42 BUILDING AND EQUIPMENT 



For proper and economical insulation the following types of pipe 

 covering are recommended : 



Ammonia and Brine Lines. 



1st layer of tarred felt. 



2nd layer of 1" thick hair felt. 



3rd layer of tarred felt. 



4th layer of 1" thick hair felt. 



5th layer of tarred felt. 



6th layer of wove-felt paper. 



7th layer of 8-oz. canvas jacket, sewed on. 



8th layer of sizing and one coat of lead and oil paint. 



Each layer of hair felt must be securely wound with tw r ine. 

 Each layer of all material should be coated with hot asphalt, 

 applied while hot, excepting layers, 6, 7 and 8. 



Special seals must be made at all flanges and fittings, and 

 such flanges and fittings must be insulated independently. This 

 arrangement will prevent damage to adjoining coverings, should 

 fittings spring leaks. 



Before applying pitch or asphalt, the necessary precautions 

 must be taken to have the pipes thoroughly dry and the asphalt 

 or pitch must be hot. 



Steam Lines. Air cell asbestos covering, or covering of 

 equal insulating and lasting quality, one inch thick on pipes, 

 and fittings, to be built up of asbestos cement to a correspond- 

 ing thickness; smoothly finished and neatly canvassed, w r ith 

 metal bands at 18" intervals. Before putting on the metal bands 

 the covering should receive two coats of asbestos cold water 

 paint. 



Cold Water Lines. Covering of wool felt, tar paper lined, 

 sectional, one inch thick on pipes; fittings to be built up to a 

 corresponding thickness with one inch hair felt, the entire line 

 should be neatly finished with a graded mixture of Portland 

 cement and asbestos cement, and canvas-jacketed and equipped 

 with metal bands at 18" intervals. Before putting on the metal 

 bands, the covering should receive two coats of asbestos cold 

 water paint. 



Sanitary Arrangement of Machinery. Milk pumps, milk 

 pipes, milk troughs and other milk conveyors are, at best, ene- 



