Glazed Fire-clay Sanitary Appliances, Part VI: Specific Requirements of Bed Pan Sinks
1979 Edition

IS 771 Part 6 (1979) - Overview: Essential Specifications

1. Dimensional Tolerances (Clause 2.4.2)

• For dimensions below 50 mm: ± 2 mm permitted
• For dimensions 50 mm and above: ± 4% of the dimension allowed

2. Rounding Rules (Clause 0.3)

• Final calculated or tested values shall be rounded following IS: 2-1960.
• The number of significant digits shall match those indicated in the standard.

Tolerance Summary Table

Notes:

• These tolerances maintain precise dimensional adherence.
• Rounding ensures uniformity in reporting measurement outcomes.

flowchart TD
    DimSize[Dimension Size] -->|< 50 mm| TolSmall[± 2 mm]
    DimSize -->|≥ 50 mm| TolLarge[± 4%]
    FinalVal[Final Value] --> Rounded[Rounded per IS:2-1960]
    Rounded --> SigFig[Match significant figures]

This framework establishes dimensional accuracy and result consistency for IS 771 Part 6.

IS 771 Part 6 - Scope: Dimensional and Tolerance Specifications

• Coverage: Defines acceptable dimensions and tolerance limits for components in reinforced concrete construction related to bed pan sinks.

Key Points from Clause 2.4:

Rounding of Results (Clause 0.3):

• Adhere to rounding per IS 2-1960.
• Maintain the number of significant figures as in the standard's values.

Summary:

• Employ ±2 mm tolerance for smaller dimensions.
• Apply ±4% tolerance for larger dimensions.
• Follow IS 2 rounding rules for consistent test data.

flowchart LR
    Dim[Dimension] --> Check{Is it < 50 mm?}
    Check -- Yes --> SmallTol[± 2 mm]
    Check -- No --> LargeTol[± 4%]

This ensures dimensional compliance with IS 771 Part 6.

IS 771 Part 6: Summary of Core Requirements

• Rounding Practices (Clause 0.3): Test and calculation results must be rounded according to IS: 2-1960.

  • The number of significant digits shall correspond to those specified.

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

• Dimensional Controls (Clause 2.4 & 2.4.2): Permissible tolerances are as follows:

This ensures consistent dimensional accuracy and quality assurance for bed pan sinks under IS 771 Part 6.

IS 771 Part 6 – General Specifications and Tolerances

1. Compliance Requirements (Clause 2.1)

• Materials, manufacturing processes, testing, sampling, and inspections must conform to IS 771 (Part 1)-1979.

2. Dimensional Limits (Clause 2.4 & 2.4.2)

• Allowed dimensional deviations:
  • For measurements below 50 mm: ± 2 mm
  • For 50 mm and above: ± 4% of the size

3. Result Rounding (Clause 0.3)

• Round final test outcomes as per IS 2-1960.
• Maintain the specified number of significant digits.

Dimensional Tolerance Table

This standardizes manufacturing and quality verification for bed pan sinks.

IS 771 Part 6: Pattern and Dimension Specifications for Bed Pan Sinks

• Standard Dimensions: The bed pan sink measures 600 mm by 450 mm (Clause 2.2, illustrated in Fig. 1).

• Permissible Tolerances (Clause 2.4.2):

• Material Composition: Constructed from fire-clay as described in Clause 1.1.

• Additional Details:

  • Dimensions are expressed in millimeters.
  • Optional flange section indicated in Fig. 1 (Section YY).
  • Numerical values are rounded following IS regulations.

flowchart LR
    Sink[Bed Pan Sink] --> Size[600 × 450 mm]
    Sink --> ToleranceCheck[Tolerances]
    ToleranceCheck --> Less50{Dimension < 50 mm}
    ToleranceCheck --> More50{Dimension ≥ 50 mm}
    Less50 --> TolSmall[± 2 mm]
    More50 --> TolLarge[± 4%]

This ensures dimensional precision and interchangeability in production.

IS 771 Part 6: Construction Guidelines

• Compliance with General Requirements (Clause 2.1): Materials, fabrication procedures, testing, sampling, and inspection must meet the provisions of IS 771 Part 1 (1979).

• Dimensional Tolerances (Clauses 2.4 & 2.4.2): Permitted dimensional deviations include:

• Construction Requirements (Clause 2.3): Fabrication methods should ensure compliance with dimensional tolerances and quality standards.

Tolerance Summary

This guarantees adherence to quality and dimensional standards during manufacturing.

IS 771 Part 6: Dimensional and Tolerance Requirements for Bed Pan Sinks

1. Dimensions (Clause 2.4.1)

• The sink dimensions must strictly match those illustrated in Fig. 1 of the standard.

2. Allowed Deviations (Clause 2.4.2)

3. Rounding (Clause 0.3)

• Measured or calculated results should be rounded as per IS 2-1960.
• The number of significant figures must match that specified.

Quick Reference Table

These requirements ensure precision and quality in manufacturing bed pan sinks.

IS 771 Part 6 – Marking Requirements for Dimensions and Tolerances

• Rounding of Values (Clause 0.3): Test or calculation results shall be rounded following IS 2-1960.

  • Preserve the number of significant figures as per the standard.

• Dimensional Tolerances (Clause 2.4.2): For dimensions depicted in Fig. 1:

• Purpose: To maintain consistency and precision when marking dimensions on bed pan sinks as per IS 771 Part 6 (1979).

flowchart LR
    DimMeasure[Measured Dimension] --> CheckSize{Is it < 50 mm?}
    CheckSize -- Yes --> TolSmall[± 2 mm]
    CheckSize -- No --> TolLarge[± 4%]
    TolSmall & TolLarge --> RoundOff[Apply IS 2-1960 rounding]

Follow these guidelines to confirm compliance in marking.

IS 771 Part 6: Sampling and Inspection Guidelines

1. General Instructions (Clause 2.1)

• Sampling and inspection processes must adhere to IS 771 Part 1 (1979).
• Materials, fabrication, and testing methods should follow the general rules set out in Part 1.

2. Dimensional Checks (Clause 2.4)

• Tolerances allowed for dimensions (referencing Fig. 1):

3. Rounding Standards (Clause 0.3)

• Final test measurements must be rounded as per IS 2:1960.
• The number of significant digits must reflect those specified.

Tolerance Summary Table

This procedure ensures quality control and consistent inspection outcomes.

flowchart TD
    Inspection[Sampling & Inspection] --> GenReq[Material & Manufacture per IS 771 Part 1]
    GenReq --> Measure[Measure Dimensions]
    Measure --> SizeCheck{Is dimension < 50 mm?}
    SizeCheck -- Yes --> TolSmall[± 2 mm]
    SizeCheck -- No --> TolLarge[± 4%]
    TolSmall & TolLarge --> ComplianceCheck[Verify conformity]
    ComplianceCheck --> RoundResults[Round off per IS 2:1960]

IS 771 Part 6 (1979) – Testing Procedures Overview

• Reference: Testing methodologies conform to IS 771 Part 1 (1979), which details material standards, manufacturing processes, sampling, inspection, and test protocols.

• Rounding of Test Data: Follow IS 2:1960 for rounding:

  • Round final measurements to match the significant figures of the specified values.
  • Ensures consistency and comparability across test results.

• Common Tests Included:

  • Tensile strength evaluation
  • Bending resistance tests
  • Hardness assessment
  • Chemical composition analysis
  • Dimensional verification

• Sampling: Samples must be representative per IS 771 Part 1 to validate testing.

Rounding Examples (IS 2:1960)

For detailed test procedures and rounding rules, consult IS 771 Part 1 and IS 2:1960.