Sewage Pump Station Design

Sewage flow, sump volume, economy pool, lift height and pump head for self-priming and suction pump stations.

Avg flow = quota·population/86400; max = avg·KZ; each pump = max/pumps; sump = pump·60·6/1000; area = sump/2. Velocity and slope come from tables; bury depth, loss coefficient, station loss and safe head are design values.

1. Self-priming pump station Flow rate & sump volume

Sewage quota (L/d·person)

Population (persons)

Total variation KZ

Number of pumps

Avg flow (L/s)

—

L/s

Max flow (L/s)

—

L/s

Each pump capacity (L/s)

—

L/s

Sump volume (6 min, m³)

—

m³

Sump area (H=2 m, m²)

—

m²

1.2 Lift height

Grate head loss (m)

Discharge water level (m)

Inlet pipe invert (m)

Inlet diameter DN (mm)

Fill ratio H/DN

Normal level in sump (m)

Lift height (m)

—

1.3 Discharge pipeline

Design pipe length (m)

Sump effective depth (m)

Ground level at pump house (m)

Outlet pipe centre bury (m)

Slope i

Friction loss coefficient

Discharge pipe head loss (m)

—

1.4 Pump head

In-station pipe loss (m)

Safe head (m)

Pump head (m)

—

2. Suction (non-self-priming) pump station 2.1 Flow rate & sump volume

Sewage quota (L/d·person)

Population (persons)

Total variation KZ

Number of pumps

Pool width (m)

Avg flow (L/s)

—

L/s

Max flow (L/s)

—

L/s

Each pump capacity (L/s)

—

L/s

Sump volume (6 min, m³)

—

m³

Sump area (m²)

—

m²

Pool length (m)

—

2.2 Lift, suction & pump axis

Grate head loss (m)

Discharge water level (m)

Inlet pipe invert (m)

Inlet diameter DN (mm)

Fill ratio H/DN

Normal level in sump (m)

Suction lift height (m)

In/out pipe height diff (m)

Pipe diameter (m)

Lift height (m)

—

Pump axis elevation (m)

—

Suction pipe invert (m)

—

2.3 Suction & discharge segment losses

Discharge lift (m)

Discharge segment length (m)

Slope i

Local loss coefficient

Suction lift head (m)

Suction segment length (m)

Discharge water level (m)

Ground-water level (m)

Main discharge pipe dia (m)

Discharge pipe dia (m)

Discharge friction loss (m)

—

Discharge local loss (m)

—

Suction friction loss (m)

—

Suction local loss (m)

—

Total head (m)

—

Self-priming lift = discharge water level − (inlet invert + DN·fill/1000 − grate loss − normal level). Discharge pipe loss = (length + (water level − eff. depth − ground + bury))·slope·(1 + coeff). Pump head = station loss + safe head + lift + discharge loss.

Suction case: total head = discharge water level + main dia − discharge dia/2 − ground-water level − normal level + suction friction + suction local + discharge friction + discharge local.