Fire Code of the Philippines Ebook - SafetySignsPH.com Fire Code of the Philippines eBook - SafetySignsPH | Page 405

internationally accepted standards.
2. Where Class I liquids are exposed to the air, the design of equipment
and ventilation of buildings shall be such as to limit Class I liquid
locations to pits, the interior of equipment and the "immediate vicinity"
of pumps or equipment locations such as dispensing stations open
centrifuges, plate and frame filters, opened vacuum filters, change
cans, and the surfaces of open equipment. Immediate vicinity means
a zone extending from the vapor liberation point six meters (6 m)
horizontally in all directions and vertically from the floor to a level two
meters (2 m) above the highest point of vapor liberation.
3. All locations not covered by this Section where Class I liquid's are
handled shall be considered Class I, Second Division. If the flash point
of the liquid processed is higher than the ambient temperature and at
least thirty-seven and eight tenths degrees Celsius (37.8°C), ordinary
electrical equipment may be used, though care shall be used in
locating electrical apparatus to prevent hot metal from falling into
open processing equipment.
4. Ordinary electrical equipment, including switchgear is prohibited,
except if installed in a room, which is maintained under positive
pressure with respect to the hazardous area. Air or other media for
pressurization shall be taken from a location that will not cause any
amount or type of flammable vapor to be introduced into the room.
D. Protection Against Static Electricity and Lighting
1. All equipment such as tanks, machinery and piping where an ignitable
mixture may be present shall be bonded and connected to a ground.
The bond or ground, or both, shall be physically applied or shall be
inherently present by the nature of the installation. The resistance to
ground of a metallic grounding path shall not exceed 25 ohms and
the resistance to ground of a nonconductive or semi-conductive
grounding path shall not exceed 1 million ohms (1 mega ohm).
2. Electrically isolated section of metallic piping or equipment shall be
bonded to the other portions of the system or grounded.
3. Tank vehicles loaded or unloaded through open connections shall be
grounded and bonded to the receiving system.
4. When a flammable mixture is transferred from a portable container to
another, a bond shall be provided between the two containers, and
one shall be grounded.
5. Steel or metal framing of buildings shall be grounded with resistance of
not more than five (5) ohms.
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