Method for cleaning a source liquid feed conduit

摘要

Method for cleaning a source liquid feed conduit comprising cleaning a target section of a feed conduit (16) that connects a source tank (22) to a prescribed facility for the purpose of feeding a source liquid to said facility, said method being provided with
a preparatory process,
a residual liquid discharge process, which is carried out after the preparatory process and in which source liquid remaining in the target section is discharged to the source tank (22) or waste tank (62);
a cleaning process, which is carried out after the residual liquid discharge process and which comprises repetition of a feed operation in which cleaning fluid is fed into the target section with the waste valve closed and a discharge operation in which with the waste valve open the leaning fluid is discharged into the waste tank (62) while feeding purge gas; and
a gas purge process, which is carried out after the cleaning process and in which the interior of the target section is subjected to a gas purge by the purge gas.