Specific requirements

Rule 98. Sections 3-2.1, 3-2.4 and table 3-2.1 are reproduced from NFPA 50B, and sections 3-2.2, 3-2.2.1, 3-2.3, 3-2.5 to 3-2.8 and table 3-2.2 of the storage and handling of gaseous and Liquefied H2 code are added as follows: 3-2 Specific requirements. 3-2.1 The location of liquefied hydrogen storage, as determined by the maximum total quantity of liquefied hydrogen, shall be in the order of preference indicated by the Roman numerals in table 3-2.1.

Table 3-2.1 Preferred Locations of Liquefied Hydrogen Systems Nature of Location Size of Hydrogen Storage

39.63 gal to 50 gal 51 gal to 300 gal 301 gal to In excess of (150 L to 189.25 L) 600 gal 600 gal (193.03 L to 1135.5 L) (1139.29 L to (2271 L) 2271 L) Outdoors I I I I In a separate building II II II Not permitted In a special room III III Not permitted Not permitted Inside buildings IV Not permitted Not permitted Not permitted Not in a special room or exposed to other occupancies

3-2.2 The minimum distance in feet from liquefied H2 systems of indicated storage capacity located either outdoors, in a separate building, or in a special room to any specified exposure shall be in accordance with table 3-2.2. Exception: The distances in numbers 1, 4, 6, 7, 8, and 11 in table 3-2.2 may be reduced by 2/3, but not to less than 5 feet (1.5 meters), for insulated portions of the systems. For uninsulated portions of the system, the distances may be reduced by the use of protective structures having a minimum fire resistance rating of 2 hours. The protective structure or the insulated liquefied H2 container shall interrupt the line of sight between uninsulated portions of the liquefied H2 storage system and the exposure. (a) An aboveground H2 storage container system shall be erected per table 3- 2.2 but not less than 75 feet (22.9 meters) from any of the following: (i) A school. (ii) A church. (iii) A hospital. (iv) A theater. (v) Assembly occupancy for 50 or more persons. Exception: The restrictions in section 3-2.2(a) shall not apply to an aboveground H2 system used exclusively for stationary power generation. 3-2.2.1 Loose or piled combustible materials and weeds and long dried grass shall not be permitted within 10 feet (3.1 meters) of any system.

Table 3-2.2 Minimum Distance from Liquefied Hydrogen Systems to Exposures

Total Liquefied H2 Storage 39.63 gal to 3,501 gal to 15,001 gal to Type of Exposure 3,500 gal (ft) 15,000 gal (ft) 75,000 gal (ft) 1. Building or structure

(a) Wall(s) adjacent to system constructed of non‐combustible or limited‐combustible materials

(1)Sprinklered building or structure or unsprinklered 5a 5a 5a building or structure having noncombustible contents (2) Unsprinklered building or structure with combustible contents. 25 50 75

Adjacent wall(s) with fire resistance rating less than 3 hoursb Adjacent wall(s) with fire resistance rating of 3 hours or 5 5 5 greaterb

(b) Wall(s) adjacent to system constructed of combustible materials

50 50 50 (1) Sprinklered building or structure (2) Unsprinklered building or structure 50 75 100 2. Wall openings

(a) Openable 75 75 75 (b) Unopenable 25 50 50 3. Air compressor intakes or inlets for air‐conditioning 75 75 75 or ventilating equipment 4. All classes of flammable and combustible liquid containers (above ground, and vent or fill openings if 50 75 100 below ground) (see 3‐1.3)c 5. Between stationary liquefied H2 containers 5 5 5 6. Flammable gas storage other than H2 50 75 75 7. Liquid oxygen storage and other oxidizers (see 3‐1.3) 75 75 75 8. Combustible solids 50 75 100 9. Open flames and welding 50 50 50 10. Places of public assembly for 50 or more persons 75 75 75 11. Public ways, railroads, and property lines 25 50 75 12. Inlet to underground sewers 10 10 10 13. Places of public assembly less than 50 people 25 50 50 14. Flammable/Combustible liquid dispenser other than 10 10 10 H2 For SI units: 1 ft = 0.305 m; 1 gal = 3.785 L.

a Portions of wall less than 10 ft (3 m) (measured horizontally) from any part of a system shall have a fire resistance rating of at least 1/2 hour.

b Exclusive of windows and doors.

c Distances can be reduced to 15 ft (4.6 m) for class IIIB combustible liquids.

3-2.3 Cargo transport unloading. Unloading connections on delivery equipment shall not be positioned closer to any of the exposures cited in table 3-2.2 than the distances given for the storage system. The following shall apply: (a) For stationary container system installations or stationary multiple container systems utilizing a common or manifolded transfer line, or railroad tank car transfer systems to fill trucks with no stationary storage involved shall comply with all of the following: (i) Owners and operators shall ensure that fixed piping is used between the container and master shutoff and check valves. The piping and manifolds shall be secured to the container frame. Flexible hoses are permitted between the check valve and the cargo vehicle unloading connection.

