American® Pump Tanks

5-Year Limited Tank Warranty*

Pump Tanks by American Water Heaters

Download Spec Sheet

Download In-Line Pump Tank Installation Manual

Download Free-Standing Pump Tank Installation Manual


 



American Pump Tanks have a smooth, dependable diaphragm design and operation provides precise control of system operation cycles.

Features:
  • • Free-standing and in-line vertical tanks are available, as well as horizontal tanks with universal pump mounting bracket.
  • • Metal air valve, 100 PSI working pressure.
  • • Multiple head construction provides added structural strength and more capacity within the same diameters.
  • • Interior epoxy coating is permanently bonded to the tank shell to provide the ultimate protection on the water side of the tank.
  • • Durable Butyl Diaphragm Ensures long life
  • • Positive Lock Retention System: Quality controlled compression in the diaphragm connection eliminates loss of air or water leaks in the tank.
  • • Electrostatically Applied Powder Coated Exterior: Tough powder coating provides the ultimate exterior protection and is undercoated with zinc phosphate for the highest corrosion resistance.

Pre-Pressurized Pump Tank Operation Cycles

Start-Up Cycle*
Diaphragm is pressed
against the bottom of
the chamber. Fill Cycle*
Water is pumped into the
reservoir, which forces the
diaphragm upward into
the air chamber. Hold Cycle*
Pump-cutoff pressure is attained.
Diaphragm reaches its uppermost
position. Reservoir is now filled to
its rated capacity. Delivery Cycle*
Pump remains shut off while<br/>air
pressure in top chamber forces
diaphragm downward, delivering
water to system.
Start-Up Cycle*
Diaphragm is pressed against the bottom of the chamber.
Fill Cycle*
Water is pumped into the reservoir, which forces the diaphragm upward into the air chamber.
Hold Cycle*
Pump-cutoff pressure is attained. Diaphragm reaches its uppermost position. Reservoir is now filled to its rated capacity.
Delivery Cycle*
Pump remains shut off while
air pressure in top chamber forces diaphragm downward, delivering water to system.


* Based on 30-50 PSI operating system.

Sizing

The charts below allow you to easily select the right American APT Series tank for standard-size pumps between 2-1/2 and 30 gallons in capacity and for 20-40 PSI, 30-50 PSI and 40-60 PSI pressure ranges. Minimum run times shown (from start-up) are 1 minute, 1-1/2 minutes and 2 minutes. For example, for a system that delivers 12 GPM at 30-50 PSI, with a minimum run time of 1 minute, Chart 1 indicates that the proper tank is the APT-45.

American Pump Tanks Sizing Charts

If proper tank selection cannot be made using Chart 1, follow this procedure. First, find the “drawdown multiplier” by matching the pump start-up and shut-off pressures on Chart 2. For example, the multiplier for a 30-50 PSI pressure range is .31.

Next, insert the pump GPM capacity and desired minimum run time into this formula:

To assume dependable drawdown volumes, and in keeping with present industry practice, drawdowns are based on Boyle’s Law. For example, using a 10 GPM pump, a one-minute minimum run time, and a 30-50 PSI pressure range, the formula is as follows:

Then, using Chart 3, select the tank that has a minimum volume that meets or exceeds your minimum volume requirement and supplies adequate drawdown at the required pressure range. Minimum drawdown equals Pump GPM X Minimum Run Time. Therefore, in the above example, select the APT-45 45-gallon tank. It provides adequate drawdown at 30-50 PSI.


American® Pump Tank Models

     

Model CAPACITY DRAW DOWN
30-50 PSI
CONN SIZE
NPT INCHES
A
INCHES
B
INCHES
C
INCHES
SHIPPING
WEIGHT LBS
FREE-STANDING PUMP TANKS
APT-14 14 4.3 1 F 24 2 15-3/8 24
APT-20 20 6.2 1 F 31 2 15-3/8 34
APT-26 26 8.1 1 F 38-1/2 2 15-3/8 40
APT-32 32 9.9 1 F 46 2 15-3/8 52
APT-45 45 13.9 1-1/4 F 35-1/2 2 22 65
APT-65 65 20.1 1-1/4 F 47-1/2 2 22 90
APT-85 85 26.7 1-1/4 F 60-1/8 2 22 114
APT-86 86 26.6 1-1/4 M 46 2-1/2 26 116
APT-119 119 37.0 1-1/4 F 61 2 26 161
IN-LINE PUMP TANKS
APTI-2 2 .6 3/4 M 10-3/16 - 8-1/4 5
APTI-5 4.6 1.4 3/4 M 14-3/4 - 11 9
APTI-7 26 2.3 3/4 M 21-1/16 - 11 12
HORIZONTAL PUMP TANKS
APTH-7 7 2.3 3/4 M 12-7/8 21-1/16 11 12
APTH-14 14 4.3 1 M 20 - 15-3/8 24
APTH-20 20 6.2 1 M 28 - 15-3/8 34

American Pump Tanks Sizing Diagram



For complete information on limited warranties, consult written warranty or contact the American Warranty
and Service Support team at 1-800-456-9805.