Pulsation is another problem that is typical with most metering pumps and in some cases cannot be tolerated by the application. Pulsation dampeners are available in a variety of sizes and materials for such situations and help remove a high degree of pulsing and surging in the line. They only work if installed properly, in the right order in the line and with the right pressure. A bottle type pulsation damper may be required in some installations where the suction piping is long or has many bends; this is because metering pumps ‘push’ against pressures. The damper will reduce the effects of acceleration pressure losses, thus assisting the pump to perform correctly. Dampeners on the suction side of the pump take care to feed the pump & limiting the risk of cavitations.