c) For concrete-encased tanks, with exterior steel
containment, consider exterior fiberglass cladding for
extremely corrosive atmospheres or seaside locations.
Fill Piping. Size the pipe so that the velocity
does not exceed 12 feet (3.7 m) per second at maximum flow
rate. Provide a means for reducing the velocity of flow to 3
feet (0.9 m) per second until the filling inlet nozzle is
completely submerged and/or the floating pan has lifted off
its legs. This may be done by a properly sized diffuser
within the tank.
Vapor Emission Control Systems. Provide a vapor
true vapor pressure of 0.75 psia (5 kPa) or more and located
petroleum vapors is controlled or prohibited. Ensure that the
system has sufficient capacity to control the vapor discharged
from the tank vents at maximum filling rate in conformance
with local air quality regulations. At a minimum, provide
Stage I with piping for Stage II for all horizontal tanks
storing gasoline. If required by local or state regulations,
provide a complete Stage II system. If not required at time
of construction, connect the Stage II piping to the tank and
cap it at the dispenser.
Strapping Tables. Provide API MPMS 2 certified
strapping tables for all tanks. Use 1/8-inch (2 mm)
increments reading in gallons (litres). Provide electronic
media data files. Determine strapping table volumes using
physical measurements, not calculated values.
Product Recovery Systems. Provide pumps, piping,
valves, and tanks to collect and store usable aviation turbine
fuel which would otherwise become waste from operational or
maintenance activities. Include a tank(s) to collect
fuel/water mixtures from tank and equipment sumps, equipment
drains, product saver tanks, high point vents, low point
drains, and any other equipment from which fuel/water mixtures
can be collected. Separate the fuel and water portions.
Filter the fuel portion and return to bulk storage tanks. Do
not discharge the water portion to surface water without
additional treatment and permits or treat the water portion as
wastewater. Refer to Section 2 of this handbook for
information on handling of wastewater. Refer to Standard