Code of Practice for Ancillary Structures in Sewerage System, Part IV: Pumping Stations and Pumping Mains (Rising mains)

IS 4111 Part 4 - Scope Summary

• Scope: Covers specifications for materials and construction methods for a specific structural element or component (not explicitly detailed in your context).
• Rounding Off: Final test or analysis values must be rounded per IS 2:1960, maintaining the same number of significant digits as the specified values.

Key Points:

• Materials & Construction: Refer to Clause 8.5 for detailed requirements on materials and construction practices.
• Standard Reference: IS 4111 (Part IV) - 1968 is the governing document.

Rounding Off Rule (IS 2:1960):

• If the next digit is less than 5, round down.
• If 5 or more, round up.
• Maintain significant figures equal to the standard's specified value.

If you need formulas or tables, please specify the structural element or material type covered in this part. The scope clause itself primarily defines applicability and rounding rules.

IS 4111 Part 4: Location of Pumping Stations — Key Points & Specifications

Location Guidelines (Clause 2.1 & 2.3)

• Avoid nuisance: Locate pumping stations as far as possible from residential areas to minimize noise and odor complaints.
• Flood considerations:
  • Site must be above highest recorded flood level.
  • If unavoidable in flood-prone areas, design so motors and critical equipment are above flood level and wet well coping.
• Overflow management: Ensure overflow during power failure drains safely into watercourses without causing flooding or polluting drinking water sources.

Design & Layout (Clause 7.5)

• Equipment should be arranged for easy operation and maintenance.
• Consider access, safety, and space for machinery.

Additional Notes:

• Capacity and detailed design parameters are covered elsewhere in the code.
• Follow IS 2974 (Part I) for machine foundation design.

Summary Table: Location Criteria

flowchart LR
    A[Select General Area] --> B{Flood Prone?}
    B -- Yes --> C[Design motors above flood level]
    B -- No --> D[Site above flood level]
    C --> E[Ensure overflow drains safely]
    D --> E
    E --> F[Locate away from residences]
    F --> G[Plan layout for easy maintenance]

This ensures pumping stations are safe, functional, and community-friendly per IS 4111 (Part IV).

IS 4111 Part 4: Capacity of Pumping Stations - Key Points

1. Rates of Flow (Clause 3.1)

• Capacity must handle daily and seasonal variations.
• Differentiate between sanitary sewage, stormwater, or combined flow.
• Design for peak inflows considering fluctuations.

2. Pumping Capacity (Clause 3.3)

• Select number & capacity of pumps to:
  • Minimize flow rate fluctuations.
  • Avoid frequent start-stop cycles (cutting in and out).
• Use few different pump sizes for economy and easier maintenance.
• Provide standby pumps for reliability.

3. General Specifications

• Locate pumping stations away from residential areas to reduce noise/smell nuisance (Clause 2.3).
• Design for economical operation and ease of repair.

Typical Formula for Pumping Capacity:

[ Q = A \times V ]

Where:

• (Q) = Flow rate (m³/s)
• (A) = Cross-sectional area of the inflow (m²)
• (V) = Velocity of flow (m/s)

Pump Selection Guideline Table (Indicative):

flowchart LR
    A[Inflow Variations] --> B[Calculate Peak Flow Q]
    B --> C[Select Pump Capacity & Number]
    C --> D{Economy & Maintenance}
    D -->|Few Sizes| E[Pump Units]
    D -->|Standby| F[Backup Pump]
    E & F --> G[Pumping Station Operation]

Summary: Design pumping stations per IS 4111 Part 4 to handle peak flows smoothly with minimal pump cycling, using few pump sizes and standby units, while locating stations away from residences to mitigate nuisance.

IS 4111 Part 4: Key Points on Types of Pumps & Equipment

1. Types of Pumps

• Roto-Dynamic Pumps (Clause 4.2):

  • Preferred for sewage pumping.
  • Must conform to forthcoming IS specs for special purpose and sewage pumps.
  • Until then, requirements are mutually agreed upon.

• Electrically Driven Pumps (Clause 6.1):

  • Typically use three-phase induction motors per IS standards.
  • Efficient and reliable for continuous sewage pumping.

