waste plug and its accessories for sinks and wash-basins
1979 Edition

Summary of IS 3311 Scope and Specifications

• Coverage: Specifies materials, manufacturing processes, and marking requirements for waste plugs, chains, and stays for sinks and wash-basins.
• Marking Requirements: Clause 5.1.1 mandates the use of the ISI Certification Mark on all waste plugs, chains, and stays to guarantee quality and regulatory compliance.
• Material and Dimensions:
  • Dimensions of the metallic part of screw type stays (optional):

    Size	Wash Basin (mm)	Sink (mm)
    A	42	60

• Units: SI units in accordance with IS standards (e.g., meters for length, newtons for force).
• Rounding Off: Testing and calculation results are rounded following IS:2-1960 for consistency.

This standard ensures dimensional accuracy, product quality, and adherence to Indian plumbing engineering protocols.

flowchart LR
    WP[Waste Plug] --> CH[Chain]
    CH --> ST[Stay]
    ST --> MK[ISI Certification Marking]
    MK --> QC[Assurance of Quality & Compliance]

Refer to Fig. 1 in IS 3311 for typical configurations and dimensions of waste plugs and chain stays.

IS 3311 Material Requirements and References

• Chain Stay Materials (Clause 2.3):

  • Chain stays must be manufactured as either bolt or screw type.
  • Utilization of brass or corrosion-resistant alloys is mandatory.
  • The shank must be fully threaded extending to the underside of the flange.

• Referenced Material Standards:

  • Copper and brass alloys per specifications for waste fittings.
  • Phosphor bronze wire standards for engineering applications.
  • Electroplated coatings involving nickel and chromium for copper alloys.
  • Technical supply conditions for wood screws.
  • ISO metric screw thread standards detailing diameter and pitch.

• Marking (Clause 5.1.1):

  • ISI Certification Mark is compulsory on waste plugs, chains, and stays.
  • This ensures adherence to quality control via inspection and testing.

• Units and Terminology (SI Units):

  • Stress and pressure measured in pascals (Pa = N/m²).
  • Force measured in newtons (N = kg·m/s²).
  • Energy measured in joules (J = N·m).

Material Overview Table

flowchart TD
    MAT[Materials] --> CS[Chain Stay: Brass/Corrosion Resistant]
    MAT --> WC[Waste Plug & Chain: ISI Certified]
    CS --> FT[Fully Threaded Shank]
    WC --> IS[Conforms to IS 771, IS 2556]

For detailed mechanical properties and dimensional data, consult the specific referenced Indian Standards.

Construction and Size Specifications per IS 3311

1. Waste Plug Size Requirements (Clause 1.1.1)

• Dimensions standardized for compatibility with waste fittings as per IS 2963-1978.

2. Bolt Stay Dimensions (Clause 2.3.1)

• The flange diameter must not be less than 12 mm.

3. Metallic Portion of Screw Type Stay (Clause 6.5)

• All measurements are expressed in millimeters.
• Typical waste plug, chain, and stay illustrations are provided in Fig. 1 of IS 3311.

4. Marking Requirements (Clause 5.1.1)

• Components may carry the ISI Certification Mark to indicate compliance.

Additional Considerations:

• Use ISO metric screw threads to maintain interoperability.
• Manufacturing processes and materials must be in accordance with IS guidelines to ensure durability and proper fitting.
• Dimensions are designed to ensure interchangeability with standard waste fittings.

flowchart LR
    PLG[Waste Plug Dimensions] --> STD[IS 2963-1978]
    FLG[Bolt Flange Diameter] --> MIN12[Minimum 12 mm]
    STY[Screw Type Stay] --> WB42[Wash Basin: 42 mm]
    STY --> SK60[Sink: 60 mm]
    MRK[Marking] --> ISI[ISI Certification Mark]

This section summarizes the key construction and dimension requirements; detailed designs should refer to IS 2963 and related screw thread standards.

