Moyno pump

Ethylene glycol mononitrate was in use in Canada and an accident occurred in Belocil in 1975 86 J. As glycol mononitrate was considered to be safe to handle no special precautions were taken and it was pumped with two Moyno pumps. The detonation which destroyed the factory probably started through friction in a pump. 

Rotary screw pumps (Progressing cavity pump moyno pump) for shear sensitive slurries particle diameter < 5 cm., temperature < 80 °C fluid viscosity, usually above 10 Pa.s head 0.2 to 300 m < 125 L/s self priming minimum foaming pulsation-free flow. Tends to be a constant volume device. 

Rotary screw (moyno) pumps shear typically 50-70 s" /100 rpm. For highly abrasive (plaster grout, emery dust slurries keep average velocity 1-1.5 m/s mediumly abrasive (clay slurry, sludges) average velocity 1.8-3 m/s lightly abrasive 3-4.5 m/s. Reduce rpm as capacity increases use 1200 rpm for < 0.8 L/rev (15 L/s) < 300 rpm for > 10 L/rev (50 L/s). 

Rotary screw (moyno) pumps Stator has one more lobe/screw than the rotor reduce rpm for abrasives starting torque = 4 X initial torque. If particles are present, try to minimize the abrasion by using viscosity > 5000 mPa.s. Backflow or slip is reduced as viscosity increases. NPSH problems are usually not important except for suction lift, pumping from a vacuum and fluid vapor pressures of > 15 kPa. 

The fines preparation system resulting in clean fines is shown in Figure 3.2. Once produced, the filtercake was transported to the Seward site and reformulated into the desired slurry defined in Table 3.10, and shown in Figure 3.3. The slurry was then fired in the boiler as is also shown in Figure 3.3. A moyno pump was used to transport the CWS. 

FIG. 10-56 Single- rotor screw pump with an elastomeric lining. CouHesy of Moyno Tump Division, Rohhins [Pg.912]

The down-comer from the gas/liquid separator that collects the liquid slurry product is connected to the suction side of a moyno-type (Liberty progressive cavity) pump. The pump discharge is connected to a primary separation device (an inertial separator similar to a hydrocyclone). Since the slurry pump is a positive displacement device (i.e., no slurry slippage inside the pump), the total flow... 

In recent years, the addition of tallow has moved directly to dairy and beef feed lots. Small, heated, insulated tanks have been developed to receive and hold fat shipments (Figure 7). As described earlier, beef tallow is the most compatible fat for ruminants. It may be sprayed or flowed, at 2-3% of dry matter onto rations of chopped hay, other roughages, grains, or concentrates while in the mixer, or top-dressed on hay or other forages. Feed mixing operations like these require a positive displacement pump, like a Moyno or gear pump with variable-speed drive set to deliver a known amount of fat within a specific time period. As an alternative, mixers in feed mills can be mounted on load cells and equipped with controllers to stop the flow of fat when the desired weight has been added. 

This particular fermentation is performed in 1+00 liter batches. Tangential flow filtration was carried out with a Pe licon cassette (Millipore Corp.). The filtration area was 25 ft using a 100,000 molecular weight cut off ultrafiltration membrane. The inlet pressure was maintained at 1+0 psig while the outlet pressure was 25 psig and recirculation rates of the cell suspension were 3 5 GPM tangential to the upstream membrane surface. Pumping of the cell suspension was performed with a Moyno screw pump. 

Pumps, rotary screw moyno cast iron with pump, base plate, V-belt drive but excluding motor. FOB cost 10000 at flow rate = 5.5 L/s with n = 0.5 for the range 1-5.5 and n = 0.6 for the range 5.5-25. L+M = 1.6-2.2. L/M = 0.15. Factor without motor, X 1.00 with TEFC motor, X 1.2. 

Figure 2-2. Various process pumps, (a) Centrifugal (b) gear (c) Moyno. (1, 2).

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