Code of practice for sanitary pipe work above ground for buildings

IS 5329: Scope - Key Points & Tables

Scope Summary (Clause 3.1)

• Covers design of soil and waste pipe systems above ground.
• Requires coordination among local authority, owner, architect, and engineer.
• Essential data includes:
  • Number, position, and type of plumbing appliances.
  • Sewer location and size.
  • Local authority requirements.
• For existing systems: condition, tests, ventilation, and connected appliances must be assessed.
• Plumbing contractor needs approved drawings and specifications covering materials, fixing, jointing, and statutory requirements.

Key Table: Minimum Internal Diameters for Waste Appliances (Clause 6.5.4)

Definitions

• Fixture Unit (Clause 2.25): A unit expressing the load effect of plumbing fixtures on the system.

Design Workflow (Simplified)

flowchart TD
    A[Collect Preliminary Data] --> B[Consult Local Authority, Owner, Architect, Engineer]
    B --> C[Determine Appliances & Sewer Info]
    C --> D[Prepare Drawings & Specifications]
    D --> E[Submit for Approval]
    E --> F[Provide Contractor with Approved Docs]

This concise framework ensures compliance with IS 5329 for plumbing system design and installation.

IS 5329 Key Definitions & Specifications

Definitions (Clause 2.0)

• Fixture Unit (Clause 2.25):
  A unit expressing the load effect of various plumbing fixtures on the system, based on an arbitrary scale.

• Diameter (Clause 2.10):
  Nominal diameter of pipes and fittings.

Key Table: Minimum Internal Diameters for Waste Appliances (Clause 6.5.4, Table 1)

Notes:

• These diameters ensure proper flow and trap function.
• Fixture units help in calculating total system load for pipe sizing.

flowchart TD
    A[Fixture Unit] --> B[Load on Plumbing System]
    B --> C[Pipe Diameter Selection]
    C --> D[Trap Selection (Table 1)]
    D --> E[Proper Drainage & Venting]

This summarizes IS 5329 definitions and key sizing for plumbing fixtures.

IS 5329: Preliminary Information and Consultation - Key Points

1. Information Collection (Clause 3.1)

• New Work: Coordination among local authority, owner, architect, and engineer on:
  • Number, position & types of appliances
  • Position & size of sewers, precautions to avoid flooding
  • Local authority requirements
• Existing Work: Include test results, appliance details, pipe condition, and ventilation particulars.
• Local Authority: Notify on appropriate forms with work particulars.
• Plumbing Contractor: Provide approved drawings with annotations and specifications covering:
  • Work description
  • Statutory requirements
  • Materials
  • Fixing & jointing methods
  • Special requirements

2. Fixture Unit (Clause 2.25)

• A unit expressing load effects of various plumbing fixtures on the system.

3. Minimum Internal Diameters for Waste Appliances (Table 1, Clause 6.5.4)

4. Testing Efficiency (Clause 7.3.4)

• Perform each test at least 3 times.
• Maximum seal loss among tests is the significant result.

flowchart TD
    A[Start: New/Existing Work Info] --> B{New Work?}
    B -- Yes --> C[Consult Local Authority, Owner, Architect, Engineer]
    B -- No --> D[Gather Test Results, Appliance & Pipe Condition]
    C --> E[Prepare Drawings & Specs for Contractor]
    D --> E
    E --> F[Notify Local Authority & Obtain Approval]
    F --> G[Provide Contractor Approved Drawings & Specs]
    G --> H[Design & Installation]

This ensures compliance and smooth coordination for soil and waste pipe systems design per IS 532

IS 5329: Time Schedule Key Points & Specifications

Clause 4.1: Time Schedule Preparation

• Prepare a time schedule aligned with main building work, especially underground drainage.
• Schedule must be flexible to adjust with project progress.
• Consider:
  • Dates for drawings submission
  • Material supply and delivery dates
  • Start and completion dates for each work section

Important Notes:

• Work must be done by a licensed plumber (Clause 3.2).
• Coordination with other trades is essential for smooth progress.

Additional Relevant Data (for Plumbing Design):

Summary Diagram of Time Schedule Coordination:

gantt
    title Plumbing Installation Time Schedule
    dateFormat  YYYY-MM-DD
    section Drawings
    Drawings Submission       :done, 2024-05-01, 2024-05-10
    section Material Supply
    Material Ordering         :active, 2024-05-05, 10d
    Material Delivery         : 2024-05-15, 5d
    section Installation
    Underground Drainage Work : 2024-05-20, 15d
    Soil & Waste Pipework     : 2024-06-05, 20d
    Final Inspection          : 2024-06-25, 5d

Use this schedule as a baseline and adjust as per actual site conditions.

IS 5329: Materials and Components - Key Points

1. Material Specifications (Clause 5.1)

• Materials must conform to relevant Indian Standards (IS).
• If no IS exists, materials must be of satisfactory quality and workmanship acceptable to the owner.

