Metal Finishing Guide Book


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some provision must be made to protect against unforeseeable events that could cause severe losses. This includes some form of barrier or removable strainer to prevent the suction of parts into the pump. The addition of a pressure gauge is strongly recommended to determine the initial pressure required to force the solution through the filter and also to determine when the filter media needs to be replaced. When starting up a new filter system, or after servicing an existing system, it is advisable to completely close the valve on the downstream side of the filter; in this way, the pump will develop its maximum pressure, and one can immediately determine whether the system is secure. Sometimes filtration systems are tested on a cold solution and, in turn, will leak on a hot solution and vice versa. Therefore, a further tightening of cover bolts, flange bolts, and so on may be necessary after the filter has been operating at production temperature and pressure. If pump curves are not available, one may wish to check the flow at different pressure readings to determine a reasonable time for servicing the equipment before the flow rate has dropped too low to accomplish good dirt removal. 646

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