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Industrial Technical -
Frequently Asked Questions
- Does Snyder's warranty cover my specific
chemical application? Or does it only cover specified workmanship and
material failures?
- How does the tank manufacturer calculate their
specific gravity ratings? What hoop stress value was utilized to make
the calculations?
- Can Snyder provide a wall thickness audit to verity
ASTM-D1998-97 standards have been met?
- What is the processed density of the finished
tank wall?
- What is the preprocessed density of the resin?
- What chemical compatibility testing has
Snyder done to support their material recommendations?
- What quality assurance testing documentation
can the tank manufacturer provide on their raw materials?
- What is the temperature and foot/lbs. test
criteria Snyder uses for their standard Impact Test?
- Does Snyder have an engineering staff that utilizes
Finite Element Analysis (FEA) to predetermine tank stresses before new
product designs are finalized?
- Will Snyder provide installation
recommendations to assure all fittings and accessory attachments
decrease tank wall stress and maximize long-term ability to resist
leaking?
1. Does Snyder's warranty cover my specific
chemical application? Or does it only cover
specified workmanship and material failures?
All Snyder tanks have a standard 3 year warranty against defects in
material and workmanship. Additionally, Snyder offers extended warranties
up to 8 years for many chemical applications. Furthermore, Snyder offers
"Chemical Specific" warranties on chemical applications listed
in our chemical resistance chart.
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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 Snyder 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 Snyder done to support their material recommendations?
In addition to almost 30 years of field results and warranty claim data,
Snyder funds ongoing independent chemical testing jointly with the
University of Nebraska and Exxon Chemical. To our knowledge, Snyder 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,
Snyder conducts impact tests, ESCR tests, and flowability tests.
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8. What is the temperature
and foot/lbs. test criteria Snyder 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 Snyder have an engineering staff that
utilizes Finite Element Analysis (FEA) to predetermine
tank stresses before new product designs are finalized?
Snyder is the ONLY known polyethylene tank manufacturer who can document
the use of FEA in a tank design.
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10. Will Snyder provide installation
recommendations to assure all fittings and accessory attachments decrease
tank wall stress and maximize long-term ability to resist leaking?
Snyder has the industry's largest engineering staff available to
supplement installer's efforts in reducing risk and ensuring long-term
safety. Every Snyder tank shipped includes a copy of our 34 page "Use
and Installation Guidelines" on installation recommendations.
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