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// CODE SNIPPET

2209.5.4.3.6 Alternative Venting Systems

Fire Code 2009 of Massachusetts > 22 Motor Fuel-Dispensing Facilities and Repair Garages > 2209 Hydrogen Motor Fuel-Dispensing and Generation Facilities > 2209.5 Safety Precautions > 2209.5.4 Venting of Hydrogen Systems > 2209.5.4.3 Vent Pipe > 2209.5.4.3.6 Alternative Venting Systems
JUMP TO FULL CODE CHAPTER
Where alternative venting systems are used in lieu of the requirements of Section 2209.5.4.3.5, an analysis of radiant heat exposures and hydrogen concentrations shall be provided. The analysis of exposure to radiant heat shall assume a wind speed of 30 feet/second (9.14 m/sec) and provide a design that limits radiant heat exposure to the maximum values shown in Table 2209.5.4.3.6(1). The analysis of exposure to hydrogen concentration shall provide a design that limits the maximum hydrogen concentration to the values shown in Table 2209.5.4.3.6(2).
TABLE 2209.5.4.3.6(1)
MAXIMUM RADIANT HEAT EXPOSURE
EXPOSED OBJECT MAXIMUM RADIANT HEAT TIME DURATION (minutes)
Personnel 1,500 Btu/hr • ft2 (4732 W/m2) 3
Noncombustible equipment 8,000 Btu/hr • ft2 (25 237 W/m2) Any
Lot line 500 Btu/hr • ft2 (1577 W/m2) Any
TABLE 2209.5.4.3.6(2)
MAXIMUM HYDROGEN CONCENTRATION EXPOSURE
EXPOSED OBJECT MAXIMUM HYDROGEN CONCENTRATION
Personnel, buildings or equipment 50% LFL within a distance of D and H of Table 2209.5.4.3.4
Lot line 50% LFL within 1.25 times the distance of D and H of Table 2209.5.4.3.4
H = Minimum height in feet (mm) of vent pipe above the ground or above any structure or equipment within distance (D) where personnel might be present.
D= Distance in feet (mm) to adjacent structure or equipment where personnel might be present.

Related Code Sections


2209.5.4.3.6 Motor Fuel-Dispensing Facilities and Repair Garages, Alternative Venting Systems
Where alternative venting systems are used in lieu of the requirements of Section 2209.5.4.3.5, an analysis of radiant heat exposures and hydrogen ...
Fire Code 2009 of Massachusetts > 22 Motor Fuel-Dispensing Facilities and Repair Garages > 2209 Hydrogen Motor Fuel-Dispensing and Generation Facilities > 2209.5 Safety Precautions > 2209.5.4 Venting of Hydrogen Systems > 2209.5.4.3 Vent Pipe > 2209.5.4.3.6 Alternative Venting Systems
G2428.2.1 Fuel Gas, (504.2.1) Vent Obstructions
These venting tables shall not be used where obstructions, as described in Section G2427.15, are installed in the venting system. The installation ...
MA State Building Code, 9th ed, Residential Volume > 24 Fuel Gas > G2428 (504) Sizing of Category I Appliance Venting Systems > G2428.2 (504.2) Application of Single Appliance Vent Tables G2428.2(1) and G2428.2(2) > G2428.2.1 (504.2.1) Vent Obstructions
AF103.6.1 Radon Control Methods, Vent Pipe
material. Alternatively, the 3-inch (76 mm) pipe shall be inserted directly into an interior perimeter drain tile loop or through a sealed sump cover ...
MA State Building Code, 9th ed, Residential Volume > F Radon Control Methods > AF103 Requirements > AF103.6 Passive Subslab Depressurization System > AF103.6.1 Vent Pipe
G2427.10.3 Fuel Gas, (503.10.3) Size of Vent Connector
an alternative method applicable only when all of the appliances are draft hood equipped, each vent connector shall have an effective area not less than ...
MA State Building Code, 9th ed, Residential Volume > 24 Fuel Gas > G2427 (503) Venting of Appliances > G2427.10 (503.10) Vent Connectors for Category I Appliances > G2427.10.3 (503.10.3) Size of Vent Connector
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