Designed and constructed in accordance with ASME Section VII Div-I Code for compressed air storage use. "U" Stamped and registered with the National Board of Pressue Vessel Inspectors. Most designs inculde Canadian Registration Numbers (CRN, Please call us to check). Capable of building to American Bureau of Shipping (ABS) and United States Coast Guard (USCG) codes. Custom engineered designs available upon request (Please call us for a quote). Exterior surface painted with one coat standard shop primer. Special exterior and interior coatings available upon request. (Call for a custom quote)