SS 309 Shield
SS 309 Shield - erosion shield for boiler protection
Protective devices used to safeguard tubes against abrasive wear and erosion caused by the flow of high-velocity particles, steam, or flue gases in boilers, extending the service life of boiler tubes and reducing maintenance costs.
Download PDFBoiler erosion shield is designed to eliminate major maintenance and downtime costs from boiler and condenser tube failure. Boiler erosion protection shield 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.
The useful life of tube shield is 3-5years. The tube shield has a variety of material and the selection of the material shall be subject to the original design of the boiler.The tube shield is divided into straight pipe and bend pipe. The main effect of tube shield is to protect the pipe and increase the service life of the pipe.
Boiler Tubes Erosion Shields are processed in thicknesses of 2mm, 3mm, 4mm, and 5mm. Different thickness is adopted according to the wear severity and the need of heat conduction. Shapes and specifications of Boiler 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.
The erosion shields can be made out of mild steel, chrome moly steel, stainless steel and exotic alloys such as Inconnel. The most popular materials and sizes are 3mm stainless steel grade 304 and 2mm stainless steel grade UNS S30815 (Sandvik grade 253MA). Uneek Bending uses certified material to A387 P11,P22 chrome moly and Australian Standard A240TP304, 316 and 309 stainless steel. Our shields can also be coated with a hard wearing chromium carbide coating for addtional wear resistance.
Erosion shields for boiler tubes are protective devices used to safeguard tubes against abrasive wear and erosion caused by the flow of high-velocity particles, steam, or flue gases in boilers.
These shields are particularly crucial in areas prone to severe erosion, such as bends, tube banks, and other high-turbulence zones.
Material Type: SS310/SS304
Thickness: 3mm
Quantity: 50 pcs each type
Application: Erosion shield for the boiler tubes, see various boiler tube OD below.
Clip: All erosion shields should be provided with 3 clips, except the nosewall.
The cross-sectional shape of boiler tubes 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 tube 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.
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 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.
The current production process for tube shields is to use high-pressure presses and professional moulds for pressing.
Tube shields from us are manufactured to exacting standards. Advanced equipment and material handling capabilities permit us to offer the fastest turnaround times anywhere.
The current production process for tube shields is to use high-pressure presses and professional moulds for pressing.
The production time is short, the welding performance is good, the welding seam does not fall off, the surface is smooth and the appearance is beautiful. The arc-shaped wear-resistant tile is pressed on a press or bent on a pipe bender with a special mould.
To ensure the accuracy of the material. Positive Material Identification (PMI) of stainless steel sheets for tube shields is critical to verifying the grade and composition of stainless steel before it goes into production.
The raw materials for the production of tube shields are generally purchased directly from standard steel mills, and each batch has an MTC. Due to the sharpe limitations of raw materials, it is inevitable that excess materials will be produced. We can use the excess material to make a smaller size snap ring.
Tube erosion shields are precision-engineered to fit straight, curved, finned and specialty tubing, providing continuous protection against fly ash erosion and high-temperature corrosion.
Also known as anti-wear plates or boiler climbing shields. Installed with retaining snap rings to ensure long-term stability on heating surfaces.
Manufactured by high-pressure die forming with dedicated tooling. Bent profiles use press forming or precision mandrel bending for close tube contour conformity.
Robust, weld-friendly assemblies with smooth aerodynamic surfaces. Mitigate tube wall thinning, reduce unplanned maintenance and extend boiler availability.
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.
Tube erosion shields are installed on the windward side of boiler heating surfaces, including superheaters, reheaters, economizers and water-wall tubes.
Erosion shields protect boiler tubes from high-temperature, high-velocity flue gas and fly ash, significantly extending tube service life.
We supply shields for straight, bent and finned tubes, complete with retaining clips for secure installation.
By minimizing tube wall thinning and leakage risks, erosion shields reduce unscheduled downtime and lifecycle maintenance costs.
These components—often referred to as wear-resistant tiles or cover plates—are widely used in utility boilers and coal-chemical plants.
Generally, boiler tubes erosion shields are also installed to prevent further wear of the tubes and cause serious consequences such as boiler explosion.
The main role is to protect the heating surface of the boiler pipes, reduce pipeline wear, and increase the heating surface of the pipes.
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.
Generally, boiler tubes erosion shields are also installed to prevent further wear of the tubes and cause serious consequences such as boiler explosion.
The main role is to protect the heating surface of the boiler pipes, reduce pipeline wear, and increase the heating surface of the pipes.
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
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