2020 Tech Report May-June

Task # 2.b.: Performing Float Switch Testing on Liquid Make-Up Systems With- out a Drain Valve

ACTION

COMMENT

11.

· Carefully restart the smallest com- pressor that takes suction from the target vessel. · Set the slide valve (Capacity Con- trol) to the minimum position. This should read 10% or below. · Close the suction valve on the com- pressor. · Crack the suction valve open ap- proximately 1/8 of a turn. Monitor the suction pressure shown on the compressor suction gauge. Aim to keep the compressor running, but at the lowest possible pressure above the low-pressure cutout. · Monitor the suction temperature. It should stay about 15 to 20 degrees above the equivalent saturated suction pressure / temperature. · Check ammonia level in level col- umn. When the level in the vessel is below the High Level Shutdown level, slowly open the suction on the compressor. Continue to monitor the suction tempera- ture. It should be at least 3 to 5 degrees above the equivalent saturated suction pressure / temperature.

CAUTION: Monitor the compressor discharge temperature. In the event of a rapid drop in discharge temperature, initiate an emergency stop immediately.

RETA TECHNICAL REPORT PAGE 17