There are many types of steel pipes such as Spiral Steel Pipe, Pile Pipe, API Spiral Steel Pipe, LSAW Steel Pipe, API LSAW Steel Pipe, Piling Tube, ERW Steel Pipe, etc. When you are first looking to source a stainless steel pipe, whether it's for a desalination plant, an oil rig or even a nuclear power station, one of the first questions you need to ask yourself is "do I need a seamless, welded or forged pipe"? The three types all have different advantages and are therefore suited to different applications and environments. http://www.hpsteelpipe.com/spiral-steel-pipe/