UL 2443:2018-11 Flexible Sprinkler Hose with Fittings for Fire Protection Service.
1.1 UL 2443 covers flexible sprinkler hose with fittings intended for direct connection to fire sprinklers in installations requiring a flexible attachment to the sprinkler system piping such as clean rooms, suspended ceilings, and exhaust ducts.
1.2 The products covered by this standard are intended for use in sprinkler systems installed in
accordance with the Standard for Installation of Sprinkler Systems, NFPA 13; Standard for the Installation
of Sprinkler Systems in Residential Occupancies Up to Four Stories in Height, NFPA 13R; and Standard
for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Mobile Homes, NFPA
2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component.
2.2 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b) Is superseded by a requirement in this standard.
2.3 A component shall be used in accordance with its rating established for the intended conditions of use.
2.4 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.
3 Units of Measurement
3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information.
4 Undated References
4.1 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.
5.1 For the purpose of this standard the following definitions apply:
5.2 BEND — A 90-degree change in direction of the flexible sprinkler hose.
5.3 FLEXIBLE HOSE WITH FITTINGS HAVING HIGH FLEXIBILITY — This type of hose with fittings is intended to be used in applications where frequent movement between the two ends of the hose is expected after installation.
5.4 FLEXIBLE HOSE WITH FITTINGS HAVING LIMITED FLEXIBILITY — This type of hose with fittings is intended to be used in applications where little or no movement between the two ends is expected after installation.
5.5 MINIMUM BEND RADIUS — The least distance permitted by the manufacturer as measured from the focal point to the centerline of the hose. See Figure 5.1. UL 2443 pdf download.