d) Valved sample connections in the shell, having
nonfreezing-type valves in cold climates, every 2 feet (0.6 m)
vertically, easily accessible from the ladder or stairway.
e) When chemical feed is provided, a chemical feed
inlet valve, to be nonfreezing type in cold climates.
f) When air blowing is provided, a perforated pipe
air sparger for mixing. Make the perforations in the sides of
the pipe to avoid plugging by settling solids. Use
nonfreezing-type air inlet valve(s) in cold climates.
g) Sight glass or look box on oil outlet line.
h) Sight glass or look box on water outlet line.
i) Oil sump tank with high-level alarm.
j) Water and oil pumps as required to move fluids
from receiving tanks or from oil sump tanks. For transfer of
oily water, use low-speed-type pumps to minimize
k) If heaters are required to reduce oil viscosity
and promote separation, use either tank wall heaters or
internal pipes. Keep internal pipes at least 2 feet (0.6 m)
above the tank floor.
l) Insulation for tanks that will be regularly
m) Provide automatic temperature controls and
thermometers for all heated tanks.
from storage or settling tanks with an API oil/water
separator. Recycle the fuel portion and pass the water
portion to another treatment process. Do not discharge water
drawn from tanks to surface water without additional treatment
and permits. Section 2 of this handbook contains design
information for an API oil/water separator.
SLUDGE REMOVAL SYSTEMS