PERMAPIPE, Inc. entered the prefabricated piping market in 1961 to serve the specialty piping requirements of the district heating and cooling industry in North America . Since then we have grown to become the largest manufacturer of preinsulated piping systems in North America and an international market leader. We also manufacture secondary containment piping for environmental applications as well as oil and gas piping utilized for transfer line in deepsea oil line for the purpose of flow assurance. In September 1994, PERMAPIPE acquired RICWIL Piping Systems. RICWIL had been known as a brandname leader in the preinsulated piping industry for more than 84 years. The acquisition merged years of design expertise and proven products to meet our customers' needs. PERMAPIPE continues to offer the entire RICWIL product line. Our largest manufacturing facility is located on 25 acres near Nashville , Tennessee . At this plant, PERMAPIPE's skilled work force takes special care to provide systems of the highest quality, fabricated to jobspecific requirements and specifications. PERMAPIPE is an engineering company. We specialize in designing and manufacturing complete insulated piping systems to meet the specific requirements of the District Cooling and Oil & Gas industries.