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Industrial Tanks - Frequently Asked Questions
1. Does KEFCO's warranty cover my specific chemical application? Or does it only cover specified workmanship and material failures?
2. How does the tank manufacturer calculate their specific gravity ratings? What hoop stress value was utilized to make the calculations?
3. Can KEFCO provide a wall thickness audit to verity ASTM-D1998-97 standards have been met?
4. What is the processed density of the finished tank wall?
5. What is the preprocessed density of the resin?
6. What chemical compatibility testing has KEFCO done to support their material recommendations?
7. What quality assurance testing documentation can the tank manufacturer provide on their raw materials?
8. What is the temperature and foot/lbs. test criteria KEFCO uses for their standard Impact Test?
9. Does KEFCO have an engineering staff that utilizes Finite Element Analysis (FEA) to predetermine tank stresses before new product designs are finalized?
10. Will KEFCO provide installation recommendations to assure all fittings and accessory attachments decrease tank wall stress and maximize long-term ability to resist leaking?
1. Does KEFCO's warranty cover my specific chemical application? Or does it only cover specified workmanship and material failures?
All KEFCO tanks have a standard 3 year warranty against defects in material and workmanship. Additionally, KEFCO offers extended warranties up to 8 years for many chemical applications. Furthermore, KEFCO offers "Chemical Specific" warranties on chemical applications listed in our chemical resistance chart.
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2. 2. How does the tank manufacturer calculate their specific gravity ratings? What hoop stress value was utilized to make the calculations?
ASTM-D-1998-97; 600 P.S.I. Hoop Stress
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3. Can KEFCO provide a wall thickness audit to verity ASTM-D1998-97 standards have been met?
Yes, but we do ask that this request be made at the time a purchase order is released.
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4. What is the processed density of the finished tank wall?
Up to .946 on tanks with wall thickness greater than ½"
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5. What is the preprocessed density of the resin?
.942 Linear; .938-.941 cross-linked
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6. What chemical compatibility testing has KEFCO done to support their material recommendations?
In addition to almost 30 years of field results and warranty claim data, KEFCO funds ongoing independent chemical testing jointly with the University of Nebraska and Exxon Chemical. To our knowledge, KEFCO is the only tank manufacturer to fund independent chemical testing for polyethylene tanks.
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7. What quality assurance testing documentation can the tank manufacturer provide on their raw materials?
Upon receipt of raw material certification for a specific lot of material, KEFCO conducts impact tests, ESCR tests, and flowability tests.
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8. What is the temperature and foot/lbs. test criteria KEFCO uses for their standard Impact Test?
400 ft/lbs. at -40 degrees Fahrenheit for tanks ½" wall thickness or greater, 200 ft/lbs at -40 degrees for tanks less than ½" wall thickness, which exceeds ASTM standards requirements and all competitors'.
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9. Does KEFCO have an engineering staff that utilizes Finite Element Analysis (FEA) to predetermine tank stresses before new product designs are finalized?
KEFCO is the ONLY known polyethylene tank manufacturer who can document the use of FEA in a tank design.
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10. Will KEFCO provide installation recommendations to assure all fittings and accessory attachments decrease tank wall stress and maximize long-term ability to resist leaking?
KEFCO has the industry's largest engineering staff available to supplement installer's efforts in reducing risk and ensuring long-term safety. Every KEFCO tank shipped includes a copy of our "Use and Installation Guidelines".
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