LPG Pump Motor
Auto gas is the common name for liquefied petroleum gas (LPG) and when it is mixed with air, a highly flammable mixture is produced. The flammability range is between 2 % to 10 % by volume of gas to air. LPG vapour is also heavier than air, therefore any release will migrate to the lowest point where it will concentrate and form a highly flammable
mixture.
Challenges
Pumps are used in gas filling stations to unload the gas into the storage units and
dispensing the gas into the refilling units such as automotive vehicles. During the
process of unloading and dispensing, the
pump motor runs at full speed – 50Hz.
Whilst unloading full speed of pump was
ok, but same not desirable during
dispensing, as small quantity of LPG fills up
to customer’s vehicle tank in no time – may
be a fraction of a second. Thus most of the
time customer’s suspect on quantity filled in
the customer vehicle tank. Also due to
frequent on-off sequence failure of
contactors was high.
Solution
VFD is incorporated to run the pump motor in such a way that during unloading the gas
into the storage unit motor rotates at high speed - frequency 60/75 Hz so that unloading
time is reduced. Similarly, at the time of dispensing, motor rotates at slow speed with
smooth start – acceleration time 15 sec and speed 20 HZ - so that gas filling in to
customer vehicles tank is increased.
Product Supplied
AC Drive : YASKAWA A1000
Power Rating : 5.5kW,400V,3ph
Application : LPG Pump Motor
Benefits
By using YASKAWA Variable Frequency Drives in above controller some important
benefits to for fuel transfer systems:
- Easy, reliable and smooth operation process.
- Reduce peak current hence motor efficiency increases.
- Energy saving, YASKAWA drives utilize only the energy necessary to accomplish the task.
- There is no additional controller or PLC required for the individual control.
