OO-B-2925
3.10.2 Safety systems. The baghouse shall be fitted with a fire protection and a high differential pressure shutdown safety system.
3.10.2.1 Fire protection system. A thermal detector shall be provided on the outlet gas stream from each module. The detector will monitor the outlet temperature and initiate an alarm when the temperature rise indicates a fire in the module. The alarm shall trigger the module damper valves to close and remain closed until manually reset to open. The alarm signal shall be sent to the control panel.
3.10.2.2 High differential pressure system. The differential pressure across each baghouse shall be monitored and compared to a common adjustable setpoint controller. Differential pressures exceeding the setpoint value shall initiate an alarm sequence that shall bypass the module with the high differential pressure by closing the module automatic dampers. Activation of additional high differential pressure alarms causing more than 30 percent of total bag surface area to be off line shall activate the main baghouse bypass damper.
3.10.3 Hopper dump system. The hopper dump system controls shall include the controls required in 3.9.6. The control panel shall indicate the hopper material level and module damper position. Panel mounted or local instrumentation shall be used to indicate the hopper wall temperatures and the temperature set point of the heat tracing temperature controller.
3.10.4 Boiler draft system. A controller shall be furnished on the induced draft fan inlet damper to maintain the setpoint draft on the boiler flue gas outlet. The draft controller shall monitor the draft close to the boiler flue gas outlet and adjust the inlet damper accordingly to maintain the required draft. The controller shall have an adjustable setpoint. The controller shall be compatible in both type and make with the existing boiler control system.
3.10.5 Control panel. The controls for the baghouse including operating switches, indicating lights, gages, alarms, motor starters, circuit breakers, and programmable controller shall be mounted on a single control panel or cabinet insofar as practicable in order to centralize the baghouse control functions. The common alarm indicator shall consist of a panel mounted light. When specified (see 6.2), the alarm signal shall also activate an audible alarm. The control panel shall be located on the packaged assembly.
3.11 Electrical requirements. Electrical wiring design practices shall be in accordance with the applicable requirements of NFPA 70. The baghouse and associated equipment shall obtain power from a circuit with a single master manual service disconnect switch and automatic circuit breaker for all electrical equipment. Motors shall be in accordance with the provisions of NEMA MG 1, shall be totally enclosed fan cooled, and designed for operation on the voltage, phase, and frequency as specified (see 6.2). Unless otherwise specified (see 6.2), motors of 100 horsepower (74 600 W) and less shall be provided with magnetic across-the-line starter and overload protection. Motors over 100 horsepower (74 600 W) shall have reduced voltage starting. Motor starters shall conform to the applicable requirements of NEMA ICS 1 and ICS 2. Motor starters and controls shall be enclosed in NEMA ICS 6 type 12 enclosures and may be installed in the control panel of 3.10.5.
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