Carbon slip on flange refers to a kind of flange connected with the vessel or pipeline by fillet weld. It is an arbitrary flange. During the design, according to the integrity of the connection between the flange ring and the straight cylinder section, it
Openable roof film greenhouse is a new type double layer greenhouse, it is combined the advantages of general greenhouse, shading house, net house, and use folding flexible covering material prevent rain and wind. Companied with shading system, the greenh