01

Excellent physical and mechanical properties

As a water supply and gas transmission pipeline, the steel plastic composite pressure pipe has higher strength, rigidity and impact resistance than the strength of plastic pipe, and has low expansion coefficient and creep resistance similar to steel pipe. The buried pipe can bear much more external pressure than the full plastic pipe, and the tensile strength is as high as 275 ~ 320MPa, which is 7 ~ 8 times that of pure plastic pipe; Riser of high-rise building: strong verticality, not easy to deform due to environmental factors. The pure plastic riser will be deformed due to many factors because of its poor rigidity, creep resistance and impact resistance.

02

Low thermal conductivity and good thermal insulation performance

Thermal conductivity: 0.46-0.57 (w / m.k), with good thermal insulation performance, about 1 / 100 of that of steel pipe, close to the thermal conductivity of plastic pipe, but several times higher than that of thermal insulation material, with excellent thermal insulation performance. At present, polyurethane directly buried insulation pipe system is adopted for urban central heating in China, which is divided into three layers from inside to outside; The first layer: working steel layer, the second layer: polyurethane insulation layer, and the third layer: high density polyethylene protective layer. In the new steel plastic composite pipe used in the central heating pipeline system in the north, PE RT is selected as the plastic layer, and the composite pipe is covered with a layer of thermal insulation material. The inner wall of polyurethane directly buried ground insulation pipe is steel, and the inner wall of steel plastic (PSP) pipe is plastic layer, which makes the insulation effect of steel plastic (PSP) pipe better than that of polyurethane directly buried ground insulation pipe, and because the roughness of plastic is much lower than that of steel, the heat loss in the transportation process is smaller.

03

Small expansion coefficient

The steel plastic composite pressure pipe has a small linear expansion coefficient, which is conducive to be used as the main water transmission pipeline, and can greatly overcome the defect that the plastic pipe has a large linear expansion coefficient and can not be used as the main water transmission riser. The linear expansion coefficient is 1.2 ~ 10x10 - 5 / * C, which is close to the expansion coefficient of 1.1 ~ 1.2x10-5 / * C just now. The linear expansion coefficient of pure plastic is 14 ~ 16x10-5 / 9C

04

Small resistance coefficient

Because the inner wall of steel plastic (PSP) composite pressure pipe is a plastic layer, its roughness is lower than that of ordinary metal pipe, the inner wall is smooth, when conveying fluid, the resistance loss is small, and there is no scaling. Under the same pipe diameter and pressure, the water flow is 20 ~ 30% greater than that of galvanized pipe, and larger transmission flow can be obtained. The structure integrates rigidity and flexibility, which can quickly eliminate the pressure impact in the pipeline system and does not produce water hammer noise.

05

Excellent corrosion resistance

Polyethylene (propylene) material is a non-polar material, which can resist the corrosion of various acid, alkali, salt and other solutions. The inner and outer layers of steel plastic (PSP) composite pressure pipe are plastic, the middle is reinforced by argon arc welded steel pipe, and the metal layer is sealed by core layer plastic sealing technology. The pipe and pipe fittings are connected by double hot melting to ensure that the metal layer on the end face of the storage material is not corroded.

06

Stable pressure bearing performance

The bearing strength of steel plastic composite pressure pipe is designed according to the welded steel pipe, and the bearing capacity of the pipe is not affected by the performance change of the plastic layer; The mechanical strength of polyethylene (propylene) pipe is greatly affected by temperature. Within its allowable temperature range, the short-term mechanical strength will be reduced by about 15% for every 10 ° C increase in temperature. Under high temperature, the creep speed will be accelerated and brittle fracture will occur in advance; In the design of pressure bearing strength of steel plastic composite pressure pipe, the pressure bearing effect of plastic layer in the pipe is ignored, and the temperature change will not reduce the pressure bearing capacity of the whole pipe.

07

Hygienic performance and safety

Steel plastic composite pressure pipe is hygienic and non-toxic, and the product meets the standard of gb17219. It can be used in drinking water supply system with high working efficiency.

08

Self tracing

Because the core layer of steel plastic composite pressure pipe is steel, it can be tracked by magnetic metal detector without embedding tracking or protection marks, which can avoid Excavation Damage and provide great convenience for rush repair and maintenance.

09

Good flexibility

The pipe can be bent, so that the adaptability and operation reliability of loading, unloading, transportation and installation are high. The underground installation can effectively bear the sudden impact load caused by settlement, sliding and vehicles. Fixed length single steel plastic composite pressure pipe can be bent in one direction, saving the amount of small angle steering elbow (when bending, the pipe weld shall be placed on the side of the bending arc). The bending radius of steel plastic composite pressure pipe shall be ≥ 5dn

10

Long service life

Plastic products are prone to aging due to heating, light, oxygen and other factors. The steel itself will not age. When the outer plastic of the steel plastic composite pressure pipe is aged, the steel plastic composite pressure pipe is designed under pressure The upper layer is mainly steel layer, supplemented by plastic layer, so it has little impact on the pressure bearing capacity of the pipe, the steel belt will not age, and the inner plastic pipe is not easy to age because it is protected by the steel pipe. Therefore, the service life of steel plastic composite pressure pipe is greater than that of steel pipe, which is equivalent to plastic pipe, and the service life is more than 50 years.

11

Good insulation

Plastic is an insulator. The insulation strength of polyethylene (propylene) reaches 380V / mm. The inner wall of steel plastic composite pressure pipe is a plastic layer structure, which can resist electric breakdown. Therefore, steel plastic composite pressure pipe has good insulation performance and can be used as cable protection pipe.

03

Double hot melt pipe fittings

Steel plastic composite pipe double hot melt pipe fittings and special tools

a) Insert the steel plastic pipe into the double hot-melt pipe fitting, and install and fix the steel plastic pipe (net).
b) The inner and outer plastic layers of steel plastic pipe and double hot-melt pipe fittings are melted into a body by hot-melt mold and special heating method; The hot melting time is 1 ~ 2 minutes, which can be adjusted according to the pipe diameter.
c) The special hot-melt equipment on site is small and light, easy to carry, low power consumption and high energy efficiency ratio.
d) The utility model has the advantages of simple installation, reliable connection and low price.