Round and Square Dump Valves on the Same Truck

I have seen quite a few tankers with round dumps on the side and square dumps on the rear. I was wondering why this is being done? Why not put square on the sides also?

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Permalink Reply by united 289..{Dave} on October 22, 2008 at 9:00pm
I can honestly say i have never seen square dump values on the side till now. I have always seen the round dump valves. I am like the rest have not seen a telescope that is round. Our new engine has the telescope square dump.
Permalink Reply by Jenny Holderby on October 22, 2008 at 9:52pm
I just saw that picture that I didn't see earlier. Our tanker is actually a tanker/pumper, it has the same pump as the engine, and the same connections. You can pump the water out of the tank or open the valve to offload water. There is also a 10" quick dump @ the back & intake valves on the other side. One engine is also equipped with a quick dump, as well as an intake & outlet on the back as well as the sides.
I can see that you wouldn't be able to connect a hose to the port in the picture. Personally, I have never seen one of those before. Is there some sort of , what am I trying to say? Half round thing that slides out over the tank like a chute? Probably not because then someone would have to get out of the rig to opperate that.

We did retro fit one of our tankers with a square quick dump. I have seen square dumps on the side as well. Maybe its a geographical thing :) But IS there any difference in the volume of water they discharge? They are smaller but lower on the tank but through a smaller valve, it would take longer to offload 1800 to 2000 gal of water. By telescopes I assume you mean you can move it? We don't have anything like that down here.
Nobody has ordered 1 so that everyone else has to order one on their truck or spend the money to put it on their older trucks.
Permalink Reply by FETC on October 22, 2008 at 9:59pm
10" square opening on all three sides. Press a button and the chrome door lifts open and the square chute then remotely slides out and extends 10-12" inches. Press another button and the jet dump valve opens. The pic is our tanker 2500 gallons and I never actually timed it but it is empty in less than 120 seconds.
Permalink Reply by Just Plain Craig Moyer on October 23, 2008 at 8:45am
I've never seen this without threads so its my bad. I al;so don't see the advantage of having a quick dump positioned like that. Is there something that slides out so the tanker doesn't have to get so close to the dump tank.
Permalink Reply by Robert on October 23, 2008 at 2:44pm
On our dept. we have a 4000 gallon tanker that has square dump's on both sides and the rear. They make dumping with this monster of a truck so much easier with no backing. Our 2000 gallon truck has only a square rear dump that telescopes and is powered from a switch in the cab.
Permalink Reply by Bendone on October 24, 2008 at 4:18am

This shows the differance in area betwwen the round and square dumps.
Permalink Reply by Jordan Finch on October 24, 2008 at 9:45pm


THIS IS OUR TANKER IT HAS ROUND DUMPS ALL AROUND AND BOTH SIDE DUMPS DO TELESCOPE OUT
Permalink Reply by LT Lake on October 27, 2008 at 12:22pm
Just a follow up. I went to a training burn this past weekend and got this shot of a side dump in operation.


Permalink Reply by Robert on October 27, 2008 at 1:15pm
the rear telescopes but not by remote just the dump is switch controlled although that would be nice. We also have a remotely controled deluge gun on the roof
Permalink Reply by Dean Shrider on November 1, 2008 at 1:17am

We have 2 tankers (tenders) here both are equiped with the 10" square dumps in which case we can dump all 3500gal of our 2006 Freightliner in 1min 50sec. Which we can dump to either side or to the rear and all are manually telescope pull out and push in. Have worked with our neighboring departments that have the 10" round with the automatic dump valves from the drivers seat. Which I will admit is nice when you are short on man power and every one counts during warm weather,but when the weather gets cold freezing or below you couldnt give me one to operate cold air on one side of a thin cover and water on the other guess what freezes closed? I have seen this way to many times and the driver has to get out and beat on the cap to try to get it loose for the water to come out. Ounce a driver used a pry bar to get it open and actually bent the cover and it would not close after dumping. Which took the tanker out of service since it wouldnt hold water. As for backing we have had to back at times into a tank and with a 38ft truck its not easy in tight dark areas good thing for cameras.

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