1. The carat tube is a B-type wall tube with German equipment and skills, high-density polyethylene (HDPE) data as the material, surrounded and formed in the hot melt state, cooled by natural wind and released in cold state, which conforms to the GB/T19472.2-2004 rules. The hollow wall surrounding the pipe uses domestic equipment and skills, uses high density polyethylene material (HDPE) as the material, and surrounds the molding in the state of hot melting. The water-cooled A-type wall pipe conforms to the GB/T19472.2-2004 rules. In the process, the square tube is first extruded, then set after water cooling, and then encircled into a round tube, and then cooled by water.
Compared with the two, the advantages of the carat pipe，Below and HDPE pipe fitting suppliers together to understand.
1, the hot melt state surround, the structure wall inside and outside the wall synchronous surround, the whole pipe uniform, no weld.
2, the selection of air cooling, pipe in the forming heat storage is thoroughly emitted, will not constitute internal stress, not stratification and cracking.
3. Cold demoulding. When the pipe is cooled to room temperature, the mold shrinkage method is used for downloading, and the pipe will not be deformed.
By comparison, the defects of air traffic control are as follows:
1, there is an obvious weld, and the length is lengthy, the quality is difficult to control.
2, the rapid cooling of water, the heat is not uniform, the structure of the wall stress. When the control is not excellent, spring cracks frequently occur.
3. Outer wall lubrication can not effectively restrain the longitudinal displacement caused by the thermal expansion and cold contraction of PE data, which usually causes the stress gathering at both ends of the pipeline, destroying the connection between the joint or the pipeline and the inspection well, and constituting water leakage.
Second, the inertia distance of the carat pipe (HDPE around the B-type pipe) is continuously adjustable and the maximum value can reach 19.8, so the pipe ring stiffness is elevated, and the pipe above DN1500 can still produce more than 16KN/m2 pipe. And the hollow pipe (HDPE hollow wall surround pipe), the structure of the wall is extreme limited, the adjustable moment of inertia can only reach 5, can produce low ring stiffness of the pipe, the basic is 8KN/㎡, when the pipe is greater than DN1000, the ring stiffness is SN4(≥4KN/㎡).
Three, the carat tube (HDPE surround B type tube) in the production of product material function is extremely steep, so in addition to 2% of the color master, the remaining are HDPE data, thus the price is relatively low. The unit ring stiffness of the hollow pipe (HDPE hollow wall surround pipe) has additional consumables, so the cost is higher. But because the production equipment investment is tiny, the threshold is low, so there are more manufacturers, in the disorderly market competition, in order to gain an advantage in the cost, numerous choose inorganic substances (calcium carbonate) and recycled materials, so that the market price difference moment is large, and low.
Four, the Clara pipe (HDPE around B type pipe) is used to plug electric fusion connection (rigid interface), the interface part is used to plug and electric fusion two methods, to ensure the force of the pipe interface, but also to ensure the sealing of the interface. Carat pipe (HDPE surround B tube) to accept uneven can be extremely strong, and the construction method can be diversified. in the demand for rapid backfilling area, carat pipe (HDPE surround B tube) can be on the ground for multiple pre-welding, and then put into the groove. The hollow pipe (HDPE hollow wall surround pipe) is connected with the (electric) hot melt belt method. Due to the deformation of the pipe port, the (electric) hot melt belt cannot be fully bonded with the pipe. Therefore, it is necessary to weld in the groove during construction, which requires large earthwork excavation and moderate construction speed. (electric) hot melt belt connection, the force structure is poor, coupled with the pipe welding seam length, can not adapt to soft foundation or uneven settlement area laying.
Five, in the same raw materials of the carat pipe (HDPE surround B tube, B tube) and hollow wall surround tube (HDPE hollow wall surround tube, A tube) compared, in the skill of the B tube is better than the A tube, the application of the B tube is better than the A tube, under the same index, the two types of pipe material is similar, the normal price should be similar. The cost performance of type B tube is definitely better than that of type A tube.