21 JANUARY 2003
6.3. Receiving and Storage.
6.3.1. Receiving Equipment. Typically, fuel is received at the base fuel storage area then delivered
to the Type III system by pipeline (Figure 6.1). Fuel enters the system through a 40-mesh strainer
upstream of the receipt F/S. This strainer is equipped with a piston-type DP gauge and a bottom drain
piped into a product recovery tank. The maximum allowable DP across the strainer is 10 pounds per
square inch differential. At 10 pounds per square inch differential, the operator must open and clean
the strainer. Once the fuel passes through the strainer, it moves through the receipt F/S or bypass
valve (BPV). The F/Ss are piped in parallel with a BPV and manifolded together. The receipt F/S is
an API 1581, Group II, Class B, and rated at 2271 liters per minute (600 gallons per minute) each.
The FSCV will close and the BPV will open automatically when the separator DP reaches 15 pounds
per square inch differential. After flowing through the receipt F/Ss or the BPV, fuel passes through
the 4542.4-liter-per-minute (1200-gallon-per-minute) meter, and then through the HLSO valve into
the operating storage tanks.
6.3.2. Storage Tanks. (See Figure 6.1.) Operating storage tanks have a cone roof, aluminum
honeycomb floating pan, and a 5% sloped floor to a center sump. These tanks are fully coated inside.
Existing storage tanks may be used as operating tanks when the distance from the Type III fueling
apron to the tanks is less than 1.6 kilometers and they are upgraded to the latest design standards for
operating storage tanks. New tanks must be constructed when the distance exceeds 1.6 kilometers.
Provide two tanks for each hydrant fueling system. Operating tanks typically have a capacity of 2500
barrels, 5000 barrels, or 10,000 barrels. Overseas, operating tanks are typically cut-and-cover tanks
(field-constructed underground storage tanks).
18.104.22.168. High-Level Alarm (HLA). (See Figure 6.1.) An HLA is installed on each tank to show
when the tank is full and further filling should stop. It is set to alarm just before the HLSO valve
closes to stop flow into the tank. When actuated, the HLA window on the pump control panel
(PCP) flashes and a vibrating alarm sounds. After the operator acknowledges the alarm, the audio
alarm stops and the visual warning becomes steady. Once the fuel level drops below the HLA
setting, the visual warning deactivates.
22.214.171.124. HLSO Valve (413AF-5A). Each operating storage tank is equipped with a HLSO valve on
the fuel inlet line and a float assembly at the tank high-level shut-off point (Figures 6.1 and 6.2).
When the tank fuel level reaches the float assembly, located on the side of the tank, the float
assembly directs fuel to the HLSO valve control loop, causing the HLSO valve to close and stop
the flow of fuel into the tank. The HLSO valve is equipped with a check feature to prevent reverse
flow. The float assembly also has a manual tester so the rotary disc assembly and the HLSO
valve-closing feature can be checked without filling the tank with fuel. Some HLSO valves have a
closing speed adjustment.