.

4. Quality Requirements (Clause 3.1)

• Fittings must be free from defects (laps, blowholes, pitting).
• Surfaces must be smooth and clean.
• Body and nut must be machined for smooth nut movement.

Summary Table: Nominal Sizes

flowchart LR
    A[Wash-basins] -->|32 mm| B[Waste fitting]
    C[Sinks] -->|50 mm| D[Waste fitting]
    B & D --> E[External & Internal Threads]
    E --> F[IS 554-1975 Compliance]

For detailed dimensional drawings, refer to Figures 1 & 2 in IS 2963.

IS 2963 - Finish Specifications for Waste Fittings

• Plating Requirement (Clause 5.1):
  Waste fittings shall be nickel-chromium plated.
  Minimum plating thickness: Service Grade No. 2 as per IS 4827-1968.
  The plating must allow a high polish finish that resists tarnishing and scaling.

• Marking (Clause 6.1):
  Each fitting must be marked with:

  • Manufacturer's name or trademark
  • Year of manufacture

• Thread Specifications (Clause 4.2):
  External and internal screw threads must comply with IS 554-1975 for pressure-tight pipe threads.

• Dimension Highlights (Figures 1 & 2):

  • Wash-basin waste fitting: Hex width A/F 45 mm, 32 mm parallel pipe thread
  • Sink waste fitting: Hex width A/F 65 mm, 50 mm parallel pipe thread

Summary Table: Finish Requirements

flowchart LR
    A[Waste Fitting] --> B[Nickel-Chromium Plating]
    B --> C{Thickness ≥ Grade 2 (IS 4827)}
    C --> D[High Polish Finish]
    D --> E[Resists Tarnish & Scaling]
    A --> F[Marking]
    F --> G[Manufacturer Name]
    F --> H[Year of Manufacture]

This ensures durability, aesthetics, and compliance with Indian standards for sanitary waste fittings.

IS 2963 - Marking Specifications Summary

• Clause 6.1.1: Each waste fitting may be marked with the Standard Mark of BIS.
• The Standard Mark indicates compliance with the Indian Standard, ensured by:
  • Manufacturer's inspection, testing, and quality control.
  • Supervision and periodic checks by BIS.
• Use of the Standard Mark is governed by the BIS Act 1986 and related rules.
• Manufacturers must obtain a license from BIS to use the Standard Mark.

Key Points on Marking:

Sampling & Conformity (Clause 7.3):

• Samples are taken to check workmanship, finish, and dimensions.
• Acceptance/Rejection criteria based on number of defectives in samples.
• If defectives ≤ acceptance number (a): Lot accepted.
• If defectives ≥ rejection number (r): Lot rejected.
• If defectives between a and r: Second sample tested.

Rounding Off (Clause 0.5):

• Final values (test results) rounded as per IS 2:1960 rules.
• Number of significant figures retained same as specified values.

flowchart LR
    A[Waste Fitting] --> B{Marking}
    B --> |May have| C[Standard Mark]
    C --> D[Assures compliance to IS 2963]
    D --> E[Manufacturer controls quality]
    D --> F[BIS supervises & tests]
    B --> G[No Mark]

For detailed licensing and marking procedures, contact BIS offices listed in the standard.

IS 2963 - Sampling and Criteria for Conformity (Clause 7.2)

Sampling depends on lot size; use Table 1 for sample size and acceptance/rejection criteria:

• Second sample (if needed) doubles the sample size and adjusts acceptance/rejection numbers accordingly.
• If defects ≤ acceptance number → lot accepted.
• If defects ≥ rejection number → lot rejected.
• If defects between acceptance and rejection → second sample tested.

Note: Final test results must be rounded per IS 2-1960 rules.

flowchart TD
    A[Start: Select Lot Size] --> B{Lot Size?}
    B -->|Up to 150| C[Sample 13 fittings]
    B -->|151-300| D[Sample 20 fittings]
    B -->|301-500| E[Sample 20 fittings]
    B -->|501-1000| F[Sample 50 fittings]
    B -->|1001-3000| G[Sample 80 fittings]
    B -->|Above 3000| H[Sample 125 fittings]
    C --> I{Defects ≤ Acceptance No.?}
    D --> I
    E --> I
    F --> I
    G --> I
    H --> I
    I -->|Yes| J[Accept Lot]
    I -->|No| K{Defects ≥ Rejection No.?}
    K -->|Yes| L[Reject