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CJ/T120-2016 "Plastic coated Composite Steel Pipe for Water Supply" is an update to the 2008 version of the standard. The main revisions include expanding the scope of application, refining classification and marking methods, adjusting material performance requirements, modifying coating thickness specifications, supplementing factory inspection items, and adding provisions for repairing coating defects.
keyword CJ/T 120 Category Anti-coating pipe standards Related products Get a quoteCJ/T 120 water supply coated composite steel pipe
CJ/T120-2016 "Plastic coated Composite Steel Pipe for Water Supply" is an update to the 2008 version of the standard. The main revisions include expanding the scope of application, refining classification and marking methods, adjusting material performance requirements, modifying coating thickness specifications, supplementing factory inspection items, and adding provisions for repairing coating defects. This standard is applicable to anti-corrosion steel pipes in the fields of water supply, gas, fire protection, etc., with particular emphasis on the performance requirements for epoxy resin and polyethylene powder coatings.
Technical parameters and material requirements for anti-corrosion steel pipes
According to the standard, the anti-corrosion steel pipe substrate can be made of spiral welded pipe, straight seam welded pipe or seamless steel pipe, and the coating types include 3PE (three-layer polyethylene), epoxy resin (EP), epoxy coal tar, etc. The 3PE anti-corrosion layer is composed of fusion bonded epoxy powder, copolymer adhesive, and polyethylene, with a thickness range of 400-1000 μ m. Epoxy resin coating needs to meet the requirements of impact resistance, wear resistance, and chemical corrosion resistance. Fire pipes also need to have high temperature resistance and flame retardant properties.
Production process and inspection methods
The standard requires that the surface pretreatment of steel pipes should meet the Sa2.5 rust removal standard, and the coating should use hot dipping, spraying or rolling molding processes. The inspection items include coating adhesion test (grid method), bending resistance test (no cracking after bending at 6 times the diameter of the pipe), flattening test (no peeling of the coating), and electrical discharge testing (no leakage). Fire resistant coated steel pipes also need to pass tests for corrosion resistance to fire extinguishing agents and wood stack fires.
Application Fields and Special Requirements
This standard covers areas such as municipal water supply and drainage, oil and gas transportation, fire protection systems, and power wiring. For example, fire buried pipelines need to comply with the pressure resistance and flame retardant indicators of CJ/T120-2008; Mining coated steel pipes require anti-static and flame-retardant properties; The 3PE anti-corrosion of gas pipelines shall comply with the dual standards of SY/T0413-2002 and DIN30670.
The main differences between the old and new standards
The 2016 version added the classification of pipe high working pressure (PN1.0-PN2.5MPa), adjusted the gelation time of epoxy powder from ≤ 120 seconds to ≤ 90 seconds, and increased the density requirement of polyethylene coating from ≥ 0.940g/cm ³ to ≥ 0.950g/cm ³. At the same time, it is specified that the outer coating needs to undergo a UV aging test (1000 hours without powdering).
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