Winston Engineering Case Study

Case Study 7 WILDEN PUMP MUFFLER ICING Why does icing occurs on muffler during pump operation? Mufflers are included and recommended to be installed on AODD pumps because they can generate high decibel levels at full speed.  AODDP are driven by Compressed air.  When the compressed air enters the centre block, it  is channelled through the pump air valve and exhaust through the muffler. During this process, rapid temperature change occurs. Air temperature is well below freezing at the muffler exhaust and this causes icing-related issues.  This is more common in high humidity environments. How to prevent? Symptoms that shows pump is having icing related issues are as follows Pump is operating erratically Visible sign of ice formation on the muffler Possible cause for icing is - the inlet air has high levels of moisture  Remedy Try the below solutions to eliminate icing related issues and restore your pumps efficiency. ...

Case Study 6 What is a VFD? A Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed drive, adjustable speed drive, adjustable frequency drive, AC drive, microdrive, and inverter. How does a Variable Frequency Drive work? The first stage of a Variable Frequency AC Drive, or VFD, is the Converter.  The converter is comprised of six diodes, which are similar to check valves used in plumbing systems.  They allow current to flow in only one direction; the direction shown by the arrow in the diode symbol. For example, whenever A-phase voltage (voltage is similar to pressure in plumbing systems) is more positive than B or C phase voltages, then that diode will open and allow current to flow. When B-phase becomes more positive than A-phase, then the B-phase diode will open and the A-phase diode will close. The s...