In the construction of cathodic protection, why is it necessary to set up testing piles where pipelines cross rivers, highways and railways?

According to my personal understanding, river, highway and railway belong to the three through project, which basically belong to the single drawing pipe jacking. He needs the project and supervision inspection qualified before the next process of construction.

Under what conditions should we take cathodic protection measures for buried steel pipe?

In the long distance buried pipeline, in order to ensure that the pipeline is not easy to be corroded in humid environment, can use cathodic protection measures! There are several ways!

What is the role of the confluence point in a cathodic protection system? Is the impressed current potentiostat used in pairs with the auxiliary anode, or are several power supplies supplied to multiple anodes together

The junction point is the cathode cable access point, and the potential is negative compared with other parts of the pipeline. The potentiostat and the auxiliary anode can be used in pairing or combined for common use, depending on the actual situation.

In the oil production pipeline, when the applied current cathodic protection is used, there should be an insulating flange connection between the protected pipe section and the unprotected pipe section.

In the oil production pipeline, when the applied current cathodic protection is used, there should be an insulating flange connection between the protected pipe section and the unprotected pipe section.

The external wall of oil pipeline is protected by impressed current cathodic protection law in a oil production plant, but such a phenomenon occurs:

1. Pipe perforation is concentrated near both sides of the insulation flange (50cm~100cm), and the perforation frequency is high.

2, cathodic protection equipment for many years discontinued pipe perforation but very few.

From these two characteristics, this phenomenon has a close relationship with the CATHOdic protection system, even a causal relationship. Excuse me what is the biggest possible cause of this situation, who has seen this situation, whether there is a better solution?

Answer: the grounding battery should be added on both sides of the insulation flange.

Is LPG used for tank cathodic protection? why

LPG tanks are usually located on the ground, where contact with soil can cause corrosion, so cathodic protection is required to ensure that the tanks do not corrode or extend their service life.

Is cathodic protection necessary for steel tubes after they have been corroded

No, cathodic protection, also refers to the sacrifice of the negative polarity to achieve corrosion, since the corrosion has been done, there is no need. I feel the need

I heard that cathodic protection works only when the metal is in water, but not when it's dry?

You have to figure out why you want to do cathodic protection, the purpose is to prevent corrosion, and the four elements of corrosion are: anode, cathode, electrolyte, metal channel. Water is an electrolyte, and without an electrolyte, there would be no flow of electrons and corrosion would not occur, so cathodic protection would not work in dry conditions.

What are the internal and external anti-corrosion measures of the commonly used open steel pipe laying?

Primer: zinc - rich epoxy strength thick - paste primer epoxy iron intermediate paint

Top coat: the top coat is determined by the medium

Galvanized steel pipe for fire fighting (DN< 100) need to do internal and external corrosion

Don't need. Steel pipes are galvanized to prevent corrosion. However, if welding is used, the welding part should be antiseptic

What are the commonly used anti-corrosion measures in chemical production process?

1, the most used is anticorrosive paint, but according to your process environment on the bottom, middle, top paint requirements.

2, can choose anticorrosive material of pipes, equipment, such as steel lining ptfe, steel lining PO, rubber, FRP pipe, UPVC and PE and other plastic pipes, graphite equipment.

3. Metal pipes can also be covered with glass cloth and epoxy resin brush. The number of layers of glass cloth package according to the process environment.

4, with a specific metal block and metal pipe connection, the use of positive and negative ion principle for anticorrosion, that is, cathode anticorrosion, but this should be according to your process environment consulting professional units in this respect, to the Internet can be found.

5, if it is necessary to anti-corrosion pool with epoxy resin and anti-corrosion tile or anti-corrosion cement (anti-corrosion cement is suitable for less water concentrated acid)