ATL Storage Tanks

ATL Tanks

ATL Tanks - Flexible Storage Tanks.


This Manual provides information and instructions for the proper selection, installation, operation, maintenance, storage, cleaning and repair of ATL Flexible Storage Tanks.

At the time this Manual was originally prepared,


referred to all it's Flex Tanks as Petro-Flex. Today, the choice of tank materials has significantly broadened and addition designations have been added. (Such as Type-R, Type-V or ChemFlex). Nevertheless, even though we refer to Retro Flex Tanks throughout this manual, the procedures and instructions still apply to ail ATL Flexible Storage Tanks.

That is the 100 gallon Fuel Locker. There's many different sizes and models to choose from though.

ATL Flexible 
              Storage Tank filled up and ready to go




" is an ATL trade mark referring to collapsible rubberized containers for storing liquids, gases or powders. When empty, these flex-tanks fold into a compact bundle for easy storing and transporting. On filling, they assume a "pillow" shape and can be used for either static or mobile containerization.

- Petro-Flex tanks are constructed from rubberized fabric laminates. Durability and puncture resistance are built-in by combining high-tensile woven fabrics with antiabrasion coatings of synthetic elastomers. Flanges, handles,filler and vent are standard equipment on Petro-Flex containers.

The figure below depicts the general arrangement of fittings and other equipment on a typical Petro-Flex.Optional equipment and accessory items are available.

Contact the factory for details.

Petro-Flex tank

Other fittings and accessories available.

Petroleum products

and industrial chemicals are prime candidates for storage in Petro-Flex containers. However, a wide variety of liquids, gases, and granulated solids may also be safely stored in these tanks. Chemical compatibility
charts appear in a later section and should be carefully reviewed.

- Each Petro-Flex tank is supplied with an emergency repair kit for field use. Permanent patch kits are also available as described herein.

- Tanks through 1000 gallon (3800 liter) capacity are shipped in heavy-wall corrugated cartons. Larger tanks are typically delivered in wooden crates suitable for repetitive packing and transporting.

- Handles are provided on the larger Petro-Flex units to facilitate moving the tank when empty. Do not use the handles to attempt relocating a full tank.

PETRO-FLEX TANKS 100 gal. to 2000 gal.


Other fittings and accessories available.


Size is the first consideration

in selecting a Petro-Flex tank. Consider the highest capacity requirement of the job, and select the tank that is at least that large. Rated capacities are maximums and must never be exceeded. The manufacturer offers a wide range of volume sizes, with other capacities available on special order.

Shape is frequently an important consideration

. Most Petro-Flex tanks are square, so as to optimize the capacity to-ground-area ratio. However, rectangular and circular configurations are also available. Consult the current tank listings, and discuss custom shapes directly with the manufacturer.

ATL Flexible Storage Tanks

are available in a wide variety of materials. To select the proper type, consult the Chemical Resistance Chart in the appendix and then contact the factory to confirm your choice.

Petro-Flex containers

are used for safe storage of gasoline, avgas, jet fuels, diesel, transformer oils, fuel oils, vegetable oils, gasohol (10%), hydrocarbon synfuels, lube oils, bunker C, kerosene and a variety of fuel additives.

Chem-Flex pillow-style tanks

provide an instant storage medium for potable water, vegetable oils, alcohols, organic and inorganic acids, brines, slurries, molasses, alkalies, glycols, effluents, fertilizers, detergents, pesticides and many industrial chemicals.

Fittings and Flanges

must also be selected for fluid compatibility.

- The

standard fittings

are steel and aluminum with 2" Female NPT. If different materials or sizes are required consult with the factory for available choices.

Consider the environment and especially the terrain

in regard to maximizing the service life of the Petro-Flex tank.


Protective items

such as Ground Cloths and Heat Shield Covers are explained in the ATL Industrial Products Catalog. These are worthwhile additions to most Petro-Flex installations.

Evaluate the necessary connections for filling

, draining and venting the Petro-Flex tank. A comprehensive line of compatible valves, couplers, hoses, elbows and fittings are offered to complete the fluid storage system.

- When ordering Petro-Flex tanks, always specify the following information:

Capacity - Temperature Range
Part No. - Size of Apertures Desired
Dimensions - Location of Installation
Type Material - Stationary or Mobile Application
Type Fittings - Accessories Desired
Fluid to be Stored - Shipping Instructions


Site Preparation

Petro-Flex tanks

should be positioned only on a fully cleared flat area. When all sharp objects such as stones and sticks cannot be removed, an ATL Ground Cloth must be used to protect the tank's bottom surface.

