Division Specific FAQ's
General
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Frequently Asked Questions
What makes poly tanks a good choice for my chemical
storage/application?
What chemicals can I store in your tanks?
What material does Snyder use to manufacture
it's poly tanks?
Which tank material is best?
How heavy a material can polyethylene tanks hold?
What is the wall thickness of your tanks?
Are your tanks FDA compliant?
What is the maximum temperature that your
tanks will withstand?
Can I store petroleum products in your tanks?
Can I store BIODIESEL in your tanks?
Can I store DEF (Diesel Exhaust Fluid) in your tanks?
Can your tanks be pressurized?
Can your tanks be buried?
What is the warranty on your tanks?
How many years will my tank last?
Will freezing temperatures hurt my poly tank?
Is there some way to tell when my tank was made?
1. What makes poly tanks a
good choice for my chemical storage/application?
Poly tanks are lower cost than stainless steel or fiberglass
Lightweight - less than one-half the weight of steel
Seamless construction for easy cleaning and leak proof service
Exceptional Impact resistance
Broad range of chemical resistance
Better weatherability
Available in a variety of resins
Translucent when molded of natural resin for visible liquid level
Virtually maintenance free
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2. What chemicals can
I store in your tanks?
Poly tanks have a broad range of chemical resistance to both Agricultural
and Industrial chemicals. For Industrial Chemicals refer to the Snyder
Chemical Resistance Recommendation Chart on that site or contact the
chemical supplier to see if their product is compatible with high density
linear polyethylene (HDLPE) or cross-linked polyethylene (XLPE). If they
cannot answer your question, call Snyder Industries and we 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 percent concentration
of product (Ex: Sodium Hypo chlorite, 15%) etc.
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3. What material does
Snyder use to manufacture it's poly tanks?
Snyder uses HDLPE (high density linear polyethylene) to manufacture
our tank line. High density linear polyethylene has good structural
rigidity and impact resistance. It is resistant to a broad range of
chemicals including sulfuric acid, sodium hypo chlorite, and sodium
hydroxide.
We also offer, for specific applications XLPE (cross-linked
polyethylene). Cross-link polyethylene has excellent structural rigidity
and impact resistance. It is used as an alternative to HDLPE for storing
surfactants or solvent-based chemicals, or for higher service
temperatures.
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4. Which tank material is best?
General guidelines of material selection are not advisable. It is always
best to provide the tank manufacturer with specific application details
(chemical, concentration, specific gravity, temperature, dimensions,
mechanical loading) so a proper tank design recommendation can be made by
the factory and/or your Snyder distributor.
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5. How heavy a material
can polyethylene tanks hold?
A tank with a specific gravity of 1.5 can hold a liquid up to 12.5 pounds
per gallon at 100 degrees F. A tank with a specific gravity of 1.9 can
hold a liquid up to 15.75 pounds per gallon at 73 degrees F. Please note
that an increase in liquid temperature will substantially decrease the
specific gravity rating. Also, certain chemicals have environmental stress
cracking agents in them so higher specific gravity tanks are needed to
compensate even though the weight of the chemical may be lower. Please
refer to the Snyder Chemical Resistance Recommendation Chart or call
Snyder Industries to determine which tank design is best suited for the
chemical application.
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6. What is the wall thickness
of your tanks?
Because Snyder tanks have a stratiform wall thickness (varies from top to
bottom on a tank), wall thickness 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. Lower grades of resins
will require a thicker tank wall to compensate.
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7. Are your tanks FDA
compliant?
The resin used to manufacture our linear polyethylene tanks (HDLPE) meet
specifications contained in FDA Regulations 21 CFR 177.1520, © 3.2 an 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.
Cross-linked polyethylene (XLPE) tanks do not meet FDA regulations. The
HDLPE resin that Snyder uses is also NSF 61 listed.
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8. What is the maximum temperature
that your tanks will withstand?
Linear polyethylene (HDLPE) storage tanks have a maximum storage
temperature of 130 degrees F. Cross-linked polyethylene (XLPE) storage
tanks have a maximum storage temperature of 140 degrees F.
NOTE: The leading manufacturers in this industry design their tanks
based upon 100 degrees F with ASTM D 1998 calling out 73 degrees F. It is
important to contact the factory when your application will continuously
be above 100 degrees (ambient). The tank can be designed specifically for
your elevated temperature application.
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9. Can I store petroleum
products in your tanks?
We do not recommend storing petroleum products in our tanks because they
will permeate (soften) the tank walls. Contact Snyder with your specific
application. You will find that aromatic hydrocarbons and halogenated
hydrocarbons will not be recommended for polyethylene.
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10. Can I store BIODIESEL in your tanks?
Biodiesel is the name of a clean burning alternative fuel, produced from domestic, renewable resources. Biodiesel contains no petroleum, but it can be blended at any level with petroleum diesel fuel to create a biodiesel blend. Biodiesel or B100 (100%) refers to the pure fuel. Biodiesel blends or BXX refers to a fuel that is composed of a % of biodiesel blended into a conventional fuel (example B20 = 20% Biodiesel blended with 80% conventional fuel).
Snyder has conducted chemical compatibility testing on B100. Our chemical compatibility testing showed that Snyder’s uniquely processed HDLPE and XLPE resins are compatible with B100. From our chemical compatibility testing, Sii recommends ONLY above ground 1.9 specific gravity
Industrial (ASTM) designed tanks (600 psi hoop stress) for B100 applications. Snyder does not recommend below ground, agricultural or other non-ASTM designed tanks to be used in this application.
