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IS 17424 : 2020Code of practice for sewage pumping stations (First Revision)

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WEF MOP FD-4, 5th Edition (2018) · WSA 04 · Recommended Standards for Wastewater Facilities (2021 Edition)
CurrentEssentialCode of PracticeBIMEnvironmental · Environmental and Sanitation
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IS 17424:2020 is the Indian Standard (BIS) for sewage pumping stations (first revision). This code of practice provides guidelines for the planning, design, construction, operation, and maintenance of sewage pumping stations. It covers key aspects such as station location, hydraulic and structural design of wet and dry wells, pump selection, and associated electrical and mechanical components. The standard aims to ensure efficient, reliable, and safe collection and conveyance of sewage.

Provides a comprehensive code of practice for the design, construction, installation, operation, and maintenance of sewage pumping stations.

Overview

Status
Current
Usage level
Essential
Domain
Environmental — Environmental and Sanitation
Type
Code of Practice
International equivalents
WEF MOP FD-4, 5th Edition (2018) · Water Environment Federation (WEF), USAWSA 04-2020 · Water Services Association of Australia (WSAA), AustraliaRecommended Standards for Wastewater Facilities (2021 Edition) · Great Lakes-Upper Mississippi River Board (Ten States Standards), USABS EN 752:2017 · British Standards Institution / European Committee for Standardization, UK/EU
Typically used with
IS 456IS 5329IS 8329IS 4984IS 1520
Also on InfraLens for IS 17424
5Key values3Tables4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! Careful design of the wet well, particularly the floor slope and benching, is crucial to prevent the deposition of solids and subsequent septicity, which are common and severe operational problems.
! The selection of pump type (e.g., non-clog, chopper, grinder) is critical and must be based on the characteristics of the raw sewage, especially the expected solid content and size.
! Ensure adequate and safe ventilation is provided for all enclosed spaces, particularly the wet well, to disperse hazardous gases like H2S and methane.
Frequently referenced clauses
Cl. 5Location and Layout of Pumping StationCl. 6Design ConsiderationsCl. 7Pumps and Pumping EquipmentCl. 8Piping, Valves and FittingsCl. 10Operation and Maintenance
Pulled from IS 17424:2020. Browse the full clause & table index below in Tables & Referenced Sections.
concretesteelpumpspipesvalves

