Snap Rings for Erosion Shields
Snap Rings for Erosion Shields - seamless steel tube
Full series alloy tube shields with dual installation options of snap clamp fixing or spot welding, multiple stainless & high-alloy grades, customized sizes for straight tubes and elbow outer arc anti-wear protection.
Tube Shields, also called boiler tube erosion protection sleeves, are precision hydraulic stamped alloy protective casings specially designed for thermal power and CFB boiler heat exchange tubes. During boiler operation, high-speed fly ash continuously scours water wall buried tubes, superheater, reheater and economizer tube bundles, leading to tube wall thinning, pitting corrosion, tube burst and unexpected shutdown, bringing massive production losses.
Installing tube shields on wear-prone tube sections creates a durable physical barrier between flue ash and base boiler tubes, bearing all abrasion and impact to protect original heating tubes. We supply four mainstream structural tube shield types for different furnace wear areas, with complete carbon steel, stainless steel and high nickel alloy material options. Two mature installation methods are available: homogeneous alloy snap clamp fixing and permanent spot welding.
All tube shields are produced conforming to ASTM and ASME standards, fully compatible with 20G seamless boiler tubes, stainless steel half repair sleeves and matching alloy C/U clamps. It forms a complete boiler tube anti-abrasion and overhaul maintenance solution for annual power plant renovation projects.
Covers low-cost carbon steel, standard 304/316L stainless steel, high-temperature resistant 309S/310S austenitic stainless steel and Hastelloy high nickel alloy series. Clients can select proper grades according to furnace temperature, sulfur content and ash abrasion strength to avoid over-spec material cost waste.
Adopts dedicated semicircular mould integral cold stamping craft, smooth seamless inner arc closely fits outer surface of standard boiler tubes, eliminating narrow gaps between shield and tube which trap ash and cause concentrated local abrasion.
Homogeneous alloy C/U snap clamp mounting without welding, suitable for medium abrasion zones requiring regular annual inspection and disassembly; spot welding permanent fixing for heavy ash impact furnace sections that need long-term stable positioning without frequent disassembly.
Four mainstream styles separately fit straight tubes, elbow outer arcs and local partial abrasion sections. No exclusive custom moulds required for various heating surface layouts, greatly shortening production lead time.
Custom sizes matching all mainstream boiler tube outer diameters, adjustable shield wall thickness and single segment length. Short patch shields can be produced for partial local wear to save raw material consumption.
Every batch passes PMI material composition verification, full dimensional calibration and surface flaw inspection. EN10204 MTR material test certificates are provided together with delivery goods for project acceptance.
Not only limited to thermal power and CFB boilers, but also applicable to petrochemical high-temperature heat exchange tubes, oil & gas above-ground process pipelines and chemical factory high-corrosion coil protection.
180° semicircular split design, used for straight heating tubes and elbow outer arc wear protection. Can be fixed with matching alloy clamps or spot welded, convenient to disassemble during boiler annual maintenance.
360° fully enclosed sleeve structure, applied to ultra-severe uniform abrasion zones where all tube surfaces bear strong ash scouring.
Short segmented half-round casings, only cover partial worn tube sections, effectively reduce material cost compared with full-length shields.
Custom bent and special shaped shields designed for finned heat exchanger tubes and irregular furnace tube layout areas.
| Alloy Grade | Max Continuous Service Temp | Core Corrosion & Wear Resistance | Typical Working Scenario |
|---|---|---|---|
| Carbon Steel | ≤420℃ | General mild abrasion, low cost | Low-temperature low-sulfur light load boiler zones |
| 304 / 316L Stainless Steel | ≤850℃ | Medium sulfur & chloride flue resistance | Medium temperature economizer and general chemical heat exchange tubes |
| 309S / 310S Stainless Steel | ≤1150℃ | High temperature & high sulfur flue resistant | CFB furnace superheater & reheater high temperature zones |
| Hastelloy C276 / C22 | ≤650℃ | Extreme acid & chlorine corrosion resistance | Chemical factory severe corrosive medium heat exchange coils |
Material Selection Tip: High-temperature high-sulfur CFB boiler superheater zones select 310S half round tube shields; chemical pipelines with chlorine medium adopt Hastelloy alloy tube shields.
| Matching Base Tube Outer OD (mm) | Tube Shield Wall Thickness (mm) | Single Shield Segment Length (mm) | Applicable Structural Type |
|---|---|---|---|
| 32 / 38 / 42 / 51 / 57 | 3.0 ~ 6.0 | 100 ~ 800 | Half round / local patch shield |
| 60.3 / 76 / 89 / 108 | 4.0 ~ 8.0 | 200 ~ 1500 | Half round / full wrap circular shield |
| 114 / 168 / 219 | 6.0 ~ 12 | 300 ~ 3000 | Full wrap circular / custom profiled shield |
Note: Special bend radius, ultra-thick heavy-duty and finned tube customized tube shields can be produced by developing exclusive stamping moulds per engineering drawings.
