Vitreous Sanitary Appliances (Vitreous China) - - Part 2: Specific Requirements of Washdown Water Closets

IS 2556 (Part 2): 2004 — Scope & Key Specifications

This part specifies functional and connecting dimensions for vitreous china water closets with various trap patterns, ensuring interchangeability and performance.

1. Scope Highlights:

• Applies to vitreous china water closets with P-trap, S-trap, horizontal P-trap, and concealed S-trap.
• Specifies dimensions for seat, outlet, inlet, water seal, and flushing connections.
• Tests (Clause 8.6) require connection to flushing cisterns conforming to IS 774 or IS 7231.
• Flushing pipe diameter: 40 mm normal.
• Cistern height above WC: max 300 mm.

2. Key Functional Dimensions (Table 1, mm):

3. Key Connecting Dimensions (Table 2, mm):

IS 2556 Part 2 - References & Key Specifications

Referenced Standards (per Table 2):

Important Notes:

• Dimension Correction:
  Replace D2 with D2/2 in Table 2, SI No. (vi).
• Radius of Free Space:
  Measure radius from the outlet center; minimum distance = 40 mm from outlet end.
• Rounding Off:
  Follow IS 2:1960 for rounding test results, retaining the same significant figures as specified.

Summary:

• Use latest editions of referenced IS codes for compliance.
• Dimension corrections ensure accurate fitting and testing of sanitary appliances.
• Rounding rules maintain consistency in reporting test results.

flowchart LR
    A[IS 2556 Part 2] --> B[References to IS 774, 2556(Part1), 7231, 9140]
    B --> C[Dimension Corrections: D2 → D2/2]
    B --> D[Radius of free space ≥ 40 mm from outlet]
    B --> E[Rounding off as per IS 2:1960]

This ensures conformity with sanitary appliance standards and testing accuracy.

IS 2556 Part 2 – General Requirements (Clause 3)

• Scope: General requirements for vitreous sanitary appliances refer to IS 2556 Part 1 (1994) for:

  • Terminology
  • Materials
  • Manufacture
  • Glazing
  • Defects
  • Minimum thickness
  • Tolerances
  • Performance
  • Test methods

• Key Reference Standards:

• Rounding off: Follow IS 2:1960 for rounding numerical results, retaining significant figures equal to those in the specified values.

Summary Diagram:

graph TD
A[General Requirements] --> B[Terminology & Materials]
A --> C[Manufacture & Glazing]
A --> D[Defects & Thickness]
A --> E[Tolerances & Performance]
A --> F[Test Methods]
A --> G[Refer IS 2556 Part 1]

For detailed formulas and tables, refer to IS 2556 Part 1 as Part 2 defers to it for specifics.

IS 2556 Part 2: Patterns of Water Closets — Key Specifications

1. Patterns of Water Closets (Clause 4.1)

• Pattern 1: Pedestal WC with independent cistern (Fig. 1)
• Pattern 2: (Not explicitly detailed but similar to Pattern 1)
• Pattern 3: Pedestal WC with independent cistern and horizontal outlet (Fig. 2)
• Pattern 4: Pedestal WC with independent cistern and concealed S-trap (Fig. 3)

2. Functional Dimensions (Table 1, Clause 5)

3. Connecting Dimensions (Table 2, Clause 5)

IS 2556 (Part 2): Functional & Connecting Dimensions Summary

1. Functional Dimensions (Table 1, Clause 5)

All dimensions in mm for Patterns 1 to 4 (see respective figures):

2. Connecting Dimensions (Table 2, Clause 5)

All dimensions in mm for Patterns 1 to 4:

IS 2556 Part 2: Construction & Design Requirements Summary

1. General Requirements

• Conform to IS 2556 Part 1 for terminology, materials, manufacture, glazing, defects, minimum thickness, tolerances, performance, and test methods.

2. Functional Dimensions (Table 1, Clause 5) [All in mm]

Note: For center vent in S trap, overall length = S + 75 mm.

