Vitreous Sanitary Appliances (Vitreous China) -, Part 8: Specific Requirements of Pedestal Close Coupled Washdown and Symphonic Water Closets

Scope & Key Specifications from IS 2556 Part 8 (Clause 6.1 & Table 2):

This part covers functional and connecting dimensions of WC pans and outlets critical for plumbing compatibility.

Connecting Dimensions (All in mm)

Notes:

• Ovality is permissible within internal/external diameter limits.
• Dimensions ensure compatibility with plumbing fixtures and traps.
• Rounding of test values must follow IS 2:1960 rules.

Summary:

• Internal outlet diameter: ≥ 80 mm
• Outlet angle: Typically 104° or

IS 2556 Part 8: Key References, Tables & Specifications

1. References (Table 2)

• IS 774:1984 — Flushing cisterns (non-plastic)
• IS 2556 (Parts 1 & 7) — Vitreous sanitary appliances specifications
• IS 7231:1994 — Plastic flushing cisterns
• IS 9140:1996 — Sampling methods for vitreous/fire clay appliances

2. Connecting Dimensions (Clause 6.1, Table 2)

All dimensions in mm

IS 2556 Part 8: General Requirements Summary

• Functional and Connecting Dimensions:

  • Functional dimensions (non-connecting) and connecting dimensions (critical for plumbing) are specified in Table 1 and Table 2 respectively.
  • These dimensions ensure compatibility and proper installation.

• Compliance with IS 2556 Part 1:

  • Terminology, materials, manufacturing, glazing, defects, minimum thickness, performance, and testing methods must comply with IS 2556 Part 1.
  • This ensures uniform quality and performance standards.

Key Points:

Note:

• Always refer to IS 2556 Part 1 for detailed specifications on materials and testing.
• Tables 1 & 2 provide critical dimensional data for design and installation.

flowchart LR
    A[General Requirements] --> B[Functional Dimensions (Table 1)]
    A --> C[Connecting Dimensions (Table 2)]
    A --> D[Materials & Manufacturing (IS 2556 Part 1)]
    A --> E[Performance & Testing (IS 2556 Part 1)]

This ensures all components meet plumbing and structural compatibility per IS standards.

IS 2556 Part 8: Patterns and Construction of Pedestal Closets

Patterns (Clause 4.1)

Pedestal closets with close-coupled cisterns shall be one of these patterns:

Key Specifications

• Functional and connecting dimensions must comply with Table 1 and Table 2 (Clause 6.1).
• Pattern 4 requires special connectors for horizontal outlet; outlet must be grooveless on the straight part (Clause 5.4).
• Other patterns must follow standard trap configurations and dimensions.

Typical Dimension Tables (Summary)

Notes:

• Alternative patterns allowed only if manufacturer and purchaser agree.
• All other IS code requirements apply strictly except functional dimensions for custom patterns.

flowchart TD
    A[Pedestal Closets] --> B[Pattern 1: Double Trap Syphonic]
    A --> C[Pattern 2: Single Trap Syphonic]
    A --> D[Pattern 3: Washdown (P or S trap)]
    A --> E[Pattern 4: Washdown with Horizontal Outlet]
    E --> F[Special Connector Required]

For exact dimensions, refer to IS 2556 Part 8 Tables 1 & 2.

IS 2556 Part 8: Design and Fixing Requirements

Key Specifications from Clause 6.1 & Table 2 (Connecting Dimensions)

• Ovality is permissible within internal and external diameter limits.
• Dimensions are critical for plumbing fit and functional performance.

Additional Notes

• Clause 9.4.2 specifies a Fifty Ball Test for durability (details not fully provided here).
• Refer to IS

IS 2556 Part 8: Dimensions and Tolerances Summary

1. Functional Dimensions (Table 1, Clause 6.1)

2. Connecting Dimensions (Table 2, Clause 6.1)

IS 2556 Part 8: Materials and Surface Finish – Key Specifications

1. Materials

• Vitreous china is the standard material for sanitary appliances.
• Refer IS 2556 (Part 1 & 7) for general and detailed material specifications.
• Materials must comply with durability, non-absorbency, and chemical resistance criteria.

2. Surface Finish

• The surface must be smooth, glossy, and free from defects such as cracks or blisters.
• Surface finish is verified by the Fifty Ball Test (Clause 9.4.2):
  • Fifty non-absorbent balls of specified mass are used to check surface durability.

