Pressure?

[alpha4]

hey all, i am currently taking hydraulics class, and am curious to how much gpm/psi is coming through the nozzle when it is set to flush?
thanks

[ScareCrow57]

hey all, i am currently taking hydraulics class, and am curious to how much gpm/psi is coming through the nozzle when it is set to flush?
thanks

there are 3 gpm at 10 psi

Seriously, you need to give a little more info. Hose size, length of hose, pressure at the pump would be pretty helpful

[snowball]

What size hose, what brand of nozzle?

[alpha4]

Sorry about that,
Let's say a 1 3/4 inch hose, 150 feet,
With a manual adjust fog nozzle,
Not sure of

[ScareCrow57]

I've got a better idea. Why don't you take the class first.

The GPM and PSI will be highly dependent on the GPM and PSI at the pump.

[kuh shise]

Making the following assumptions: (I know - makes an *** out of you and me)
150' of 1 3/4" with original nozzle setting at 200 gpm needs 166 psi of engine pressure. Then holding the EP at that value and allowing for the opening of the nozzle baffle to approximate 1 1/2" opening. The nozzle pressure of 20 psi equates to 300 (301) gpm, and 300 gpm through 150' of 1 3/4" hose has an Fl of 148 psi or still holding 166 psi of EP. So my guess is about 300 gpm on flush with a reach of about 35 feet. Run your problem on an engine with a flow meter and tell me how close I am to the actual.
Kuh Shise

[Capt387]

I've got a better idea. Why don't you take the class first.

The GPM and PSI will be highly dependent on the GPM and PSI at the pump.

did you learn that from the Sears & Roebuck self study guide there Wizard?

[ScareCrow57]

did you learn that from the Sears & Roebuck self study guide there Wizard?

Don't be silly - Its covered in Thermodynamics

[FyredUp]

Another example of a topic where ScareCrow had absolutely nothing of value to add but he still couldn't help himself and he had to post anywys.

When you have nothing to add WHY do you feel the need to post?

[Dickey]

Sorry about that,
Let's say a 1 3/4 inch hose, 150 feet,
With a manual adjust fog nozzle,
Not sure of

Is the nozzle an adjustable nozzle? What brand?

To answer your question, we need to know what kind of nozzle and if it is an adjustable gallonage nozzle. This will make all the difference.

[CaptOldTimer]

Who really cares how much water comes out of the nozzle when you have it on FLUSH!

I hope enough to clean out the nozzle if you need to flush it.

[GTRider245]

I've got a better idea. Why don't you take the class first.

The GPM and PSI will be highly dependent on the GPM and PSI at the pump.

Epic fail.

[FyredUp]

Who really cares how much water comes out of the nozzle when you have it on FLUSH!

I hope enough to clean out the nozzle if you need to flush it.

Because if you maintain the correct nozzle pressure it can actually give you MORE WATER than the normal gpm flow of that nozzle. The pattern is more broken, but is more than adequate for interior room fire scenarios. I always looked at it as extra emergency water if needed. Kind of like that twisty thing on the end of the TFT Dual Farce nozzle.

[FyredUp]

I've got a better idea. Why don't you take the class first.

The GPM and PSI will be highly dependent on the GPM and PSI at the pump.

"Just when I think you have said the stupidest thing ever you just keep posting."

Paraphrased from that man of the people, Hank Hill

[ScareCrow57]

Another example of a topic where ScareCrow had absolutely nothing of value to add but he still couldn't help himself and he had to post anywys.

When you have nothing to add WHY do you feel the need to post?

There is nothing of value to add becuase the question is poorly worded and doesn't even come close to giving enough information. However Mr. know-it-all makes 100 assumptions then gives a meaningless answer.

But hey, here is another one for you. How fast is a fire truck????

[ThNozzleman]

I've got a better idea. Why don't you take the class first.

The GPM and PSI will be highly dependent on the GPM and PSI at the pump.

"Highly dependent," you say? Holy crap, you're smart!

[Rescue101]

Stupid is as stupid does. T,C,

[CaptOldTimer]

Because if you maintain the correct nozzle pressure it can actually give you MORE WATER than the normal gpm flow of that nozzle. The pattern is more broken, but is more than adequate for interior room fire scenarios. I always looked at it as extra emergency water if needed. Kind of like that twisty thing on the end of the TFT Dual Farce nozzle.

The Elkharts that my department uses, has a flush on the nob, but it isn't going to give you an adquate flow to do much. As the lady said anything is better than nothing!

BTW we tried TFT's and got rid of them as no one liked them and stayed with Elkhart.

[FyredUp]

The Elkharts that my department uses, has a flush on the nob, but it isn't going to give you an adquate flow to do much. As the lady said anything is better than nothing!

BTW we tried TFT's and got rid of them as no one liked them and stayed with Elkhart.

By the very nature of the flush setting at equal nozzle pressures it HAS to give you more water. All the flush does is move the baffle out farther.

Of course, since you are enlarging the opening on the nozzle you have to increase the engine pressure to maintain 100 psi at the tip.

[FyredUp]

There is nothing of value to add becuase the question is poorly worded and doesn't even come close to giving enough information. However Mr. know-it-all makes 100 assumptions then gives a meaningless answer.

But hey, here is another one for you. How fast is a fire truck????

Look Super Genius, I have run tests doing this exact thing, and with the nozzle I listed in the other similar topic I got the results listed. n Have you run these tests? have you ever even thought of it? Maybe wikipedia can be your friend again.

See realworld experience can be your reference. The only stickler is you have to have some real world experience to draw from. That surely is your biggest downfall.

It should be as fast as the speed limit and driving conditions allow. Have you ever been in a REAL firetruck?