2. Corrosion Resistance (Clause 5.2.1)

• Select materials resistant to:
  • Corrosion from the liquid carried.
  • Atmospheric conditions.
  • Electrolysis effects.

3. Testing Efficiency (Clause 7.3.4)

• Each test repeated at least 3 times.
• Maximum loss of seal in any test is the significant result.

4. Fixture Unit (Clause 2.25)

• Fixture Unit quantifies load effects on plumbing systems.
• Used for designing plumbing loads.

Practical Notes:

Summary Diagram

flowchart TD
    A[Material Selection] --> B{Indian Standard Exists?}
    B -- Yes --> C[Use IS Compliant Material]
    B -- No --> D[Use Owner-Approved Quality]
    C --> E[Check Corrosion Resistance]
    D --> E
    E --> F[Testing - 3 Times Minimum]
    F --> G[Max Loss of Seal Recorded]

Ensure:

• Material quality per IS
• Corrosion resistance for durability
• Testing for design validation

For detailed IS codes, refer to the relevant IS documents listed above.

IS 5329: Design Considerations - Key Points

1. Material Selection (Clause 5.2.1)

   • Use corrosion-resistant materials against:
     • Liquid carried
     • Atmospheric conditions
     • Electrolysis effects

2. Fixture Unit (Clause 2.25)

   • Represents load impact of plumbing fixtures on the system.
   • Used to calculate total load for sizing pipes and stacks.

3. Design Data for Single Stack Plumbing (Clause 6.9)

   • Use fixture units to estimate total load.
   • Determine pipe diameters based on flow rates and fixture units.
   • Ensure venting and drainage meet flow velocity and slope requirements.

4. Testing Efficiency (Clause 7.3)

   • Conduct tests for water-tightness and venting efficiency.
   • Verify flow and drainage performance under design loads.

Typical Formula for Flow Rate (Q) from Fixture Units (FU):

[ Q = K \times \sqrt{FU} ]

• Q = Flow rate (liters per second)
• FU = Total fixture units
• K = Constant depending on system type (refer IS 5329 table)

Example Table Extract (Fixture Units vs Pipe Diameter):

flowchart LR
    Fixtures -->|Fixture Units| Load Calculation
    Load Calculation -->|Flow Rate Q| Pipe Sizing
    Pipe Sizing --> Design Efficiency Testing
    Design Efficiency Testing --> Final Approval

Summary: Select corrosion-resistant materials, calculate loads using fixture units, size pipes accordingly, and test system efficiency per IS 5329 guidelines.

IS 5329: Inspection and Testing Key Points

Inspection (Clause 7.1 & 7.1.1)

• Inspect during installation; test before concealment.
• Confirm compliance with drawings/specifications.
• Check secure fixing of brackets, clips; correct spacing.
• Ensure thermal insulation & protection of embedded pipes.
• Access covers/plugs must:
  • Be accessible.
  • Match internal bore shape.
  • Not obstruct flow.
  • Be well jointed.

Testing (Clause 7.1.1 & 7.3.4)

• Pipe systems tested for:
  • Gas-tightness
  • Hydraulic performance
• Each test repeated at least 3 times.
• Maximum seal loss in tests is the significant result.
• Defects must be repaired and tests repeated until satisfactory (Clause 7.2.4.1).

Table 3 (Single Stack System Design Recommendations)

• Refer IS 5329 Table 3 for stack design parameters (not fully reproduced here).

Summary Table for Testing

flowchart TD
    A[Installation] --> B[Inspection]
    B --> C{Work Concealed?}
    C -- No --> D[Complete Testing]
    C -- Yes --> E[Test Before Concealment]
    D --> F[Gas-tightness Test]
    D --> G[Hydraulic Performance Test]
    E --> F
    E --> G
    F & G --> H{Defects Found?}
    H -- Yes --> I[Repair Defects]
    I --> D
    H -- No --> J[Accept Work]

Note: Always follow IS 5329 Clause 7 for detailed inspection and testing procedures.

IS 5329 - Layout of Pipes: Key Points & Formulas

1. Pipe Diameter Calculation

• Refer IS 1742:1983 (Clause 4.5.1) for pipe diameter based on flow capacity.
• Diameter depends on fixture units and discharge rates.

2. Pipe Layout (Clause 6.3 & 6.9.2.1)

• Pipes to be laid in straight lines vertically and horizontally.
• Avoid abrupt bends/junctions except at manholes/inspection chambers.
• Group appliances closely; e.g., water closets near main soil pipe.
• Level of trap outlet must relate properly to floor and branch pipe levels.

3. Connection Guidelines

• BYP (Branch Vent Pipe) and BVP (Branch Waste Pipe) need not connect to highest branch if length is short.
• MVP (Main Vent Pipe) can connect above highest fitting or to main soil/waste pipe.
• Access points depend on design details.