3. Connecting Dimensions (Table 2, Clause 5) [All in mm]

IS 2556 (Part 2): Anti-Siphonage Vent and Connectors Key Points

1. Anti-Siphonage Vent (Clause 6.3 & 6.4.1)

• Location: On outlet side of trap (water closet), at 45° angle (Fig. 4).
• Dimension: Vent hole invert not below outlet centerline.
• Pattern 3 (horizontal outlet): Vent provided in special connector.

2. Functional Dimensions (Table 1, Clause 5)

3. Connecting Dimensions (Table 2, Clause 5)

4. Testing (Clause 8.6)

• Connect water closet to low-level cistern (IS 774 or IS 7231).
• Height between closet top and cistern bottom ≤ 300 mm.
• Use 40 mm diameter flushing pipe.
• Test with cistern capacity as per appliance design.

Summary Diagram of Anti-Siphonage Vent Location

flowchart LR
    WC[Water Closet Trap Outlet]
    Vent[Anti-Siphonage Vent Hole]
    WC -->|45° angle| Vent
    Vent -->|Invert not below outlet centerline| WC

Note: Always refer

IS 2556 Part 2: Performance & Testing Procedures Summary

Testing Procedure (Clause 8.6)

• Connect water closet (WC) to a low-level cistern conforming to IS 774 or IS 7231.
• Height between top of WC and bottom of cistern ≤ 300 mm.
• Use a 40 mm diameter flushing pipe.
• Use cistern capacity as per appliance design.
• Tests per Clauses 8.1 to 8.7.

Key Functional Dimensions (Table 1, Clause 5) [mm]

Connecting Dimensions (Table 2, Clause 5) [mm]

Notes:

• Ovality tolerances apply to inlet/outlet diameters.
• Overall length for center vent in S-trap = S + 75 mm.
• Rounding off results per IS 2:1960.

Diagram Concept (Simplified Flushing Setup)

flowchart TD
    Cistern[Low-level Cistern (IS 774 / IS 7231

IS 2556 Part 2: Sampling, Inspection, and Lot Inspection

Key Points:

• Sampling & Inspection:
  The standard refers to IS 9140 for detailed procedures on sampling, process inspection, and lot inspection of vitreous china sanitary appliances.

• Flush Test Procedure (Clause 8.7.1):

  • Set up WC or cistern as per manufacturer instructions.
  • Fill with coloured water to design water seal level.
  • Clean and dry floor area for splash test.
  • Activate flush valve/cistern and observe splash over rim onto floor.
  • Repeat 5 times; isolated droplets ≤10 are acceptable and not grounds for rejection.

• Rounding Off (IS 2:1960):
  Final test values must be rounded off as per IS 2 rules, matching the significant digits of the specified values.

Summary Table: Flush Splash Acceptance Criteria

Reference for Sampling & Inspection:

flowchart TD
    A[Start: Sample Selection] --> B[Process Inspection per IS 9140]
    B --> C{Flush Test (5 times)}
    C -->|Splash ≤10 droplets| D[Accept Sample]
    C -->|Splash >10 droplets| E[Reject Sample]
    D --> F[Lot Acceptance]
    E --> G[Lot Rejection]

Use IS 9140 for detailed sampling tables and acceptance criteria beyond flush testing.

IS 2556 Part 2: Marking and Certification Key Points

• BIS Certification Marking (Clause 10.2):
  Products may carry the BIS Standard Mark, indicating compliance with Indian Standards.

• Use of Standard Mark (Clause 10.2.1):
  Governed by the Bureau of Indian Standards Act, 1986.

  • Licence for use granted by BIS under specific conditions.
  • Details available from BIS regional offices or official website.

• BIS Contact and Regional Offices:
  Useful for certification queries and licensing:

  • Central (New Delhi), Eastern (Kolkata), Northern (Chandigarh), Southern (Chennai), Western (Mumbai)
  • Multiple branch offices across India.

• Important Notes:

  • BIS owns copyright of publications; reproduction requires permission.
  • Free use allowed for implementation (symbols, sizes, type/grade designations).

Summary Table: BIS Certification Marking

BIS Regional Offices (Sample)

For detailed licensing terms and marking specifications, contact BIS directly or visit www.bis.gov.in.