Ammonia

Positive displacement pumps are ideal for transferring ammonia due to their precise flow control and ability to handle the fluid's unique properties. Ammonia is a volatile and corrosive substance, requiring careful handling to ensure safety and efficiency in industrial applications. Positive displacement pumps, such as gear pumps, provide a constant flow regardless of pressure variations, which is crucial for maintaining stability and efficiency in ammonia transfer processes. Their robust design allows for reliable operation even when dealing with the abrasive and corrosive nature of ammonia. Moreover, these pumps can handle the low vapor pressure and high volatility of ammonia, minimizing the risk of leaks and ensuring safe transportation within industrial settings. Overall, the reliability, precision, and safety features of positive displacement pumps make them the preferred choice for handling ammonia transfers.

Viking in the Process

In vapor compression ammonia refrigeration systems, liquid ammonia in the evaporator coils absorbs heat, and some flashes to a gas before recompression. Viking pumps “overfeed” the evaporator to ensure that the ammonia in the evaporator coils is liquid, which is more efficient at removing heat than a gas. Viking 4924A Series™ draw liquid ammonia from an accumulator vessel and pump it to the evaporator and back in a closed loop. Liquid and gaseous ammonia are separated in the accumulator and the gas is recompressed and flows to the condenser where it rejects heat, then to a receiver and back to the accumulator in a closed loop. The Viking pumps’ slow speeds enable very low NPSHr to prevent flashing and cavitation. Their high efficiency, with air-cooled motor, add almost no heat to the system, increasing overall cooling efficiency.