• Internal Combustion Engine Driven Pumps (Clause 5.2.2):

  • Diesel Engines: Reliable, heavy, costly, need skilled operation.
  • Gas Engines: Similar to diesel but dependent on gas supply; can use sewage gas as fuel.
  • Petrol Engines: Rarely used due to high fuel/maintenance cost.

2. Pump Controls (Clause 3.3)

• Select pump capacity and number to minimize:
  • Fluctuations in pumping rate.
  • Frequent start/stop cycles.
• Use fewer different sizes to reduce spares and simplify maintenance.

Summary Table: Prime Movers for Sewage Pumps

flowchart TD
    A[Types of Pumps] --> B[Roto-Dynamic Pumps]
    A --> C[Electrically Driven Pumps]
    A --> D[Internal Combustion Engines]
    D --> E[Diesel Engine]
    D --> F[Gas Engine]
    D --> G[Petrol Engine]

For detailed motor specs, refer to IS: 4111 (Part IV) and IS specifications on three-phase induction motors.

IS 4111 Part 4 - Prime Movers for Sewage Pumps: Key Points

Types of Prime Movers (Clause 5.2)

• Electric Motor:

  • Convenient, cheap, reliable.
  • Suitable for all sewage pump types.
  • Refer IS:325-1961 (3-phase induction motors) & IS:4722-1968 (rotating electrical machines).

• Internal Combustion Engines:

  • Diesel: Reliable, efficient, heavy, costly, needs strong foundations & skilled maintenance. Suitable for all pump types.
  • Gas: Similar to diesel but higher running cost; can use sewage gas as fuel; must operate on oil as backup.
  • Petrol: Rarely used due to high fuel and maintenance costs.

Selection Criteria (Clause 5.1)

• Reliability, robustness, efficiency, silent operation.
• Balance capital, running, and maintenance costs.
• Consider power/fuel availability and risk of supply interruption.

Summary Table

Additional Notes

• Diesel & gas engines require robust foundations due to vibration & weight.
• Electric motors preferred where reliable power is available.
• Prime mover choice impacts pump control strategy and overall plant reliability.

flowchart LR
    A[Prime Movers] --> B[Electric Motor]
    A --> C[Internal Combustion Engine]
    C --> D[Diesel Engine]
    C --> E[Gas Engine]
    C --> F[Petrol Engine]
    B --> G[Cheap, Reliable]
    D --> H[Heavy, Efficient]
    E --> I[Uses Sewage Gas]
    F --> J[High Cost, Rare]

For detailed motor specs, refer IS:325 and IS:4722 as per IS 4111 Part

IS 4111 Part 4 - Pump Controls: Key Points & Specifications

1. Manual Control (Clause 6.1.2)

• Manual control must be provided separately or integrated within an automatic control panel.
• Emergency controls include:
  • Stop buttons
  • No-volt release
  • Overload release
  • Phase failure protection

2. Engine Driven Pumps (Clause 6.2)

• Gas/Oil engines may use automatic ignition control.
• Manual control is recommended for internal combustion engines.

3. Pumping Station Prime Movers (Clause 5.2.2)

4. Electrical Motor Specifications

• Refer to IS 4111 (Part IV) and related IS standards for three-phase induction motors and rotating electrical machines.

Summary Diagram: Pump Control System Components

graph LR
A[Pump Control Panel] --> B[Manual Control]
A --> C[Automatic Control]
B --> D[Stop Button]
B --> E[No-Volt Release]
B --> F[Overload Protection]
B --> G[Phase Failure Protection]
C --> H[Engine Ignition Control]

For detailed electrical design, consult IS 4111 Part 4 and IS 325 (motors), ensuring compliance with emergency and operational safety controls.

IS 4111 (Part IV) - Design & Layout of Pumping Stations: Key Points

1. Layout Considerations (Clause 7.5)

• Equipment positioning must allow easy operation and maintenance.
• Adequate access space around pumps, valves, and pipework.
• Consider safe and convenient access for inspection and repairs.

2. Location (Clause 2)

• Pumping stations should be sited considering topography, flood levels, and ease of sewer connection.
• Avoid locations prone to flooding or difficult access.

3. Design Specifications

• Foundation design follows Code of Practice for Machine Foundations (Part I) for reciprocating machines.
• Safety provisions for electrical and mechanical equipment as per relevant IS codes.