International Equivalents

Similar International Standards
WEF MOP FD-4, 5th Edition (2018)Water Environment Federation (WEF), USA
HighCurrent
Design of Wastewater and Stormwater Pumping Stations
Comprehensive design manual for wastewater pumping stations, covering hydraulics, structures, pumps, and controls.
WSA 04-2020Water Services Association of Australia (WSAA), Australia
HighCurrent
Sewage Pumping Station Code of Australia Version 4.0
A national code specifying requirements for the design, construction, and commissioning of sewage pumping stations.
Recommended Standards for Wastewater Facilities (2021 Edition)Great Lakes-Upper Mississippi River Board (Ten States Standards), USA
HighCurrent
Recommended Standards for Wastewater Facilities
Widely adopted US guidelines covering design requirements for wastewater facilities, including a dedicated chapter on pumping stations.
BS EN 752:2017British Standards Institution / European Committee for Standardization, UK/EU
MediumCurrent
Drain and sewer systems outside buildings - Sewer system management
Covers overall sewer system management, with principles applicable to pumping station function within the network, but less design detail.
Key Differences
≠IS 17424 explicitly references the CPHEEO Manual on Sewerage and Sewage Treatment for population forecasting and peaking factor determination, whereas international standards like WEF MOP FD-4 provide their own empirical formulas or curves (e.g., Babbitt, Harmon) for calculating peaking factors.
≠IS 17424 mandates a minimum self-cleansing velocity of 0.9 m/s in the rising main. While this is a common target, some international standards like the Ten States Standards accept a slightly lower minimum of 0.6 m/s (2 ft/s) to reduce friction losses and energy costs, especially in smaller systems.
≠The Indian standard specifies pump redundancy based on the number of working pumps (e.g., one standby for up to two working pumps, two standbys for more than two). International standards often use a more flexible 'N+1' or 'N+2' approach based on flow, criticality, and reliability analysis, which may result in different standby configurations.
≠Material specifications, electrical installations, and safety protocols in IS 17424 are tied to other Indian Standards (e.g., IS 458 for pipes, Indian Electricity Rules). International equivalents reference their respective national codes (e.g., ASTM, ANSI in the US; BS, EN in Europe), leading to differences in specified materials, cable types, and hazardous area classifications.
Key Similarities
≈All standards emphasize the fundamental principle of selecting solids-handling (non-clog) centrifugal pumps and matching them to the system head curve for efficient operation.
≈There is a universal consensus on wet well design principles, including providing sloped floors (benching), hopper bottoms, and smooth fillets to prevent solids deposition and minimizing detention time (typically < 30 minutes) to prevent septicity and odour.
≈The requirement for emergency operation provisions is a key similarity. All standards mandate standby power sources (like diesel generators) and/or sufficient emergency storage volume to manage flows during power outages or primary equipment failure.
≈A strong focus on operator safety is common across all standards, with detailed requirements for safe access, mechanical ventilation of confined spaces, fall protection, and equipment for lifting heavy components like pumps and motors.
Parameter Comparison
ParameterIS ValueInternationalSource
Minimum Diameter of Rising Main100 mm100 mm (4 inches)Ten States Standards
Minimum Self-Cleansing Velocity in Rising Main0.9 m/s0.6 m/s (2 ft/s)Ten States Standards
Maximum Pump Starts per Hour (Small/Medium Motors)6 to 10Typically 6 to 15 (varies by motor size)WEF MOP FD-4
Maximum Detention Time in Wet Well (at Avg. Flow)30 minutes10 to 30 minutesTen States Standards / WEF MOP FD-4
Minimum Slope for Wet Well Floor Benching1V:1H (45 degrees)Steeply sloped, often recommended as 1V:1HWEF MOP FD-4
Bar Spacing for Medium Screens15 mm to 25 mm15 mm to 40 mm (0.6 to 1.5 inches)WEF MOP FD-4
Minimum Air Changes per Hour (Dry Well, Continuous)66Ten States Standards
⚠ Verify details from original standards before use

Key Values5

Quick Reference Values
Minimum self-cleansing velocity in rising main0.8 m/s
Maximum detention time in wet well at average flow30 minutes
Maximum number of starts per hour for pump motors6 to 15 (depending on size)
Minimum freeboard in wet well0.6 m
Minimum diameter for suction pipe100 mm
Key Formulas
Total Head (H) = Static Head (Hs) + Friction Head (Hf) + Minor Losses (Hm)
Wet Well Volume (V) = (q/4) * (T/N)
Friction Head (Hf) = f * (L/D) * (v^2/2g) — Darcy-Weisbach equation

Tables & Referenced Sections

Key Tables
Table 1 - Recommended Velocities in Rising Main
Table 2 - Typical Design Parameters for Wet Well
Table 4 - Recommended Number of Pumping Units
Key Clauses
Clause 5 - Location and Layout of Pumping Station
Clause 6 - Design Considerations
Clause 7 - Pumps and Pumping Equipment
Clause 8 - Piping, Valves and Fittings
Clause 10 - Operation and Maintenance

Related Resources on InfraLens

Cross-Referenced Codes
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IS 8329:2020Centrifugally Cast (Spun) Ductile Iron Pressu...
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IS 4984:2016High density polyethylene (HDPE) pipes for po...
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IS 1520:1994Horizontal Steel Tanks for Storage of Petrole...
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Frequently Asked Questions4

What is the minimum number of pumps required for a sewage pumping station?+
A minimum of two identical pumps are required, one operating and one as standby. For larger stations, more units may be necessary (Clause 7.2).
What is the recommended minimum velocity in the discharge pipe (rising main)?+
A minimum self-cleansing velocity of 0.8 m/s should be maintained to prevent solids from settling in the pipe (Clause 6.3.2).
What is the maximum recommended detention time in the wet well?+
The detention time should be minimized to prevent sewage from turning septic, typically not exceeding 30 minutes at average flow (Clause 6.4.1).
Are screens necessary at a pumping station?+
Yes, screens are generally required upstream of the wet well to protect pumps from large solids, rags, and debris that can cause clogging and damage (Clause 6.7).

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