UL 789:2004 pdf download Indicator Posts for Fire- Protection Service
Scope
1.1 These requirements cover indicator posts,including wall and underground types, for use in operatingvalves of the inside-screw pattern and for indicating the position of the gates in such valves. lndicatorposts are primarily intended for use with valves controlling water supplies to sprinkler, deluge, water spray,foam, and standpipe systems used in private fire service where connections enter buildings.
1.2 Requirements for the installation and use of the indicator posts covered by this standard are includedin the following Standards of the National Fire Protection Association:
a)NFPA 11, Low Expansion Foam and Combined Agent Systems;
b) NFPA 13, Installation of Sprinkler Systems;
c) NFPA 14, Installation of Standpipe and Hose Systems; and
d) NFPA 24.Installation of Private Fire Service Mains.
2 Components
2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with therequirements for that component.
2.2 A component is not required to comply with a specific requirement that:
a) lnvolves a feature or characteristic not required in the application of the component in theproduct covered by this standard, or
b) ls superseded by a requirement in this standard.
2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse
2.4 Specific components are incomplete in construction features or restricted in performance capabilitiesSuch components are intended for use only under limied conditions, such as certain temperatures notexceeding 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 orapproximate information.
4Undated References
4,1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.
CONSTRUCTION
5 Barrels
5.1 The walls of a barrel shall be made of material having physical and corrosion resistant properties atleast equivalent to one of the following:
a) Gray iron extra-heavy soil pipe (0.25 inch nominal thickness) in accordance with theStandard Specification for Cast lron Soil Pipe and Fittings, ASTM A74, for either the upper orower barrel;
b) Minimum 0.21-inch thick ductile iron in accordance with the Standard for Ductile lron PipeCentrifugally Cast, for Water, ANSI/AWWA C151/A21.51, for either the upper or lower barrel;
c) Schedule 40 sfeel pipe for either the upper or lower barrel in accordance with StandardSpecification for Pipe, Steel, Black, and Hot-Dipped, Zinc-Coated, Welded and Seamless,ASTM A53, and the Standard Specification for Electric-Resistance-Welded Steel Pipe, ASTMA135;
d) Class 200 polyvinyl chloride (PVC) pipe in accordance with the Standard for PolyvinylChloride (PVC) Pressure Pipe and Fabricated Fittings, 4 inch through 12 inch for WaterDistribution, AWWA C-900, for the lower barrel of indicator posts for underground use.
5.2 Ferrous materials having wall thickness less than those specified in 5.1 and provided with a protectiveinferior and exterior coafing may be used when determined to be equivalent using comparative corrosionanalysis.
5.3 The inside diameter shall be nominally 4 inches (102 mm) at any point throughout its length. Theinside diameter at the bottom of the lower part shall be not less than 8 inches (203 mm) over the lengthrequired to provide for clearance to the valve bonnet when attached to the valve flange.