The site should be 10% longer

and wider than the tank, with a maximum allowable slope of 3°.

For complete draining

, dig a hole 36" x 36" x 2" beneath the discharge or drain fitting to serve as a collection sump.


Hazardous materials

require positive containment in case of spills or overflow. A proven safeguard is the lined earthen dike system.

The dike

should be constructed as indicated in the adjoining figure.

Internal volume

of the enclosure must be 1.5 times greater than the tank volume.


are necessary to relieve rain water accumulations. These are normally closed and opened only as needed.

When collection of vapors

can cause an explosion hazard, dikes should be designed low and distant to the tank.

Erosion protection

is achieved by covering dikes with stone, sod or other vegetation.

Tank Set Up

Remove the Petro-Flex tank

from its container. Strip off all tape and protective plastic sheeting.


Check the Chemical Resistance

Chart (herein) to assure the compatibility of the tank and fittings with the fluid to be contained.


Unplug the vent

and fill/discharge ports after the tank is positioned properly on its site. Make a visual inspec tion of all fittings to assure cleanliness.


Assemble the vent

and relief valve using a suitable thread sealer to avoid possible leakage.


Connect fill/discharge line

using a 90° elbow and shut-off valve. (ATL #202040 available as option.)



Attach the fill line to the tank inlet

, and check the vent to assure it is not plugged. While filling, observe the tank body, fittings, and vent for possible leakage. Handling hazardous liquids requires strict adherence to local and Federal safety/pollution regulations.

DO NOT exceed the rated capacity of the tank

when filling. Use these general height limitations to avoid any over-stressing:

Maximum Height for Square Tanks holding Fluids of 1.2 Specific Gravity or less

100 to 250 gal.........................1.5 feet
500 to 1,000 gal.......................2.0 feet
1,500 to 2,000 gal......................2.5 feet
2,500 to 3,000 gal......................3.0 feet
4,000 to 5,000 gal......................3.5 feet
6,000 to 10,000 gal.....................4.5 feet
15,000 to 50,000 gal....................5.5 feet
100,000 gal..........................6.0 feet

If the tank exhibits a tendency to roll

, level the area or place sandbags along the edge as support.



Since the tanks are collapsible,

discharge rates are not limited by venting. The outlet port "floats" on the surface of the liquid, generally avoiding any sediment that may collect at the tank bottom.


To withdraw the last few gallons

, lift or roll up the opposite tank end and force the liquid toward the discharge fitting.


General Maintenance

A visual inspection

should be made during and after each filling to reveal any possible damage or leakage.


Access Plates and Fittings

should be tightened periodically to the recommended torque. (40 in. lbs. for 1 /4-28 Bolts)


The vent system

must be kept clear and fully operational.


All fittings and Tank surfaces

should be kept as clean and free from debris as practicable.


The tank

should be kept in a well repaired condition. Any exposed fabric, tears, punctures, etc. should be repaired immediately. Frequent and regular inspections will permit these repairs to be made while the damaged area is small and easily


Do not place heavy or sharp objects

on the tank when it is full. Walking on the tank should be kept to a minimum.


Handles are provided

for use during set-up of an empty tank. Do not attempt to use the handles to lift or move a tank with any amount of fluid in it.

Storage-Short Term

(Less than 60 days)


Empty the Petro-Flex tank.

It is not generally necessary to remove the last few gallons of liquid if the tank will be stored for a short period of time and then reused with the same fluid.


Fluid may be removed

by folding or rolling one end of tank toward an open access fitting.

Remove all auxiliary hardware and fittings

from the tank. Leave original flange plates in place.

Remove Vent Pipe and Vent

Valve from the tank.

Seal all openings with caps

or protective coverings tokeep the tank interior clean.

Pad all tank flange plates

with protective cloth or foam.

Roll or fold the tank from both sides

to center and then from both ends to the center. See Brush off all stones and miscellaneous debris that may be picked up from the ground as the tank is being folded.

Carefully pack the folded tank

in it's crate and store indoors in a cool, dry area. Care should be taken not to damage the tank by rough handling or careless storage.


Recommended storage conditions are:

Temperature: 32°F to 90°F (0°C to 32°C) Relative Humidity: 20% to 90%

Storage—Long Term

(60 days or Longer)

- Drain tank completely, clean and dry thoroughly

Remove all auxiliary hardware and fittings

from the tank. Leave original flange plates in place.

