NEVER THROTTLED FULL

This would make #12 seem inappropriate and incorrect. If it is wrong tell that to Coors, Cosmair and Merck to name just a few. Some of the liquid intermediates and finished drugs that are used were made with this piping arrangement. The beer and liquors we drink were made with this type of piping. If this is not enough proof that it works then thousands, if not millions, of people have been doing it 'wrong' for at least 130 years or more. This arrangement of pump, by-pass piping and by-pass control valve has been used in the chemical, cosmetic, pharmaceutical, food, beverages, and fluid handling industries since the 19th century. #9 was verified with 'Perry's Chemical Engineering Handbook', the bible of chemical engineering since it was first published in 1924. I did because the answer is spectacularly correct! What is your reason for #9 being incorrect? Instead of making a statement with no substantiation, a reason should have been given.

This bypass is the same way that a maximum pressure by-pass valve works to control the maximum pressure of the pump on gear pumps and other styles. The best way to regulate the centrifugal pump is to use the by-pass valve of a variable frequency drive with an adequate drive control and pressure sensors. Also, why use a larger pump with a reduced size impeller when a smaller and cheaper pump will do the job. Once this is done there is no way to get more liquid/pressure through it if needed in the future.

NEVER THROTTLED FULL

Full load current will only be drawn when the by-pass valve is completely closed.ĭo not reduce the diameter of the impeller. This set up is also used on many other type pumps. With the by-pass valve is closed the pump and motor will usually make slightly more noise and draw more current. Throttling the discharge puts more load on the motor and pump when less pressure/flow is needed. For less pressure/flow the valve is opened more. When more flow or pressure is needed the by-pass valve is closed more. This always the pump to run at full speed but with less load when it has a reduced load. Standard practice in chemical plants is to run a valved loop from the outlet back to the inlet of centrifugal pump. ' Re: Centrifugal Pump Running with Throttled Discharge Valve ' by

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Never throttled