Upgrading to an even safer pump solution
Sealless magnetic drive pumps offer complete containment and eliminate the need for dynamic seals. The containment shell forms part of the primary pressure boundary, and its breach is an extremely rare occurrence. To further enhance safety when pumping hazardous liquids, HMD Kontro sealless pumps can be fitted with secondary protection as an upgrade to restrict or contain any leakage.
There are two methods of secondary protection:
The containment shell is located inside the coupling housing which may, as an option, be fully sealed to form a secondary pressure boundary with a secondary containment system. The system comprises a dry-running gas seal at the rear of the coupling housing along with a leak detection device (either Pressure or Liquid Sensor) in the secondary area. If the primary pressure boundary fails, the pump is shutdown, and the process liquid is contained.
As a variation on the above containment option, secondary control features a sealing device at the rear of the coupling housing that restricts leakage, along with leak detection instrumentation (either Pressure or Liquid Sensor) within the secondary area. In the unlikely event of a breach of primary containment, liquid release is restricted, and the system allows for the removal of the process liquid via the secondary housing vent or drain connections.
HMD Kontro has a wide range of aftersales literature to help you with your HMD Kontro products. If you would like further information about secondary control and containment please take a look at our Secondary Control Containment leaflet or send an email to firstname.lastname@example.org.
As is the case for both sealed and sealless pumps, the main causes of magnetic drive pump failures are process-related. Most are caused by inadequate lubrication of the pump internal bearings and overheating as a result of process-related upset conditions, such as:
- Closed suction or discharge valve (dead-heading)
- Dry running or low flow
- Cavitation or vapour in the pump
- High flow overload
To protect and extend the life of a sealless pump, various instrumentation is options are available to monitor power, temperature and liquid conditions. Those available from HMD Kontro, as examples, include VapourView, a revolutionary gas in liquid detector, and power control monitors and temperature sensors.
Please see the Monitoring & Measuring page for info on the numbers identified in the graphic.
VapourView, which is an innovative non-intrusive instrument, monitors the amount of vapour present in the pumped liquid, providing an early warning of adverse conditions that could lead to pump failure.
Power Control Monitors measure absorbed power and trip the pump if the power falls outside of the set limits, protecting against a range of upset conditions including no / low or high flow.
Temperature sensors are also available, to measure the temperature at the containment shell providing an early indication of process or mechanical problems.
The installation of one or more of the above instrumentation options will help prevent the vast majority of magnetic drive pump failures. You can find out more about the instrumentation that is available on our Sealless Smart page.
Pump shutdowns can be costly, not only in repair costs but also from loss of product and revenue. Power Monitoring is one of the best ways to protect your pump from not only shutdown, but also system upset damage and equipment failure.
What Is A Power Control Monitor?
The PCM is a device that senses true power input and so almost all pumping conditions that typically damage pumps can be detected quickly and ultimately avoided. It is installed in line with the motor driver of a pump or other rotating equipment.
What Does A Power Monitor Detect?
- High Flow / End-of-Curve
- Low Flow / Back-of-Curve
- Jammed Impeller
- Increased Viscosity / Precipitation
- Severe Cavitation
- Deadhead / Closed Discharged Valve
- Decoupling (Magnetic Drive Pumps)
Advantages & Benefits of Power Monitoring
Power Monitoring has clear advantages over current or amperage monitoring since the input power varies linearly across the entire motor load range unlike current monitoring where the current is almost constant up to 50% of the motor load range, which makes it very difficult to detect changes below 50%.
The Power Control Monitor is therefore, an extremely reliable and accurate detector of system changes and as such most pumping condition changes will be seen in input power fluctuations. The benefits include:
- Virtually eliminates pump damage due to system upsets
- Significantly reduces spare parts costs
- Reduces downtime
- Reduces service costs
- Eliminates extra component and installation costs
- Isolates dangerous high voltage exposure for workers
- Provides feedback for troubleshooting operational problems
A Power Control Monitor will certainly protect your rotating equipment investment, minimising costly pump shutdowns and reducing your operating costs. For more information, please call us on +44 (0)1323 452154 or email;
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