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Vertical Storage Tanks

FAQ'S FOR LIQUID STORAGE TANKS

WHAT MATERIAL IS USED TO MAKE YOUR TANKS?

NORWESCO uses a linear, high-density polyethylene resin that provides outstanding environmental stress crack resistance. The resin is UV stabilized but by keeping the tank sheltered or indoors you will prolong the life of your tank.

ARE YOUR TANKS FDA APPROVED?

The resins used to manufacture our tanks meet specifications contained in FDA Regulations 21 CFR 177.1520, (c) 3.2 and so may be used as an article or component of articles intended for use in contact with food, subject to any limitations in the regulation.

HOW MANY POUNDS PER GALLON WILL YOUR TANK HOLD?

NORWESCO produces two grades of polyethylene tanks - premium and heavy duty. The NORWESCO premium weight tank has been designed and is manufactured to meet a specific gravity of 1.5, equaling 12.5 pounds per gallon at 73 degrees F. The NORWESCO heavy-duty tank has been designed and is manufactured to meet a specific gravity of 1.9, equaling 15.75 pounds per gallon at 73 degrees F. (An increase in liquid temperature will substantially decrease the specific gravity rating!)

CAN I STORE CHEMICALS OR FERTILIZERS IN THE BLACK VERTICAL STORAGE TANKS?

No, these tanks are designed for water storage only. They are rated at 8 pounds per gallon.

WHAT IS THE WALL THICKNESS OF YOUR TANKS?

We refer you to the paragraph above that relates to specific gravity/pounds per gallon. Because the wall thickness varies from top to bottom on a tank, it is not the best gauge for determining the quality of a tank. The very bottom of the tank is the thinnest part of the tank and is made that way to flex when the tank is empty or full. The actual weight of the tank is also not a good comparison when shopping for tanks. Just because a competitor may use more material in the tank does not make it a better tank. That is determined by the resin, mold design and the steps taken during the rotomolding process.

WHAT IS THE MAXIMUM TEMPERATURE THAT YOUR TANKS WILL WITHSTAND?

Polyethylene storage tanks have a maximum storage temperature of 120 degrees F. Contents with a temperature in excess of 120 degrees F-even for a short period of time-can weaken the tank's structural integrity and make it susceptible to deformation and failure.

WHAT WILL HAPPEN TO MY TANK IF I LEAVE IT OUTSIDE IN FREEZING TEMPERATURES?

The tank itself does not have a minimum temperature rating. If you plan to keep the liquid in the tank and you know that it will freeze, make sure that you leave room for expansion. The most likely part to crack on the tank is the bulkhead fitting which can be easily replaced.

WHAT CHEMICALS CAN I STORE IN THE TANKS?

We recommend that you contact the chemical supplier to see if their product is compatible with high density, linear polyethylene. If they cannot answer your question, call our Customer Service department and they will be happy to research it for you. Try to have as much information available as possible such as the temperature of the product, the percentage of product (Ex: Hydrochloric Acid, 50%) etc.

CAN I STORE PETROLEUM PRODUCTS IN THE TANKS?

We recommend that you do not store petroleum products in our tanks because they will soften the tank walls.

HOW MANY YEARS WILL MY TANK LAST?

There is no good way to determine the life span of a polyethylene tank. Many variables can have an effect on the tank - what type of material is being stored in the tank? Is the tank used indoors or outdoors? If the tank is outdoors, what part of the country are you located in? Tanks used outdoors in Arizona or Florida are subjected to more intense sunshine than in Minnesota for example. UV rays will have a detrimental effect on the life span of any poly tank. Is the tank being used strictly for stationary storage or for transport? Each of these factors will have an effect on a polyethylene tank. Should you have a problem with a NORWESCO tank we feature warranties from three to five years. Please consult with your distributor or dealer.

WHAT IS THE WARRANTY ON YOUR TANKS?

The premium weight tanks and black vertical water storage tanks carry a three year warranty from the date of manufacture and the heavy duty tanks carry a five year warranty from the date of manufacture. Should a defect appear within the warranty period, NORWESCO would supply a new, equivalent tank in replacement thereof. NORWESCO's liability is limited to the value of the tank itself and specifically excludes the cost of installation, removal or of consequential damages.

HOW CAN I TELL WHEN MY TANK WAS MANUFACTURED?

All NORWESCO tanks are stamped with a serial number. Contact our Customer Service department and give them the number and they will be able to tell you when the tank was manufactured.

CAN YOUR TANKS BE PRESSURIZED?

No, our tanks cannot be pressurized.

CAN YOUR TANKS BE BURIED?

Tanks specifically designed for above ground use cannot be put underground. If it is put below ground, the weight of the earth around the tank will cause the walls to collapse. We do make septic and cistern tanks that are designed to be buried. See "Water & Waste Management Tanks" under Main Links.

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