UL 246:2018 pdf download.Hydrants for Fire-Protection Service.
8.7 The effective gasket sealing cameter is located at the midpornt between the inside and outside diameters of the gasket contact surfaces.
8.8 The effective stress area for non-circular gasket contact surfaces or for gaskets or joints whose
geometry varies from those described above shall be determined using the gasket seating area based on
a sealing boundary using the appropriate gasket seating width according to Tables 2-5.1 and 2-5.2 of the
ASME Boiler and Pressure Vessel Code Vlll.1,
9 Inlets
9.1 The base of the hydrant, known as the fool piece or elbow, shall be made of material having strength. rigidity, and resistance to corrosion equivalent to cast-iron. It may have either a side or bottom inlet which shall be provided with a bell, flange, or other type of acceptable joint or end for connecting the hydrant to the branch from the mam. Ends shall conform to Standards for Pipe Flanges and Fittings, ANSI A21.10, ANSI A21.11, ASME B16.1, and ASME B16.1O.
9.2 The inlet shall be suitable for connection to not less than a 6 NPS.
10 MaIn Valves for Base Valve Hydrants
10.1 The net area of the waterway of the barrel and footpiece at the smallest part shall be not less than 120 percent of that of the net opening of the main valve. The area of the net opening of the main valve is the area of the waterway, when the valve is wide open, between the valve face and seat ring, based on the internal diameter of the ring and corrected for the presence of guiding vanes andlor drain valve mechanism. In no case shall the diameter of the main valve opening be less than 4 inches (102 mm).
10.2 The hydrant main valve, when shut, shall remain closed and tight against leakage in case of damage or breakage of the upper portion of the barrel of the hydrani
10.3 The construction of the hydrant shall be such that the main valve and Its movable parts, as well as the movable parts of the drain valve, can be removed from the assembly of an installed hydrant without excavating the hydrant.
8.8 The effective stress area for non-circular gasket contact surfaces or for gaskets or joints whose
geometry varies from those described above shall be determined using the gasket seating area based on
a sealing boundary using the appropriate gasket seating width according to Tables 2-5.1 and 2-5.2 of the
ASME Boiler and Pressure Vessel Code Vlll.1,
9 Inlets
9.1 The base of the hydrant, known as the fool piece or elbow, shall be made of material having strength. rigidity, and resistance to corrosion equivalent to cast-iron. It may have either a side or bottom inlet which shall be provided with a bell, flange, or other type of acceptable joint or end for connecting the hydrant to the branch from the mam. Ends shall conform to Standards for Pipe Flanges and Fittings, ANSI A21.10, ANSI A21.11, ASME B16.1, and ASME B16.1O.
9.2 The inlet shall be suitable for connection to not less than a 6 NPS.
10 MaIn Valves for Base Valve Hydrants
10.1 The net area of the waterway of the barrel and footpiece at the smallest part shall be not less than 120 percent of that of the net opening of the main valve. The area of the net opening of the main valve is the area of the waterway, when the valve is wide open, between the valve face and seat ring, based on the internal diameter of the ring and corrected for the presence of guiding vanes andlor drain valve mechanism. In no case shall the diameter of the main valve opening be less than 4 inches (102 mm).
10.2 The hydrant main valve, when shut, shall remain closed and tight against leakage in case of damage or breakage of the upper portion of the barrel of the hydrani
10.3 The construction of the hydrant shall be such that the main valve and Its movable parts, as well as the movable parts of the drain valve, can be removed from the assembly of an installed hydrant without excavating the hydrant.
