Fire Code of the Philippines Ebook - SafetySignsPH.com Fire Code of the Philippines eBook - SafetySignsPH | Page 275

c. For underground tanks:
i.
Underground tank storage for Class I, Class II or Class III liquids
shall be covered with a minimum of sixty centimeters (60 cm)
earth or shall be covered with not less than thirty centimeters
(30 cm) of earth on top of which shall be placed a slab of
reinforced concrete not less than ten centimeters (10 cm) in
thickness;
ii. Tanks subjected to traffic shall be protected against damage
from vehicles passing over them by at least ninety centimeters
(90 cm) of earth cover or fifty centimeters (50 cm) of well
tamped earth, and topped with 5 centimeters (5 cm) of
concrete or twenty centimeters (20 cm)
of asphalted
concrete;
iii. Asphalted or reinforced pavement used as part of the
protection of the tank shall be extended at least thirty
centimeters (30 cm) horizontally beyond the outline of the tank
in all directions;
iv. Where tank may become buoyant due to rise in the level of
water table or due to location in area that may be subjected
to flooding, suitable precautions shall be observed to anchor
the tank in place.
d. Piping systems:
i.
The design, fabrication, assembly, test, and inspection of piping
systems containing flammable and combustible liquids shall be
suitable for the expected working pressures and structural
stresses in conformity with the internationally accepted
standards.
ii. Joints shall be made liquid-tight and shall be either welded,
flanged, or threaded, except that listed flexible connectors
shall be permitted to be used where installed.
iii. Threaded joints shall be made up tight with a suitable thread
sealant or lubricant. Joints in piping systems handling Class I
liquids shall be welded when located in concealed spaces
within buildings.
iv. Pipe joints, dependent upon the friction characteristics or
resiliency of combustible materials for mechanical continuity or
liquid-tightness of piping, shall not be used inside buildings.
They shall be permitted to be used outside of buildings
aboveground or underground. If used aboveground or outside
of buildings, the piping shall either be secured to prevent
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