Chlorine metering in paper mills
In separate pumping applications reported from paper mills in Oregon, USA, Hydra-Cell M-03 pumps replaced conventional metering pumps in systems handling chlorine. The Hydra-Cell's low pulsation delivery, with multiple diaphragms combined in a single head, was a significant factor in both installations.
At one mill, a newsprint plant, there were problems injecting chlorine into the incoming raw water supply. Excessive pulsation from the original pump was causing a PVC pipe to fracture and leak. The Hydra-Cell pump, coupled to a 56C frame DC motor and manually adjusted SCR controller, gives a much smoother output flow. Chlorine bleach or sodium hypochlorite has a tendency to out-gas especially at the inlet of the pump so the customer made a further system improvement, installing a T with a vertical stand pipe that reaches as high as the level of fluid in the reservoir. This installation provides an outlet for collected gas before it reaches the pump and has helped reduce the possibility of cavitation. Pump speed is easily adjusted to proportion chlorine volume in response to water quality tests - initially a manual system but scheduled for full automation.
Metering pumps supplied with the chemical have not always performed well when exposed to the demanding environment of the paper industry. Management at an Oregon mill manufacturing fine papers was not content with the performance of the pump supplied to meter chlorine biocide in the white water loop - an essential operation to prevent the incubation of slime-forming bacteria in the pulp. The mill looked for a ruggedly built alternative to the original pump, whose thermoplastic housing and single acting solenoid-driven diaphragm (delivering a significant pulse) were judged inadequate. The Hydra-Cell M-03 pump which replaced it has performed smoothly, and with no reliability issues, in this location.
Model: M-O3