2020 Tech Report May-June

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

ACTION

COMMENT

NOTE: Ensure the transfer hose you assem- ble includes a purge/drain valve as shown on the Transfer Hose Diagram on Page 3 of this Maintenance Procedure. CAUTION: Do not proceed to the next step until the transfer hose is fully assembled. Select a source location that has a higher pressure than the vessel being tested. The temperature of the liquid should be equal to or colder than the vessel being tested. An ideal source location (if it is available) is in the outlet of the refrigerant pump with the same suction pressure. NOTE: Be extremely cautious when using High Pressure Liquid (HPL) to fill and test a column on a lower pressure vessel. Because of the difference in pressures and tempera- tures, this process will result in extremely vio- lent boiling of the liquid in the column as the HPL liquid is introduced. For the rest of this procedure, this valve will be referenced as the “Source Valve.”

1.

Assemble the transfer hose. Ensure hose length is appropriate. Note that a short hose may lead to an inability to make proper connections and/or stress the hose fitting. A long hose will increase pumpout time and may lead to excessive refrigerant loss.

2.

Select an appropriate liquid source.

3.

Verify the selected Source Valve is closed. If the selected Source Valve is open, close it. Remove the plug or gauge from the Source Valve.

4.

RETA TECHNICAL REPORT PAGE 6