Michigan Administrative Code
Department - Licensing and Regulatory Affairs
Bureau of Fire Services
Storage and Handling of Gaseous and Liquefied Hydrogen Systems
Part 2 - STORAGE AND HANDLING OF GASEOUS HYDROGEN NFPA 50A
Chapter 1 - General information
Section R. 29.7014 - Definitions

(a) "ANSI" means the american national standards institute.

(b) "Approved" means acceptable to the department.

(c) "ASME" means the american society of mechanical engineers.

(d) "Authority having jurisdiction" means the department.

(e) "Automatic emergency shutoff valve" means a designated fail-safe automatic closing valve designed to shutoff the flow of gases or liquids that is initiated by a control system where the control system is activated by either manual or automatic means.

(f) "Bulk storage" means a single container or containers, where all containers draw down at the same time.

(g) "Cargo transport container" means a mobile unit designed to transport gaseous or liquefied H2.

(h) "Cascade storage system" means storage in containers or cylinders arranged in banks where each bank acts as 1 large container. The banks are separated by switching valves to provide sequential drawdown of the banks.

The bank may consist of 1 or more containers or cylinders.

(i) "Cathodic protection" means a technique to prevent the corrosion of a metal surface by making the surface the cathode of an electrochemical cell. This protection renders a metallic container or piping component negatively charged with respect to its environment. This protection shall be designed by a corrosion expert as defined by these rules.

(j) "Cathodic protection tester" means a person who can demonstrate an understanding of the principles and measurements of all common types of cathodic protection systems applicable to metal piping and container systems and who has education and experience in soil resistivity, stray current, structure-to-soil potential, and component electrical isolation measurements of metal piping and container systems. The person shall be certified as being qualified by the national association of corrosion engineers (NACE) international.

(k) "Composite container" means a container fabricated of 2 or more materials that interact to facilitate the container design criteria.

(l) "Compression discharge pressure" means the varying pressure at the point of discharge from the compressor.

(m) "CGA" means the compressed gas association.

(n) "Container" means a pressure vessel or cylinder used to store H2.

(o) "Container appurtenances" means devices connected to container openings for safety, control, or operating purposes.

(p) "Container system" means a container or combination of containers and all attached appurtenances, valves, and piping.

(q) "Container valve" means a valve connected directly to the container outlet.

(r) "Continuous gas detection system" means a gas detection system in which the instrument is maintained in continuous operation.

(s) "Corrosion expert" means a person who, by reason of thorough knowledge of the physical sciences and the principals of engineering and mathematics acquired by a professional education and related practical experience, is qualified to engage in the practice of corrosion control of container systems. The person shall be certificated as being qualified by NACE, as a senior corrosion technologist, a cathodic protection specialist, or a corrosion specialist or be a registered engineer who has certification and licensing that includes education and experience in corrosion control.

(t) "Corrosion protection" means protecting a container system to prevent the degradation of the metal through oxidation or reactivity with its environment.

(u) "Cylinder" means a container constructed in accordance with the United States Department of Transportation (U.S. DOT) specifications, title 49, code of federal regulations (CFR), parts 171-190.

(v) "Department" means the department of environmental quality.

(w) "Director" means the director of the department of environmental quality.

(x) "Dispensing station" means an H2 installation that dispenses H2 from storage containers into fuel supply containers or into portable cylinders by means of a compressor, reformer, vaporizer, or pressure booster.

(y) "Emergency shutdown device (ESD)" means a device that closes all fueling operations within the fueling facility from either local or remote locations.

(z) "Excess flow control" means to limit or stop the flow of H2 gas from a source of supply when there is a rupture, break, or 'open valve to atmosphere' condition that may present a hazard to personnel or the environment.

(aa) "Fail-safe" means a design feature that provides for the maintenance of safe operating conditions in the event of a malfunction of control devices or an interruption of an energy source.

(bb) "Fast fill station" means a storage and dispensing system designed to fill motor vehicle fuel tanks with compressed, gasified H2. The vehicle fuel tank is filled by connecting to a system designed to provide a fuel fill rate above 12 scfm.

(cc) "Fixed liquid level device" means a device that indicates when the container is filled to its maximum permitted liquid filling volume.

(dd) "Flow-through process container" means a container that forms an integral part of a production process through which there is a steady, variable, recurring, or intermittent flow of materials during the operation of the process and the container is utilized to carry out or control the heating, cooling, mixing, blending, separating, metering, or chemical reaction of materials. The processing is done on a regular basis and it is the primary function of the container. A flow-through process container does not include a container that is used for the storage of materials before its introduction into the production process or for the storage of finished products or by-products from the production process or a container that is only used to recirculate materials.

(ee) "Fuel dispenser system" means all the pumps, meters, piping, hose, and controls used for the delivery of fuel.

(ff) "Fueling connector" means a mating device at the refueling station, including shutoff valves that connect the fueling dispenser hose to the vehicle fuel filling system receptacle for the transfer of liquid or vapor.

(gg) "Gallon water capacity (wc)" means the amount of water in gallons at 60 degrees Fahrenheit (15 degrees Celsius) required to fill a container.

(hh) "Gas detection system" means a grouping of 1 or more sensors capable of detecting an H2 leak at specified concentrations and activating alarms and safety systems.

(ii) "Gaseous H2 system" means a system in which the H2 is delivered, stored, and discharged in the gaseous form including the piping system. The gaseous H2 system terminates at the point where the H2 is dispensed.

(jj) "Hydrogen (H2)" means the simplest and lightest element in the known universe, which exists as a gas except at low cryogenic temperatures.H2 gas is a colorless, odorless and highly flammable gas when mixed with oxygen over a wide range of concentrations. H2 forms water when combusted, or when otherwise joined with oxygen, as within a fuel cell.

