SEC is a manufacturer of pressure vessels that are built in accordance with the requirements of the ASME Boiler and Pressure ... Vessel Code. We hold the U, U2, and R certificates. We are certified with A2 rating by the Center Special Equipment Licensing Office (SELO) of the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) of the Peoples Republic of China to manufacture pressure vessels for import to China. Our company holds a certificate with the National Board of Boiler and Pressure Vessel Inspectors. read more