Asphalt Pro - June/July 2012

Page 24

Left and Below: Clarence Richard suggests producers place a strip of conveyor belt or similar material alongside the EZ-Flo scale to prevent wind from affecting its delicate operation. Of course, you’ll want to add that encumbrance after you get the scale into this tight space. Photos courtesy of Clarence Richard Co.

Below: Henningsen Plants Superintendent A.J. Dennis Campbell points out the installation of the EZ-Flo scale. Photo courtesy of Clarence Richard Co.

with RAP in one of the bins and RAS in another,” Richard continued. “They can’t be sure how much is coming out of either bin at any given time. The RAP conveyor was built for heavier TPH flow rates (25 to 125 TPH) of RAP productions. Current RAS rates require weighing product from 5 to 25 TPH. That’s a big difference. The RAP scale system (conveyor included) was not built to accurately weigh material at such a low flow rate. 24 June/july 2012

“Third, when you have multiple bins in series with a RAP scale system, there’s no way for the blending control to adjust for bin speed when one of the RAP bins or RAS bin clogs up, or density is changed. And density can change plus or minus 15 percent. Some belt scale manufacturers advise against using their scale to weigh light-loaded products for such a critical application.” To address weighing RAS separately, Richard brought up the


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