Perforated Steel Strip Reinforced PE Pipe DN355-DN1000 Polyethylene Pipes

Large Diameter Perforated Steel Strip Reinforced PE Pipe (commonly designated as SRTP in international engineering, focusing on sizes DN355 and above) represents a revolutionary breakthrough in large-scale high-pressure pipeline technology. By combining the natural flexibility and corrosion resistance of High-Density Polyethylene (HDPE) with the high tensile modulus of an inner core perforated steel strip, this advanced composite pipe masterfully resolves the traditional engineering dilemma where large-diameter pipelines require excessively thick walls to withstand high pressures. For high-volume municipal water supply, long-distance transmission mains, mining slurry pipelines, and heavy industrial fluid networks, our DN355+ composite pipes deliver unparalleled pressure ratings and exceptional structural stability.

• High Pressure Rating with Thinner Pipe Walls: In ultra-large diameters, conventional solid-wall PE pipes must become extremely thick to handle high pressure, which severely restricts inner flow capacity and spikes material cost. Our perforated steel mesh design acts as a rigid armor skeletal core. This enables DN355+ pipes to easily maintain working pressures of up to 1.6 MPa, 2.0 MPa, or even higher, while keeping a optimized, thin wall profile that maximizes internal cross-sectional area and volumetric flow.

• Virtually Zero Creep Deformation Under Sustained Loading: Under permanent internal hydraulic stress, pure plastic large-diameter pipelines suffer from slow dimensional creep, causing swelling and structural aging. The mechanically locked internal perforated steel framework bears the dominant circumferential and longitudinal stresses, ensuring that the pipeline retains its exact shape and technical integrity throughout its 50+ year operational design life.

• Outstanding Resistance to Thermal Expansion and Contraction: Large-diameter solid plastic pipes have a high thermal expansion coefficient, necessitating costly expansion loops or complex installation joint configurations. Our composite matrix dramatically restricts thermal elongation—lowering the expansion coefficient to a level near that of traditional metallic steel pipes, guaranteeing dimensional security during extreme temperature shifts.

• Total Defense Against Rapid Crack Propagation (RCP): One major risk for large-scale high-pressure plastic mains is rapid crack propagation, which can cause sudden, catastrophic pipeline failure. The internal heavy-duty perforated steel grid acts as an absolute structural barrier, instantaneously stopping any micro-fracture or local mechanical stress point from migrating into a longitudinal crack.