Vitreous Sanitary Appliances (Vitreous China) - - Part 4: Specific Requirements of Wash Basins

IS 2556 (Part 4): Scope & Key Specifications for Wash Basins

This part covers vitreous china wash basins focusing on:

• Patterns & Sizes: Flat back and angle back basins with specific functional dimensions.
• Functional Dimensions (Table 2):

• Waste Outlet Hole Dimensions (Table 5):

• General Requirements: Refer IS 2556 (Part 1) for materials, tolerances, glazing, and testing.

Notes:

• All dimensions are in millimeters.
• Tolerances not specified here follow IS 2556 (Part 1).
• The standard includes load-bearing and overflow tests.
• Amendments updated flow rates and fixing provisions.

flowchart LR
    A[Wash Basin] --> B[Pattern: Flat Back / Angle Back]
    B --> C[Functional Dimensions: Length, Breadth, Height]
    A --> D[Waste Outlet Hole]
    D --> E[Diameter, Bevel, Seating Face

IS 2556 (Part 4): Referenced Standards & Key Specifications

Referenced Standards (as per IS 2556 Part 4:2004)

Note: IS 775:1970 (cast iron brackets) was deleted in the 2008 amendment.

Key Dimensions for Wash Basins (from Tables 3 & 4)

Tolerances & General Requirements

• When not specified, dimensional tolerances follow IS 2556 (Part 1).
• Final test values should be rounded per IS 2:1960 rules.

Illustration of Tap Hole Dimensions (simplified Mermaid.js)

graph LR
A[Wall/Skirting] -->|32-40

IS 2556 (Part 4): General Requirements for Wash Basins

Key Points from IS 2556 (Part 4):

• General Requirements (Clause 3):
  All terminology, materials, manufacturing, glazing, defects, minimum thickness, tolerances, performance, and test methods shall conform to IS 2556 (Part 1) (General Requirements).

• Tolerances (Clause 5.3):
  Where specific tolerances are not given, refer to IS 2556 (Part 1) for dimensional tolerances.

• Functional Dimensions (Clause 5.1 & Table 2):
  Wash basins must conform to specified sizes and dimensions:

Additional Notes:

• Load bearing and overflow tests are included in this revision.
• Final test values should be rounded as per IS 2:1960.
• Brackets/supports for wash basins (IS 775) references were deleted in this revision.
• Refer to IS 2556 (Part 1) for detailed material and manufacturing specifications.

Summary Diagram: Wash Basin Dimensions

graph TD
    A[Length (A)]
    B[Breadth (B)]
    C[Height (C)]
    WB[Wash Basin]

    WB --> A
    WB --> B
    WB --> C

For detailed construction, glazing

IS 2556 Part 4: Patterns and Sizes of Wash Basins

Key Specifications (Clause 4.1 & Table 1)

Functional Dimensions (Clause 5.1 & Table 2)

Important Notes:

• Connecting dimensions must be strictly followed for plumbing compatibility (Clause 5.2.1).
• Other patterns/sizes allowed only if mutually agreed; functional dimensions must still comply (Clause 4.2).

flowchart LR
    A[Wash Basin Patterns]
    A --> B[Flat Back]
    A --> C[Angle Back]

    B --> B1[660 × 460 (Surgeon's)]
    B --> B2[630 × 450]
    B --> B3[550 × 400]
    B --> B4[450 × 300]

    C --> C1[600 × 480]
    C --> C2[400 × 400 (Surgeon's)]

This summary ensures compliance with IS 2556 Part 4 for wash basin design and installation.

IS 2556 Part 4: Dimensions & Tolerances for Wash Basins

1. Functional Dimensions (Clause 5.1, Table 2)

2. Connecting Dimensions for Multiple Tap Holes (Clause 5.2.2, Table 3)

IS 2556 (Part 4) : 2004 — Construction and Finish Key Specifications

1. Construction & Finish (Clause 3 & 6)

• Conforms to IS 2556 (Part 1) for general requirements: materials, glazing, minimum thickness, tolerances, defects, and performance.
• Load bearing and overflow tests included.
• Wall thickness in tap hole zone: Max 18 mm.

