(a) Standpipe systems shall be equipped with approved outside Siamese connections having check valve clappers in each inlet. The pipe from the standpipe system to any Siamese connection shall not be less than four (4) inches in diameter.
(b) Not less than one (1) Siamese connection with two (2) two and one-half (2-1/2) inch inlets and one (1) four (4) inch outlet shall be provided for each six (6) inch standpipe riser and not less than one (1) such connection for each two (2) four (4) inch risers or fraction thereof. However, not more than four (4) Siamese connections shall be required for any building. Not less than one (1) Siamese connection shall be provided on each street frontage of a building when there are more than two (2) standpipe risers within the building. When a building fronts on only one (1) street and the standpipe system is required to have more than two (2) Siamese connections, such connections shall be distributed along the accessible exterior walls of the premises at such locations as the Fire Chief may direct.
(c) Siamese connections shall be placed not less than eighteen (18) inches nor more than thirty-six (36) inches above the adjoining grade level.
(d) Siamese connections shall not project beyond the street or alley line except when installed on existing buildings under the provisions of Section 389.13(b).
(e) Inlets on Siamese connections shall have female threads conforming to Fire Division standard. Substantial caps to protect the threads shall be provided on each inlet.
(f) Just inside the building from each Siamese, in a horizontal section of the standpipe connection, an approved straightaway check valve shall be placed with an automatic drip valve between the check valve and Siamese to drain the connection to the Siamese and prevent damage due to freezing.
(g) Each Siamese connection shall be suitably marked with an approved durable sign indicating use, i.e., “TO WET STANDPIPE” or “TO DRY STANDPIPE.”
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)