Forgive me if I’m wrong, but since they’re using hose and not pumping up a standpipe, isn’t the pressure loss per hydraulic length more than the pressure loss due to elevation?
Assuming they’re using a smaller diameter hose, considering the drone has to lift the hose plus the water in it.
Sorry, I’m new to pumping and any explanation would be appreciated!
When calculating operating pressures, you must account for friction loss, elevation loss, and—if applicable—the nozzle operating pressure. Friction loss will vary depending on the diameter of the hose being used. As a general guideline, elevation loss is approximately 5 psi per floor when dealing with vertical applications.
Based on current observations, most drones are not discharging plain water but rather a water/solution mixture (foam). The use of foam significantly reduces the overall load on the drone by making the hose lighter and easier to manage. This reduction in weight may also decrease the pressure required to effectively operate these devices.
157
u/blackmamba329 13d ago
I wonder what the friction loss is on that