Frequently Asked Questions
My metering pump has an internal pressure relief valve, will this protect my system during an over pressure situation?
A system should never rely solely on the internal pressure relief valve for total system pressure protection. In most cases the pump can create discharge pressures higher than typical system components can withstand. A system pressure relief valve should be used to protect the system as a whole and set as such.
Is motor rotation critical with metering pumps?
When motor rotation is critical the metering pump will be labeled stating the required motor direction. If this warning is not adhered to, severe damage will result. The product O&M will address this topic in the Set-Up and Start-Up sections.
What spare parts should I stock for my metering pump?
At a minimum a spare pump diaphragm and check valve components should be on the shelf. If the metering pump is vital to the daily operations, a complete spare pump should be considered. Consult with your salesman or JESCO for the appropriate spare parts kit for your respective pump model. In some cases the spare parts kit ID number is located on the pump nametag.
How often should I replace my pump diaphragm?
The pump diaphragm should be inspected and or replaced yearly. Systems that meter abrasive process fluids may need diaphragm replacements on a shorter time interval.
Will my chemical feed system benefit from the installation of a pulsation dampener?
All systems using reciprocating pumps will benefit from the installation of a pulsation dampener. Realistic benefits could be longer diaphragm life, quieter system operation, smaller line sizes and less down time from damaged system components due to hydraulic water hammer.
What is the benefit of an inline pulsation dampener over the traditional style?
The inline pulsation dampener is more effective because 100% of each pump stroke passes through the dampener. The inline design makes more efficient use of space where area is limited.
How long should my pump suction line be?
As a metering pump manufacturer we like to see suction lines no longer than 10¹ and a pipe size larger than the suction connection of the metering pump.
What can be done if a long suction line cannot be avoided?
In systems with longer suction lines, a pulsation dampener can be installed on the suction header, adjacent to the metering pump connection. The dampener will benefit the metering pump by acting as a day tank.
Where in my system should I install the Autovent degassing device?
The Autovent degassing device must be installed directly on the discharge check valve of the metering pump. This location provides the best possible venting for collected gasses.
Does my metering pump need a back pressure valve?
All metering pumps require some amount of positive system pressure or back pressure to assure accurate metering. A back pressure valve is the single most common accessory to create this positive pressure.
Will a back pressure valve prevent siphoning?
By design a back pressure valve will prevent siphoning. It is not recommended to use a back pressure valve in such a fashion because they are not ³fail safe². If siphoning is a concern a siphon breaker should be installed in your system.
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