It just lays there, at least with only hydrant pressure. Somebody disconnected a section it without checking to see if the hydrant was shut down. The weight of 5 sections of hose and water kept it stationary. I haven't been in a situation yet where we used an engine to pressure LDH.
The reason I asked was we were doing hydrant connections and hose line advancement in a class for essentials and I was running the pump for the class.
The piston intake valve we were using did not have the locks and neither did the hose. So when it was charged the water cause the hose to spin and the couplers did not swivel and the hose turned enough that it came unhooked. Before any one says I did not have it connected right I always check my connections on the pump before I call for the hydrant to be charged.
Not knowing what the hose would do I jumped on it to try to pin it to the ground and several others jumped on me until it was shut down.
we did when we weree training on how to hook up the hose to a hydrant and a pumper an all it did was just set there the guy standing in front of it when it happend got soaked an a busted leg thankfuly that it wasnt all that bad