IS 3311 Requirements on Finishing and Marking

1. Rounding Off of Values (Clause 0.4)

• Test results and calculated values must be rounded according to IS 2:1960.
• The number of significant figures in rounded results should correspond with those specified in the standard.

2. Marking Protocol (Clause 5.1.1)

• Waste plugs, chains, and stays may bear the ISI Certification Mark.
• The ISI mark certifies conformity with quality, inspection, and testing under Indian Standards Institution regulations.
• Usage of the ISI mark is regulated by the Indian Standards Institution (Certification Marks) Act.

3. Typical Dimensions for Screw Type Stay (Clause 6.5)

• All dimensions are in millimeters.
• Refer to Fig. 1 in IS 3311 for visual details of typical waste plug assemblies.

Process Overview for Finishing and Marking

flowchart TD
    MAN[Manufacturing] --> TST[Testing]
    TST --> RND[Rounding Results (IS 2:1960)]
    RND --> MRK[Marking with ISI Certification]
    MRK --> FNL[Final Product Release]

Note: Proper finishing and marking ensure product reliability and traceability in accordance with IS 3311.

IS 3311 Performance Standards - Overview

While explicit formulas or tables for performance are not detailed in the standard text provided, general requirements include:

1. Rounding Protocol (Clause 0.4)

• Test and calculation results must be rounded following IS 2-1960.
• The number of significant digits must align with those specified in the standard.

2. Marking (Clause 5.1.1)

• Waste plugs, chains, and stays must display the ISI Certification Mark to confirm compliance.

3. General Performance Expectations

• Material Strength: Components should meet minimum tensile, compressive, and shear strength requirements.
• Durability: Adequate resistance to corrosion, wear, and environmental degradation.
• Dimensional Tolerance: Must comply with limits set by IS specifications.
• Safety Factors: Usually range from 1.5 to 2.0 depending on the application context.

Rounding Illustrations (IS 2-1960):

Compliance Verification Flow

flowchart TD
    RES[Test or Analysis Result] --> RNG{Round per IS 2-1960}
    RNG --> CMP[Compare to Specified Value]
    CMP --> DEC{Is it Conforming?}
    DEC -- Yes --> ACC[Accept Product]
    DEC -- No --> REJ[Reject or Retest]

For detailed performance measures, consult the specific clauses of IS 3311 and related standards concerning material properties and testing.

Testing Protocols According to IS 3311

1. Rounding of Test Data (Clause 0.4)

• All final test or analytical results must be rounded as per IS 2:1960.
• The retained significant digits should match the precision of the standard's specified values.

2. Marking Requirements (Clause 5.1.1)

• Waste plugs, chains, and stays may display the ISI Certification Mark.
• The mark certifies adherence to quality, inspection, and testing criteria monitored by the ISI.

3. Testing Methodology

• Tests must be conducted using standardized procedures to ensure accuracy and repeatability.
• Results are to be recorded using SI units consistent with those specified in IS 3311.

4. Units and Symbols

5. Additional Information

• Testing equipment and methods should align with relevant IS standards applicable to plumbing hardware.
• Use of the ISI mark is governed by the Indian Standards Institution's certification regulations.

flowchart LR
    PS[Prepare Test Sample] --> PT[Perform Test]
    PT --> RC[Record Data]
    RC --> RO[Round Results (IS 2:1960)]
    RO --> CV[Compare with Specification]
    CV --> DEC{Conforms?}
    DEC -- Yes --> MK[Apply ISI Mark]
    DEC -- No --> RT[Reject or Conduct Retest]

For detailed testing methods, refer to the pertinent IS codes covering cement, concrete, and sanitary hardware.

Summary of Chain Stay Requirements in IS 3311

Material and Construction Details

• Type: Chain stays shall be either bolt or screw type (Clause 2.3).
• Material: Must be brass or an equivalently corrosion-resistant alloy; shank fully threaded up to the flange underside.
• Chromium Plating: Minimum Service Grade No. 2 as specified in IS 4827-1968 (Clause 4.1).

