Plastic Laminate: Polyester resin reinforced with fiberglass
Tensile strength at break: 15,000 PSI min, ASTM D638*
Flexural strength: 25,000 PSI min, ASTM D790*
Tangent modulus of
elasticity: 1,000,000 PSI min, ASTM D790*
Glass Content: 30% minimum
All Surfaces: Sealed with 15 mils of smooth white gel coat
Wall Thickness: 1/4"
*1/4" flat bar stock
Low Flow flumes are designed for use in round pipes flowing partly full and at low velocities. Typical applications are in sewer lines and storm drains where the expected flows are below the ideal flow range for standard Palmer Bowlus flumes. The insert style is intended for use in existing manhole inverts. The flume size matches the pipe diameter. Standard approach conditions call for uniform straight pipe extending 25 pipe diameters upstream of the flume. The flume's sill should be installed level in the invert and at the proper elevation for the flume (see drawing).
The flume may need to be trimmed slightly to allow for imperfections in the channel. This can be accomplished with a rasp or grinder. Check the fit of the flume prior to mixing the grout. Excellent results have been obtained using autobody filler such as "Bondo" as a grout. Epoxy resins also work well. The channel must be clean and dry to allow the grout to set properly. Clean up all excess grout with a scraper. Allow at least one-half pipe diameter upstream of the flume for taking flow measurements.
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