In practice, we found that it is very difficult to meet the design and construction specification requirements for large size pipelines such as DN80 or above. In actual construction for DNl50 and other pipelines, often the flange is installed, and then the number is made up and sent to the galvanizing plant galvanized, galvanized and then assembled, although this method meets the anti-corrosion requirements, but undoubtedly also increased the cost of production, but also extended the construction period. Because of construction difficulties, construction units sometimes directly use the method of connection, this operation is not standardized, and is also not allowed, we introduced this new process of galvanized steel pipe clamp connection, then overcome these shortcomings.