4. System Types & Max Lengths

• Two-pipe system and One-pipe system diagrams (Fig. 2 & 3) illustrate connections.
• Max branch length ~ 1-7 m (depending on system).

5. Mermaid Diagram: Basic Pipe Layout Concept

flowchart TD
  A[Fixture] -->|Trap Outlet| B[Branch Pipe]
  B --> C[Main Soil Pipe]
  C --> D[Building Drain]
  B --> E[Vent Pipe]
  E --> F[Main Vent Pipe]
  F --> G[Open Air]

Summary:

• Straight, smooth pipe runs.
• Proper trap and branch levels.
• Venting and access per design.
• Follow IS 1742 for sizing.

For detailed tables and sizing, refer IS 1742:1983 Clause 4.5.1.

IS 5329: Ventilation of Pipe Systems – Key Specifications

• Main Ventilating Pipe Diameter (Clause 6.8.6.2):
  Minimum 50 mm diameter.

• Branch Ventilating Pipe Diameter (Clause 6.8.6.4):
  Minimum 32 mm diameter on soil pipes (both 1- and 2-pipe systems).

• Pipe Capacity Calculation (Clause 6.2):
  Refer to Clause 4.5.1 of IS 1742:1983 for sizing based on flow and pressure requirements.

Ventilation Pipe Diameter Summary

Additional Notes:

• Vent pipes prevent siphoning of traps and allow free flow of air.
• Ensure vent pipes extend above roof level to prevent ingress of sewer gases.
• Use IS 1742:1983 for detailed hydraulic capacity calculations.

flowchart TD
    SoilPipe --> BranchVentPipe[Branch Vent Pipe ≥ 32mm]
    BranchVentPipe --> MainVentPipe[Main Vent Pipe ≥ 50mm]
    MainVentPipe --> Roof[Extends above Roof]

This ensures proper ventilation and trap protection as per IS 5329.

IS 5329: Traps and Water Seals Key Specifications

1. Definitions:

• Trap (Clause 2.23): Device providing a liquid seal to prevent air backflow without hindering sewage flow.
• Water Seal (Clause 2.24): Water in a trap acting as an air barrier.

2. Minimum Internal Diameters for Waste Appliances (Table 1):

3. Depth of Water Seals for Different Plumbing Systems (Table 2):

Note: No separate seals needed if connected via floor trap.

4. Important Considerations:

• Water seal depth ensures effective air barrier.
• Selection depends on pipe system type (two-pipe, one-pipe, single stack).
• Proper venting is essential for trap function.

flowchart TD
    A[Fixture] --> B[Trap]
    B --> C[Water Seal (Depth as per Table 2)]
    C --> D[Waste Pipe (Diameter as per Table 1)]
    B -.-> E[Prevents air backflow]

This concise guide aids in selecting traps and water seal depths per IS 5329 for

IS 5329: Fixing and Support of Pipes – Key Points

1. Pipe Fixing & Support Requirements (Clause 7.1.1)

• Fixings must be securely fixed and correctly spaced.
• Pipes should be protected by thermal insulation where necessary.
• Embedded pipes must be protected before sealing-in.
• Access covers/plugs must:
  • Be accessible
  • Complete the internal bore without obstruction
  • Be well jointed

2. Soil Pipe Support (Clause 6.6.5)

• Provide a heel rest bend resting on a sound footing.
• Fix pipe at least 50 mm clear from finished wall surface using approved clamps.

3. Pipe Material Selection (Clause 5.2)

• Common materials:
  • Asbestos cement (IS:1626 Part 1)
  • Cast iron (IS:1536, 1537, 1538, 1729, 3989)
  • Salt glazed stoneware (IS:651)
  • Galvanized steel & wrought iron (IS:1239 Part 1)
  • Other approved materials

4. Pipe Diameter Calculation

• Refer IS 1742-1983 Clause 4.5.1 for pipe capacity and diameter design.

Typical Fixing Spacing (General Practice)

flowchart LR
    A[Pipe] --> B[Fixing Clamp]
    B --> C[Wall or Support Structure]
    A --> D[Heel Rest Bend]
    D --> E[Sound Footing]
    A --> F[Thermal Insulation (if required)]

Summary: Use approved clamps spaced per pipe size, ensure heel rest bends on footing, protect pipes thermally, and select materials per IS 5329 Clause 5.2.

Noise Insulation Key Points from IS 5329

• Clause 6.3.5:
  All pipework adjacent to living/sleeping areas must be sound insulated to prevent noise transmission between apartments. Refer to IS 1950-1962 for detailed sound insulation practices.

