Heat exchangers are a vital part of your heating requirements and at D&H Equipment we design and manufacture our own line of heat exchangers.
Heating viscous fluids such as asphalt and bitumen often require a custom design to accurately transfer product for polymer blending and at the load rack.
D&H Equipment manufactures shell and tube design heat exchangers that conforms to ASTM standards and depending on size, offers single pass shell and multiple pass tube.
D&H heat exchangers come standard with an automated temperate regulating system to prevent excessive heating of asphalt within the heat exchanger and avoid coking against the oil tubes. The supply-side of the hot oil includes a high-temperate, full-modulating electric divert valve tied to an electric controller.
The controller communicates with the modulating valve to regulate asphalt output temperature of the heat exchanger.
The desired asphalt temperature is managed by using the valve to control the flow rate of hot oil (and therefore heating capacity) through the exchanger.
A safety relay monitors the asphalt temperature as well as a pump stop relay and if the asphalt pump stops (either advertently or inadvertently), the controller will automatically close the divert valve.