The difference between the rigid waterproof and flexible waterproof casing pipe
Rigid waterproofing casing is a steel tube with wing ring (made of steel ring set on the steel pipe), which are installed in the wall (mostly concrete wall) and used for general pipeline wall, conduciving  to wall waterproof;
Flexible waterproof casing in addition to the outer ring, internal gear ring, such as the flanges silk, has a complete set of sell, also can own processing, used to have a shock to line, such as pump and connecting pipe wall.
Mainly use place is difference in two products.Flexible waterproof casing mainly USES in the wall of civil air defense, demanding places, such as cistern rigid waterproofing casing pipe should be such as to pipe in the basement is commonly used in position.Since the underground household pipeline in building external wall should be equipped with rigid waterproofing casing.Through walls (the casing of the pool, plate, etc.).Divided into two kinds of rigid and flexible.After the installation is allowed - flexible deformation;There is no deformation, rigid.
Steel flexible waterproof casing:
1, the image dimensions are in millimeters to gauge.
2, flexible waterproof casing, generally through the wall of the vibration or tight waterproof requirement of structures. 
Part 3, casing processing is completed, both in its outer wall paint primer again (primer ZhangDan or cold priming oil).The outer corrosion is determined by the design. 
4, the wall of the casing wall, in case of the concrete wall should be switched to the concrete wall, the scope of concreting shall be colorful ring (D6) 200 mm in diameter, and must be poured casing solid and walls.
5, wear in the concrete wall thickness shall be not less than 300 mm otherwise should be made on both sides of the side wall thickening or upset.Increasing the diameter of the part minimum colorful ring (D6) 200 mm in diameter
6, according to the wall thickness is the casing material weight L value is 300 mm should be calculated separately.
7, casing parts welding material, made of A3 material, T42 welding.