Method and apparatus for verifying a leak in connection with a flow inhibitor
AssigneeABB AB
InventorJuha Saukko
Life of this patent
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Abstract
Exemplary embodiments relate to a method for verifying a leak situation in a liquid transfer system a system and a control unit for implementing the method. The liquid is transferred with a frequency-converter-controlled pump from a lower pressure to a higher pressure and where liquid is prevented from being transferred from a higher pressure to a lower pressure with one or more check valves positioned in a pipe system. The method includes generating, for the frequency converter, motion information on the motion of the pump between the motion operations, and indicating a leak situation of the check valve if the direction of operation of the pump is, in the motion information, opposite to the direction of operation during the use of the pump.
Claims8
A method for verifying a leak situation in a liquid transfer system where liquid is transferred with a frequency-converter-controlled pump from a lower pressure to a higher pressure and where liquid is prevented from being transferred from a higher pressure to a lower pressure with one or more check valves positioned in a pipe system, the method comprising the steps of:
- a) generating for the frequency converter motion information on the motion of the pump between the pumping operations;
- (b) indicating a leak situation of the check valve if the direction of operation of the pump is, in the motion information, opposite to the direction of operation during the use of the pump.
A liquid transfer system, comprising
- a pump arranged to transfer liquid from a lower pressure to a higher pressure;
- a frequency converter arranged to control the pump;
- one or more check valves positioned in a pipe system and arranged to prevent liquid from being transferred from a higher pressure to a lower pressure;
- identifying means arranged to generate for the frequency converter motion information on the motion of the pump between the pumping operations of the pump;
- and
- a control unit of the frequency converter, having comparison means arranged to generate alarm information to indicate a leak situation of the check valve if the direction of operation of the pump is, in the motion information, opposite to the direction of operation during the use of the pump.
A control unit of a frequency converter, comprising software means arranged to:
- receive motion information on a frequency-converter-controlled pump between the pumping operations, the pump being arranged to transfer liquid in a pipe system comprising one or more check valves;
- and
- indicate a leak situation of the check valve if the direction of operation of the pump is, in the received motion information, opposite to the direction of operation during the use of the pump.
Dependencies are inferred from the claim text.