Ratings for standard seamless stainless steel pipes, temperatures ranging 100oF to 750oF. All ratings in psig based on ANSI/ASME B 31.1. When design the helical coil for heat exchange, please check the working pressure for the coil and make sure you have choosed the proper pipe size for your application. If you have any question, please contact us. Lizheng Stainless Steel Tube & Coil Corp have the most professional engineer to give you the best technical support.