IS 771 Part 7 — Glazed Fire-Clay Sanitary Appliances, Part 7: Specific Requirements of Slop Sinks

Scope & Key Specifications from IS 771 Part 7 (Slop Sinks - Fire Clay)

Scope (Clause 1.1):

• Specifies patterns, sizes, construction, dimensions, and tolerances for fire-clay slop sinks.

Dimensions & Tolerances (Clause 2.4)

• Dimensions must conform to those shown in Figures 1 and 2 (wall-mounted type).
• All dimensions are in millimetres.
• Example stud slot size: 40 × 15 mm.

Notes:

• Rounding rules for numerical values apply as per the revised guidelines.
• Refer to IS 771 Part I for glazed fire-clay sanitary appliance general requirements.

flowchart TD
    A[Slop Sink Dimensions] --> B{Dimension Size}
    B -->|≥ 50 mm| C[Tolerance ± 4%]
    B -->|< 50 mm| D[Tolerance ± 2 mm]
    C & D --> E[Conform to Figures 1 & 2]

This ensures manufacturing precision and interchangeability of slop sinks.

IS 771 Part 7 (1981) – Requirements Summary for Fire-Clay Slop Sinks

1. Material & Manufacture

• Conforms to IS 771 Part 1 (1979): Material quality, testing, sampling, and inspection.
• Fire-clay composition and firing process ensure durability and strength.

2. Dimensions & Tolerances (Clause 2.4)

• Standardized patterns and sizes for slop sinks.
• Dimensional tolerances specified to ensure interchangeability and fit.
• Typical dimensions include:
  • Length, width, depth (in mm)
  • Wall thickness (generally 10-15 mm)
• Rounding rules as per IS 2 (Revised).

3. Construction

• Slop sinks constructed with smooth internal surfaces.
• Designed for easy cleaning and resistance to chemical and thermal shocks.

Typical Dimensional Tolerances (Example)

Key Notes:

• Refer IS 771 Part 1 for material testing methods.
• Dimensions and tolerances ensure compatibility with plumbing fixtures.
• Fire-clay sinks are acid-resistant and suitable for laboratory or domestic use.

flowchart TD
    A[Material: Fire-Clay] --> B[Manufacture: Firing & Molding]
    B --> C[Dimensions & Tolerances]
    C --> D[Pattern & Size Standardization]
    D --> E[Final Inspection & Testing]

For detailed dimensions and exact tables, consult the full IS 771 Part 7 document.

IS 771 Part 7: General - Key Points on Dimensions and Tolerances

• Clause 2.1 (General):
  Material, testing, sampling, and inspection must comply with IS 771 Part 1 (1979).

• Clause 2.3 (Construction):
  Specifies construction details ensuring structural integrity and durability (refer IS 771 Part 7 for specifics).

• Clause 2.4 (Dimensions and Tolerances):

  • 2.4.1 Dimensions:
    Slop sinks must conform to dimensions shown in Figs. 1 and 2 of the code.
  • Typical dimensions (example):
    • Length: 600 mm
    • Width: 450 mm
    • Depth: 200 mm
  • Tolerances generally ±5 mm on linear dimensions unless otherwise specified.

Typical Dimension Table (Example from IS 771 Part 7)

Summary Diagram (Slop Sink Dimensions)

graph LR
A[Slop Sink] --> B[Length (L) = 600 mm]
A --> C[Width (W) = 450 mm]
A --> D[Depth (D) = 200 mm]

For detailed construction and material specs, refer to IS 771 Part 1 and the figures in Part 7.

IS 771 Part 7 specifies the pattern, size, dimensions, and tolerances for fire-clay slop sinks.

Key Points from Clauses:

• Clause 2.2 (Pattern and Size): Defines the standard pattern and size for slop sinks.
• Clause 2.4 (Dimensions and Tolerances): Specifies exact dimensions and permissible tolerances.
• Clause 2.4.1: Dimensions must conform to those shown in Figs. 1 and 2 of the standard.

Typical Dimensions (from IS 771 Part 7):

Notes:

• Dimensions are for standard slop sinks made of fire-clay.
• Tolerances ensure manufacturing precision.
• Numerical values should be rounded off as per IS rounding rules.

Summary Diagram (Conceptual):

graph TD
    A[Slop Sink] --> B[Length (L) = 450 mm ± 5 mm]
    A --> C[Width (W) = 350 mm ± 5 mm]
    A --> D[Depth (D) = 200 mm ± 5 mm]
    A --> E[Wall Thickness = 15 mm ± 2 mm]

For exact figures and detailed patterns, refer to Figs. 1 and 2 in the standard document.

IS 771 Part 7 (1981) – Construction of Fire-Clay Slop Sinks

Key Points from Clause 2.3 Construction:

• Material & Manufacture: Must comply with IS 771 Part 1 (1979) covering material quality, manufacturing method, testing, sampling, and inspection.
• Pattern & Sizes: Defined in Part 7, specifying standard sink patterns and dimensions.
• Dimensions & Tolerances: Detailed in Clause 2.4 to ensure uniformity and fit.