Exception: Bulkheads will be located at a minimum of 1.5 feet (45.72 centimeters) when crash protection is provided at 10 feet (3.1 meters) from storage container. (ii) Emergency shutoff valves required in this section shall be tested annually for proper operation. The results of the tests shall be documented. (iii) All installations shall have at least 1 clearly identified and easily accessible manually operated remote emergency shutoff device. Within 1 year after the effective date of these rules, existing installations shall have at least 1 clearly identified and easily accessible manually operated remote emergency shutoff device. The emergency shutoff device shall be located not less than 20 feet (6.1 meters) nor more than 100 feet (30.5 meters) in the path of egress from the emergency shutoff valve and not less than 20 feet (6.1 meters) from the container system. (iv) During transfer of H2 to and 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. (v) Transfer systems shall be capable of depressurizing to facilitate disconnection. Bleed connections shall lead to a safe point of discharge. (vi) Cargo vehicle shall be equipped with air-brake interlock in front of the unloading connection to protect against drive-away. (b) The delivery vehicle shall be located so that all parts of the vehicle are on the premises when delivery is made, and shall comply with all of the following: (i) Vent connections shall be provided so that loading arms and hoses can be depressurized and vented prior to disconnection if necessary. The connections for liquefied H2 shall be piped to a vent stack in accordance with part 2, section 2-2.2. (ii) When transfers are made into fueling facility containers, the liquefied H2 shall be transferred at a pressure that shall not over-pressurize the receiving container. (iii) The transfer piping shall be equipped with a check valve to prevent backflow from the container being filled to the transport vehicle. Check valve shall be located as close as practicable to the container. (iv) If the fueling facility container or transfer equipment is located in a remote area relative to the delivery vehicle operating status indicators, that is those that indicate container level, these container status indicators shall be provided in the unloading area. (v) At least 1 qualified person shall be in continuous attendance and shall have an unobstructed view of the transfer point while unloading is in progress. (vi) Sources of ignition shall not be permitted in the unloading area while transfer is in progress. (vii) The cargo transport vehicle's engine shall be shut off while the transfer hose or piping is being connected or disconnected. If required for liquefied H2 trailer pumping transfer, the engine pump drive motor may be started and used during the liquid transfer operations. 3-2.4 The minimum distance of container fill connections from parked vehicles shall be 25 ft (7.6 m). 3-2.5 An owner and operator shall ensure that a container systems are properly designed and constructed in accordance with the ASME and that any portion, which is

underground, mounded, or partially underground, is protected from corrosion by either of the following: (a) The ASME approved container system is cathodically protected by all the following requirements: (i) The ASME approved container system is coated with a suitable dielectric material approved by the department. (ii) Factory-installed or field-installed cathodic protection systems are designed by a corrosion expert or in accordance with the NACE recommended practice RP0285 entitled "Corrosion Control of Underground Storage Tank Systems by Cathodic Protection" or impressed current systems are designed to allow a determination of current operating status as required in section 5.4-1 of the H2 code. (iii) Cathodic protection systems are operated and maintained in accordance with the provisions of section 5.4-1 of the H2 code. (b) Other methods as approved by the department and in the best interest of public health, safety, and welfare, and the environment. 3-2.6 Out-of-service aboveground containers. 3-2.6.1 Containers that are no longer in service for a period of 12 months shall be closed. To close the aboveground container, the owner or operator shall empty the container, purge it with an inert gas and safeguard it against tampering. Piping that is removed from service shall be purged with an inert gas and capped or removed. 3-2.6.2 Each container that is to be reused at the original location or a new location shall be purged with an inert gas and be in compliance with all the requirements for the installation of a new container, and shall be recertified by the manufacturer, or authorized representative, and tested in accordance with the container's design specifications or be pressure tested with an inert gas or H2 at 1.1 times the MOP for not less than 10 minutes. Piping that is to be reused shall be in compliance with all the requirements for the installation of new piping and shall be tested in compliance with section 3-2.8 of this code prior to being brought back into service. 3-2.7 Out-of-service underground, mounded, and partially buried containers. 3-2.7.1 Containers that are no longer used to store H2 and are not intended to be brought back into service shall be permanently closed. To permanently close the container, the container shall be emptied and purged with an inert gas to render the container free of H2, and then the container shall be removed from the ground. When a structure above or near the container prevents removal, the container shall be emptied and purged with an inert gas to render the container free of H2, then the container shall be filled with an inert solid material. Piping that is permanently removed from service shall be purged with an inert gas and capped or removed. 3-2.7.2 Containers may be rendered temporarily out-of-service only when it is intended they be brought back into service at a later date. To temporarily close a container, all of the following requirements shall be met: (a) The container shall be emptied and purged with an inert gas. (b) Corrosion protection for the container and all underground piping shall be maintained in compliance with section 5-4.1 of this code. (c) The vent line shall remain functional. (d) The container shall be secured against tampering.

(e) Piping that is temporarily removed from service shall be purged with an inert gas and capped. 3-2.7.2.1 Each container that is temporarily out-of-service greater than 12 months shall be pressure tested with an inert gas at 1.1 times the MOP for not less than 10 minutes prior to being brought back into service. Temporarily out-of-service piping shall be tested in compliance with section 3-2.8 of this code prior to being brought back into service. 3-2.8 Testing. After installation, prior to being placed into service, all container connections, piping, tubing, hose, and hose assemblies shall be tested by an approved method as outlined in ASME B31.3 "Process Piping," adopted by reference in section 8, or by a method acceptable to the department based on the best interest of public health, safety, and welfare, and the environment.

History: 2008 AACS.