Pneumatic Dust Control in Grain Elevators Guidelines for Design Operation and Maintenance (1982) / Chapter Skim
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Instrumentation, Operation, and Maintenance
Instrumentation, Operation, and Maintenance
Pages 79-88
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From page 79... ...
Ins trumentation Various instruments and associated hardware are available for monitoring and controlling dust-collection systems. Besides contributing to efficient operation, this equipment warns of potentially hazardous breakdowns.
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From page 80... ...
A level indicator is used to detect plugging of a filter hopper with dust. One type of level indicator is a rotating paddle wheel driven by a torque motor through a friction clutch.
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Electrical Interlock Besides being equipped with basic monitoring and control equipment, the moving components of a dust-collection system should be electrically interlocked. The interlock should be arranged so that shutdown of any component will shut down the system.
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It is useful to mark (red-line) the face of the gauge to show the lower and upper pressure limits for acceptable operation.
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When filter pressure falls below the lower limit, the system, again, should be checked for malfunction. The most likely problems are broken filter bags, a partially plugged main duct, closed blast gates in branch ducts, or slipping belts on the system's exhaust fan.
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From page 84... ...
The pitot tube is a combination of two tubes, as shown. The leading tube measures total pressure in the duct, and the trailing tube measures static pressure.
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From page 85... ...
The pitot tube, an instrument for measuring velocity pressure, consists of two tubes joined together as shown. Special pitot tubes are required for measuring air flow in a pipe containing dust.
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Table 8-1 shows a sample trouble shooting guide. Sample Maintenance Schedule Daily 1.
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From page 87... ...
Main airflow damper open too far Rotary-valve gearmotor overloads Obstruction in valve
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