 HYDRAULIC POWER UNIT - HPU
The HPU is a patented technology developed to increase the efficiency and improve the economics of dispensing high-pressure gas. The gas is first compressed using reciprocating
compressors into certified storage vessels that have been modified to operate with the HPU “liquid push” technology. These compression stations are often referred to as
“mother stations”.
Once the CNG has been delivered to the dispensing site or “daughter station”, specially formulated fluids are pumped directly into the gas transport vessels. This fluid displaces
the high-pressure gas as it moves through the gas dispensing system and into a vehicle storage vessel or other high-pressure storage vessel. This method allows for a minimal
loss of the energy used to compress the gas. The NEOgas HPU technology maintains the gas pressure throughout the system rather than allowing the pressure to first drop and
then be recompressed. No fluids are allowed to pass through with the compressed natural gas
Efficiencies and cost savings are realized in the following ways:
- 95% of the gas transported can be dispensed. This compares to an average of 70% of the gas being dispensed in booster compressor systems.
- Less energy is used to maintain the gas pressure than to allow the pressure to drop and then have to recompress the gas. The closest competitor tested uses
21% more energy than NEOgas does.
- The maximum flow rate for the NEOgas L-1000 Nm3/hour HPU system is 1000 Nm3/hour. The 2000 Nm3/hour HPU now available is rated to dispense up to 2000
Nm3/hour. Under actual operating conditions (two dispensers with two hoses each), the L-1000 HPU consistently tested at a refueling rate of 722 Nm3/hour. This
hourly rate includes the time needed to connect and disconnect the vehicles as well as when vehicles were not filling. Reciprocating and booster compressor
systems that compete with NEOgas have been tested up to a maximum flow rate of only 579 Nm3/hour.
For
more information, also see: |
