Automatic Flushing Cisterns for Urinals (Other than Plastic Cisterns)

IS 2326: Scope - Key Specifications & Units

Scope Overview:

• Applies to flushing cisterns with requirements on materials, construction, operation, and testing.
• Includes marking with the BIS Standard Mark on the cistern body.
• Requires agreement between purchaser and supplier on specific requirements (Clause 2.1).

Important Specifications:

• Marking (Clause 8.1.1):
  Each cistern must bear the BIS Standard Mark ensuring compliance and quality control.

• Feeding Device Location (Clause 4.6):
  Outlet must be ≥ 3 mm above the highest water level before siphonage starts.

• Endurance Test (Clause 7.1):
  Cisterns must operate 3000 times without damage or defects; tested after verifying materials, construction, and operation.

Units (SI System) Used in IS 2326:

Summary Diagram of Key Clause Relations:

graph TD
  A[Scope: IS 2326] --> B[Marking - BIS Standard Mark]
  A --> C[Feeding Device - Outlet ≥ 3 mm above water level]
  A --> D[Endurance Test - 3000 operations]
  D --> E[Material, Construction & Operation Checks]

This concise summary helps ensure compliance with IS 2326 scope and key requirements.

IS 2326: Key Material Specifications & Units

1. Materials for Cisterns:

• Pressed Steel: Must conform to IS 513:1973.
• Vitreous Enamelling: Must conform to IS 3972:1968 (Methods of test for vitreous enamelware).

2. Units and Symbols (SI Units) for Structural Calculations:

3. Rounding Off Values:

• Follow IS 2:1960 for rounding off numerical test results, maintaining the same significant figures as specified.

Summary:

• Use IS 513 steel and IS 3972 enamelling for cistern materials.
• Adhere to SI units for all calculations.
• Round off results per IS 2:1960.

flowchart TD
    A[Material Selection] --> B[Pressed Steel (IS 513)]
    A --> C[Vitreous Enamel (IS 3972)]
    D[Testing] --> E[Rounding off (IS 2)]
    F[Calculations] --> G[Use SI Units]

This ensures compliance with IS 2326 material and testing standards.

IS 2326 Key Specifications: Nominal Sizes & Discharge Capacity

• Nominal Sizes (Clause 3.1):

  • Cistern capacities: 5 litres and 10 litres
  • Discharge capacity tolerance: ±0.5 litres (i.e., actual discharge = nominal ±0.5 L)

• Feeding Device (Clause 4.6):

  • Outlet must be at least 3 mm above the highest water level before siphonage starts.

• Outlet Connection (Clause 4.4.2):

  • Minimum nominal diameter of siphon outlet: 25 mm
  • External threading per IS 2643 (Parts 1-3) - 1975

Summary Table: Nominal Size vs Discharge Capacity

Important Notes:

• Marking of cisterns with Standard Mark per Clause 8.1.1 ensures compliance and quality control.
• Dimensions and threads for fastening follow IS 2643 standards.

flowchart LR
    A[Cistern Nominal Size] --> B[Discharge Capacity ±0.5 L]
    B --> C{Feeding Device Outlet}
    C -->|Height ≥ 3 mm above max water level| D[Prevents Siphonage]
    B --> E[Outlet Diameter ≥ 25 mm]
    E --> F[Threading per IS 2643]

This ensures reliable flushing performance and standardization as per IS 2326.

IS 2326: Construction and Dimensions Key Points

1. Construction Materials

• Pressed Steel: Must conform to IS 513:1973.
• Vitreous Enamelling: Must comply with IS 3972:1968.
• Enamelling ensures durability and corrosion resistance.

2. Dimensions

• Nominal Size for Urinal Cistern: Minimum capacity of 2.5 litres per urinal (Clause 2.5).
• Feeding Device Outlet: Located at least 3 mm above the highest water level before siphonage (Clause 4.6).

3. Units and Quantities (SI Units)

4. Marking

• Cisterns must be marked with the Standard Mark on the body (Clause 8.1.1), ensuring compliance with BIS quality control.

Summary Table: Key Dimensions

flowchart TD
    A[Construction] --> B[Pressed Steel (IS 513)]
    A --> C[Vitreous Enamel (IS 3972)]
    D[Dimensions] --> E[Urinal Cistern ≥ 2.5 L]
    D --> F[Feeding Outlet ≥ 3 mm above water level]
    G[Marking] --> H[Standard Mark on cistern body]

This ensures durability, proper functioning, and regulatory compliance.

IS 2326: Performance Requirements - Key Points

1. Endurance Test (Clause 7.1)

• Sample cisterns must comply with materials, construction, and operation requirements.
• Operated 3,000 times without damage or defects.
• Ensures durability after design or manufacturing changes.