• Sound Insulation Measures:

  • Use acoustic lagging or insulation wraps around pipes.
  • Avoid direct pipe contact with walls/floors to reduce vibration transmission (use rubber mounts or isolation clips).
  • Design pipe routes to minimize noise paths between units.

• Testing (Clause 7.3.4):

  • Conduct at least 3 tests for seal efficiency; take the maximum loss as the design value.

Additional Recommendations (Based on Engineering Practice)

Summary Diagram: Noise Transmission Path in Pipework

flowchart LR
    A[Water Flow in Pipe] --> B[Pipe Vibrations]
    B --> C[Pipe Wall]
    C --> D[Building Structure]
    D --> E[Living/Sleeping Quarters]
    style B fill:#f9f,stroke:#333,stroke-width:2px
    style D fill:#bbf,stroke:#333,stroke-width:2px

For detailed sound insulation design, consult IS 1950-1962 and ensure pipework is acoustically isolated near sensitive areas.

Access for Cleaning - IS 5329 Key Points

1. Cleaning Eye (Clause 2.8):

   • An access opening in pipes/fittings for clearing obstructions.
   • Must have a removable cover for easy maintenance.

2. Trap Access (Clause 6.5.3):

   • All traps, especially domestic waste traps, should be conveniently accessible.
   • Provide cleaning eyes or equivalent cleaning access.

3. Trap Sizes & Waste Appliances (Table 1, Clause 6.5.4):

4. Design Recommendations (Clause 6.9.4):
   • Use 75 mm seal P-traps for wash basin wastes to prevent self-siphonage.
   • Waste pipes longer than 165 cm should be vented or upsized.
   • Long waste pipes require cleaning access to prevent sedimentation.
   • Bends should have a minimum radius of 75 mm to centerline.
   • Floor traps require 50 mm seal traps; branch pipe slope can vary 1:50 to 1:10.

Summary Diagram of Cleaning Access Concept

flowchart LR
    A[Pipe/Fitting] --> B[Cleaning Eye]
    B --> C[Removable Cover]
    C --> D[Access for Clearing Obstruction]
    A --> E[Trap]
    E --> F[Cleaning Eye or Equivalent Access]

In brief: Provide cleaning eyes on traps and long waste pipes; use minimum diameters as per Table 1; ensure proper trap seals and venting to avoid siphonage and back pressure; maintain accessible cleaning points for maintenance.

Key Specifications & Design Recommendations for Single Stack System (IS 5329: Clause 6.9)

1. Trap Seal Depths (Clause 6.9.2c)

• Water closets: 50 mm
• Floor traps: 50 mm
• Other fixtures:
  • On 40 mm waste pipe: 75 mm or more
  • On ≤75 mm waste pipe: less than 75 mm seal allowed
• No separate seals needed if connected through floor trap.

2. Pipe Diameters (Clause 6.9.2d)

• WC discharge branches & stacks: ≥ 100 mm (80 mm allowed for siphonic WC outlet)
• Floor trap outlets: 75 mm

3. Slope & Length of Waste Pipes (Table 3, Clause 6.9.4)

• Wash basin waste: 40 mm pipe, max length 165 cm; slope per Fig. 7; bends radius ≥ 75 mm
• Longer pipes require venting or larger diameter/resilient traps.
• Bath/sink wastes: 38 mm pipe & trap; length and slope less critical.

4. Branch & Stack Connections

• WC branches: swept fittings, min 5 cm radius to avoid induced siphonage.
• Bend at foot of stack: large radius or two 135° bends; vertical distance from lowest branch to drain invert ≥ 750 mm (450 mm for 2-storey with 100 mm stack).
• No offsets below topmost appliance unless vented.
• Floor traps: 50 mm seal; branch pipe slope 1:50 to 1:10.

5. Vertical Distances (Clause 6.9.2b)

• Vertical gap between waste branch and soil branch connection ≥ 200 mm.

Summary Table: Trap & Pipe Sizes

IS 5329 - Safety and Compliance Requirements Summary

Key Specifications:

• Materials (Clause 5.1):
  All materials and components must conform to relevant IS standards. If no IS exists, use materials of satisfactory quality acceptable to the owner.

Trap Selection (Clause 6.5.4 & Table 1):

• Minimum internal diameters for waste appliances are critical for safety and functionality:

Compliance Tips:

• Always verify materials against Indian Standards.
• Use correct trap sizes to avoid blockages and maintain hygiene.
• Ensure workmanship quality meets owner’s approval if IS standards are unavailable.

flowchart TD
    A[Materials & Components] --> B{IS Standard Exists?}
    B -- Yes --> C[Use IS Compliant Material]
    B -- No --> D[Use Satisfactory Quality Material]
    C & D --> E[Owner Approval]
    E --> F[Install Traps with Correct Diameter]
    F --> G[Ensure Safety & Compliance]

This ensures safety, hygiene, and durability in plumbing installations as per IS 5329.