4. Typical Design Formulae & Tables (General Practice)

5. Safety & Equipment

• Include valves, air release valves, and non-return valves.
• Provide ventilation and lighting in pump rooms.

flowchart LR
    A[Inlet Sewer] --> B[Pumping Station]
    B --> C[Pump Equipment]
    C --> D[Discharge Pipe (Rising Main)]
    D --> E[Outfall / Treatment Plant]
    B --> F[Maintenance Access]

For detailed tables and exact dimensions, refer to the full IS 4111 Part IV document and related machine foundation codes.

IS 4111 Part 4: Pumping Mains (Rising Mains) - Key Points

1. Suction Pipe Arrangement (Clause 7.5.2.5)

• Minimum distance between suction pipes inside sump:
  [ \text{Centre to centre} \geq \max(5 \times \text{diameter}, 50, \text{cm}) ]

2. Pumping Mains (Rising Mains) - General Specifications

• Rising mains convey pumped fluid vertically or at an incline from the pump to the discharge point.
• Pipes must withstand pressure surges (water hammer) and be corrosion resistant.
• Proper anchoring and thrust blocks are essential at bends and changes in direction.

3. Hydraulic Design Formulas for Rising Mains

• Head loss due to friction (Darcy-Weisbach equation):
  [ h_f = f \frac{L}{D} \frac{v^2}{2g} ] where:

  • (h_f) = head loss (m)
  • (f) = friction factor (from Moody chart)
  • (L) = length of pipe (m)
  • (D) = diameter of pipe (m)
  • (v) = velocity of flow (m/s)
  • (g) = acceleration due to gravity (9.81 m/s²)

• Total dynamic head (TDH):
  [ H = H_s + h_f + H_v ] where:

  • (H_s) = static head (vertical height)
  • (h_f) = friction head loss
  • (H_v) = velocity head (usually small)

4. Material & Thickness (Typical)

• Pipes: Cast iron, steel, or ductile iron, per IS standards.
• Thickness depends on working pressure; refer to IS 3589 for pipe thickness classes.

Diagram: Rising Main Layout

flowchart TB
    Pump -->|Rising Main| VerticalPipe[Vertical Pipe]
    VerticalPipe -->|Discharge| Outlet[Discharge Point]
    Pump -.->|Suction Pipe| Sump[Sump with Suction Pipes]
    Sump -->|Minimum spacing

IS 4111 Part 4 (1968) - Valves and Accessories: Key Points

Valve Installation & Positioning (Clauses 7.5.2.2, 8.4)

• Sluice Valves:
  • On horizontal pipelines, max 45° inclination to vertical.
  • Hand wheels hard to reach → use spindle extensions with universal joints and offset head-stocks for convenient operation.
• Reflux (Non-return) Valves:
  • Installed close to the pump, on horizontal pipe sections, immediately above the pump to reduce water hammer.
• Valve Locations on Pumping Mains:
  • Reflux valves: near pump, horizontal pipe.
  • Sluice valves: suction side of pump and above reflux valve for isolation.
  • Air valves: at summit points to release trapped air.
  • Wash-out valves: at low points for drainage, emergency use only.

Accessories & Construction (Clauses 7.5.2.3, 7.5.2.4)

• Standard Specials: Must comply with IS 1538-1969 (cast iron fittings).
• Flexible Joints: Recommended where pipes pass valves to avoid fracture.
• Puddle Flange: Should be built into the wall at pipe passages for sealing.

Summary Table: Valve Types & Positioning

flowchart LR
    PUMP -->|Suction side| SV[Sluice Valve]
    PUMP -->|Above pump| RV[Reflux Valve]
    MAIN -->|Summit points| AV[Air Valve]
    MAIN -->|Low points| WOV[Wash-out Valve]
    SV -->|Isolate sections| MAIN

This ensures valve accessibility, operational

IS 4111 Part 4 (1968) - Flow Measurement & Recorders Key Points

Flow Measurement Locations (Clause 7.4)

• Flow can be measured at:
  • Connecting sewer
  • Inlet to pumping station
  • Rising main
  • Delivery end
• Devices used:
  • Flumes or Weirs: at inlet/discharge for open channel flow
  • Venturi meters or Orifice plates: on rising mains (pressurized flow)

Flow Recording

• Recording/integrating devices can be installed on these meters for continuous monitoring.

