Page 289 - 2018_IFC

MOTOR FUEL-DISPENSING FACILITIES AND REPAIR GARAGES

In addition to the requirements in Section 2305, the owner movement of the vessel based on the highest gas-
of a self-service CNG motor fuel-dispensing facility shall release velocity through valve orifices at the ves-
ensure the safe operation of the system and the training of sel’s rated pressure and volume. The structure or
users. appurtenance shall be constructed of noncombusti-
ble materials.
2308.5 Pressure regulators. Pressure regulators shall be
designed and installed or protected so that their operation will 2308.8.1.2.3 Separation. The structure or appurte-
not be affected by the elements (freezing rain, sleet, snow or nance used for stabilizing the cylinder shall be sepa-
ice), mud or debris. The protection is allowed to be an inte- rated from the site equipment, features and
gral part of the regulator. exposures and shall be located in accordance with
Table 2308.8.1.2.3.
2308.6 Valves. Gas piping to equipment shall be provided
with a remote, manual shutoff valve that is provided with TABLE 2308.8.1.2.3
ready access. SEPARATION DISTANCE FOR ATMOSPHERIC VENTING OF CNG
2308.7 Emergency shutdown control. An emergency shut- EQUIPMENT OR FEATURE MINIMUM SEPARATION (feet)
down control shall be located within 75 feet (22 860 mm) of,
but not less than 25 feet (7620 mm) from, dispensers and Buildings 25
shall be provided in the compressor area. Upon activation, the Building openings 25
emergency shutdown system shall automatically shut off the
power supply to the compressor and close valves between the CNG compressor and storage vessels 25
main gas supply and the compressor and between the storage CNG dispensers 25
containers and dispensers.
Lot lines 15
2308.8 Discharge of CNG from motor vehicle fuel storage Public ways 15
containers. The discharge of CNG from motor vehicle fuel
cylinders for the purposes of maintenance, cylinder certifica- Vehicles 25
tion, calibration of dispensers or other activities shall be in For SI: 1 foot = 304.8 mm.
accordance with Sections 2308.8.1 through 2308.8.1.2.6.
2308.8.1 Methods of discharge. The discharge of CNG 2308.8.1.2.4 Grounding and bonding. The struc-
from motor vehicle fuel cylinders shall be accomplished ture or appurtenance used for supporting the cylin-
through a closed transfer system in accordance with Sec- der shall be grounded in accordance with NFPA 70.
tion 2308.8.1.1 or an approved method of atmospheric The cylinder valve shall be bonded prior to the com-
venting in accordance with Section 2308.8.1.2. mencement of venting operations.
2308.8.1.2.5 Vent tube. A vent tube that will divert
2308.8.1.1 Closed transfer system. A documented
procedure that explains the logical sequence for dis- the gas flow to atmosphere shall be installed on the
charging the cylinder shall be provided to the fire code cylinder prior to commencement of the venting and
official for review and approval. The procedure shall purging operation. The vent tube shall be con-
include what actions the operator will take in the event structed of pipe or tubing materials approved for use
of a low-pressure or high-pressure natural gas release with CNG in accordance with Chapter 53.
during the discharging activity. A drawing illustrating The vent tube shall be capable of dispersing the
the arrangement of piping, regulators and equipment gas not less than 10 feet (3048 mm) above grade
settings shall be provided to the fire code official for level. The vent tube shall not be provided with a rain
review and approval. The drawing shall illustrate the cap or other feature that would limit or obstruct the
piping and regulator arrangement and shall be shown in gas flow.
spatial relation to the location of the compressor, stor- At the connection fitting of the vent tube and the
age vessels and emergency shutdown devices. CNG cylinder, a listed bidirectional detonation
2308.8.1.2 Atmospheric venting. Atmospheric vent- flame arrester shall be provided.
ing of CNG shall comply with Sections 2308.8.1.2.1 2308.8.1.2.6 Signage. Approved “No Smoking”
through 2308.8.1.2.6. signs complying with Section 310 shall be posted
2308.8.1.2.1 Plans and specifications. A drawing within 10 feet (3048 mm) of the cylinder support
illustrating the location of the vessel support, piping, structure or appurtenance. Approved CYLINDER
the method of grounding and bonding, and other SHALL BE BONDED signs shall be posted on the
requirements specified herein shall be provided to cylinder support structure or appurtenance.
the fire code official for review and approval.
2308.8.1.2.2 Cylinder stability. A method of rig- SECTION 2309
idly supporting the vessel during the venting of HYDROGEN MOTOR
CNG shall be provided. The selected method shall FUEL-DISPENSING AND GENERATION FACILITIES
provide not less than two points of support and shall
prevent the horizontal and lateral movement of the 2309.1 General. Hydrogen motor fuel-dispensing and gener-
vessel. The system shall be designed to prevent the ation facilities shall be in accordance with this section and

256 2018 INTERNATIONAL FIRE CODE ®
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