E.P.C. Series air oil tanks.

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NOPAK CANADA INC air-oil tanks are used as a simple, economical method to supply a make-up source of oil to any hydraulic circuit. Mounting the tank in a vertical position above the circuit that is being provided automatically bleeds the entire circuit system. The air supply to the air over oil tank is supplied by the same shop air source that provides low-pressure power to the booster. In addition, air-oil tanks offer a means of smooth hydraulic speed control.

Design Features:

1-Baffles on either end of the tank to reduce turbulence caused by rapid air intake and oil discharge, causing aeration, whirlpooling, and foaming.

2-Replaceable sight gauge mounted in heads on the tank side. The transparent plastic sight tube clearly shows oil levels in the tank and is compatible with most hydraulic fluids.

3-Large pipe ports enable the quick filling or draining of the tank. Aluminum heads are standard for 2 1/2” through 8” tank diameters.


Tanks are also available with glass wound filament fiberglass tubing.
Because it is translucent, it provides a visual oil level indication. This
eliminates the use of a sight gauge. Fiberglass tubing has the highest strength-to-weight ratio commercially available. It has a higher
resistance to high impact and dents than brass or aluminum tubing.
Corrosion resistance to various chemicals, acids, high moisture, and other severe conditions makes for a trouble-free operation in
most environments. Nopak can economically supply you with either tank, depending on your preference or specification.

How to select the correct-sized air-oil tank:

-Determine the bore diameter and stroke of the working cylinder.

-Calculate the cubic inch oil displacement of the working cylinder by multiplying the pIston square inch area times the stroke in inches. (Use Table B Blind End Displacement for piston square
inch area for ready reference.) Your determination will result in the cubic inch displacement volume requirement to select an air-oil tank. See the tank selector chart below to determine the proper choice. Select a bore-height combination with a capacity closest to, but larger than, 188.55 cu”. Your options are the 4-inch diameter bore with a 21-inch long tank length, the 5-inch bore with a 14-inch tank length, or the 6-inch bore with an 11-inch tank length.

Economics recommends that your selection be the smaller 4-inch diameter bore with the 21-inch long tank length. This, of course, is predicated on available space. The smaller bore tanks are generally less costly than, the larger bore. Exceptions to this are the booster tank combination, which makes your selection be that the tank diameter be the same as the booster. The following selection would be the type of mount applicable to your requirements. See the chart on the opposite page for selection and dimensions. Nopak offers Models H, S, T, TB, and AP as a standard. However, other mounting styles can be selected from Catalog 109CEPC. When boosters and air-oil tanks are ordered, specify whether air-oil tanks should be separate or integral. It is assumed that air-oil tanks are to be separate unless specified.





E.P.C. Series air oil tanks.

E.P.C. Series air oil tanks.