Heres a general guide to what might be the specification for MS pipes of a certain size
Nominal Bore NB This typically refers to the internal diameter of the pipe The term 23 lines might refer to a nominal size like DN Diameter Nominal or NB
Pipe ScheduleThickness The schedule refers to the wall thickness of the pipe The most common schedules for MS pipes are Schedule 40 80 or 160
Material Grade The standard material for MS pipes is usually IS 1239 Part 1 which is a widely adopted standard in India or ASTM A53 for international usage The material grade is usually Fe 410 or Fe 250 for MS pipes
Length MS pipes come in standard lengths typically 6 meters or 12 meters though custom lengths can be produced as well
Pressure Rating MS pipes can be designed to carry different pressure levels depending on the schedule and size For example Schedule 40 pipes are designed for low to medium pressure applications