Without knowing the purposes for your application I can say that API 5L Gr B can be used at temperatures above 0ºC up to 200ºC. If your process work is in the brittle zone bellow 0ºC down to –50ºC you should use ASTM A333 Gr 3 with a minimum impact test temperature of –101ºC. A 333 Gr B can be used in services bellow 0ºC down to 100ºC. Luis Marques

Sak i agree with MJC on this. The fact that the piping designer is suggesting A 333 - may be on considerations of sudden impact load considerations at sub zero temperature. For such unforeseen impact load, A 333 would be better than A 53 or A 106 Grades. Trust this is of help to you C.V.Srinivasan Nishi Engineers Pvt Ltd India April 29 E-mail: nishi@hathway.com >sak, > >The best source of information about allowable temperature >ranges for various piping materials is the ASME Power and >Chemical process piping codes........ASME B31.1 and B31.3 > >API 5L Grade B is carbon steel material and, as I recall, >has a temperature range similar to A53/A106 grade B ( -20F >to +750F) > >A333 Grade B has a larger acceptable range ( as i recall... >to -50F....but you should check the code). A333, of course, >is a little more expensive. > >Your low temperature service....only to 0 degrees C may >allow either material. > >However, piping system design is not just material >selection......many other factors must be included to >achieve a well engineered piping system. > >What liquid is being transported and what is the pressure >range required ??? > > >MJC