Here’s what you need to know.

One of the things most Fire Departments don’t realize when spec’ing out a new tanker with a dump or dumps is that when the tank is manufactured, there are lips surrounding the dump flange installed on the water tank as shown in the example picture.

Why is this seemingly useless bit of information important?  If you order a new 3,000-gallon tanker with the required tank dump(s), the tank will never dump all the water that has been carried in the tank because of those pesky flange lips.

So, for example, there could be anywhere from 50 to 100 gallons of water, and sometimes more, remaining in the bottom of the water tank, caught at the tank flange(s) that could not be dumped.

If a tanker is running a shuttle, and the tanker makes ten (10) runs, that would mean that between 500 and 1,000 gallons of water never made it to the drop tank.

Fixing this issue is very simple, whatever your department decides on for a water tank size, add 100 gallons to the capacity you are specifying, so the above example tanker would be ordered with a 3,100-gallon water tank.  Most of the time there will not be an upcharge for an extra 100 gallons added to your tank, so it’s a win-win for the Fire Department.

Now when you dump your water tank, the full 3000 gallons will be dumped which is what you intended when you specified your water tank size.


Scott Zingaro is a Fire and Rescue Sales Manager with Goodman Specialized Vehicles. Contact Scott