Remove Vent Pipe and Vent Valve

from the tank.

Seal all openings

with caps or protective coverings to keep the tank interior clean.


Pad all tank flange plates

with protective cloth or foam.


Roll or fold the tank

from both sides to center and then from both ends to the center. (See Section 10) Brush off all stones and miscellaneous debris that may be picked up fromthe ground as the tank is being folded.


Wrap the folded tank

in polyethylene film, carefully pack in it's crate and store indoors in a cool, dry area. Care should be taken not to damage the tank by rough handling or careless storage.


Recommended storage conditions are

Temperature: 50°F to 80°F (10°C to 27°C)Relative Humidity: 20% to 70%

-These Procedures are acceptable for storage up to three years. Tanks may be stored for longer periods provided they are factory inspected prior to use.


Empty the tank as completely as possible

. It is not generally necessary to remove the last few gallons of fluid if the tank will be stored for a short period. However, if the contained fluid is hazardous, or if extended storage is expected, then the tank should be cleaned thoroughly inside and out.


Remove all heavy metal fittings

and pad all light fittings with cloth or foam rubber.


Smaller Petro-Flex tanks

may be carefully folded, but larger units should be curled into a loose roll as shown below:

Remove any rough edges inside

the storage crate and line that box with plastic film. Place the Petro-Flex carefully into the crate and store in a dry dark area. Storage at or near room temperature is best for tank longevity.

-Tanks under 1000 gallons (3800 liters) may be shipped in heavy wall corrugated cartons. Larger tanks require a skid or wooden crate for safe transportation.

600 gallons on the bow, 1000 gallons in the pit and 2750 in the tanks! Going for a boat ride on the Done Deal. Fishing Emerald Coast Blue Marlin Classic out of San Destin.


ATL Flexible Storage tanks are available in two basic styles:

PBtro-Flex® and Chem-Flex™

Within these two styles of flex tank there are various material choices available. The most common types are as follows:

A. Type-P Petro-Flex
B. Type-R Petro-Flex
C. Type-V Chem-Flex
D. "type-H Chem-Flex

By selecting the proper type and style

of Flex Tank, the User can safely store almost any conventional fluid. For very exotic chemicals or extremes of environment, special rubber compounds can be supplied. Information for such custom tank designs can be obtained by contacting the manufacturer. Aero Tec Laboratories Inc.


"Type-P" Petro-Flex tanks

are constructed of a new and proprietary Polyurethane compound reinforced with a high tensile woven fabric. This synthetic rubber formulation provides outstanding abrasion resistance, high adhesion to
the supporting fabric, and excellent resistance to liquid permeation. Generally, "Type-P" tanks are best suited to gasoline, Avgas, diesel fuel, synthetic lubricants and most petrochemical blends.

"Type-R" Petro-Flex tanks

are constructed of a new and unique elasticized polyolefin compound reinforced with a high tensile woven fabric. This special coated fabric provides superior oil, temperature, environmental, and chemical
resistance. Generally, "Type-R" tanks are suitable for use with oils, non-aromatic fuels, non-potable water, mild acid and alkali solutions.

"Type-H" Chem-Flex tanks

employ a unique FDA approved compound of chlorosulfonated polyethylene coated on a high strength base fabric. Features of this new synthetic elastomer include high and low temperature resistance, broad
chemical immunity, complete flexibility and superior weathering stability. "Type-H" tanks are most often used for the storage of potable vyater, edibles, acids, alkalies, sewage and alcohols.

"Type-V" Chem Flex tanks

are constructed of a special modified PVC compound coated on a high strength woven fabric. This material features good abrasion resistance, broad environmental resistance, high tensile strength and excellent coating adhesion. 'Type-V" tanks are generally used for chlorinated water, sewage, mild chemical solutions and liquid fertilizers.

All Petro-Flex and Chem-Flex flexible storage tanks

feature aluminum and steel flanges and fittings as standard equipment. Special fittings of stainless steel, rubber or plastic are also available on special order. Contact the manufacturer for details.



ATL - Aero Tec Laboratories Inc.

Ramsey, New Jersey

tel: 07446-1251 USA
Tel:201 -825-1400

Fax:201 -825-1962

How to make boat holding tank constructed of plywood with multiple coats of epoxy resin.