ASTM A312 PIPE SCHEDULE 10 AND SCHEDULE 40

ASTM A312 is a specification for seamless and welded austenitic stainless steel pipes that perform well in high temperature and corrosive environments. The common grades for this specification are 304/304L and 316/316L.The pipe Schedule describes the pipe wall thickness. With an increase in pipe schedule number pipe thickness increases. The main function of the pipes is to carry fluid (liquid, gas, fluidized solids, slurry, mixed-phase products, etc) under pressure (internal, external, or both), therefore to sustain the fluid pressure the pipe has to be strong enough to perform its intended duty without failure.  Obviously, for pipes containing pressurized fluids the wall thickness, and by implication the pipe’s strength, is the most important parameter. Wall thickness of Pipe is expressed by “schedules or Schedule numbers“, referred to as pipe schedules or Piping Schedules.