MATERIALS HANDLING
the power transmission between the gearbox and the plungers. A newly designed double helical gearing also contributes to the increased running smoothness of the pumps. All component parts are produced in-house. The new construction has been successively
rolled out over the past few years in the form of the triplex pump programme, with power ratings ranging from 80 to 800kW. This also forms the basis for the drive construction of the quintuplex pumps, which the company has now developed ready for serial production, enabling considerable cost savings for users of large volume flow pumps. The mechanical part of the drive system creates the
prerequisites needed for the variable speed control of the pumps. The large-dimensioned crossheads are part of the construction details of the power transmissions, which exerts a lower surface pressure. They allow excellent hydrodynamic lubrication of the pump transmission where most of the load arises, even at low speeds, i.e. low rotational speed. For this reason, a Kamat plunger pump can work
with full rod force at rotational speeds ranging from 10 to 100%. It is therefore able to adapt very well to the volume flow required at the time.
THE CONTROL MAKES THE DIFFERENCE These pumps can now be used as the appropriate basis for setting up a highly efficient regulation system. If two high pressure pumps are used, the speed of the master pump is controlled via a frequency converter. As soon as the demand exceeds the delivery capacity of the master, the basic load is taken over by a slave pump. Thus, a single speed-controlled pump will suffice and at the same time cover a very large range to be regulated, which represents a quite considerable cost advantage. Another very important
factor is the type of regulation, more specifically achieving appropriate control of the flow rate. Bypass valves are used here as a standard solution, which work using a ‘black and white’ technique and either guide 100% of the flow rate to the consumer or to the tank. In practice, this can be achieved three times in 10 seconds and – considering the high pressures and high flow rates – places a very considerable stress on the entire system: almost like an endurance test for pump, piping, valves and tank.
Kamat can control variable pumping stations far
more elegantly via a pressure sensor and a frequency converter. The bypass valve does not have to be able to switch over to adjust to the rate of flow. This has been shown to reduce wear and tear by about 90%, which considerably reduces costs and increases the availability of these pumps.
DESIGNED TO BE DURABLE Other characteristics of the plunger pumps include their ability to operate horizontally and vertically. The ductile cast iron housings can be used for a wide temperature range and the user can expect a long service life, even under extreme environmental conditions. All models comply with common international pump standards and are optionally available in an ATEX version. They are also suitable for pumping corrosive, abrasive and volatile fluids. With this range of properties, the new drive concept
offers customers clear advantages in terms of efficiency, service life, servicing, total cost of ownership and, of course, noise level. These benefits are increasingly being valued in the process technology sector. The pumps can be used, for example, in high-pressure homogenisation (up to 3,500 bar), in gas washers, to remove deposits using water under pressure and in reverse osmosis systems, and in this case distinctly lower pump-related operating costs – thanks to the principle they use of high efficiency, as well as their robust construction and good controllability. n
Jan Sprakel is managing director of Kamat.
www.kamat.de
The 400kW K40000 pump with split gearbox
www.engineerlive.com 27
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