2.7 Fire Hydrants
2.7.1 General Fire Hydrant Requirements & Specifications
A. Specify fire hydrants manufactured by American Darling, Model B-62-B; Kennedy Valve, Model K-81-A; or Mueller, Super Centurion 250.
B. Hydrant valve opening shall be at least 5-inch diameter, net. Inlet connection shall be 6-inch mechanical joint with accessories (glands, plain rubber gaskets, and stainless steel bolts and nuts).
C. Hose connections shall consist of two 2 1/2 -inch diameter hose connections with National Standard Threads (NST) with threaded caps and one 5-inch diameter integrated Storz connection with a ¼” bleed off/pressure relief valve.
D. Operating nut shall be 5 sided, 1 5/16 inches from point to flat, and shall turn left (counterclockwise) to open.
E. Outer casting shall be one-piece cast iron, designed to permit its extension without excavating.
F. Hydrant design shall be such that when the barrel is broken, it may be replaced without excavating or breaking adjacent pavement; that the entire barrel, including all working parts, along with the main and waste valve seats, may be removed for inspection or repair without excavating or disturbing the ground; and that underground flanges with bolts and nuts are eliminated.
G. The main valve seal shall be compression type sealing against a bronze seat and the valve shall open against pressure.
H. Between elbow and top cap, the barrel shall be made in two parts connected by a swivel segment to permit facing the nozzles in any direction.
I. Bonnet shall be bolted to the standpipe and shall have cast on the top an arrow and the word “Open” indicating the direction for opening.
J. For ramp-side hydrants, Fire Hydrant shall be set within a gravel or crushed stone drainage, well extending the full width of the trench.
K. Where hydrants are to be relocated, the Contractor shall ascertain whether or not the hydrant valve has been restrained before removing the hydrant to be relocated. The lead pipe shall be capped and blocked so that service can be restored to the parent main pending the removal or plugging of the mainline tee.
L. The outside of all fire hydrants above the breakaway flange shall be painted with two coats of OSHA orange industrial enamel paint, as manufactured by Sherwin Williams, or equal. The riser pipe from ground to breakaway flange shall be painted with two coats gloss black industrial enamel paint as manufactured by Sherwin Williams, or equal before installation. The Hydrant bonnet shall be painted to indicate its gallons per minute (GPM) per NFPA 291.
M. International Symbol Signs meeting the requirements of NFPA 170 shall be attached on the Terminal siding located 10 feet above the ramp side fire hydrants, each as a 10” by 10” white on red reflective symbol sign. (See attached NFPA 170 Fire Safety Symbols).
N. All fire Hydrants at Martin State Airport shall be designed and installed in accordance with the Baltimore County Fire Department specifications and NFPA-24, The Installation of Private Service Mains And Their Appurtenances.
O. All fire Hydrants at BWI Marshall Airport shall be designed and installed in accordance with NFPA-24, The Installation of Private Service Mains And Their Appurtenances.
2.7.2 Underground Fire Hydrants (Aircraft Loading Areas)
Underground fire hydrants are not permitted. Exceptions shall require Office of the Fire Marshal approval.
Flush type fire hydrants shall be Mueller A-415 or approved equal with a 5 sided 5/16” operating nut, two 2½” diameter hose connection (with National Standard Threads) and a 5” diameter Storz pumper connection with a ¼” bleed off/pressure relief valve.
Consultant shall provide details for a reinforced concrete structure around the underground fire hydrant. The cover shall be 36” x 36” Model HLC-4 by Bilco or equal, suitable for aircraft loading. Structure shall have a door with flush mounted hinges and stainless steel hardware, spring cushion operators, and hold open arm. Cover shall be painted red with a white Fire Hydrant Symbol, which is a minimum 2 feet long, painted to match the NFPA 170 Figure 4-2.5.
2.7.3 Construction Phasing for Fire Hydrants and Water Mains
In accordance with Title 29 06.01, State Fire Prevention Code, the following applies to new construction: Section 41-2, Fire Safety During Construction, subsection 41-2.3.2, Water Supply – “Where underground water mains and hydrants are to be provided, they shall be installed, completed, and in service prior to construction work.” Office of the Fire Marshal will allow the pad to be installed and the steel to be erected prior to the underground water mains and hydrants being in service.