Practical Pumping in Firefighting. Pressure, flow and throw?
Hi, first question ever on reddit here but this is something that has troubled me for years that I can’t seem to find the answer to.
Context - I’m a firefighter in Australia and part of our training is operating pumps where we get a basic knowledge of hydraulics and various principles. While I feel I have a decent understanding, as someone who has always been scientifically oriented - I want to understand it more.
I’ve watched the linked video 3 times trying to apply it to the context we use but I can quite seem to wrap my head around it. I have many questions however I’ll try to just start with one, please bear with me.
I understand by restricting the opening at the end of a pipe/hose (eg with a thumb or nozzle) we increase the pressure inside it, which results in a stronger stream/throw - but at the expense of volume/flow.
My question: If we increase the speed of the pump/throttle at the other end of the pipe/hose - what effect does this have on the pressure and flow at the nozzle? Is there a maximum flow a certain opening can facilitate or will the increased pressure in the pipe/hose just increase the velocity of the water travelling through this opening?
Sorry if this seems super simple, I definitely have a bit of imposter syndrome posting in here but any explanation would be amazing. Also apologies in advance for any follow up questions.
Kind regards, one curious firey :)