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.
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
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.