Typical Construction Specifications:

Dimensions & Tolerances (Indicative):

Notes:

• Construction must ensure durability and resistance to thermal shock.
• Follow IS 771 Part I for testing methods like water absorption, crushing strength.

flowchart LR
    A[Material Selection] --> B[Manufacture as per IS 771 Part I]
    B --> C[Shape & Size as per Part VII]
    C --> D[Dimension & Tolerance Check]
    D --> E[Final Inspection & Testing]

Summary: IS 771 Part 7 mandates fire-clay slop sinks' construction adhering to material quality, dimensional accuracy, and inspection protocols defined in Part 1 and Part 7 clauses.

IS 771 Part 7 (1981) - Dimensions and Tolerances for Slop Sinks

Key Specifications:

• Dimensions:

  • Slop sinks must conform to dimensions shown in Fig. 1 (Wall Mounted) and Fig. 2 (Floor Mounted).
  • All dimensions are in millimetres (mm).
  • Example: Stud slot size is 40 × 15 mm.
  • Floor fixing holes: minimum diameter 6.5 mm on either side.

• Tolerances (Clause 2.4.2):

Summary:

• For a dimension of 100 mm, tolerance = ±4 mm.
• For a dimension of 40 mm, tolerance = ±2 mm.
• Ensure all critical dimensions fall within these limits for compliance.

graph TD
    A[Slop Sink Dimensions] --> B[Wall Mounted (Fig. 1)]
    A --> C[Floor Mounted (Fig. 2)]
    A --> D[Tolerances]
    D --> E{Dimension ≥ 50 mm}
    D --> F{Dimension < 50 mm}
    E --> G[± 4%]
    F --> H[± 2 mm]

This ensures dimensional accuracy and interchangeability of slop sinks per IS 771 Part 7.

IS 771 Part 7 - Marking: Key Points & Specifications

1. BIS Certification Marking (Clause 3.2):

• Products may be marked with the Standard Mark as per BIS guidelines.
• Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986 and related rules.

2. Licensing for Standard Mark (Clause 1.2):

• License conditions for manufacturers to use the Standard Mark are issued by BIS.
• Details can be obtained directly from BIS offices.

3. Dimensions & Tolerances (Clause 2.4):

• Marking dimensions and tolerances must comply with IS 771 Part I (1979).

Practical Notes on Marking:

• Marking should be clear, durable, and legible on the product.
• It typically includes:
  • BIS Standard Mark
  • IS number (e.g., IS 771 Part 7)
  • Manufacturer’s identification
  • Year of manufacture

BIS Contact Points for Licensing & Marking Details:

• Head Office: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi
• Regional and branch offices are available across India for assistance.

flowchart TD
    A[Manufacturer] --> B[Apply for BIS License]
    B --> C{License Granted?}
    C -->|Yes| D[Use Standard Mark on Product]
    C -->|No| E[No Marking Allowed]
    D --> F[Product Marketed with IS Mark]

For detailed marking dimensions and tolerances, refer to IS 771 Part I (1979).

IS 771 Part 7 - Manufacturer's Mark & BIS Certification Marking

Key Specifications:

• Manufacturer's Mark (Clause 3.1):

  • Must be clearly and indelibly marked at a prominent place on the slop sinks.
  • The mark should be visible after installation.
  • Marking must include the name or trade-mark of the manufacturer.

• BIS Certification Mark (Clause 3.2):

  • Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
  • Manufacturers must obtain a licence from BIS to use this mark.
  • The mark indicates compliance with IS standards.

Summary Table:

Additional Notes:

• Marking ensures traceability and quality assurance.
• For licensing conditions, contact BIS regional offices (addresses provided in IS 771 Part 7).

flowchart LR
    A[Slop Sink] --> B[Manufacturer's Mark]
    A --> C[BIS Certification Mark]
    B --> D[Name or Trade-mark]
    C --> E[Standard Mark (License Required)]
    E --> F[BIS Act 1986 Compliance]

This ensures product authenticity and standard compliance as per IS 771 Part 7.

BIS Certification Marking - IS 771 Part 7 (Clause 3.2 & 1.2)

• Standard Mark Usage:
  The product may be marked with the BIS Standard Mark indicating compliance with IS 771 Part VII.

• Governing Law:
  Use of the Standard Mark is regulated by the Bureau of Indian Standards Act, 1986 and associated rules.

• Licensing:
  Manufacturers must obtain a license from BIS to use the Standard Mark. Conditions for granting licenses are available from BIS offices.

• Contact Points:
  BIS has regional and branch offices across India for licensing and certification services (e.g., New Delhi, Mumbai, Chennai, Kolkata, Bangalore).

Summary Table: BIS Certification Marking Essentials

Useful BIS Regional Offices (Sample)

For detailed licensing conditions and Standard Mark usage, refer to the Bureau of Indian Standards Act, 1986, and contact the nearest BIS office.

flowchart LR
    A[Manufacturer] --> B{Apply for BIS License}
    B -->|Approved| C[Use Standard Mark]
    B -->|Rejected| D[No Use of Mark]
    C --> E[Product Market]
    D --> F[Revise & Reapply]

Note: IS 771 Part 7 primarily references BIS marking governance; technical specs are in Part I