21 JANUARY 2003
4.4.7. Remote Controls (Electrical):
18.104.22.168. Fixed Control Stations. The original joy-cable fixed control stations on Type I hydrant
systems should have been converted to the magnetic control switches similar to the KISS switches
used in the Type II system.
22.214.171.124. Emergency Switches. Emergency switches are single-pole-type and connected in series
with the power supply line to the control equipment in the operating pumphouse. The switches are
provided so operating personnel at any pit can stop all fueling operations in case of fire or other
mishap. After activation of an emergency switch, the controls in the operating pumphouses must
be manually reset to resume fueling.
4.4.8. Defueling Tank. A deep-well turbine pump is installed on the defueling tank to transfer the
product to bulk storage or operating tanks. The defueling tank should be equipped with a high-level
alarm to warn personnel that the fuel level in the tank is approaching the predetermined fill level, and
a high-level control valve to shut off the flow of fuel into the tank.
4.4.9. Liquid Level Gauge and Low-Level Control. A liquid level gauge and low-level control
(Figure 4.6) are installed to shut down the pump automatically. The liquid level gauge and the low-
level control prevents withdrawing fuel from the tank below a predetermined level (typically
330 millimeters [13 inches] on underground tanks), and prevents the pump from running dry.
Figure 4.6. Liquid Level Gauge (Liquidometer).