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what is fbe?

FBE is the abbreviation of “FUSION BOND EPOXY”, the English name of fusion bonded epoxy. There are two types of FBE coatings: single layer and double layer. The so-called FBE coating generally refers to a single-layer fusion-bonded epoxy coating. The single-layer FBE coating uses a special fusion-bonded epoxy powder coating as the film-forming material. This epoxy powder coating is a thermosetting coating, which is processed by mixing and crushing solid epoxy resin, curing agent and various auxiliaries. The steel pipe is shot blasted and preheated at intermediate frequency before painting, and then the epoxy powder coating is sprayed on the surface of the heated steel pipe by electrostatic spraying method, and it is melt-bonded on the surface of the steel pipe and cured to form a coating. The FBE coating is generally a one-time film-forming structure with a film thickness of 300~500μm. FBE coating has the advantages of strong adhesion to steel, good film integrity, resistance to cathodic disbondment, soil stress resistance and abrasion resistance, but the ability to resist mechanical damage and moisture and heat resistance is poor. FBE coating can be used for external anticorrosion of steel buried pipelines or underwater pipeline facilities with a working temperature of -30~100 degrees Celsius.


Fbe Coating and fbe coating specification

The coating implements the following standards:

SY/T0315、CAN/CSA Z245.20、AWWA C213、Q/CNPC 38等标准。

FBE Coating Patch

  1. The scope of repair
    Repairs are allowed when the number of defects per pipe does not exceed 2, and the area of ​​a single defect does not exceed 30cm2;
    Exceeding this requirement must be peeled and reapplied.
  2. Repair materials and tools
    adhesive tape
    Two-component liquid epoxy coating
  3. Patch:
    3.1 To keep the repaired parts dry and clean, it is not suitable to repair in rain, snow, and humid environments;
    3.2 Remove burrs, deformations, protruding parts and weakly bonded coatings on the surface of the steel pipe substrate;
    3.3 Grind the defective parts with a file, and remove the oil, dust impurities and rust from the defective parts;
    3.4 Paste the adhesive tape around the area to be repaired to prevent the spread of the repair fluid and contamination, and the distance between the edge of the paste area and the repair edge is greater than 10mm;
    3.5 Mix an appropriate amount of paint according to the mixing ratio given by the two-component liquid epoxy paint manufacturer to ensure uniform stirring;
    3.6 The mixed repair paint has a pot life to ensure that the mixture is used in a gelatinized state that can be stirred;
    3.7 Use a scraper to apply the mixed two-component paint on the defective part to ensure that the paint is filled tightly without hidden gas and pinholes.
  4. Inspection after repair
    4.1 The inspection of the repaired coating includes appearance, thickness and leak detection;
    4.2 The surface of the repaired coating is smooth and flat, without dark bubbles and pinholes;
    4.3 The thickness of dry film coating after repair should meet the requirements of pipeline coating thickness;
    4.4 After the coating is cured, no cracks, pinholes, etc. are allowed in the repair area, and re-repair is allowed;
    4.5 Leak detection of each repaired part, the leakage detection voltage is 5V/um, and there is no leakage point. If there is a leak, repair it again until it passes.

FBE coating application process

Regardless of the shape and type of steel surface to be coated, the FBE powder coating application has three essential stages:

  1. the steel surface is thoroughly cleaned,
  2. the cleaned metal part is heated to the recommended FBE powder application temperature, and
  3. the application and curing stage.

The advantage of pipe and rebar is that their round shape allows continuous linear application over the exterior surface, while the parts are moved in a conveyor through the powder application booth, ensuring high throughput. On fittings, etc., the coating is applied by manual spray guns. Another method of application is “fluid-dip” process, in which the heated components are dipped in a fluidized powder bed (see below).


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