. The principles of mill and factory inspection for fire insurance purposes : with notes on the hydraulics of automatic sprinkler protection . e other conspicnons place, to show exactlywhich gate valve is closed. All gate valves are numberedfor quick identification and on this board is a hook forevery gate valve, with the number underneath. The tell-tale tag stays on the proper hook until the closed gatevalve has been opened. Hose Connections.—Small hose is sometimes per-mitted to be connected to automatic sprinkler piping andis handy for both wetting down material inside of build-ings after a
. The principles of mill and factory inspection for fire insurance purposes : with notes on the hydraulics of automatic sprinkler protection . e other conspicnons place, to show exactlywhich gate valve is closed. All gate valves are numberedfor quick identification and on this board is a hook forevery gate valve, with the number underneath. The tell-tale tag stays on the proper hook until the closed gatevalve has been opened. Hose Connections.—Small hose is sometimes per-mitted to be connected to automatic sprinkler piping andis handy for both wetting down material inside of build-ings after a fire has been extinguished by automaticsprinklers and for throwing water on fires which cannotbe reached by the nearest automatic sprinklers becauseof obstructions to the distribution of water from the auto-matic sprinklers. Loss of Pressure.—There is a constant loss of pres-sure in water pipes due to friction between the water andthe inside surface of the pipes. This is also true of in pipes, fittings, valves, etc., all tend to reducethe pressure under which water is flowing through them. APPROVED AUTOMATIC SPRINKLERS H. THE NIAGARA, ISSUE B Automatic Sprinkler Company of America,New York City. 74 MILL AND FACTORY INSPECTION These losses of pressure can be considerably reduced bythe use of smooth piping, long bend fittings, minimumnumber of valves, etc. One-Supply Elquipments.—Automatic sprinklerequipments with one water supply are better than none,provided the one water supply is ample and reliable, butthey cannot be considered standard (see Water Supplies,Number of). The exceptions to this rule are automaticsprinkler equipments having a steel pressure tank as awater supply and a connection with a central station for fullsupervisory service (A. D. T. supervisory service). Whenan old building is not strong enough to support a gravityroof tank, and a tank cannot be placed on a trestle builtup from the ground, a good water supply may be obtainedfrom a public st
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