Patent ID: 9744477
Date: 2017-08-29
CPC Classifications: B01D,G01N,Y10T

Claim:
1. A method for purging a fluid channel in a low pressure gradient formation liquid flow system, the method comprising: in a flow system having a cross connection, a first valve in communication with the cross connection through a first fluid channel, a second valve in communication with the cross connection through a second fluid channel, and a pump system in communication with the cross connection through a third fluid channel, the first fluid channel having a volume containing a first liquid and the second fluid channel having a volume containing a second liquid, drawing the first liquid from the first valve through the first fluid channel, the cross connection, the third fluid channel, and the pump system; closing the first valve to prevent flow between the cross connection and the first valve; opening the second valve to permit flow between the cross connection and the second valve; supplying the first liquid from the pump system through the third fluid channel, the cross connection, and the second fluid channel to at least the second valve to thereby replace the volume of the second liquid in the second fluid channel with the first liquid; and closing the second valve to thereby prevent flow between the second valve and the cross connection.