Sewage Pumping Mains

Hydraulic Analysis have undertaken thousands of steady and unsteady flow studies of sewage pumping mains since 1969. A typical study will normally address the following issues:

  • Calculation of systems characteristics for different operating conditions, including variation in sump levels and pipeline roughness condition.

  • Pump selection to confirm chosen units are capable of achieving duty flowrate for all operating conditions.

  • Confirmation that surge pressures remain within pipeline rating or, if necessary, calibrate a suitable method of surge suppression.

  • Air valve sizing and selection.

  • Pump non-return valve selection.

  • Septicity / sedimentation calculations based upon achievable self cleansing velocity in any drained pipe sections.

  • Optimisation of sump levels to prevent pumps de-watering or to ensure adequate self cleansing on a regular basis.

  • Pump NPSH calculations.

  • Pipe diameter and pipe gradient optimisation for drained sections.