** A 3-IN-1 PUMP ** Toyo Pumps North America is selling a new pump that incorporates a diaphragm, hose and piston or plunger. Unlike conventional piston/plunger pumps, where pumping product enters the pump cylinder, the hose/diaphragm/piston system pumps product through a hose that passes through the diaphragm chamber. Because the product, or slurry, is contained within the hose, the diaphragm does not come into contact with the product fluid. In this way, the diaphragm is not in direct contact with contaminants. The diaphragm’s basic function is to separate the two hydraulic fluids. Toyo notes that the major cause of diaphragm failure is the grinding action between the abrasive/corrosive particles deposited on the surface of the diaphragm and the diaphragm ring. Toyo points out that other advantages of its Hose-Diaphragm High-Pressure Slurry/Chemical Piston Pump include the following: * Because the hose volume is about three times greater than liquid volume displaced by the diaphragm, the hose is practically stationary at its extremities. This gentle pumping action significantly reduces hose damage from abrasive/corrosive particles and promotes exceptional hose life and pump reliability.
* If the hose ruptures, the pump will continue to operate normally without shutdown for weeks until a suitable time is allocated for hose replacement. (A conventional diaphragm pump would stop operating altogether.)
* Should the hose rupture, all abrasive/corrosive fluid particles are confined inside the second chamber. This protects the complete hydraulic system (including piston and gearbox) against slurry contamination. Hose replacement and second chamber clean-out take about 30 min.
The primary drive to the pump is usually an electric motor mounted on the pump baseplate connected by V-belts to the totally enclosed gearbox, which forms an integral part of the pump. The output from the gearbox crankshaft moves a reciprocating piston located in an oil-filled cylinder housing. Movement of the reciprocating piston displaces hydraulic fluid, which causes a diaphragm to deflect by an equal volume, thereby transmitting hydraulic pressure into a second chamber filled with a fluid (normally clean water). Attached by its ends and passing through the second chamber is a hose. The volume of the hose is about three times greater than the liquid displaced by the piston, so that the hose is compressed by about 30% of its capacity by the tansfer of hydraulic pressure into the second chamber via the diaphragm. This allows an unrestricted passage through the hose even in its compressed state. The product (slurry) being pumped is confined inside the hose and does not come into contact with any moving parts. Product contained within the hose will be forced out through the discharge non-return ball valve. On the reverse stroke of the piston, the hose moves into its original position, thus vacuum is produced and the product is induced into the hose through the suction non-return ball valve. In this way, the diaphragm squeezes and releases the hose with each stroke of the piston.
The hose chamber itself is conveniently fitted with sight glasses, through which hose or diaphragm operation can be observed to detect failure or imminent failure. Electronic sensors can also be installed to warn automatically of hose or diaphragm breakdown. When pumping high- pressure corrosive or abrasive fluids and slurries, it can be a problem incorporating pressure relief valves that remain functional and release excess pressure without spillage or harm to the environment. An adjustable pressure relief valve within the pump’s hydraulic oil system automatically discharges oil pressure into the pump’s oil reservoir. For example, if the discharge pipeline becomes completely plugged, the increase in pipeline pressure will be transmitted back into the pump and automatically activate the hydraulic relief valve, thereby protecting pipeline and downstream components against excessive pressure. The hydraulic pressure relief valve is normally set at the working pipeline pressure.
To protect the diaphragm from excessive vacuum pressure (and possible damage) caused by the piston moving backwards with insufficient hydraulic fluid, a valve activates, automatically replenishing fluids. In case of excess pressure, the control disc completely seals the hydraulic chamber so that the diaphragm cannot expand beyond its elasticity. This arrangemen t gives 100% backing support to the diaphragm plus release of excess pressure and pressure equalization between the piston chamber and second chamber.
Other features include pulsation damping; soft de-stroking, where the internal pressure relief valve is designed to soft de-stroke the pump; flow adjustment while operating; and flush and drainage connections that can be installed to assist internal decontamination before servicing. Typical service life for the main wearing components is as follows: hose, more than 8,000 hr; diaphragm, more than 12,000 hr; ball valve and seats, 4,000 hr plus; pistons, 30,000 hr; and cylinders, connecting rods and so on, 50,000 hr. Important parts can be replaced within half an hour. Toyo says its Hose-Diaphragm High-Pressure Slurry/Chemical Piston Pump can be used for mine dewatering and mine tailings disposal. The standard unit flow range is 0 to 400 US gallons per minute at pressures of up to 2,500 psi. Custom-designed units are available for higher flows and pressures.
Aquanetics Inc. of Farmingdale, N.Y., has introduced two new mobile, handtruck-mounted oil reclamation systems. The Aquanetics PHORS 500B and PHORS 700B handtruck units purify used industrial oils to cleaner, drier levels than those normally found in new oil, allowing expensive, high-grade oil to be reused over and over again. The mobile PHORS reclaimer recovers mineral- based or synthetic oils for continuous reuse at a total process cost of 20 cents to 30 cents per gallon. Plants using the portable reclaimer, which can process virtually any industrial oil, save 90% on the purchase cost of new oil, the company says.
The air-cooled unit wheels easily to any location and connects directly to hydraulic systems, turbine lube oil systems, injection molding machines and other machinery. Contaminants removed include free and dissolved water and solvents, gases, dust, scale, rust, metal chips, soot and bacteria. Particulate contamination levels are reduced to a low of ISO contamination code 14/11, or 35 particulates per ml larger than 10 microns. rgin
Chemplex Industries Ltd. is the distributor for a new all-plastic channel frame pipe support system manufactured by Aikinstrut Inc. This alternative to metallic designs, as it’s described by Chemplex, combines thermoset and thermoplastics to provde a totally corrosion-resistant channel framing design.
Systems include a variety of channel sizes in thermoplastics and fibreglass, and also channel fittings, threaded rod, pipe straps, clevis hangers and installation hardware. Fleet Maintenance
Tandem Engineering and Management Consultants of Ottawa has been awarded the Canadian marketing rights to the Vehicle Maintenance Reporting System developed by Computerized Fleet Analysis (CFA) of Chicago. This software is well proven with more than 500 installations in use by both U.S. and Canadian fleets. The software package has been developed based on CFA’s 14 years of experience in providing a computerized fleet cost control service bureau for commercial and government clients.
The programs run on IBM-compatible micro-computers, and the Canadian packages have fluids and distances in metric measurements. A French version will be available later this year. The software is divided into a phase that provides fleet maintenance cost reporting, while a second phase controls and reports on parts use and inventory control. Machine Fault Analysis Bruel & Kjaer Canada has introduced a powerful software package that can anlayze non-stationary signals through the us e of a waterfall display program. Applications of the software package WT9121 include machine runups and coastdowns, reciprocating machine analyses and order tracking on machines running at variable speeds. It is designed for use with Bruel & Kjaer dual channel signal anlayzers Types 2032 and 2034.
A wide range of display options are provided. Measurements can be presented as three-dimensional plots of up to 100 spectra, as Campbell diagrams, as maximum value at each frequency or as a plot of the total RMS level of all spectra in the 3-D plot. — 30 —
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