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2 Appendix A the attributes are obtained for handling non-aerated water at 20C and viscosity v = 1 mm2/s the pump characteristics H=f(Q) include hydraulic losses at the pump inlet and the non-return valve which is integrated in the pump power characteristics P=f(Q) show a typical power intake by a single pump phase effi ciency qualities =f(Q) describe a single hydraulic phase of a pump with a nominal-diameter impeller; without taking into account any losses at the pump inlet and the non-return valve the pump effi ciency for numerous phases or with trimmed impellers is lower than that shown in this brochure and the effi ciency attributes =f [Q] may be offered by the manufacturer if requested by the customer the pump works without cavitation if the needed NPSH cavitation reserve plus the liquid column 0,5-1m is kept for managing liquids other than water please get in touch with the manufacturer: dealing with liquids of which the density and viscosity are greater than those of water will trigger an increased requirement for power at submersible well pumps the pump shaft, for that reason, a motor with a greater power output needs to be utilized.

Th erefore, intermediate characteristics, obtained by the nominal impeller trimming, are introduced in GC, GD and GF deep-well pumps. In the GC and GD pumps having up to 9 stages, the prospering trimmings are denoted by the letters A, B, C and in the GF pump the prospering impeller trimmings are signified by the digits 1 to 5.

If you have an interest in pumps with more than 9 phases and having trimmed impellers, please contact the pump unit producer. Design of deep-well pumps Deep-well pumps are a multistage kind of pumps, built in series. Th ey are installed on submersible motors, therefore, they are likewise described as submersible units.

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Th e specifi c pump phases are set up aft er the suction casing. Th e pump is closed with the non-return valve housing and the discharge casing to link the pump unit to the discharge pipe using either fl anges or a threaded connection.

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Range sleeves are supplied to properly position the impeller in the stator and pump case. Th e rotating system of the pump has steel-and-rubber bearing bushes. Depending upon the deep-well pump type, the pump stages may be linked using either: connecting tapes (the GAB, GB, GBC, GC and GCA pumps), or double-nutted bolts (the GDB, GDC and GFB pumps) - specific phases.

Th ey are compact and extremely trustworthy. Th ey have the following benefits: low expense (the bore-holes have very small diameters, no structures over the well are required), low operating expense, easy operation (no lubrication points), quickly and basic assembly and disassembly. Deep-well pumps have actually been made by HYDRO-VACUUM S.A.

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Experience and continuous enhancement eff ort have resulted in a series of deep-well pumps of which the operating characteristics and service life are similar to those of European products. Th ey are utilized in a number of applications all over Poland: in municipal drinking water supply, in towns, in housing estates, in farming and gardening.

At present, they are used in other strip mines and in the building and construction industry, where low subsoil water levels are needed in deep foundation trenches. Materials of building Pump type Casings Middle casing Stator Impellers Shaft & Coupling Bearing Product of construction Product of building and construction Material of building and construction Product of building Material of construction Material of building 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 GAB.2 brass cast iron - - s.steel - - Lexan Lexan - - Lexan Lexan - - stainless steel rubber/stainless steel GAB.4 brass cast iron - - s. steel s. steel - - Lexan Lexan - - Lexan Lexan - - GAB.5 brass cast iron - - s. steel s. steel - - Noryl Noryl - - Noryl Noryl - - GB.0 cast iron - - - cast iron - - - Lexan - - - Lexan - - - GBC.0 brass - - - s.steel - - - Lexan - - - Lexan - - - GBA.2 cast iron - - - cast iron - - - Lexan - - - Lexan - - - GBC.2 brass - - - s. steel - - - Lexan - - - Lexan Lexan - - GBC.3 brass cast iron - - s.bronze sfero.