Chain Details (Clause 2.2)

• Material: Phosphor bronze or brass wire complying with IS 7608-1975 or IS 2704-1964.
• Wire Diameter: At least 1.80 mm.
• Link Dimensions: Brazed oval links approximately 13 mm long.
• Chain Length: Minimum 300 mm excluding shackles.
• Attachment: One chain end connects to the waste plug shackle; the other connects to the stay shackle.

Dimensions of Metallic Portion (Clause 6.5)

Important Notes:

• All dimensions are expressed in millimeters.
• Chain and stays must resist corrosion.
• The stay shank is fully threaded to ensure secure installation.

graph LR
    WP[Waste Plug Shackle] -- Chain --> CH[Chain Links (min 300 mm)]
    CH -- Chain --> ST[Stay Shackle]
    ST -- Threaded Shank --> FL[Under Flange]

This guarantees a sturdy, corrosion-resistant connection between plug and stay as per IS 3311.

Assembly Instructions for Screw Type Stay (IS 3311)

Key Parameters (Clauses 6.5 and related):

• Units are in millimeters.
• Minimum bolt flange diameter (Clause 2.3.1): 12 mm.
• Minimum screw flange diameter (Clause 2.3.2): 12 mm.
• Minimum screw shank length (Clause 2.3.2): 20 mm.
• Thread specification: No. 11 wood screw thread according to IS: 451-1972.

Marking (Clause 5.1.1):

• Waste plugs, chains, and stays should bear the ISI Certification Mark verifying compliance.

Dimension Summary for Screw Type Stay:

Notes:

• These dimensions are typical and should be verified against actual product specifications.
• ISI marking ensures conformity with Indian Standards Institution regulations.

flowchart LR
    AS[Waste Plug Assembly] --> ST[Screw Type Stay]
    ST --> DM{Dimensions}
    DM --> FL[Flange Diameter ≥ 12 mm]
    DM --> SL[Shank Length ≥ 20 mm]
    DM --> TH[Thread: No. 11 Wood Screw]
    ST --> WB[Size A: 42 mm (Wash Basin)]
    ST --> SK[Size A: 60 mm (Sink)]

This section outlines typical assembly details for screw-type stays per IS 3311.

Compliance Guidelines and Reference Standards in IS 3311

1. ISI Certification Mark (Clause 5.1.1)

• Waste plugs, chains, and stays may be marked with the ISI Certification Mark.
• This mark guarantees compliance with the standard under a rigorous system of inspection, testing, and quality control.
• The Indian Standards Institution (Certification Marks) Act regulates ISI mark usage.

2. Units and Symbols (SI System)

• Supplementary units include radian (rad) for plane angle and steradian (sr) for solid angle.
• Derived units include:
  • Force: Newton (N) = 1 kg·m/s²
  • Pressure/Stress: Pascal (Pa) = 1 N/m²
  • Energy: Joule (J) = 1 N·m
  • Power: Watt (W) = 1 J/s

3. Rounding Off (Clause 0.4)

• Final test or calculation results must be rounded off as per IS 2-1960.
• Significant figures should match those specified in the standard.

4. Coordination and References

• The standard aligns with international norms and Indian field practices.
• Related standards include:
  • ISO metric screw threads (Part II)
  • Technical supply conditions for wood screws
  • Specifications for electroplated coatings

Compliance Workflow

flowchart TD
    PROD[Product Manufacturing] --> INSP[Inspection & Testing]
    INSP --> DEC{Meets IS 3311 Criteria?}
    DEC -- Yes --> ISI[Grant ISI Certification Mark]
    DEC -- No --> RWRK[Rework or Reject]
    ISI --> SURV[Ongoing ISI Quality Surveillance]

For full details, consult IS 3311 and associated Indian Standards documentation.