CONSTRUCTION AND RECOMMENDED APPLICATION
The WL pumps are vertical impeller pumps. In standard execution the WL pumps are driven by an electric motor of alternating current of frequency 50 Hz or 60 Hz.
Principal dimensions of the pumps and connection pipes are given on the chart and drawings.
The WL pumps are designed to pump media without any foulants, especially sea water, fresh water and oil of viscosities up to 5 oE (corresponding to 38,2 centistokes). In case of using the WL pumps for other media, you are requested to consult GZUT, the producer.
Gzut recommends installing the WL pumps in the following systems:
- cooling fresh water
- cooling sea water
- ballast
- bilge
- fire.
The WL pumps can operate in the systems of manual, automatic and remote control.
High efficiency, reliability and easy maintenance are the most important advantages of the WL pumps.
The shaft bearings lie over the casing, which makes it possible to apply only one mechanical seal and excludes flooding the bearings in case of seal failure.
Compact and simple construction of the pump enables its overhaul without dismantling from the work place and without removinq the motor.
OPERATING RANGE
The WL pumps are designed to pump liquids in the following temperature ranges:
-- for fresh water and oil - up to 85oC,
-- for sea water - up to 45oC.
The WL pumps can operate with the inflow having the foliowing quantites:
- the pumps with the lifting height up to 35 metres ot water column - the inflow up to 20 metres of water column
- the pumps with the lifting height - up to 40 metres of water column - the inflow up to 15 metres of wator column
- the pumps with the lifting height above 40 metres of water column - the inflow up to 10 metres of water column.
The maximum manometric suction head is 5-7 metres of water column (according to the pump size). The maximum manometric suction head is specified for clear medium having the temperature 20oC and at the atmospheric pressure 760 mm Hg.
The maximum manometric suction head and the minimum inflow height according to the temperature of the pumped medium for different pump sizes have been shown on the chart:
| Temperature of pumped medium (oC) | 20 | 40 | 60 | 70 | 85 |
| Hs maximum or minimum inflow (in metres of water column) | 5 | 4 | 1 | -1 | -4.5 |
| 6 | 5 | 2 | 0 | -3.5 | |
| 6.5 | 5.5 | 2.5 | 0.5 | -3.0 | |
| 7 | 6 | 3 | 1 | -2.5 |
The ranges of rated output and pumping height for different WL pump sizes are given on the chart, and diagrams.
The minimum and maximum capacity at which the pump can work continuously is determined by the function of the rated output
Qmin=0.6Qn
Qmax=Xs
where Xs is a factor dependent on the value of the ratio of the maximum manometric suction head for a given pump ( Hs max) to the real suction head at which the pump works (Hs).
| Hs max/Hs | 1 | 1.3 | 1.6 |
| Xs | 1.05 | 1.1 | 1.2 |
In all WL pumps the impeller units are made of corrosion-proof materials such as bronze, stainless steel or plastics.
The WL pump casings are manufactured in two material versions:
- M execution - grey cast iron
- T execution - bronze.
The WL gumps are manufactured in accordance with the regulations and requirements of the following classification societies:
- Polish Register of Shipping
- Lloyd's Register of Shipping
- USSR Register of Shipping.
- Germanischer Lloyd
- Det Norske Veritas
- Bureau Veritas
In case of ordering pumps according to the requirements of other classification societies, you are requested to make earlier agreements with GZUT.
We also guarantee prompt delivery of spare parts.
| pump type 50Hz | pump type 60Hz | nominal output Qn [m3/h] | nominal delivery head Hn [m H2O] 50Hz | nominal delivery head Hn [m H2O] 60Hz | max. manometric suction head [mH2O] | synchronic rotational speed [RPM] 50Hz | synchronic rotational speed [RPM] 60Hz | mass without motor [kg] M | mass without motor [kg] T |
| 25WL15-30 | 25WL25-45 | 25 | 15-30 | 25-45 | 7 | 3000 | 3600 | ||
| 25WL40-50 | 25WL50 | 25 | 40-50 | 50 | 7 | 3000 | 3600 | 90 | 100 |
| 40WL15-30 | 40WL25-45 | 40 | 15-30 | 25-45 | 7 | 3000 | 3600 | ||
| 63WL15-30 | 63WL25-45 | 63 | 15-30 | 25-45 | 7 | 3000 | 3600 | ||
| 40WL55-80 | 40WL80-120 | 40 | 55-80 | 80-120 | 7 | 3000 | 3600 | 300 | 320 |
| 63WL55-80 | 63WL80-120 | 63 | 55-80 | 80-120 | 7 | 3000 | 3600 | 300 | 320 |
| 100WL15-30 | 100WL25-45 | 100 | 15-30 | 25-45 | 7 | 1500 | 1800 | 310 | 340 |
| 160WL15-30 | 160WL25-45 | 160 | 15-30 | 25-45 | 7 | 1500 | 1800 | 310 | 340 |
| 100WL55-80 | 100WL80-120 | 100 | 55-80 | 80-120 | 5 | 3000 | 3600 | 360 | 380 |
| 160WL55-80 | 160WL80-120 | 160 | 55-80 | 80-120 | 6 | 3000 | 3600 | 360 | 380 |
| 250WL15-30 | 250WL25-45 | 250 | 15-30 | 25-45 | 7 | 1500 | 1800 | 420 | 450 |
| 250WL55-80 | 250WL80 | 250 | 55-80 | 80 | 5 | 3000 | 3600 | 400 | 420 |
NOTES:
1. Nominal quantites Qn, Hn, given in chart, relate to a continuous work for clean water at temperature of 20oC and atmospheric pressure 1 kG/dm3.
2. Maximum manometric suction head relates to a temperature of up to 20oC and atmospheric pressure of 760 mm Hg.
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