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Forge blowers:

Air Pressures and Pipe Sizes for Forges

Blacksmiths' forges require air pressures varying from 1½ to 6 ounces per square inch. Small forges with the blower close to them are adequately supplied with 1½ ounce pressure. It the blower is some distance away and a long discharge pipe with many bends leads to the forge, even though the later be small, it may be necessary to carry 3 ounces pressure or more, to overcome friction in the air ducts. Large forges usually require from 3 to 6 ounces pressure. The table "Air Pressures and Pipe Sizes for Forges," gives the diameters of discharge mains for various tuyere sizes and numbers of forges.

Air Pressures and Pipe Sizes for Forges

Diam.
Forge
Tuyere,
Inches
Number of Forges Supplied by Blower
 1   2   3   4   5   6   7   8   9   10 
Diameter of Discharge Main at Blower, Inches
 3/4   1½   1½   2   2   2½   2½   3   3   3   3 
 1   1½   2   2½   3   3   3½   3½   4   4   4 
 1¼   2   2½   3   3½   4   4   4½   5   5   5 
 1½   2   2½   3   3½   4   4½   5   6   6   6 
 1¾   2½   3½   4   4½   5   6   6   7   7   7 
 2   3   4   4½   5   6   7   7   8   8   8 
 2¼   3   4   5   6   7   7   8   9   9   9 
 2½   3½   5   6   7   8   8   9   9   10   10 
 2¾   4   5   6   7   8   9   10   10   11   11 
 3   4   6   7   8   9   10   11   11   12   12 
 3½   4½   7   8   9   10   11   12   13   14   14 
 4   6   8   9   11   12   13   14   15   16   17 
American Blower Company

MACHINERY'S HANDBOOK 5th Ed., Industrial Press, 1914 - Today's article is similar or the same.

Blowers sold by
Kayne and Son
 CFM  oz/sqin Outlet Amps
65 14    
112 36    
164 40    
400 74    
 
Buffalo Forge Catalog
Forge size Fan Dia.
Inches
   
18" Dia. 6"    
25" Dia 8 - 10"    
21 x 27" 10"    
28 x 40 14"    
N/A 17"    


References and Links


2002 Jock Dempsey, www.anvilfire.com


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