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Dust Recovery Hood A new dust recovery hood for vibrating fluid bed dryers and coolers from process equipment manufacturer The Witte Co., Washington, N.J., features a proprietary design that allows on‐spec particles entrained in the airstream to be captured and gently returned into the process for recovery as finished product. Engineered with an expanding, tapered profile that reduces the airflow velocity as the process air rises, the Witte dust recovery hood cuts the volume of prod‐ uct lost as waste, boosts the ratio of fin‐ ished product at discharge per unit of input and supports dust control efforts while reducing the size of the unit re‐ quired to achieve the desired tempera‐ ture and moisture content. Undersized fine particles entrained in the airstream that need not be recovered for recycling may be collected using a dust collector. Developed for drying foods, chemicals, pharmaceuticals, aggregates, sand and other valuable products where unneces‐ sary waste is to be avoided, the Witte dust recovery hood is manufactured at the company's New Jersey headquar‐ ters. The new dust recovery hood is available on the company's entire line of vibrating fluid bed dryers and coolers and may be suitable for retrofit on Witte fluidized bed dryers and coolers in the field. Witte Co. Inc., www.witte.com Accurate Particle Measurement The Computerized Particle Analysis (CPA) System from W.S. Tyler offers more precise particle measurement be‐ yond traditional sieve analysis. Ideal for operations that perform 15‐20 or more sieves per day, CPA technology uses a digital line camera to measure particles up to 10 times faster than conventional sieve methods. With up to 20,000 scans per second, the CPA's high‐resolution line camera analyzes particles as small as 10 microns, capturing particle shape and size and recording the quantity. This eliminates manual calculations and operator error, while reducing quality assurance costs. The result is more pro‐ duction of higher dollar value material and less waste. CPA equipment is available in multiple sizes, the largest of which can accurately measure material up to 2 in. (51 mm) in diameter. Operations can use it on‐site or in traveling labs, as well as online and inline. Using an automatic belt sampler, CPA can be used online and automated to run operator‐free with scheduled or continuous sampling. One test sample takes just three to five minutes. If material is found to be out of spec, the CPA can be programmed to sound an alarm, stop the process or even change parameters on the process‐ ing equipment. Using CPA inline means analyzing 100 percent of the material stream in real time. All CPA models use Windows‐friendly software for reading, recording, calculating, analysis and dis‐ play of the sample results. W.S. Tyler, www.wstyler.ca Ventilex Fluid Bed Driers The technologically advanced fluid bed sand dryer from Ventilex USA Inc. is a boon to the hydraulic fracturing industry, according to the company. Frac sand producers now have en‐ hanced capabilities to meet the high demands for proppant. Though the number of frac sand sup‐ pliers has increased significantly in the past decade, global supplies are still inadequate. Lack of proper mate‐ rial processing and handling equip‐ ment as well as transportation challenges are some of the main rea‐ sons for the high cost and insufficient supplies. According to JPT Online (the online version of The Journal of Petroleum Technology, the official publication of The Society of Petroleum Engineers), North American fracturing activity is at an all‐time high, with competition between fracturing companies fierce, margins slim and volumes huge. With an estimated 4 million hhp of equipment being built in the U.S., there are waiting lists for services and supplies, and delays of up to 9 months are common. Fluid bed driers from Ventilex offer in‐ creased productivity of up to 200 tph for frac sand drying while providing long term durability and energy sav‐ ings to reduce operational expenses. The fluid bed driers feature: ■ Increased efficiency and output. ■ Reduced energy costs up to 30 percent. ■ Lower dust and carbon emissions. ■ Higher returns from enhanced durability and lower maintenance. Ventilex, http://ventilex.aiserver.us 22 ROCKproducts • OCTOBER 2012 www.rockproducts.com