52 



USEFUL TABLES 



DIMENSIONS OF PIPE FLANGES 



The table on page 51 gives the dimensions of standard and 

 extra-heavy pipe flanges, the former being the pressure up to 

 125 Ib. per sq. in., and the latter for pressures above 125 and 



STANDARD AND EXTRA-GAUGE STEEL BOILER 

 TUBES 



not over 250 Ib. per sq. in. The dimensions of flanges and fit- 

 tings were arranged by joint committees from the American 

 Society of Mechanical Engineers and the National Association 

 of Master Steam and Hot-Water Fitters, and after revision 

 and amplification were adopted by the latter body and officially 



