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Pump unit protection systems
To minimize maintenance and production costs, we strongly recommend installing monitoring and protection systems:
All additional devices are covered with a permanent PP layer, which covers a very wide range of applications – metal parts do not come into contact with the pumped liquid. All reinforcing parts are made of 316 stainless steel.
For highly abrasive liquids (high solids content), HMPE parts can be ordered.
For very aggressive liquids at high temperatures, we can offer PVDF.
TYPICAL APPLICATIONS
To minimize maintenance and production costs, we strongly recommend installing monitoring and protection systems:
All additional devices are covered with a permanent PP layer, which covers a very wide range of applications – metal parts do not come into contact with the pumped liquid. All reinforcing parts are made of 316 stainless steel.
For highly abrasive liquids (high solids content), HMPE parts can be ordered.
For very aggressive liquids at high temperatures, we can offer PVDF.
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Dry run protection/pressure sensor
Low and high pressure safety valves protect the installation against excessive pressure build-up. They can also be connected in such a way as to generate an audible and visual alarm when low or high pressure occurs. The device is ideal for protecting pumping equipment that can be damaged by cavitation, dry running or increased pressure. The device containing the diaphragm pressure sensor is installed on the discharge pipe, which is attached to the pump by means of a tee with a threaded fitting.
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The device must be connected to an electromagnetic relay, which can be built-in or connected to a junction box, which controls the power supply to the pump motor. It can be used with any single or three-phase motor. Installation of a tee for mounting the switching unit in the pipeline can be supplied in all sizes for both metallic and plastic materials.
Cavitation and dry running
If cavitation occurs or the pump runs dry, the outlet pressure will drop; this process activates the pressure sensor and, by means of an electromagnetic relay, switches off the power supply to the pump. An adjustment screw available under the cover on the block head allows the pressure sensor to operate at a specific pressure drop. The minimum outlet pressure should be 0.2 bar. The pressure sensor is designed to work with clean, non-crystallizing liquids.
For liquids containing solid particles or crystallizing liquids, an intermediate chamber containing a diaphragm can be used, through which the pressure change in the line is transmitted to the signal device. The advantage of the intermediate chamber is that it has large open surface area limits for liquid flow, thus significantly reducing the likelihood of clogging.
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Visual control system with emergency shutdown capability.
The diaphragm sensor can be used for neutral or chemically aggressive liquids. All parts in contact with the medium are made of highly corrosion-resistant plastic or stainless steel. There is no contact between the sensor and the liquid. The sensor is separated from the liquid by a diaphragm. Pressure transfer takes place via a buffer solution. The large diaphragm surface area, combined with the very low compressibility of the buffer solution, ensures a very accurate indication. The device is installed on the discharge pipe near the pump using an external threaded ½” tee. Thanks to its special design, the device can be rotated 360° for a more convenient reading position.
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Sensors are also available with contact switches (MKM code) to protect against dry running of pumps or overpressure control, e.g., in filtration systems. If the injection pressure rises or falls, the pressure switch activates, and the pump shuts down via an electromagnetic relay. The sensor must be connected to an electromagnetic relay, which can be built-in or connected to a distribution box controlling the electrical supply to the pump motor.
The pressure sensor is designed to work with clean, non-crystallizing liquids. For liquids containing suspended solids or prone to crystallization, the device can be made with an intermediate chamber containing a diaphragm, through which pressure changes are transmitted to the switch. The advantage of the intermediate chamber is that it has a less restricted contact surface with the liquid, thus significantly reducing the likelihood of clogging.
Applications
Priming units allow self-priming of centrifugal pumps. It is possible to calculate the required volume of each suction installation element. We offer a wide range of standard suction installations and manufacture custom-built units (e.g., 500 l). When the pump is full, it can immediately prime through the suction line and release air through the discharge line. For priming to occur automatically at every start-up, it is essential to switch off the pump before the priming element is emptied. To ensure this procedure, as well as to protect the pump, we can advise on additional equipment.
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Materials Polypropylene (PPH) is used as standard, covering a wide range of applications. For handling particularly chemically aggressive liquids at high temperatures, even the tank can be made entirely of PVDF. EPDM seals are standard.
Max working pressure at 20 °C: from -0.8 to 2 bar Recommended flow in the suction line: 1 m/s |
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Suction line filters primarily serve to protect the pump from the effects of solid particles. The presence of a filter can prevent serious damage to the pump, thus reducing maintenance costs and downtime.
All filters are designed according to the recommended maximum flow rate for centrifugal pumps. The pressure drop in the filter basket is very small, therefore the filters are suitable for processes with higher liquid temperatures and low NPSHa values. We offer a wide range of standard products, but we also manufacture custom-made devices. In situations where there is a low NPSHa value, we can adapt a special filter. |
Materials
Polypropylene (PPH) is used as standard, which covers a wide range of applications. For handling particularly aggressive liquids at high temperatures, the device can be made entirely of PVDF. The standard filter has EPDM seals.
| Material | Abbreviation | Tmin [°C] | Tmax [°C] |
| Polypropylene | PP | 0 | 80 |
| Polyvinylidene fluoride | PVDF | -30 | 120 |
| EPDM | E | -40 | 150 |
| Viton | V | -25 | 220 |
| Polytetrafluoroethylene | T | -190 | 260 |
| Flange DIN2501 PN10 | F |
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Dry run protection/pressure sensor
Low and high pressure safety valves protect the installation against excessive pressure build-up. They can also be connected in such a way as to generate an audible and visual alarm when low or high pressure occurs. The device is ideal for protecting pumping equipment that can be damaged by cavitation, dry running or increased pressure. The device containing the diaphragm pressure sensor is installed on the discharge pipe, which is attached to the pump by means of a tee with a threaded fitting.
|
The device must be connected to an electromagnetic relay, which can be built-in or connected to a junction box, which controls the power supply to the pump motor. It can be used with any single or three-phase motor. Installation of a tee for mounting the switching unit in the pipeline can be supplied in all sizes for both metallic and plastic materials.
Cavitation and dry running
If cavitation occurs or the pump runs dry, the outlet pressure will drop; this process activates the pressure sensor and, by means of an electromagnetic relay, switches off the power supply to the pump. An adjustment screw available under the cover on the block head allows the pressure sensor to operate at a specific pressure drop. The minimum outlet pressure should be 0.2 bar. The pressure sensor is designed to work with clean, non-crystallizing liquids.
For liquids containing solid particles or crystallizing liquids, an intermediate chamber containing a diaphragm can be used, through which the pressure change in the line is transmitted to the signal device. The advantage of the intermediate chamber is that it has large open surface area limits for liquid flow, thus significantly reducing the likelihood of clogging.
