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Figure 5.1 – Typical AirPrep Dryer System
7.3
AirPrep System Shutdown
7.3.1 Close the aftercooler motor air supply valve (#21). On electric units press the “Stop”
button on the motor starter control box to end cooling fan operation.
7.3.2 Close all the AirPrep System air outlet ball valves (see Figure 6.2).
7.3.3 Turn of the air compressor and/or close the compressor’s outlet valve (see Figure 6.2).
7.3.4 Open drain valve (#7) on the pre-filter (#4) and after-filter (#5), and petcock valve (#22)
(units with air motor) to drain moisture and clean out dirt particles.
7.3.5
Completely depressurize the AirPrep System separator tank (#20) by slowly opening the
drain/blowdown ball valve (#19). See Section 6.2 for blowdown procedure.
Airborne particles and loud noise hazard from the blowdown exhaust air can cause
serious injury and loss of hearing. Wear approved eye and ear protection. Stay clear of
blowdown air path. DO NOT place hands or other body parts in the blowdown air path.
Make sure no personnel are in the blowdown air path.
7.3.6 Close drain valves (#7), (#22), and petcock valve (#19).