往復ポンプ吸入配管系における異常振動現象

抄録

Abnormal unsteady vibrations, apparently different from normal vibrations of the piping system around reciprocating pumps, have been experienced in the suction piping system of a reciprocating pump at a petrochemical plant. Results of measurements of the piping vibrations and pressure pulsations show that (1) the abnormal vibrations are caused by the unsteady pressure pulsations; (2) the unsteady pressure pulsations are classified into two typical types; and (3) the unsteady pressure pulsations are deeply related to the existence of vapor or gases in the piping system. Installation of a volume bottle with precharged nitrogen gas is effective in preventing the abnormal vibrations.