Pulp & Paper
Pumping Solutions for the Pulp & Paper Industry
Pulp and Paper operations require pumps in a wide spectrum of usage. The pumps are used at the front end of the plant through the waste treatment. D.L. Thurrott, Inc. offers pumps for each area of the operation.
The Summit 2196 series ANSI pumps meet the B73.1 specifications. These pumps are engineered for flexibility and durability with capacities from 4 to 4000 gallons/ minute. They have extra-heavy investment and no-bake castings CNC machined to guarantee consistency and consistent reliable performance. Open impeller design to handle solids, corrosive and abrasive. The Griswold ANSI pump offers sealing flexibility depending on the application and the customer's standard requirements. These pumps are supplied as bare pump or as complete units mounted on a base with motor, spacer coupling and OSHA guard.
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Sump pumps are used to return water from or send it to the treatment facility and are used through out the plant. These pumps can be simple, portable 110 volt units with float that are portable to duplex systems with pumps, rails, panels and floats.
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Boiler feed pumps are at the heart of most power plants, and economical plant operation depends on reliable pump operation.
When upgrades are properly performed, an upgraded pump may well be "better than new". Returning condensate preserves the treated water and any heat that remains in the fluid. Multi-stage pumps allow for smaller packages with sufficient head pressure to return it to the boiler room. Also located in the boiler room are gear and screw pumps used to feed #4 & #6 fuel oil to the burner.
Boiler Feed Multi-Stage Centrifugal
Multistage design brings the liquid into the eye of the impeller. Each stage feeds the next stage. Higher performance is achieved by multiple impellers each of which generates pressures many times greater than standard centrifugal pumps running at the same speed. These pumps have replaced the inefficient turbine pumps found in many boiler rooms.
The goal for condensate return is to get it back to the boiler as quickly as possible preserving the remaining heat and reduce the need to add new water to the system. Returning condensate that has already been treated when it was added to the boiler reduces the need for additional chemicals. These pumps can be mounted on the side, through the top or close to the receiver.
Viscous shear sensitive products, used in paper coating, require pumps that are gentle yet can handle the higher viscosity and abrasive nature of these liquids. The progressive cavity pump has been the pump of choice. With improvements in the rubber materials, the peristaltic (hose) pump is used in these applications as well.
Chemical feed pumps are used where proper concentration of chemicals is critical to the finished product. Where process controlled addition of chemicals is necessary in the boiler room to treat make up water, waste stream neutralization, or where the addition of bleaching agents is indicated. Chemical dosing can be controlled with stroke length and frequency through standard metering pumps or with a 4 -20 mA signal tied into the pump.
Air Operated Diaphragm
Air operated diaphragm pumps can be use in many areas. The pumps ability to run dry coupled with self-priming make it useful as a portable pump or one in a tough environment.