ZW40-15-30 Self-Priming Sewage Pump: Checklist Before Ordering
ZW40-15-30: 15 m³/h at 30 m, 3 kW, DN40/DN32. Six points to confirm before you order a ZW self-priming pump.
15
Flow Rate (m³/h)
30
Head (m)
3
Power (kW)
ZW Self-Priming Sewage Pump
ZW40-20-15 Self-Priming Sewage Pump: First Start Step by Step
Model: ZW40-20-15
ZW40-20-15 moves 20 m³/h at 15 m on 2.2 kW. Step-by-step first start, from filling the casing to checking rotation.
Specifications
| Flow Rate | 20m³/h |
|---|---|
| Head | 15m |
| Power | 2.2kW |
| Inlet / Outlet Diameter | 40 / 32mm |
| Material | Cast iron (standard); stainless steel on request |
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Product Overview
ZW40-20-15 gives the most flow of the DN40 models: 20 m³/h at 15 m head on 2.2 kW. Getting the first start right is simple if you follow the order below.
- Check that the base, coupling and bearing housing bolts are tight. Tighten anything that has loosened in transport.
- Turn the coupling by hand. It should turn freely with no rubbing or noise.
- Open the filling valve on top of the pump and fill the casing with liquid to at least two thirds of its volume. Close the valve. This is done once; later starts do not need it.
- Switch on briefly and check the rotation. Seen from the motor end it must turn clockwise. Never let it run in reverse.
- Start the pump and watch it for the first minutes. If anything sounds or looks wrong, stop and find the cause.
After this, the pump keeps liquid in its casing between runs and primes itself each time.
Technical data
| Item | ZW40-20-15 |
|---|---|
| Flow | 20 m³/h |
| Head | 15 m |
| Motor power | 2.2 kW |
| Speed | 2900 r/min |
| Efficiency | 45 % |
| NPSHr | 2.5 m |
| Self-priming height | 5.5 m |
| Self-priming time | 3 min per 5 m |
| Suction / discharge | DN40 / DN32 |
| Weight | 100 kg |
Installation dimensions (mm)
The pump, coupling and motor are mounted on a common base. L is the overall length; L1 to L4 are base lengths; a and f locate the outlet; B1 and B2 are the base widths; H is the shaft centre height; h1 and h2 are the heights of the suction and discharge flanges; h3 is the base thickness.
| L | L1 | L2 | L3 | L4 | a | f | B1 | B2 | H | h1 | h2 | h3 | Base bolts | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ZW40-20-15 | 850 | 680 | 115 | 450 | 240 | 255 | 510 | 310 | 370 | 228 | 410 | 625 | 24 | 4×Ø18 |
Flange dimensions (mm)
| Flange | DN | Outer dia. D | Bolt circle | Raised face | Thickness b | Face height f | Bolts n×d |
|---|---|---|---|---|---|---|---|
| Suction | 40 | 130 | 100 | 80 | 14 | 2 | 4×Ø14 |
| Discharge | 32 | 120 | 90 | 70 | 14 | 2 | 4×Ø14 |
Typical Applications
- pit and sump drainage
- low-lift sewage transfer
- aquaculture ponds
- site drainage
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