GREENHOUSES 



Size of pipe Pounds of steam per hour 



1 y 2 inches 70 



2 " 138 



2/ " 220 



3 " 390 



3-^ " 570 



4 " 800 



4/ " 1000 



5 " 1400 



6 " 2200 



7 " 3200 



To find the size of supply pipe required it is 

 only necessary to determine the number of 

 pounds of steam condensed per hour by the 

 coils (approximately one-quarter pound for 

 every square foot of radiation) and from the 

 above table select the correct size. 



The following table, adapted from Carpen- 

 ter, gives the size of supply and return pipes 

 recommended to be used in the two-pipe sys- 

 tem for different amounts of radiation, 

 when a pressure of not greater than five 

 pounds is used. 



Sq. ft. of radiation 

 to be supplied Size of supply pipe Size return pipe 



200 \y 2 inch \% inch 



400 2 " \y 2 



700 ,...2y 2 " 2 



1000 3 " 2 



1600 y/ 2 " 2y 2 



2300 4 " 2y 2 



3200 A-y 2 " 2y 2 



