Equipment safety dryers

Eactory Mutual Engineering Corp. 1151 Boston-Providence Turnpike Norwood, Mass. 02062 Standards for safety equipment, safeguards for flammable Hquids, gases, dusts, industrial ovens, dryers, and for protection of buddings from wind and other natural ha2ards. 

Nuclear Boiler Assembly. This assembly consists of the equipment and instrumentation necessary to produce, contain, and control the steam required by the turbine-generator. The principal components of the nuclear boiler are (1) reactor vessel and internals—reactor pressure vessel, jet pumps for reactor water circulation, steam separators and dryers, and core support structure (2) reactor water recirculation system—pumps, valves, and piping used in providing and controlling core flow (3) main steam lines—main steam safety and relief valves, piping, and pipe supports from reactor pressure vessel up to and including the isolation valves outside of the primary containment barrier (4) control rod drive system—control rods, control rod drive mechanisms and hydraulic system for insertion and withdrawal of the control rods and (5) nuclear fuel and in-core instrumentation,... 

These creative individuals had set up a scheme to purge through the top of the air dryer and out of a partially opened ball valve on the lower piping. They, no doubt, failed to realize that the dryers were not individually equipped with safety relief valves. The overpressure protection was on the compressors. A new operator to the area did not open the exit valve sufficiently during the cool-down step. 

Fire and explosion hazard in dryers imposes extra requirements on plant maintenance. It is important to apply the general policy in a breakdown case or prevention measures as well as routine maintenance and turnaround periods. Special attention should be paid to maintenance in all safety systans and in that equipment responsible for the ignition sources. A work permit should be followed in all maintenance work, especially performing hot work like welding, cutting, or soldering. 

The equipment used in the industrial production is quite conventional, including stirred precipitation tanks, filters, extruders, concrete mills, spray, belt and rotary dryers, rotary Idlns, and so on. The modernization of the industrial plants has been driven by the need to increase the production capacities (debottlenecking) and to commercialize new generations of catalysts as well as by health, safety, and environmental issues. 

The rotary conical dryer blends as well as dries. Certain safety requirements apply especially with this type of drying equipment, such as ... 

What At the least, inspect the mechanical and safety control equipment associated with dryers, grain stream processing equipment, dust collection equipment (including filter collectors), and bucket elevators to ensure it is in safe working condition. 

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