2020 Tech Report May-June

Task # 2.a.: Performing Float Switch Testing on Vessels with Drain Valve Configurations

ACTION

COMMENT

24.

Observe the following positions of the float switch magnets in relation to the at- tractor rod inside the hermetically sealed switches: · As the level of ammonia in the float column rises, the magnet should press against the attractor rod to make the float switch’s High Level Alarm (HLA) initiate an alarm. · As the level of ammonia in the level column rises, the magnet should press against the attractor rod to make the float switch’s High Level Shut Down (HLSD) trip, shutting down the associated compressors within the engine room. · If there is a level probe present, verify the calibration of the level probe. When the liquid level is above the float switch position and the float switch has been determined to be working or in need of replacement, continue to the next step.

The High Level Alarm must activate an audible alarm inside the engine room.

All compressors attached directly to the suc- tion of the tested vessel must shutdown or alarm. If they do not, consult your supervi- sor or facility contact to determine the proper course of action.

If the test determines faulty equipment, con- sider performing level probe calibration at this time.

25.

Slowly close the Source Valve.

RETA TECHNICAL REPORT PAGE 10