Snyder’s warranty for biodiesel B100 applications is one year (1) against defects in material and workmanship. Snyder may offer additional warranty other than the one (1) year warranty stated above. In such cases these warranty statements will be in writing only from Snyder.
Snyder’s chemical compatibility testing does not include any biodiesel blends so Snyder has no recommendation for biodiesel blends at this time.
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11. Can I store DEF (Diesel Exhaust Fluid) in your
tanks?
Yes, see the DEF listing on our
Chemical Resistance Recommendation Chart. DEF is a
high purity chemical solution containing 32.5% urea mixed with
high purity water. It is classified as a non-hazardous
product. Snyder Industries has a long history of proven
success providing both bulk storage tank and IBC solutions for
urea storage. DEF will begin to crystallize at 12º F.
and can loose its potency if stored for prolonged periods over
86º F so precautions should be taken (such as
heat trace and insulation) to ensure these conditions are
avoided.
The EPA has set forth stringent emissions requirements to
being January 2010 which will require diesel engine
manufacturers to choose a technology called Selective Cataytic
Reduction (SCR) to meet the requirements. When added to
the exhaust gases DEF reduces the NOx to the EPA required
levels. If you purchase a car, truck, tractor or any
diesel powered product with SCR technology it will require DEF.
There will be a separate DEF tank on diesel vehicles to hold the
DEF to be sprayed into the exhaust system.
DEF will be sold at service stations offering diesel fuel
across the USA in capacities ranging from gallon jugs, drums,
IBCs, and bulk dispensing systems. DEF will also be used
by companies who have their own fleet of diesel and fueling
stations.
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12. Can your tanks be pressurized?
No, our tanks cannot be pressurized. They are all designed to atmospheric
pressure.
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13. Can your tanks be buried?
Tanks specifically designed for above ground use cannot be put underground
because the weight of the ground around the tank can cause the wall to
collapse. If you have an application for a below ground tank we do have a
cistern and septic tank line available that is designed for below
ground use.
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14. What is the warranty
on your tanks?
Snyder warrants to the purchaser for any manufactured tank product proven
to be defective in material or workmanship within 3 years from date of
original invoice from factory. An extended tank warranty may be available as a
purchased option for an additional 2-year period (total of 5 years)
for some chemical applications.
Snyder also offers chemical specific warranties for industrial
vertical & double wall tanks for certain chemical applications
including sulfuric acid, sodium hypochlorite and others. Contact Snyder on
questions regarding warranty for your specific application.
Snyder warrants to the purchaser for any manufactured Intermediate
Bulk Container (IBC) or dry material handling product proven to
be defective in material or workmanship within 2 years (for polyethylene)
and 1 year (for steel) from date of original invoice from factory.
Contact Snyder on questions regarding warranty for your specific
application.
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15. How many years will my
tank last?
There are many variables that can have an effect on the life of a
polyethylene tank.
The type of material being stored in the tank, it's concentration,
and temperature. The temperature of the application can be a factor,
especially if the tank design is not based upon the temperature of the
application. Some applications may permeate the polyethylene at elevated
temperatures. Special considerations - some chemicals will have
long term affects on the polyethylene and may require special
considerations. As an example, sodium hypo chlorite will degrade from UV
exposure and elevated temperature. As it degrades it can build up sediment
in the bottom of the tank. If this sediment is periodically flushed from
the tank it will extend the life of the tank.
Installation and PIPING! - The number one reason for tank
failures is due to improper installation. It is important to follow
Snyder's "Guidelines for Use & Installation". Having
flexible connections that compensate for the expansion and contraction of
the tank will extend the life of the tank.
Is the tank used indoors or outdoors? The amount of U.V. exposure
will be based upon the time of exposure and the closeness of the
installation to the sun (elevation). What part of the country are you
in? Tanks used outdoors in states subjected to more intense sunshine will
be more affected by the sun. UV rays will have a detrimental effect on the
life span of all poly tanks.
Storage or process - Is the tank a holding tank or a processing
tank? A tank that is continuously cycled will see more stress then a tank
that remains at one level or close to one level for extended periods of
time. Tanks with excessive agitation may also be exposed to undo stress.
Stationary tanks will also not see the stress of a tank that is being
transported.
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16. Will freezing
temperatures hurt my poly tank?
Freezing temperatures will not have an affect on a polyethylene tank,
however, if there is liquid in the tank, make sure the freezing liquid has
enough head room to expand.
Snyder utilizes a test called "Low Temperature Impact Resistance". This
is a test utilized by both the ARM (Association of Rotational Molders) and
ASTM D 1998. Snyder has testing capabilities that exceed the requirements
of ARM and ASTM D 1998. They call out -20 degrees F for the test,
but Snyder has conducted testing at -40 degrees F. This test is
critical to determine if the resin has been properly processed and it will
give you an idea as to the temperatures that the resins can see. It
is important that efforts be made to avoid impacting the tank, especially
with sharp items, at any temperature.
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17. Is there some way to tell when
my tank was made?
Snyder tanks are produced with a molded-in serial number (wheel-date/month
format). In addition, the tank's bar code label has a 10-digit serial
number and date of manufacture. Your Snyder Sales or Customer Service
person, can help you interpret the date of manufacture.
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Frequently
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