2. Tap Hole Dimensions (Clause 5.2.3, Tables 3 & 4)

3. Fixing Dimensions for Wall Hung Basins (Clause 5.2.5, Table 6)

4. Additional Notes

• Fig. 7 specifies suitable pedestal fixing to floor.
• Rounding off

IS 2556 Part 4: Performance Requirements & Tests for Wash Basins

Key Performance Requirements:

• Water flow rate: 9.5 ± 0.5 l/min (Clause 9.5)
• Load Bearing Test (Clause 6.7): Wash basins must withstand specified loads without damage.
• Overflow Test: Ensures basin overflow capacity meets standards (details in Part 1).

Load Bearing Test (Clause 6.7):

• Apply a uniformly distributed load on the basin rim/support.
• Typical load: As per IS 2556 Part 1 or manufacturer specs (usually around 150 kg or as specified).
• Check for cracks, permanent deformation, or failure.

Fixing Provision (Fig. 7):

• Suitable pedestal fixing to floor must be provided for stability.
• Use brackets/supports as per updated specs (IS 775 reference deleted).

Rounding Off Results:

• Follow IS 2:1960 for rounding test results to the same decimal places as specified values.

Summary Table: Key Tests & Limits

Notes:

• Refer IS 2556 Part 1 for general test methods.
• Ensure glaze, thickness, and dimensional tolerances conform to Part 1.
• Sampling and marking as per IS 9140 and IS 2556 Part 1.

flowchart TD
    A[Wash Basin] --> B[Load Bearing Test]
    A --> C[Water Flow Test]
    A --> D[Overflow Test]
    B --> E{Pass/Fail}
    C --> E
    D --> E
    E --> F[Compliance]

This concise overview aids in ensuring wash basins meet IS 2556 (Part 4) performance standards.

Sampling Process, Inspection and Lot Inspection as per IS 2556 Part 4

• Reference Standard:
  The detailed method of sampling, process inspection, and lot inspection for vitreous sanitary appliances including wash basins is specified in IS 9140:1985 (Method of sampling of vitreous and fire clay sanitary appliances).

• Key Points:

  • Sampling is done by selecting a representative number of units from a production lot.
  • Inspection involves checking for compliance with specified dimensions, glaze quality, and structural integrity.
  • Lot acceptance is based on the number of defective items found in the sample, following acceptance criteria in IS 9140.

• Specifications:

  • Sampling size and acceptance criteria depend on lot size and quality level.
  • Inspection covers:
    • Visual defects (cracks, glaze defects)
    • Dimensional tolerances (per IS 2556 Part 1)
    • Functional tests (load bearing, overflow)

• General Inspection Formula:

  Parameter	Criteria/Formula
  Sample size (n)	As per IS 9140 tables based on lot size
  Acceptance number (Ac)	Max allowable defects in sample
  Rejection number (Re)	Minimum defects to reject lot

• Note: For detailed tables and acceptance criteria, refer to IS 9140:1985.

Summary Diagram of Inspection Process

flowchart TD
    A[Start: Lot Production] --> B[Sampling as per IS 9140]
    B --> C[Visual & Dimensional Inspection]
    C --> D{Defects ≤ Ac?}
    D -- Yes --> E[Accept Lot]
    D -- No --> F[Reject Lot or Re-inspect]

In brief: IS 2556 Part 4 defers sampling and inspection procedures to IS 9140, which provides the detailed methodology, sample sizes, and acceptance criteria for vitreous sanitary ware including wash basins.

IS 2556 Part 4 - Marking and Certification Key Points

Marking Requirements (Clause 9.1)

Wash basins must be clearly and indelibly marked with:

• Manufacturer's name or trademark
• Batch/lot number or date of manufacture

BIS Certification Marking (Clause 9.2)

• Wash basins may bear the BIS Standard Mark.
• Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Manufacturers must obtain a license from BIS to use the Standard Mark.
• The Standard Mark ensures compliance with quality and standardization norms.

Additional Notes

• BIS holds copyright on its publications; reproduction requires prior written permission.
• For licensing details, contact the Bureau of Indian Standards regional offices.

Summary Table: Marking & Certification

flowchart TD
    A[Wash Basin] --> B[Marking]
    B --> B1[Manufacturer Name/Trademark]
    B --> B2[Batch/Lot Number or Date]
    A --> C[BIS Standard Mark]
    C --> D[License from BIS]
    D --> E[BIS Act 1986 Compliance]

For detailed licensing, contact BIS at Manak Bhavan or regional offices listed in the standard.