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Polyethylene Tanks #101

Plastic tanks are available from our 14 manufacturing plants around the country.

1. Our polyethylene tanks are built to ASTM 1998 Specifications for Rotationally molded plastic tanks. From a technical standpoint our calculations include additional safety allowances for wall thickness calculations. The calculation parameters allow us to extend to you, a 3 year warranty on our 1.5 specific gravity tanks and a 5 warranty on our 1.9 specific gravity tanks.

For a review of this specification:  ASTM-1998 Specifications for Rotationally Molded Polyethylene

2. Our tanks comply with NSF 61 standards and are approved by NSF for water and food related product storage, NSF is short for the National Safety Foundation.

For a review of the NSF site:  http://www.nsf.org

3. Please consider the following design considerations for your tank installation..

a. Venting your plastic potable water tank. Proper venting will consider the air coming into your plastic water tank during the pump down cycle, consider the potential for ambient air born dust, pollen, and possible chemicals. Cleaning this vent air may be accomplished with HEPA filters, bag filters, scrubbers, dust collectors are a few of the ways to solve the vent air aspect of your application.

b. Direct sunlight and photosensitizes precipitate, maintain and excellent the growth of algae. We can mitigate this problem by either installing the translucent plastic tank indoors or we can make the water tank of an opaque material, black or dark green is best.

c. Chemical treatment of your water and subsequent storage offers unique opportunities and downsides. Success of treatment may be lessened by time, chlorination is an example of when water is treated with Chlorine it should be used soon and not stored for a long period as the Chorine will loose its strength after mixing with water. Other chemicals offer their own challenges and should be considered and integrated in your design.

d. Piping attached to ANY tank should include consideration for the expansion and contraction of the tank as it goes through its full and empty cycles. The wall of a large tank may expand up to 2" inches, depending on things like the materials of construction, specific gravity design and the height of the vessel, the moving or motive force is hydrostatic head. Integrating the effects of these forces allow you to design allowances for this expansion and contraction, various methodologies, expansion joints, hose and angular plumbing relationships, consideration of this force on your plumbing will extend the operational life of the installation.

We are pleased to offer you our 20 years of experience in water and chemical storage container solutions using Linear Polyethylene Plastic Tanks, we look forward to your questions as we provide you with right solutions in Plastic Water Tanks.

Pipe supports; support piping on your tanks, do not allow piping systems components to hang from your process connections, doing so will void warranties.  Call for more information.

Tie down systems, seismic and wind are available and designed for requires of a particular geographical area. Again call to discuss.

Gene Vincent, Your in house Tank Expert...

Take a look at http://www.tanksystems.com for more information on fiberglass and rotationally molded polyethylene tanks.

01/15/2010 Copyright by Amprotec  Houston, Texas USA - Author Santos Vega 281-825-4054