PRODUCT PARAMETERS

 

Product name	Boiler tube shield
Type	Straight shields;Curved shields;Tube shields;Clips
Material	Carbon steel;Alloy steel;Stainless steel
Temperature	As requirement
Function	Protecting tubes

 

Tubes Erosion Shields

 

Tubes Erosion Shields are used to reduce excess wear of boiler tubes within the extreme conditions prevalent inside a fossil fuel fired boiler, we are able to manufacture and supply erosion shield solutions to protect and reduce wear in all applicable boiler related situations.

Boiler Tubes Erosion Shields, also known as anti-corrosion Shields, anti-wear plate, anti-wear protection Shields, anti-wear cover plate, anti-corrosion cover plate, boiler climbing pipe, anti-wear pressure plate, etc. , which are used in combination with snap rings.

Boiler Tubes Erosion Shields are produced using a high-pressure press and professional mold pressing. The production time is short, the welding performance is good, the welding should not fall off, the surface is smooth, and the appearance is beautiful. Boiler Tubes Erosion Shields with bends are formed by pressing on a press or bending with a special abrasive on a tube bender.

Boiler Tube Shields are designed to eliminate major maintenance and downtime costs from boiler and condenser tube failure.

 

Service life

 

The service life of Boiler Tubes Erosion Shields is different in different types of boilers and different use parts. The normal service life is a period of overhaul (3-5 years) for the boiler. Generally, some boilers will be replaced or retrofitted every time the boiler is overhauled. The main replacements are those of the Boiler Tubes Erosion Shields that are severely thinned and exceeded the standard; those that were not firmly detached during the boiler operation during the previous installation. According to the wear of the Boiler Tubes Erosion Shields during replacement, if the thickness is severely reduced, it needs to be replaced, the deformation is severe, and those that cannot protect the tube also need to be replaced. In addition, some boiler tubes are not equipped with Boiler Tubes Erosion Shields, but during the boiler inspection, it is found that the tubes have a tendency of wear and thinning. Generally, Boiler Tubes Erosion Shields are also installed to prevent further wear of the tubes and cause serious consequences such as boiler explosion.

On the heating surface of superheater and economizer tube bundle of the boiler, in order to prevent the pipe from being worn by high temperature flue gas washing, boiler tubes erosion shields are mostly arranged on the outer side of the pipe in the direction of flue gas flow. The elbow erosion shields solves the abrasion problems of water wall tubes, superheater tubes, economizer tubes and reheater tubes in the furnace, and provides guarantee for the long-term and reliable operation of CFB boiler. With the increase of CFB boiler products, the type and quantity of The elbow erosion shields will increase.

 

304 stainless steel Erosion Shields

Grade 304 stainless steel is the most versatile and the most widely used of all stainless steels.

309 stainless steel Erosion Shields

CS 309 is a highly alloyed austenitic stainless steel used for its excellent oxidation resistance, high temperature strength and creep resistance.

310S stainless steel Erosion Shields

Grade 310S is a lower carbon version, less prone to embrittlement and sensitisation in service.

 

316L anti corrosion and anti wear steel erosion shields

 

Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments.

 

Custom Straight Shields

 

Straight Shields are available with angles of wrap between 90º to 240º and can be manufactured with straight ends, belled ends and flared legs. Complete coverage is available by overlapping shields.

 

Custom curved shields

 

Curved Shields can be manufactured to cover both outside and inside curves of tubing.

 

Shapes and specifications of Tubes Erosion Shields

 

The cross-sectional shape of Boiler Tubes Erosion Shields is mostly semi-circular (180 degrees), and there are also 120-160 degrees. It is mainly used on finned tubes (water-cooled walls); Boiler Tubes Erosion Shields are divided into direct wear-resistant shields, In-curve anti-wear shields, outer-curve anti-wear shields, side-curve anti-wear shields, S-curve anti-wear shields, etc.

 

 

Inside of bend

S-shape Outside of bend

Straight tubes erosion shields

The length of the straight anti-wear shields ranges from 20mm to 3000mm, and the general length of 1000-2000mm is commonly used. The anti-wear shields with bends generally requires a processing drawing and the following parameters should be on the drawing: outer diameter of the pipe used, bending of the pipe Radius R (to the center of the pipe), the degree of bending angle, and the length of the straight sections on both sides of the arc segment of the wear-resistant shields.

The most basic parameter of Boiler Tubes Erosion Shields is the outer diameter of the tube used (that is, the inner diameter of Boiler Tubes Erosion Shields). The main specifications of the tube are: 32, 38, 42, 44.5, 48, 51, 57, 60, 63.5 , 76, 89mm, etc .; The inner diameter of the Boiler Tubes Erosion Shields is usually 1-3mm larger than the outer diameter of the tube used, depending on the actual requirements.

 

 

Boiler Tubes Erosion Shields

 

Boiler Tubes Erosion Shields, also known as anti-corrosion Shields, anti-wear plate, anti-wear protection Shields, anti-wear cover plate, anti-corrosion cover plate, boiler climbing pipe, anti-wear pressure plate, etc. , which are used in combination with snap rings.

 

Install erosion shields with snap ring

 

The snap ring is a short section that is installed on the pipe in conjunction with the wear-resistant tile. Generally, it is welded to the wear-resistant tile by lap welding, that is, to cover the wear-resistant tile slightly, so it is larger than the wear-resistant tile. The opening arc is Around 190-200 degrees, the welding position needs to be set aside to facilitate welding and fixing. The width of the snap ring must not be less than 20mm.

The installation requirements of anti-friction tiles of different shapes are slightly different. Basically, each anti-friction tile is installed with not less than 2-4 snap rings. The snap ring and the anti-friction tile are welded together to prevent expansion due to heat. The tiles fall off, and the joints are required to be fully welded.

U-shaped snap ring

 

The inner diameter of the U-shaped snap ring is the outer diameter of the wear-resistant tile plus the thickness of the wear-resistant tile, and the length varies from 20mm to 70mm. It will be 5mm more in semicircle. The extra part during installation will hold the wear-resistant tile and then spot weld. Compared with the butt-type semicircular snap ring, it is stronger after holding the wear-resistant tile and welding.

 

C-shaped snap ring

 

C-shaped snap ring is the most common snap ring. Mainly based on the size of anti-friction tile, the diameter and thickness are similar to the matching anti-friction tile, and the length varies from 20mm to 70mm. It is mainly connected to the wear-resistant tile by spot welding when installing the wear-resistant tile, so as to fix and prevent the wear-resistant tile from falling off.