Pumps that leave the factory at Rodelta are individually tested at our test laboratory to ensure that they deliver what was promised to the customer. This test bed is fully compliant to the latest API and Hydraulic Institute test requirements and standards.
Between bearing pumps – The impellers of BB pumps are suspended in between the supports. For all pumps of this type, the impeller is placed horizontally, in plane with the bearings.
Overhung pumps – The impellers of these pumps protrude from the bearings. The support has to take care of all forces, e.g. the overhung mass and the rotor dynamic and hydraulic forces. The impellers of these pumps can be mounted either horizontally or vertically.
Vertically suspended pumps – VS pumps are supported above the medium to be pumped. The vertically oriented impellers are suspended below the support and are submerged into the medium.
To reliably test various types of pumps it is necessary to have several test loops. Some pumps require different environments to be tested properly. Most pumps are tested on an open-pit test bed. This means the pump is mounted next to a pit and draws water from it. Through a series of valves and measurement devices, the performance of the pump can be established. The main advantage of this is quick setup times and large volume pumps can be handled. The downside to this is that testing these pumps with lower than atmospheric inlet pressure can be a challenge due to dissolved air in the water. Another plus is that this set-up mimics most of the set-ups of water pumps in the field, therefore it yields a proper replication of the pump performance on-site.
The main advantage of a closed test loop is that all the air in the water can be removed, resulting in more accurate NPSH measurements up to one twentieth of the normal atmospheric pressure. Also, the inlet pressure can be increased to investigate the performance impact of the inlet pressure on the performance of the pump or simulate actual inlet pressures on-site.
To accurately test the performance of the pumps, all equipment is calibrated within the specifications of the HI standards and the layout is made in such a manner that the highest measuring accuracy is acquired. Since efficiency of pumps is becoming more and more important in the field of pumps it is necessary that the measurements to the pumps are as qualitatively correct as possible. That’s why Rodelta chooses for a Three Watt power measurement and very accurate flow and pressure measurers. This ensures we can perfectly measure the performance of the pump and ensures that the customer gets what was offered. That is why Rodelta values good and honest measurements of their products. It contributes to even better Rodelta pump products in the future.