This specification document is
being developed by the PVC Geomembrane Institute (PGI) to help designers,
engineers and regulators properly specify PVC liners. This document outlines the
current industry methods for manufacturing, fabricating and installing PVC
geomembranes. The following guidelines are in accordance with the best
practices used at this time but are by no means the only way to fabricate and
install PVC. Any deviations should be agreed upon in advance by all parties.
The PVC Geomembrane Institute is
dedicated to conducting research and educating engineers and specifiers about
the properties and use of PVC geomembranes. PGI conducts ongoing research in
order to further the knowledge base of PVC geomembranes.
In most
cases test methods do not specify testing frequencies. This appendix outlines
the frequency of tests required to fulfill this specification for manufacture,
fabrication, and installation frequencies.
MANUFACTURING TESTING FREQUENCIES
Certified
properties are tested based on a quantity of material produced. Certified
properties are tested once per lot, or once every 40,000 lbs of material
(18,000 kg), whichever is more frequent. The certification properties include
thickness, tensile break strength, elongation at break, modulus at 100% strain,
tear resistance, dimensional stability, and low temperature impact. Thickness
is to be tested once per roll unless automatic thickness measuring equipment is
installed on the production equipment. Certified test reports (Mill
Certificates) for the tested properties are to be provided with every order on
request.
Index
tests are performed when preparing and approving a geomembrane formulation. The
tests are performed on the final production formulation of a geomembrane. The index properties include specific
gravity, water extraction, volatile loss, hydrostatic resistance, and soil
burial resistance. A certified
statement of the test results for the formulation is to be made available to
the customer on request.