How to determine the length of waterproof casing?

The inner and outer diameters of the casing and the outer diameter of the flange are specified, what kind of steel pipe is worn inside and the indicators of the steel pipe are also standardized, which is clearly specified in the above atlas of waterproof casing.
 
And the length can be set according to the needs of the project, generally for special projects to determine the length of the extension, mainly based on the thickness of the wall decision.
 
Huanzhong production of flexible waterproof casing length is relatively long 1500mm and 2000mm, mainly according to the actual needs of customers, for example, two walls need to use a waterproof casing to install, it is necessary to follow the special requirements to produce custom, 02s404 waterproof casing atlas is in accordance with the 300mm wall thickness to explain, but in the actual construction may not be All standard wall thickness, so the length is based on the design requirements of the project and the thickness of the wall is decided.
 
In addition, Huanzhong's waterproof casing is mainly made of carbon steel seamless steel pipe, which effectively improves the reliability of the pipe through the wall in the application process.
 
The use of automatic welding machine combined with T42 welding rod can effectively ensure the combination of waterproof wing ring and seamless steel pipe after welding is completed, which greatly improves the pressure resistance of rigid waterproof casing.
 
It can be better used in pre-buried concrete projects. The epoxy resin layer is sprayed on the outside, which can effectively ensure that it is not affected by the environment in the process of use, and always maintains the anti-corrosion of the seamless steel pipe on the outside.
 
Especially, the improved epoxy resin layer can be better used in the humid and corrosive environment.