Fire Engine Heat Exchanger (Pump Series - Part 12)
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- čas přidán 2. 08. 2020
- Today we're looking at the Heat Exchanger. This has to be one of those components that 99% of rookies misunderstand. After you've given today's training video a watch, I encourage you to tilt the cab on your apparatus, grab one of the "old heads" and look for that circular-shaped part with two lines (one in, one out) on your engine - then have them explain how this is used to cool your diesel engine.
I hope this and all the videos here are helping generate conversations at your Fire Station! There is a wealth of information sitting around your kitchen table every shift - are you tapping into it?
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![Fire Engine Tank [re]Fill (Pump Series - Part 11)](http://i.ytimg.com/vi/RysD2fN2G4c/mqdefault.jpg)
Everything said is 100% true, I can only add one thing. To tell folks to keep the Heat Exchanger OFF (especially on the wildland engines with smaller tanks) if you are only pulling water from tank and are NOT connected to a hydrant or cold river, lake etc. Because you are Transferring that HOT coolant temperatures of the apparatus engine and placing that heat into your apparatus tank water! The key word is "Exchange" here. BTU generated vs BTU absorption right? The purpose behind the heat EXCHANGEr is to TRANSFER HEAT FROM A HIGH TEMP SOURCE TO A LOW TEMP SOURCE. nothing more.
Those lines on the heat exchanger are connected from the apparatus engine radiator, running to a heat exchanger tube mounted usually on the 4" or 6" intake PiPE(pos inlet pressure entry). So from the radiator, a discharge line runs into one end of the exchanger and out the other end back to the radiator as an isolated system. Then one end on the side, a line from the pump discharge is connected, then on the other end of that exchanger and also on the side, is the line that pulls that heated water from the suction side and that is intended to draw cold or cool water from intake, through the pump, pump it into the heat changer, and DRAW that apparatus engine heat away and carry it into the pump intake and then back out mixed with other cold water. If on the other hand you have no draft lines or hydrant lines connected, in a matter of hours you'll heat your tank water to the same temperature (or nearly) as your apparatus engine temp. So what's the point there then right?
Municipal Apparatus that are usually always connected to a hydrant should probably never have to worry about it.
depending on the apparatus and its capacity in both pump and tank and exchanger, you could be recirculated hot water. what effect will this create on your impeller do you think??? !!!
Excellent Vid!!
Spin the nozzle onto the front discharge and set it to wide fog into the radiator
Love the channel! Learned, and continue to learn, so much
Good stuff man!
Appreciate it!
Isn’t it true that you want to leave the heat exchanger off until it’s needed? I see a lot of people who leave it on all of the time because it’s hot out however when we took delivery of a new pierce some years back the guy going over it told us never to turn it on unless you started to over heat, if it’s left on it would be useless when the time comes. Just curious what others thought or knew about this.
Also, keep it up man. This channel is awesome!
I’d be lying if I had been instructed one way or another. I never left it on. Would engage it if we had prolonged operations in higher temps. I also used other methods prior to this though… cooling the ground below the engine and even using a low flow wide fog 6-8’ in front of the engine.
This is how I see it. If you have the heat exchanger on and your truck overheats, you have nothing to quickly cool the engine off. So you'll be doing step 2 of step 3 of Roll Steady suggestions that be cool th floor underneath or the front of the engine. But if you have the heat exchanger off and your engine starts to overheat. You can start the process to cool the engine off by turning a valve. In turn, it will buy you some time to pull a line cool the floor or cool the radiator down.
Is the difference between the tank fill/heat exchange the same as tank fill/pump cooler?
Alongside its regular use, the Tank Refill is used to keep the pump cool by recirculating water via the tank.
Heat Exchanger is used to assist in cooling the Engine’s Motor.
I've never see something labeled a "pump cooler," but my experience is limited to Dallas and a few smaller suburbs in our metroplex. The name would imply it is doing the same thing as recirculating via the tank refill.
@@TheRollSteady yes sir I agree. I have always known the tank fill to recirculate the tank water to keep it cool besides it's obvious purpose of refilling the tank but the pump cooler I have always perceived it to be basically the same thing except it cools the pump by "peeing" water out through underneath the apparatus. I don't have any experience with the heat exchanger, but overflowing over the top and into the engine is something I never considering.
I’m guessing 3 is to lift the cab
No, this wouldn't be possible while pumping.
It’s possible for our trucks...