Replies to This Discussion

Permalink Reply by ee779 on December 3, 2007 at 11:24pm

Yes, going from a larger diameter hose to a smaller on will increase pressure. and decrease friction loss with longer runs. However, I don't recall ever using a gated "y" in a low water enviroment.

Permalink Reply by Don Smith on December 7, 2007 at 3:28am

Actually I was talking about one connection with a reducer between the different diameters. Either way I should wait until I get back and figure out what the flow rates are.

Is there a reference for determining something like this?

Permalink Reply by Rick on August 19, 2008 at 5:38pm

In my dept when we brake down from a 21/2 to 1 1/2 we always use a gated wye in case you want to shut down one line, great in low water cases. For the ref you're looking for look in pumping apparatus driver/operator handbook. What rates are you looking for? A 1 1/2 will flow 125 gpm 1 3/4 175 gpm 2" 200 gpm and a 2 1/2 25o gpm. Hope this helps.

Permalink Reply by Becki Turner on October 4, 2008 at 1:10am

If you are talking about the flow rates of the hydrants in your area, there is a tool for determining that. I cannot remember what it is called, but it is a guage of some kind. How do I know? My husband had to do the hydrant flow pressure test in his FireFighter 1 or 2 IFSAC Skills test. He'd never seen the tool till then! Fortunately for him, he's a brainiac and figured it out on the spot, because he had briefly read over the skill sheet before going to the testing site that day!

Permalink Reply by Rick on December 6, 2008 at 12:48am

If you ask your public works dept they should be able to tell you what the flows are.

Permalink Reply by Chief 29 on December 24, 2008 at 11:38am

It's called a pitot tube and if you don't like to get wet you would use a device called a diffuser.