Flow Data for Pumping Stations (Clause 3.2)

• Obtain long-term flow records before adding pumping stations.
• Use historical data to estimate future flow conditions.

Standards for Fittings (Clause 7.5.2.3)

• Use standard specials complying with IS 1538:1969 for cast iron fittings on pressure pipes.

Common Flow Measurement Formulas

Where:

• (Q) = flow rate
• (C_d) = discharge coefficient
• (L) = length of weir crest
• (H) = head over weir crest
• (A, A_1, A_2) = cross-sectional areas
• (\Delta P) = pressure difference
• (\rho) = fluid density
• (g) = acceleration due to gravity

flowchart LR
    A[Flow Measurement Locations]
    A --> B[Connecting Sewer]
    A --> C[Inlet to Station

Noise and Nuisance Considerations in Sewage Pumping Stations (IS 4111 Part 4)

• Location:

  • Pumping stations should be located far from residential areas to minimize noise and smell complaints (Clause 2.3).

• Noise Reduction:

  • Use special silent motors.
  • Install double windows to reduce noise transmission (Clause 7.3.5.2).

• Vibration Control:

  • Modern pumping sets on individual foundation blocks produce negligible vibration.
  • If vibration occurs, insulate foundation from building using methods per IS 2974 (Part 1)-1964 (Clause 7.3.5.4).

Summary Table: Noise & Nuisance Control Measures

Vibration Isolation Concept (Mermaid Diagram)

graph LR
A[Pumping Set] --> B[Individual Foundation Block]
B --> C[Isolation Layer]
C --> D[Building Structure]

• Isolation Layer prevents vibration transmission to building.

For detailed vibration isolation design, refer to IS 2974 (Part I).

IS 4111 Part 4: Safety and Maintenance Key Points

1. Electrical Safety (Clause 9.3.2)

• Wiring & Equipment: Must be properly insulated and grounded.
• Switches & Controls: Use non-sparking types.
• Hazardous Areas: All wiring and devices must be explosion-proof.

2. Layout for Maintenance (Clause 7.5)

• Equipment and pipework in pumping stations should be arranged for ease of operation and maintenance.

3. Materials and Construction (Clause 8.5)

• Use durable materials suitable for sewage environment.
• Construction should facilitate inspection, cleaning, and repair.

Summary Table: Electrical Safety Requirements

Maintenance Layout Principles

• Clear access to pumps and valves.
• Space for removal and replacement of parts.
• Safe working clearances.

flowchart LR
    A[Pump Station Layout] --> B[Equipment Access]
    B --> C{Maintenance Ease}
    C --> D[Clearance for Operators]
    C --> E[Space for Equipment Removal]
    C --> F[Safe Electrical Installations]

Note: For detailed machine foundation design, refer to the updated IS 2974 series.

This concise guidance ensures operational safety and maintenance efficiency per IS 4111 Part 4.

IS 4111 Part 4: Architectural and Landscaping Guidelines

Key Points from Clauses:

• Clause 7.3.4:

  • The superstructure of pumping stations must have an attractive architectural finish.
  • Landscaping around the structure is highly recommended to blend with surroundings.

• Clause 8.5 (Materials and Construction):

  • Use durable, weather-resistant materials suitable for local climate.
  • Construction must ensure structural integrity and aesthetic appeal.

General Specifications:

• Architectural Finish:

  • Use of plastering, painting, or cladding for smooth, clean surfaces.
  • Color schemes should be harmonious with the environment.
  • Avoid exposed raw concrete or rusting metals.

• Landscaping Guidelines:

  • Plant native species for easy maintenance.
  • Provide green buffers to reduce noise and visual impact.
  • Incorporate pathways and lighting for accessibility and safety.

No explicit formulas or tables are provided in IS 4111 Part 4 for architectural or landscaping aspects. Use standard landscaping design principles and local architectural codes.

flowchart LR
    A[Pumping Station Superstructure]
    A --> B[Architectural Finish]
    B --> C[Durable Materials]
    B --> D[Color Harmony]
    A --> E[Landscaping]
    E --> F[Native Plants]
    E --> G[Green Buffer Zones]
    E --> H[Pathways & Lighting]

Summary: IS 4111 Part 4 emphasizes aesthetic treatment and landscaping for pumping stations, recommending durable materials and harmonious design without prescribing specific formulas or tables.