MILL CONSTRUCTION BUILDINGS 



"Windows may be of small area, but should be placed high in order 

 to give the best light. 



Protection A standard equipment of automatic sprinklers should be in- 

 stalled throughout. In mild climates, and even under some 

 conditions in cold ones, it is advisable to install a line of l^-inch steampipe 

 overhead on each floor to provide sufficient heat to avoid freezing of the 

 water in the sprinkler-pipes. If the building is not heated an air system with 

 water controlled by an approved dry-pipe valve must be used, and all pipes 

 must have 1/2-inch pitch per 10 feet back to main riser to insure proper 

 drainage. A dry-pipe valve chamber may be located in the basement of the 

 stair tower. The number of sprinklers in one dry-pipe valve should prefer- 

 ably not exceed 300, and 400 is the maximum allowed under the rules. 

 By heating the storehouse the expense of installation and maintenance of the 

 dry-pipe system is avoided, and in buildings of this substantial character 

 only a very small amount is needed, as it is only necessary to keep the 

 temperature above the freezing point. 



Standpipes "Standpipes are often advisable in the stair towers of the 

 higher storehouses, and provision should be made below frost 

 for draining them in cold weather, with a readily accessible indicator post 

 gate for controlling the supply in case of emergency. 



"Water supply to the sprinklers and standpipes, as well as for such 

 outside hydrants as may be needed should be of good capacity from two 

 independent sources." 



Page forty-seven 



