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Isophthalic resin reinforced with fiberglass | |
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17,000 PSI min, ASTM D638 | |
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30,000 PSI min, ASTM D790 | |
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12,000,000 PSI min, ASTM D790 | |
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30% minimum | |
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Sealed with 15 mils of smooth white gel coat | |
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Fiberglass | |
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Same as flume | |
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Type 304 Stainless Steel | |
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White with black markings; graduated in feet and tenths of feet. Integrally molded in flume wall. | |
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Standard ¼" nominal, 3/8" for large flume wall surface. |
Flumes shall be supplied with integral Foam Reinforcing Ribs and Top Stiffener Angles as required by Flume size.
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.
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 auto body filler such as "Bondo" as 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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