18 



Loss of Heat from Covered Steam Pipes 



^ 



I 



l< 



50 



100 



150 

 Steam Pressure. 



200 



860 



than for small ones. The usual practice of the manufacturers of 

 pipe coverings is directly opposed to this, and there are very good 

 reasons for their course. 



In the first place the cost of a large pipe line warrants the 

 expenditure of sufficient money on the covering to have it of a 



Steam Pressure. 



liberal thickness, and thus to secure a low heat loss. Secondly 

 the bulk of the small pipes would be very objectionable in many 

 cases if they were so thickly covered and the expense of cover- 

 ing would be out of all proportion. 



