1. Lined Pipe work is generally to ANSI B 31.3 with minor modifications to suit the lining process. 
 
2 S.G. Iron fittings with Cast on flanges are dimensioned to B 16.42. 

3 Tolerances for Pipe fabrication, flanges and fittings shall be as stated in the ASTM F 1545. 

4 Lined fittings (plastic flare to plastic flare) shall conform to the nominal centre-to-face dimensions as specified in relevant standards with the applicable tolerances. Dimensional details for each fitting are covered in the relevant Data Sheet available as a part of this specification.