3. Connecting Dimensions (Clause 6.1, Table 2)

Ovality tolerance applies to internal and external diameters.

Summary Diagram of Outlet Dimensions

flowchart LR
    A[Outlet] -->|Internal Diameter d₁| B((80 mm Min))
    A -->|External Diameter d₂| C((102 ± 5 mm))
   

IS 2556 Part 8: Flushing Cistern Requirements Summary

1. General Requirements

• Flushing cisterns shall be low-level coupled type.
• Must conform to IS 774 or IS 7231 (except inlet & overflow may be from bottom).
• No separate flush pipe needed if inlet & overflow are bottom-mounted.
• Discharge rate test is not applicable for all patterns.

2. Functional Dimensions (Table 1, Clause 6.1)

3. Connecting Dimensions (Table 2, Clause 6.1)

IS 2556 Part 8: Performance Tests Key Points

1. Single Ball Test (Clause 9.4.1)

• Used to check water seal integrity.
• Procedure: Charge WC with colored water to design water seal level.
• Activate flush; observe splashes.
• Up to 10 isolated droplets splashing onto floor allowed without rejection.

2. Fifty Ball Test (Clause 9.4.2)

• Uses 50 balls of non-absorbent material (mass not specified here).
• Tests trap seal performance by counting balls retained.
• Ensures trap does not allow passage of foreign objects.

3. Load Bearing Test (Clause 10)

• WC fixed securely on floor.
• Apply a load of 400 ± 5 kg (or 4 ± 0.5 kN) on a 100 mm × 100 mm wooden beam across the top opening.
• Load held for 1 hour.
• No damage or defects allowed.

4. Connecting Dimensions (Table 2, Clause 6.1)

5. Functional Dimensions (Table 1, Clause 6.1)

• Height (H): 390 ± 10 mm
• Width (W): 360 ± 10 mm
• Depth of water seal (DI):

IS 2556 Part 8: Load Bearing Test & Related Specifications

1. Load Bearing Test (Clause 10)

• Load Applied: 400 ± 5 kg (equivalent to 4 ± 0.05 kN)
• Duration: 1 hour
• Setup: Load applied via a wooden beam (100 mm × 100 mm cross-section) placed across the WC top opening.
• Acceptance: No damage or defect shall occur.

2. Splash Test (Clause 9.6.1 - Procedure)

• WC is charged with coloured water to design water seal level.
• Flush valve/cistern activated.
• Observe water splash on floor; up to 10 isolated droplets allowed without rejection.

3. Connecting Dimensions (Table 2, Clause 6.1)

Summary Diagram: Load Bearing Test Setup

graph TD
    A[Wooden Beam 100x100 mm] -->|Load 400±5 kg| B[WC Top Opening]
    B --> C[WC Fixed on Floor]
    C --> D[No Damage Allowed]

Note: Sampling & inspection follow IS 9140. The test ensures structural integrity and usability of WC under load and operational conditions.

IS 2556 (Part 8): Sampling and Inspection Key Points

1. Rounding Off (IS 2:1960)

• Final test values must be rounded off matching the significant digits of the specified values.
• Ensures consistency in reporting test results.

2. Fifty Ball Test (Clause 9.4.2)

• Uses 50 balls of non-absorbent material (mass not specified here).
• Purpose: To check surface finish or defects.
• Details in Table 9.4.2 (not fully provided).

3. Connecting Dimensions (Clause 6.1, Table 2)

IS 2556 Part 8: Marking and Certification - Key Points

BIS Certification Marking (Clause 12.2)

• Standard Mark Usage: Products may be marked with the BIS Standard Mark as per Clause 12.2.1.
• Regulation: Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986 (Clause 12.2.2).
• Licensing: Manufacturers must obtain a license from BIS to use the Standard Mark.
• Copyright: BIS holds copyright of all publications; reproduction requires prior permission except for necessary implementation details.

Important Contacts for BIS Licensing and Queries

Summary:

• Marking: BIS Standard Mark indicates conformity to IS 2556 Part 8.
• Certification: Must be licensed by BIS.
• Legal Framework: Governed by BIS Act, 1986.
• Contact BIS for licensing and detailed conditions.

flowchart LR
    A[Manufacturer] --> B{Apply for BIS License}
    B -->|Approved| C[Use BIS Standard Mark]
    B -->|Rejected| D[No Marking Allowed]
    C --> E[Product Market]
    D --> E

For detailed licensing conditions, contact the nearest BIS regional office.