Abnormal Operation – Dry Running
During many years IWAKI has focused on avoiding the impact of “abnormal operating conditions”, and have thus developed and patented several good solutions.
“Abnormal operating conditions” can damage a pump and among others lead to expensive downtime.
Friction Heat avoided with IWAKI’s “Non Contact System”
Dry running means that a pump is running without any liquid, which can be extremely damaging to all centrifugal pumps – both pumps with shaft seals and magnetic drive pumps.
Under normal operating conditions the liquid circulates in the centrifugal pump and ensures to cool and lubricate the pump. Without liquid friction heat will normally be generated, which can cause the pump to overheat and cause damage to the impeller, bearings and shaft.
To address this, there are a number of solutions, where some of the most common are monitoring systems that trigger an alarm when dry running occurs.
With IWAKIs patented “Non Contact System” frictional heat is avoided completely, since the inner and outer magnet is designed so that the inner magnet “is held in position” even during dry running. Thus, there is no contact between the magnet and the back part and the frictional heat is avoided.
IWAKI’s “Non Contact System” is implementered in amongst others the MXM and MDM pumps with carbon fiber bearings and shaft. Carbon fiber has a high self-lubricating capability and shows excellent low friction characteristics even under dry environments.
The pump can withstand dry running for a longer period, in some cases up to a couple of hours with no damage of any kind. Watch this video on Youtube, where the MDM32 pump from IWAKI is tested.
IWAKI recommends that you remain aware of “abnormal operating conditions” and take due precautions.