[introduction] certificate u2 is a certificate authorized by the american society of mechanical engineers (asme). since august 1997, the company has obtained the asme non-nuclear pressure vessel manufacturing certificate, and established the quality assurance system according to the asme standard issued by the american society of mechanical engineers (asme). the application scope of this certificate is to manufacture pressure vessels (according to asme section viii, division ii). the renewal period of this certificate is 3 years. this certificate authorizes cfhi to manufacture pressure vessels in accordance with the requirements of asme standard and quality system according to the specified scope. this manufacturing qualification is maintained continuously since it was obtained.