Why Should the Processing Tube Sheet be Anti-corrosion?

As the tube sheet is mainly used in chemical vessels, such as tube heat exchangers, pressure vessels, boilers, condensers, central air conditioning, evaporators, desalination, to support the role of fixed tube, the metal material makes it not only has a very strong rigidity, but also has a great heat transfer properties.

The tube plate is exposed to a variety of chemical media, it will be corroded by the chemical media. In addition, the tube plate will also produce a certain amount of bimetallic corrosion between the heat exchanger tube. Some of the tube plate is also in the long term corrosion medium erosion, so do a good job of tube plate corrosion protection is very important for enterprises.

In the process of tube plate processing, the accuracy of tube plate processing is particularly important, especially the tube hole spacing and tube diameter tolerance, verticality, finish will directly affect the assembly and performance of the equipment used.

In the round steel plate drilled to meet the outside diameter of the assembled tube holes, tube plate is a heat exchanger to play a fixed tube as well as sealing the role of the media round steel, the tube will be penetrated and welded to the fixed media.

In the calculation of fixed tube plate according to a variety of working conditions with temperature differences calculated shell axial stress, heat exchanger tube axial stress, heat exchanger tube and tube plate between the pull-off force in the need to set up expansion joints, can also set up expansion joints to thin the tube plate, but from the material consumption, manufacturing difficulties, safety and economic effects, such as a comprehensive assessment depends.

Fixed tube plate heat exchanger is commonly used in the U-shaped expansion joint, which has the advantages of compact and simple structure, good compensation, cheap price, etc..

With the large-scale chemical equipment, power stations, its tube plate diameter has become larger and larger, large tube plate is characterized by the number of holes, dense, small aperture, deep, high precision and finish requirements.

The main factors affecting the corrosion of the tube sheet are.

(1)Media composition and concentration: the impact of concentration varies, for example, in hydrochloric acid, the greater the general concentration of corrosion is more serious. Carbon steel and stainless steel in the concentration of about 50% of the most serious corrosion in sulfuric acid, and when the concentration increases to more than 60%, corrosion instead of a sharp decline;

(2)Impurities: harmful impurities, including chloride ions, sulfur ions, cyanide ions, ammonia ions, etc., these impurities in some cases can cause serious corrosion;

(3)Temperature: corrosion is a chemical reaction, the temperature is raised every 10℃, corrosion rate increased by about 1 to 3 times, but there are exceptions;

(4)PH value: the smaller the general ph value, the greater the corrosion of metals;

(5)Flow rate: in most cases the greater the flow rate, the greater the corrosion.

Tube plate anti-corrosion protection process is as follows.

①Surface sandblasting treatment to remove the oxide layer, and make the surface rough and clean;

②Mix SD8000 material according to the proportion and apply thinly to the surface of the pipe plate;

③Mix SD8002D material according to the proportion, evenly brush or spray to the surface of the pipe plate;

④It is recommended to heat curing to better improve the mechanical properties and anti-corrosion properties of carbon nanopolymer and complete the operation.

Jetvision specializes in the production of flanges, tube sheet, pipe plate processing, and external mechanical processing business, processing the main equipment of the pipe plate are Fain dual-axis deep hole drilling, Qi Yi 4m, 5m vertical turning, 3-4m end car, 4m 5m, 6m CNC gantry drilling machine; Haitian 3m*6m machining center; 10m extension car, 50, 80 drilling machine, etc..

Heat transfer division as a branch company of Group Hunan Jetvision Industrial Co., Ltd. We have grown to be a professional supplier in key customized components of Shell tube HE. Offer one-stop service to our client, main products including tube shell HE----like U tube, tube sheet, shell flange, baffle plate, fin tube, vessel heads, etc.

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