The 9 anti-corrosion principles and structure of 3pe anti-corrosion steel pipe: 3pe anti-corrosion steel pipe * Its literal meaning, * is a three-layer anti-corrosion PE steel pipe. 3pe anti-corrosion steel pipe is widely used today, a good anti-corrosion steel pipe. 3pe anticorrosive steel pipe in the implementation of SY/T0413-2002 standard, yesterday received a customer call, ** to write it out, convenient for customers to know later, you should know that 3pe anticorrosive steel pipe is mainly two parts, one part is the anticorrosive layer, the other part is the steel pipe, the main steel pipe spiral steel pipe, straight seam steel pipe, seamless steel pipe.

3pe anticorrosive layer in the implementation of SY/T0413-2002 standard, SY/T0413-2002 will be 3PE anticorrosive layer peel strength, impact resistance indicators greatly improved, and clearly specified according to the carbon black content of some special materials, the mechanical strength and weather resistance of 3PE anticorrosive layer, Moreover, the sampling frequency of the strip strength (i.e. the strip strength of the heat shrinkable sleeve and the heat shrinkable strip on the primer steel) was increased.

The thickness of the outer anticorrosive layer is determined according to the German standard DIN30670-1991 based on low and medium density polyethylene.

Spiral steel pipe implementation standards: The commonly used standards of spiral steel pipes are generally divided into :SY/T5037-2008 (Ministry standard, also known as spiral seam submerged arc welded steel pipes for ordinary fluid transportation pipelines), GB/T9711.1-2008 (standard, also known as the oil and gas industry steel pipe delivery technical conditions part: A-class steel pipe (GB/T9711.2 B-class steel pipe with strict requirements), API-5L (American Petroleum Association, also known as pipeline steel pipe; Which is divided into PSL1 and PSL2 two levels), SY/T5040-2008 (pile spiral weld steel pipe).

SY/T5037-2008 is a standard set by the Ministry of Petroleum generally called the Ministry standard

GB/T9711.1-2008 Spiral pipe, oil and gas industry steel pipe, Class A

General spiral seam high frequency welded steel pipe for low pressure fluid transport (SY5039-2000) is a hot-rolled steel strip coil as a tube billet, often warm spiral forming, the use of high frequency lap welding method for general spiral seam high frequency welded steel pipe for low pressure fluid transport.

Pile spiral weld steel pipe (SY5040-2000) is a hot-rolled steel strip coil as a tube billet, often warm spiral molding, using double-sided submerged arc welding or high-frequency welding made of steel pipe for civil building structures, docks, Bridges and other foundation piles

Straight seam steel pipe implementation standards: according to manufacturing standards can be divided into standard, electrical standard, water standard, American standard, German standard, Japanese standard, Russian standard and so on.

9 anti-corrosion principles of 3pe anti-corrosion steel pipe:

1. Pipeline anticorrosion usually adopts two main commonly used means of external coating and cathodic protection.

2. Although the vast majority of the surface of the pipe is covered by the coating, a slight leak * will produce an unimaginable rate of corrosion, even * perforation or cracking. Therefore, the coating system is usually used in combination with cathodic protection in pipeline corrosion protection to achieve a coverage rate of 1 00%, so as to avoid unimaginable consequences in the future.

3. The cathodic protection used in pipeline anticorrosion is divided into sacrificial cathodic protection and impressed current cathodic protection.

The purpose of the coating is to form a continuous covering layer of insulating material, and directly insulate the metal and the electrolyte in direct contact with it, so that the correct electrolytic reaction cannot occur.

5. The discontinuity point in the coating laying process is called the leak point, which is mainly caused by the coating, transportation or installation process, and may also be caused by the aging of the coating, soil stress or the movement of the pipeline in the soil, and the damage caused by the three parties is not found in time.

6. Impressed current cathodic protection principle: By applying a amplitude current to the protection metal, through the cathode polarization, the potential of all the cathode points reaches the open potential of the active anode point, the corrosion on the structure stops.

7. Composition of impressed current cathodic protection: rectifier and potentiostat

8. Rectifier: converts alternating current to direct current.

9.3PE anti-corrosion steel pipe potentiostat: can automatically control the pipeline potential constant electronic instrument.