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公开(公告)号：US20190203448A1
公开(公告)日：2019-07-04
申请号：US15972128
申请日：2018-05-05
Applicant: Jin Fu Xiang
Inventor： Jin Fu Xiang
Abstract: An autonomous fresh water storage and supply system for a local community, able to meet the water demand for all kinds of situations even under an emergency circumstance and always able to have a five-day fresh domestic water demand storage in its reservoir. It also has multiple pressure zone water distribution capability. In addition, the water pressure of system can be adjusted to the different setpoints by changing VFD pump output pressure. The electrical power of the water station has both regular power supply from the utility line and backup power from a diesel engine generator. All control instrument devices should be connected to an All in One PC terminal and Human Machine Interface (HMI). All water qualities should be frequently monitored and tested to meet the local water code requirements.
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公开(公告)号：US10982416B2
公开(公告)日：2021-04-20
申请号：US15972128
申请日：2018-05-05
Applicant: Jin Fu Xiang
Inventor： Jin Fu Xiang
Abstract: A method to distribute water from a private water tank to a user site includes connecting the private water tank to three parallel low pressure Variable Frequency Drive (VFD) pumps, two parallel high pressure VFD pumps, a pressure reducing valve (PRV), a tank level control valve, a flow meter, two pressure gauges, and two pressure transducers; controlling the three parallel low and two high pressure VFD pumps using a PLC programmed with at least first, second, and third low pressure pump set operation curves (LPPSOCs) each specifying a low pressure pump operation set point (B) and a PRV operation set point (F) at each of first, second, and third flow rates and first and second high pressure pump set operation curves (HPPSOCs) each specifying a high pressure pump operation set point (G) and a high pressure pump energizing set point (E) at each of fourth and fifth flow rates.
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