Design Manual - International Wastewater Technologies
Design Manual - International Wastewater Technologies
Design Manual - International Wastewater Technologies
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3.0 Structural Capabilities<br />
3.4 INJECTION MOLDING<br />
To comply with both the structural requirements of<br />
AASHTO’s LRFD design and analysis methods and<br />
product requirements of ASTM F2418 “Standard Specifi -<br />
cation for Polypropylene Corrugated Wall Stormwater<br />
Collection Chambers,” StormTech utilizes proprietary<br />
injection molding equipment to manufacture the SC-740<br />
and SC-310 chambers and end caps.<br />
In addition to meeting structural goals, injection molding<br />
allows StormTech to design added features and advantages<br />
into StormTech’s parts including:<br />
• Precise control of wall thickness throughout parts<br />
• Precise fit of joints and end caps<br />
• Molded-in inspection port fitting<br />
• Molded-in handles on end caps<br />
• Molded-in pipe guides with blade starter slots<br />
• Repeatability for Quality Control (See Section 3.6)<br />
Product Specifications: 2.1, 3.1 and 3.3<br />
3.5 POLYPROPYLENE RESIN<br />
StormTech chambers are injection molded from poly -<br />
pro pylene. Polypropylene chambers are inherently<br />
resistant to chemicals typically found in stormwater<br />
run-off. StormTech chambers maintain a greater portion<br />
of their structural stiffness through higher installation<br />
and service temperatures.<br />
StormTech polypropylene is a virgin material specially<br />
designed to achieve a high 50-year creep modulus that<br />
is necessary to provide a sound long-term structural<br />
design. Since the modulus remains high well beyond<br />
the 50-year value, StormTech chambers can exhibit a<br />
service life in excess of 50 years.<br />
3.6 QUALITY CONTROL<br />
StormTech SC-740 and SC-310 stormwater chambers<br />
are manufactured under tight quality control programs.<br />
Materials are routinely tested in an environmentally controlled<br />
lab that is verified every six months via the external<br />
ASTM Proficiency Testing Program. The chamber material<br />
properties are measured and controlled with procedures<br />
following ISO 9001:2000 requirements.<br />
Statistical Process Control (SPC) techniques are applied<br />
during manufacturing. Established upper and lower<br />
control limits are maintained on key manufacturing para -<br />
meters to maintain consistent product.<br />
Product Specifications: 2.13 and 3.6<br />
Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 7