UL 246:2018-12 Hydrants for Fire-Protection Service.
1.1 These requirements cover the performance of and methods for testing hydrants intended for use in
piping systems supplying water for fire-protection service.
1.2 Hydrant types covered by this standard include:
a) Base valve design and
b) Wet barrel design.
1 .2A Traffic model hydrants of both the base valve and wet barrel design may be Standard. However, these requirements are not intended to cover the performance of testing break features of traffic model hydrants.
covered by this and methods for
1.3 Requirements for the installation and use of hydrants covered by these requirements include, among others, the Standard for the Installation of Private Fire Service Mains, NFPA 24.
1.4 A product that contains use when the standard was shall be evaluated using determined by the intent of
2 General
2.1 Components
features, characteristics, materials, or systems new or different from those in developed, and that involves a risk of fire, electric shock, or injury to persons the appropriate additional component and end-product requirements as this standard.
2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component.
2.1.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or
b) Is superseded by a requirement in this standard.
2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use.
2.1.4 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.
2.2 Units of measurement
2.2.1 If a value for measurement is followed by a value in other units in parentheses, the second value may be only approximate.
2.3 Undated references
2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard.
3 Glossary
3.1 For the purposes of this standard, the following definitions apply.
3.2 BASE VALVE DESIGN HYDRANT (DRY BARREL) — A hydrant intended for use in all climates where the main valve is installed below the frost line and the main valve is either the compression type, opening with the pressure or against pressure, or gate type with the outlets individually valved or without valves.
3.3 HYDRANT — An exterior valved connection to a water supply system that provides connections for hoses. UL 246 pdf download.