(kk) "Hydrogen code" means the storage and handling of gaseous and liquefied H2 rules as promulgated by the department.

(ll) "Hydrogen gas vehicle (HGV) or vehicle" means a self-propelled device on land, in, on, or by which any person or property is or may be transported or drawn upon, except for a device exclusively moved by human power, and which has the capability to use H2 gas as an engine fuel.

(mm) "Ignition source" means any item or substance capable of an energy release of type and magnitude sufficient to ignite any flammable mixture of gases or vapors that could occur at the site.

(nn) "kPa" means absolute pressure in kilo-Pascals.

(oo) "kPag" means gauge pressure in kilo-Pascals.

(pp) "Labeled" means equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the department and concerned with product evaluation, that maintains periodic inspection of production of labeled equipment or materials, and by whose labeling the manufacturer indicates compliance with accepted or approved standards of construction and or performance.

(qq) "Listed" means equipment, materials, or services included in a list published by an organization that is acceptable to the department and concerned with evaluation of products or services, that maintains periodic inspection of production listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose.

(rr) "Manifolded storage system" means storage in containers arranged in banks where each bank acts as 1 large container. The banks are separated by switching valves to provide sequential drawdown of the banks. The bank may consist of 1 or more containers.

(ss) "Manual emergency shutoff valve" means a designated valve designed to shutoff flow due to a rupture in pressurized piping system.

(tt) "Maximum allowable working pressure (MAWP)" means the maximum pressure to which any component or portion of the pressure system can be subjected.

(uu) "Maximum operating pressure (MOP)" means the steady-state gauge pressure at which a part or system normally operates.

(vv) "Metal hydride storage system" means a system for the storage of H2 gas absorbed in solid material.

(ww) "Motor fuel dispensing facility" means that portion of the property where H2 is stored and dispensed from fixed equipment into the fuel tanks of motor vehicles, marine craft, or into approved containers, including all equipment used in connection therewith.

(xx) "NACE" means the national association of corrosion engineers, international.

(yy) "Original equipment manufacturer (OEM)" means an original equipment motor vehicle manufacturer that certifies that the motor vehicle complies with applicable federal motor vehicle safety codes.

(zz) "Partially buried container" means a container that has part of, but less than 100%, of the container surface covered with earth.

(aaa) "Point of transfer" means the point where the transfer connection is made.

(bbb) "Portable container" means a container designed to be moved readily, as distinguished from containers designed for stationary installations. Portable containers, designed for transportation with H2, filled to their maximum filling limit, include "cylinders," "cargo tanks," and "portable tanks," all 3 of which are defined separately. Containers designed to be readily moved from 1 usage location to another, but substantially empty of product, are "portable storage containers" and are defined separately.

(ccc) "Portable storage container" means a container similar to those designed and constructed for stationary installation, designed so that it can be moved readily over the highways, substantially empty of H2, from 1 usage location to another. Such containers either have legs or other supports attached, or are mounted on running gear, such as trailer or semitrailer chassis, with suitable supports that can be of the fold-down type, allowing them to be placed or parked in a stable position on a reasonably firm and level surface. For large-volume, limited-duration product usage, such as at construction sites and normally for 6 months or less, portable storage containers function in lieu of permanently installed stationary containers.

(ddd) "Portable tank, or skid tank" means a container of more than 1,000 lb (454 kilogram) water capacity used to transport H2, handled as a package, that is, filled to its maximum permitted filling limit. Such containers are mounted on skids or runners and have all container appurtenances protected in such a manner that they can be safely handled as a package.

(eee) "Pressure relief device (PRD)" means a pressure or temperature activated device used to prevent pressure from rising above a specified value and thereby prevent the rupture of a normally charged pressure vessel or a cylinder due to emergency or abnormal conditions.

(fff) "Pressure vessel" means a container or other component designed in accordance with the ASME code.

(ggg) "psi" means pounds per square inch.

(hhh) "psia" means pounds per square inch, absolute.

(iii) "psig" means pounds per square inch gauge.

(jjj) "Rated pressure" means the pressure to which a component is rated provided that the MAWP is observed for temperature extremes.

(kkk) "Release" means an unexpected discharge of H2.

(lll) "Remotely located manually activated shutdown control" means a control system that is designed to initiate shut down of the flow of gas or liquid that is manually activated from a point located some distance from the delivery system.

(mmm) "Residential fueling facility" means a listed vehicle fueling appliance used for the compression and delivery of H2 into vehicles at a residence which includes its associated equipment and piping.

(nnn) "Service pressure" means the nominal gas pressure at a uniform gas temperature of 70 degrees Fahrenheit (21 degrees Celsius) when the equipment is properly and completely charged with gas; the nominal design pressure for which the equipment has been constructed.

(ooo) "Set pressure" means the start-to-discharge pressure for which a relief valve is set and marked.

(ppp) "Standard cubic foot per minute (scfm)" means the amount of gas flow in standard cubic feet per minute compensated for pressure and temperature.

(qqq) "Substantially empty" means a gas container of H2 when the residual gas pressure is less than 10% of the maximum allowable working pressure of the vessel.

(rrr) "Vehicle-fueling appliance" means a self-contained listed assembly used for the compression and delivery of H2 gas into vehicles including associated equipment and piping of the appliance.1-5.1 NFPA official definitions. Combustible Liquid. A liquid having a closed-cup flash point at or above 100Chr(176) F (37.8Chr(176)C) and are subdivided as follows: