External pressure test method and device for marine watertight air duct

According to the external pressure test method and device for the marine watertight air pipe, the defect that the watertight air pipe external pressure test method is lacked in the prior art is overcome, the bearing capacity of the watertight air pipe to the external pressure is tested through the external pressure test, and it is guaranteed that water flow cannot flow into the watertight air pipe from the outside of the watertight air pipe; the reliability of the watertight air duct can be verified; in addition, the watertight air pipe with the rectangular cross section is selected for the test, so that the manufacturing cost and the weight of the watertight air pipe can be controlled, the construction difficulty can be reduced, and the working efficiency can be improved on the basis of ensuring the use performance. 本发明提供一种船用水密风管的外压试验方法及装置，弥补了现有技术中缺少水密风管外压试验方法的不足，通过外压试验来检验水密风管对外部压力的承受能力，保证水流不会从水密风管的外部流入其内部，更能验证水密风管的可靠性；另外，试验选用横截面为矩形的水密风管，能够在保证使用性能的基础上，控制水密风管的制作成本和重量，降低施工难度，提高工作效率。