Fire Code of the Philippines Ebook - SafetySignsPH.com Fire Code of the Philippines eBook - SafetySignsPH | Page 343

15. Stray or Impressed Currents and Bonding
a. Where stray or impressed currents are present, ignition shall be
taken in accordance with API RP 2003, Protection Against Ignitions
Arising Out of Static, Lightning, and Stray Currents.
b. Static protection shall not be required where CNG is loaded or
unloaded by conductive or nonconductive hose, flexible metallic
tubing, or pipe connections where both halves of the metallic
couplings are in contact.
c. A cylinder shall not be charged in excess of the design pressure at
the normal temperature for that cylinder as per manufacturer’s
instructions.
d. A fuel supply container shall not have a settled pressure above the
service pressure that is stamped on the container and displayed on
a label near the filling connection, corrected for the ambient
temperature at the time of filling.
e. CNG dispensing systems shall be equipped to stop fuel flow
automatically when a fuel supply container reaches the
temperature-corrected fill pressure.
Where an overpressure
incident that results in operation of the overpressure protection
system occurs, the dispenser pressure control system shall be
examined and certified by a qualified technician prior to being
returned to service.
f.
The transfer of CNG into a fuel supply container shall be performed
in accordance with instructions posted at the dispensing station.
g. Where CNG is being transferred to or from a motor vehicle, the
engine shall be turned off.
h. During the transfer of CNG to or from cargo vehicles, the hand or
emergency brake of the vehicle shall be set, and chock blocks
shall be used to prevent rolling of the vehicle.
i. Transfer systems shall be capable of depressurizing to facilitate
disconnection. Bleed connections shall lead to a safe point of
discharge.
j. Sources of ignition shall not be permitted within three meters (3.0 m)
of any filling connection during a transfer operation.
k. A warning sign with the words “STOP MOTOR, NO SMOKING,
FLAMMABLE GAS” shall be posted at dispensing station and
compressor areas. The location of signs shall be determined by
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