Recovery Tank Info: A Tank is Not Just a Tank

Recovery tank design is one of the most crucial aspects of truck mount design.  A tank made with maximum airflow in mind will interfere much less with system vacuum than a tank made to be "functional and inexpensive".

How? Because a tank that's not designed well, forces the airflow through obstacles and direction changes unnecessarily.  Even the plumbing connected to the exterior of the tank can make a big difference. (For instance, 90- degree elbows introduce significant resistence to airflow as the airflow is forced to make a sharp 90- degree turn in such a tight area.)

The airflow of the vacuum side of a truckmount has only a certain amount of force (called, "inches of lift")  to pull it through the intake and push it out the exhaust port.  And when resistence is encountered, part of that total is used up.  The more resistence, the less force is remaining, so vacuum strength is reduced.

More on this very soon.

Truth in tank capacity...  Why doesn't one manufacturer's 65 gal. tank hold 65 gallons, when another's does? Simple: Some manufacturers quote the tank capacity as if 100% of the tank is available to be used.  But the truth is, that unless the blower filter is raised up out of the tank, it's simply impossible to use 100% of the tank. 

For instance, if the filter is of a "barrel" type and is 5" in diameter, then, at a minimum, 5" in height of the tank is not available, in order to keep the filter from being "flooded".

Even moreso, the water level in the tank should be well- below the filter, in order to keep the filter completely full of debris.  So, the actual amount of reduced height is more reasonably, 8 inches, allowing 3 inches below the bottom of the filter.

What does all of this really mean?  Well, a common tank size used in our industry is said to be "65 gallons".  It's 12" front to back, 34 inches high and 36 inches long.  So, 12 x 32 x 36 equals 13,824 cubic inches.  And there are 230.4 cubic inches per gallon.  So, the total capacity of such a tank is 63.75 gallons.  But, subtracting 8" for the filter, the result is actually 48.75 gal.

ONE THING YOU CAN BE SURE OF...   When we tell you that our tank has a certain amount of "usable capacity", we've taken the above into account and given you accurate usable capacity.