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In many cases a tank, dike area, or lagoon has valves that must be
opened and closed to add or remove material. Precautions must
be taken to prevent the material from leaking and contaminating
the surrounding area when the valves are operated. Valves like
this are comparatively intricate in shape and field fabrication
is often necessary, so the protective membrane must be specified
for flexibility as well as chemical resistance and toughness.
Materials such as HDPE which derives its strength only from thickness are
often too stiff for fabrication to the net shape required, and
subject to fatigue caused by the flexing motion of frequent
opening and closing. On the other hand, PetroGard derives its
strength from its polyester base fabric, so a PetroGard product
with certain tensile, puncture, and tear specs is much thinner,
lighter, and more flexible then HDPE with the same properties.
See comparison chart.
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