What is the difference between dual pumping and tandem pumping?

• A. In tandem pumping the pumpers are placed closely together
• B. In tandem pumping the pumpers are placed far apart
• C. In dual pumping the pumpers are placed closely together
• D. In dual pumping the pumpers are placed far apart

Answer: (C)

Dual pumping means two pumpers work in parallel from the same water source to increase the volume delivered through a common line. To keep the system efficient and connections simple, the pumpers are placed close to each other, with short, direct hose connections between their suction and discharge lines. Tandem pumping, on the other hand, uses the pumps in series along the water path to raise pressure, which typically requires more distance between the units to maintain the flow from the first pump into the second. So the best description of dual pumping is that the pumpers are placed closely together.