2. Siphon Performance (Clause 6.1)

• Flow rate: Minimum 2.5 litres per urinal every 10-20 minutes.
• Flush force: No decrease during discharge.
• Flush volume: At least 5 litres in 7 seconds through a 20 mm bore, 900 mm length flush pipe.
• Flush pipe must be smooth, made of copper, plastic, or suitable material.

3. Marking (Clause 8.1.1)

• Cisterns must bear the Standard Mark on the body, indicating compliance and quality control under BIS supervision.

Relevant Units & Definitions (SI Units)

Summary Diagram: Flushing Siphon Performance

flowchart LR
    A[Water Supply] --> B[Siphon]
    B --> C[Flush Pipe (20 mm, 900 mm)]
    C --> D[Urinal]
    B -- Flow Rate --> E[≥ 2.5 L every 10-20 min]
    C -- Discharge Volume --> F[≥ 5 L in 7 sec]

For detailed testing procedures, refer to clauses 6.1 and 7.1 of IS 2326.

IS 2326: Siphonic Apparatus Key Specifications

1. Performance Requirements (Clause 6.1)

• Flush volume: 2 to 5 litres per urinal.
• Flush interval: Every 10 to 20 minutes.
• Flush pipe: 20 mm bore, 900 mm length, smooth inside surface (copper/plastic).
• Discharge rate: Minimum 5 litres in 7 seconds through the flush pipe.
• Flush flow: No flow outside flush duration; consistent force during discharge.

2. Material Specifications (Clause 4.4.1)

• Materials: Vitreous china, HDPE, LDPE, polypropylene, cast iron (corrosion protected).
• Must be impervious, corrosion-resistant, smooth finished, and rigid.

3. Typical Test Setup (Clause 6.1c)

• Flush pipe length measured from siphon outlet.
• Ensures proper flow and discharge rate.

Summary Table: Siphonic Apparatus Flush Requirements

flowchart LR
    A[Water Storage Cistern] --> B[Siphonic Apparatus]
    B --> C[Flush Pipe (20mm, 900mm)]
    C --> D[Urinal]
    style B fill:#f9f,stroke:#333,stroke-width:2px
    style C fill:#bbf,stroke:#333,stroke-width:2px

Note: Ensure siphon design prevents backflow and maintains flush force throughout discharge.

IS 2326: Endurance Test for Flushing Cisterns

Key Specification (Clause 7.1)

• Sample Selection: Randomly picked from production.
• Preliminary Checks: Confirm conformity to:
  • Materials (Clause 2)
  • Construction (Clause 4)
  • Operation (Clause 6)
• Test Procedure: Operate the cistern 3,000 times continuously.
• Acceptance Criteria: Post-test, no damage or defects; all parts must be satisfactory.

Purpose

• To verify durability under repeated operation.
• Conducted by recognized testing labs.
• Required after any design, material, or manufacturing change.

Summary Table: Endurance Test Parameters

Additional Notes

• The test ensures long-term reliability.
• Related standards for coatings and enamelware are referenced for material durability.
• Marking (Clause 8.1.1) ensures traceability and compliance.

flowchart TD
    A[Sample Selection] --> B[Material Check]
    B --> C[Construction Check]
    C --> D[Operation Check]
    D --> E[Endurance Test: 3000 Cycles]
    E --> F{Damage or Defects?}
    F -- No --> G[Pass Test]
    F -- Yes --> H[Fail Test]

This test is critical for quality assurance of flushing cisterns as per IS 2326.

IS 2326 - Marking of Cisterns (Clause 8.1 & 8.1.1)

• Marking Location: On the body of the cistern (inside or outside as convenient).
• Mandatory Marking: Manufacturer's name or trademark.
• Optional Marking: Nominal size of the cistern.
• Standard Mark: May be applied as per BIS regulations, ensuring compliance with quality and inspection norms.

Key Points on Standard Mark:

• Governed by Bureau of Indian Standards Act, 1986.
• Indicates conformity to IS 2326 under BIS supervised quality control.
• Licence for use of Standard Mark is subject to BIS approval.

Rounding Off (Clause 0.5):

• Final test/analysis values shall be rounded as per IS 2:1960.
• Maintain the same number of significant digits as specified values.

Summary Table for Marking:

Units Reference (SI Units from IS 2326):

flowchart LR
    A[Cistern Body] --> B{Marking}
    B --> C[Manufacturer Name - Mandatory]
    B --> D[Nominal Size - Optional]
    B --> E[Standard Mark - Optional (BIS)]

This ensures traceability and quality assurance as per IS 2326.