e) Mark each tank clearly with its status. Place a
warning sign on the tank to indicate its current and former
f) If required by state or local regulatory
agencies, submit required documentation for "out-of-service"
a) Empty and evaluate for hazardous atmosphere as
defined by 29 CFR 1910.146.
b) Wash and dry tank interior until visibly clean in
accordance with API Std 2015.
c) Physically disconnect all fuel connections.
d) Treat the interiors of tanks that have been used
to store fuel oil with a corrosion-preventive compound. For
all other steel tanks, coat the unpainted interior surfaces
other tanks should remain open.
f) Partially fill tanks subjected to high winds to
prevent overturning. Use water except where there is the
possibility of it freezing and rupturing the tanks. In those
environments, use kerosene. Add caustic soda to the water to
obtain a pH of 10 or a corrosion inhibitor. Determine the
amount of liquid ballast required based on the expected winds,
size of the tank, and specific gravity of the liquid used.
g) Comply with API Std 2015.
h) Comply with state and local environmental
a) Empty, evaluate for hazardous atmosphere as
defined by 29 CFR 1910.146, and clean underground metal and