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MOTOR FUEL-DISPENSING FACILITIES AND REPAIR GARAGES 2209.5.4.2.1 Minimum rate of discharge.The mini native venting systems shall be allowed when in mum flow capacity of pressure relief devices on accordance with Section 2209.5.4.3.6. hydrogen storage containers shall be at least the 2209.5.4.3.5 Maximum flow rate.The vent pipe sys- capacity required by Section 2209.5.4.2 or the capac tem shall be sized based on the maximum flow rate for ity required to accommodate a hydrogen compressor the system served and be specified on the construction that fails to shut down or unload,whichever is greater. documents. The maximum flow rate shall be deter- , 2209.5.4.3 Vent pipe. Stationary containers and tanks mined in accordance with the requirements of CGA shall be provided with a vent pipe system that will divert S-1.3 using the aggregate gas flow rate from all con gas discharged from pressure relief devices to the atmo- nected vent,purge and relief devices that operate simul- sphere.Vent pipe systems serving pressure relief devices famously during a venting operation,purging operation and purging systems used for operational control shall be or emergency relief event. designed and constructed in accordance with Sections 2209.5.4.3.6 Alternative venting systems. Where 2209.5.4.3.1 through 2209.5.4.3.6. alternative venting systems are used in lieu of the requirements of Section 2209.5.4.3.5, an analysis of 2209.5.4.3.1 Materials of construction. The vent radiant heat exposures and hydrogen concentrations pipe system shall be constructed of materials shall be provided.The analysis of exposure to radiant approved for hydrogen service in accordance with heat shall assume a wind speed of 30 feet/second ASME B31.3 for the rated pressure,volume and tem- (9.14 m/secsure)andtothe providemaximum a designvalues that limitsshownin radiantTable perature of gas to be transported. The vent piping heat expo shall be designed for the maximum backpressure 2209.5.4.3.6(1). The analysis of exposure to hydro- within the pipe, but not less than 335 pounds per gen concentration shall provide a design that limits square inch gauge(psig)(2310 kPa). the maximum hydrogen concentration to the values 2209.5.4.3.2 Structural support.The vent pipe sys- tem shall be supported to prevent structural collapse and shall be provided with a rain cap or other feature SECTION 2210 that would not limit or obstruct the gas flow from MARINE MOTOR FUEL-DISPENSING FACILITIES venting vertically upward. 2210.1 General.The construction of marine motor fuel-dis- 1 2209.5.4.3.3 Obstructions.A means shall be provided pensing facilities shall be in accordance with the International to prevent water,ice and other debris from accumulating Building Code and NFPA 30A.The storage of Class I,H or IIIA inside the vent pipe or obstructing the vent pipe. liquids at marine motor fuel-dispensing facilities shall be in 2209.5.4.3.4 Height of vent and separation. The accordance with this chapter and Chapter 34. height(II)and separation distance(D)of the vent pipe 2210.2 Storage and handling. The storage and handling of shall meet the criteria set forth in Table 2209.5.4.3.4 Class I,II or IIIA liquids at marine motor fuel-dispensing facil- for the combinations of maximum hydrogen flow ities shall be in accordance with Sections 2210.2.1 through 1 rates and vent stack opening diameters listed.Alter- 2210.2.3. TABLE 2209.5.4.3.4 1 VENT PIPE HEIGHT AND SEPARATION DISTANCE VERSUS HYDROGEN FLOW RATE AND VENT PIPE DIAMETER a,b,c,a,e,e HYDROGEN 5 500 CFM >500 to 51,000 CFM >1,000 to 5 2,000 >2,000 to 5 5,000 >5,000 to 5 10,000 >10,000 to 520,000 FLOW RATE at NTPg at NTPg CFM at NTP9 CFM at NTPh CFM at NTP^ CFM at NTP" 011 Height(ft) 8 8 12 17 25 36 Distance(ft) 13 17 26 40 53 81 For SI: 1 inch=25.4 mm,1 foot=304.8 mm,1 Btu/ft2=3.153W/m2,1 foot/second=304.8 mm/sec. a. Minimum distance to property line is 1.25D. b. Designs seeking to achieve greater heights with commensurate reductions in separation distances shall be designed in accordance with accepted engineering prac- tice. c. With this table personnel on the ground or on the building and/or equipment are exposed to a maximum of 1,500 Btu/hr.ft2,and are assumed to be provided with a means to escape to a shielded area within 3 minutes,including the case of a 30 ft./sec.wind. d. Designs seeking to achieve greater radiant exposures to noncombustible equipment shall be designed in accordance with accepted engineering practice. e. The analysis reflected in this table does not permit hydrogen air mixtures that would exceed one-half of the lower flammable limit(LFL)for hydrogen(2 percent by volume)at the building or equipment,including the case of a 30 ft./sec.wind. f. See Figure 2209.5.4.3.4. I g. For vent pipe diameters up to and including 2 inches. h. For vent pipe diameters up to and including 3 inches. 2006 INTERNATIONAL FIRE CODE® 209