What Is Flexible Metal Conduit?

Flexible waterproof casing is suitable for the hardware fittings of the structure where the pipeline passes through the wall subject to vibration or strict waterproof requirements. General manufacturers are manufactured according to the S312, 02S404 standard atlas developed by the Institute of Building Science. Flexible waterproof casing wall through the wall, if it is not concrete, you should use concrete walls, and the casing must be solidified in the wall at one time; flexible waterproof casing is widely used in construction, chemical, steel, tap water, sewage treatment And other units.

Generally, a casing is used when making a pool. It is a pipe leading to the pool.

1. When the water front is a corrosive medium, the sealing material can be used to seal the gap.

According to the standard atlas can be divided into: national standard and non-standard. The national standard waterproof sleeve refers to the material selection and production according to the 02S404 or 02S312 standard atlas related to the Ministry of Construction. It has strict requirements on flange thickness, wing ring thickness, pipe diameter and thickness. The non-standard is that when the shape and approximate structure meet the standard atlas, the flange thickness, flange thickness, pipe diameter and thickness are considered to be relaxed when selecting materials. Strictly speaking, these are unqualified products. Of course, it must be To a certain extent, the relaxation of standards will not affect the use, but excessive relaxation of standards will affect the performance.

According to the atlas, it can be divided into: S312 type flexible waterproof casing and 02S404 type flexible waterproof casing. Both of them are different in shape and structure.

Due to the non-standard competition in the market, flexible waterproof sleeves are currently divided into two types: national standard and non-standard. National standard refers to the selection and production of materials according to the relevant 02S404 or 02S312 standard atlas related to the Ministry of Construction. There are strict requirements for the wall thickness. Made to design standard size. Non-standard means that in addition to the shape and approximate structure in accordance with the requirements of the atlas, the flange thickness, the thickness of the wing ring, the diameter of the pipe and the thickness of the pipe wall to make the difference, thereby reducing weight and cost. Strictly speaking, these are unqualified products. Of course, a slight difference in thickness and wall thickness can reduce the engineering cost and not affect the use, but it will affect the performance to a certain extent. ^[3]

1. When the water front is a corrosive medium, the gap can be blocked by using a blocking material.

2. If non-concrete walls are encountered at the casing penetration wall, concrete walls should be used instead. The pouring range should be 200 larger than the diameter of the wing ring (D5), and the casing must be poured on the inner wall at one time.

3. The thickness of the concrete wall through the wall should not be less than 300, otherwise the wall should be thickened on one or both sides, and the diameter of the thickened part should be at least D5 + 200.

4. The weight of the casing is calculated by L = 300. If the wall is more than 300, it shall be calculated separately.

5. Flexible filler material: asphalt hemp, polystyrene board, polyvinyl chloride foam board.

6, sealing paste: polysulfide sealing paste, polyurethane sealing paste.

7. The dimensional tolerance of the welding structure is in accordance with JB / T5000.3-1998. Welding uses manual arc welding, electrode type E4303, grade J422. The basic shape and size of the weld groove must be in accordance with GB985-88.

8. When the casing is made of rolls, the allowable deviation of Zhou factory is: D2600, D2> 600 ± 0.0035D2.

DN15mmDN3200mm.

Flexible waterproof casing is generally suitable for structures where the pipeline passes through the wall subject to vibration or strict waterproof requirements; rigid waterproof casing is generally suitable for structures where the pipeline passes through the wall requiring general waterproofing;

Flexible and rigid waterproof casings pass through walls. If non-concrete is used, concrete walls should be used instead, and the casing must be solidified in the wall at one time; waterproof casings are used in construction, chemical, steel, tap water, sewage treatment and other units. .

Rigid waterproof casing is a steel pipe plus a wing ring (annular sleeve made of steel plate is placed on the steel pipe), and it is installed in the wall (mostly concrete wall). The wing ring, there are retaining rings and the like, the flange inner wire is sold in sets, or it can be processed by itself for pipes that need shock absorption, such as pipes connected to water pumps through walls. That is to say, if the waterproof performance of both sides of the wall is considered, a flexible waterproof sleeve should be selected; if only the wall penetration of the pipeline is considered, and the waterproof performance of the two sides of the wall after the wall penetration and the displacement and deformation of the pipeline are not considered, Can choose rigid waterproof sleeve.

Rigid waterproof casing is suitable for structures (buildings) that do not bear pipeline vibration and expansion deformation at the place where the pipeline passes through the wall. It is suitable for the space where the pipeline passes through the wall is limited or the pipeline installation precedes the structure (building) or pipeline renewal. For areas with seismic fortification requirements, if a steel waterproof sleeve is used, a flexible connection should be set up near the pipeline that enters the pool wall or the external wall of the building. Type A is suitable for steel pipes, and Types B and C are suitable for ductile iron pipes and cast iron pipes ^[3]

1. Flexible waterproof casing is generally suitable for structures where the pipeline passes through the wall subject to vibration or strict waterproof requirements.

2. The wall where the casing passes through the wall should be replaced with a concrete wall when it encounters a non-concrete wall. The total casting area should be 200mm larger than the diameter of the wing ring, and the casing must be cast into the wall at one time.

3. The DN size and wall thickness size in the table can be produced according to user requirements. Please specify the diameter, outer diameter of the tube and wall thickness when ordering.

1. The dimensions in this figure are in millimeters.
2. The flexible waterproof casing generally passes through the wall and is subject to structures subject to vibration or strict waterproof requirements. 3. After finishing the processing of the casing part, apply primer to the outer wall (primer includes camphor or cold base oil). Outer corrosion protection is determined by design.
4. If the wall of the casing passes through the wall, it should be replaced with a concrete wall if it encounters a non-concrete wall. The pouring concrete range should be 200mm larger than the diameter of the wing ring (D6), and the casing must be cast in the wall.
5. The thickness of the concrete wall where the pipe is passed should not be less than 300mm, otherwise the wall should be thickened on one or both sides. The diameter of the thickened part should be less than the diameter of the wing ring (D6) 200mm
6. The material weight of the casing is calculated according to the wall thickness L value of 300mm.
7. Welding materials for casing parts, made of A3 material, T42 welding ^[3] .