From Philadelphia, Serving the World With Polyethylene tanks SIERRA 215-258-5602

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Sierra Sales - From Philadelphia, serving the world of PE TANKS

Rotationally Molded Polyethylene Tanks Offer These Advantages:

Difference in resin. The advantages our HDLPE resin has over other rotomolded linear resins in tank applications? Over XLPE?
1. Over Linear, Medium and Low Density Polyethylene:
superior impact and stress-crack resistance

  • Improved weatherability
  • Broader chemical resistance
  • Lower notch sensitivity

2. Crosslink versus Linear:
"The most important advantage that crosslinkable polyethylene (XLPE) tanks have over linear polyethylene (LLDPE) tanks is that XLPE has a much higher molecular weight than LLDPE. In general, as the molecular weight of polyethylene increases, the environmental stress cracking resistance (ESCR), part impact strength, elongation, weathering, toughness, and tensile at elevated temperatures are improved."

This in fact is a true statement; however Snyder is using a TRUE HDLPE and not a LLDPE. In fact, during the molding cycle the density of resins changes and testing has shown us that we end up with a higher density with our HDLPE than with the CL200 XLPE.

We feel very confident that our studies and case histories can help us to determine the best resin for the application. Sii has always taken pride in our ability to get the full development of the physical properties of the resins which translate into chemical resistance and tank life.

Crosslinked vs. linear Advantages:
The most important advantage that crosslinkable polyethylene (XLPE) tanks have over linear polyethylene (LLDPE) tanks is that XLPE has a much higher molecular weight than LLDPE. IN GENERAL, as the molecular weight of polyethylene increases, the environmental stress cracking resistance (ESCR), part impact strength, elongation, weathering, toughness, and tensile at elevated temperatures are improved.
Wall thickness is not the only factor relevant to determining the strength of the tank. Proper material cure is more important than wall thickness in determining tank strength. Material cure is highly dependent upon the time of exposure to heat conducting through the tooling and the plastic material. Excessive exposure to high temperature will degrade the plastic material and cause a weak part. The ideal cure cycle is to reach the proper curing temperature as fast as possible, maintain that temperature for the correct period of time, and to cool the part and tooling at the proper rate of part temperature decrease. The superior Sii manufacturing process and oven capacity makes it possible to reach the proper cure temperature quickly and avoid the material degradation caused by slow oven temperature rise. Therefore, it is improper manufacturing technique to compensate for poor material cure with excessively thick tank walls.

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Click Here to Read about our poly containment basins and polyethylene double wall, covered containment, tanks

The following chart will give you another comparison of XLPE and HDLPE that has been developed by Exxon:

 

 

                               ADVANTAGES

Product Attributes

HDLPE 

XLPE

ARM RT Impact Strength

X

ARM-40 Impact Strength

X

Stiffness (Flexural Modulus)

X

X

Creep Resistance

X

Tensile Break Stress

X

Tensile Break Elongation

X

Heat Distortion Temp.

 

Stress Crack Resistance

 

Color

X

X

For Tank Standards Click Here

Quality, Service, Delivery, and Pricing. Sierra Sales will relate an "understanding" to your process personnel and, if required, invite you to meet with the various manufacturers Sierra Sales represents. We work with the manufacturers to give you exactly what your process requires. Polyethylene horizontal tanks, poly cone bottom tanks, plastic ibcs, all plastic horizontal ibcs, polyethylene chemical processing tanks, industrial strength bleach tanks, wastewater, and chemical bulk storage tanks. Read about all the plastic rotomolded poly tank materials.

Given the opportunity to quote engineering process supplies for your project, or day to day maintenance, Sierra Sales can walk you through selection right up to delivery of your vessels, piping, valves, and jacketing. If required, Sierra Sales's line of IBC's can move your finished product over the highways. Sierra Sales's totes and plastic IBCs are UN Tagged. Ready to go! Including the worlds' largest all plastic horizontal IBCs, Snyder's Megatainer

Download the Sierra Sales Specification for Polyethylene Upright Storage Tanks by Clicking here.

Browse our site, see the quality of the products, compare our services, then feel free to call or contact us. Contact Sierra Sales's competition. Compare the quality of our products. It is easy to see when selecting poly tanks or all plastic IBCs why

SIERRA SALES
215-258-5602
Fax 215-258-5606

corrosion and Chemical Resistant Polyethylene and  Fiberglass Tanks

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Look around our web site. Then call us.Providing a solution for your bulk storage requirement is easy if our sales staff know a few things. Don't know what you need? We will discuss it with you.We have the right poly tanks for your needs.

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We answer our phones, we return phone calls, faxes, and emails, and we are the fastest trained responders in the industry! Try us, compare us, dare us, to deliver when the traditional tank suppliers take your orders and put them on the PILE!

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