Construction reminder: Clamps must adopt the same alloy grade as tube shields to avoid electrochemical corrosion between dissimilar metals.
Tube Shields are universal anti-abrasion protective components for high-temperature heat exchange tubes, widely deployed across power, chemical, metallurgy and marine sectors. The table below lists mainstream industries, typical equipment and core reasons for adopting tube shields:
| Industry | Typical Use | Why Tube Shields |
|---|---|---|
| Power Generation | Boiler, economizer & superheater tube banks | Resist fly-ash & soot-blower erosion |
| Waste-to-Energy | Incinerator & waste-heat boilers | Heavy abrasive ash protection |
| Sugar & Cement | Bagasse & kiln-gas boilers | High dust-load erosion zones |
| Refinery & Petrochemical | Fired heaters & heat-recovery units | Alloy shields for hot, corrosive gas |
| Steel & Metals | Recuperators & heat recovery | High-temperature scaling resistance |
| Chemical Plants | Process boilers & exchangers | Hastelloy / Monel for corrosive gas |
| Pulp & Paper | Recovery & power boilers | Protects against ash erosion |
| Marine & Boilers | Ship & package boilers | SS / Monel corrosion resistance |
Main protection defects solved: Fly ash abrasion wall thinning, high-temperature flue oxidation, particle impact pitting, local concentrated wear of elbow outer arc tube wall.
| Comparison Item | Clamp Detachable Tube Shield | Spot Weld Permanent Tube Shield |
|---|---|---|
| Disassembly Convenience | Easy to remove for annual boiler inspection | Cannot disassemble, must cut off during replacement |
| Anti-Displacement Capacity | General, may slide under ultra-strong ash impact | Excellent, completely fixed without displacement risk |
| On-Site Construction Workload | Low, no welding equipment required | High, welding machine and welder labor required |
| Impact On Base Tube | No welding damage to original tube wall | Local welding heat affects tube surface microstructure |
| Suitable Working Zone | Medium abrasion, regular inspection furnace areas | Heavy ash impact, long-term non-maintenance furnace sections |
1. Pre-installation cleaning rule: All ash, rust and oxide scale on boiler tube surface must be fully cleaned to ensure tight fitting between shield and tube wall.
2. Clamp matching requirement: Clamps must adopt the same alloy material as tube shields to prevent galvanic corrosion contact corrosion.
3. Annual shutdown inspection focus: Check clamp looseness for detachable tube shields; inspect weld crack and shield abrasion thickness loss for welded fixed shields.
4. Replacement standard: When shield wall thickness loss exceeds 1/3 of original thickness, new tube shields need to be replaced to protect base tubes.
5. Warehouse storage protection: Separate tube shields with anti-rust paper during stacking, store in dry ventilated warehouse to avoid surface rust staining before delivery.
1. Gradient multi-alloy material matching system, precisely match different furnace temperature and flue corrosivity levels, avoid excessive material cost investment for mild working conditions.
2. Integrated one-time stamping forming eliminates internal gaps that trap ash, effectively avoid secondary concentrated abrasion caused by ash accumulation between shield and tube.
3. Dual detachable clamp & permanent welded installation schemes, fully meet two major demand directions of regular inspection and long-term fixed protection for power plant boilers.
4. Four diversified structural shapes cover all common straight tube, elbow and local partial abrasion positions of boiler heating surfaces, one-stop matching without multiple customized accessories.
5. Perfectly matched with half repair sleeves, alloy clamps and laser cladding anti-wear processing service, form complete pre-protection + post-overhaul boiler tube solution.
Customizable core technical parameters: Matching boiler tube outer diameter, shield wall thickness, single segment length, structural type (half round / full wrap / patch), alloy material grade, clamp or welded installation mode.
Special customized optional items: Cr3C2 laser cladding heavy anti-wear tube shields, finned tube special profiled shields, ultra-thick wall heavy-duty furnace dedicated tube shields.
Attached supporting technical service: On-site furnace abrasion zone assessment, installation construction guidance, long-term power plant annual renovation bulk order preferential framework contract supply.
Alloy tube shields focus on semicircular arc surface scratch and rust prevention during packaging and transportation:
Small batch small diameter tube shields: Separately wrapped with anti-rust oil paper, placed into fumigated export wooden cases filled with foam buffer filler to avoid mutual collision scratch.
Large size thick alloy tube shields: Stack with rubber isolation cushion blocks between layers, fixed on heavy-duty steel transport pallets, whole pallet wrapped thick black anti-rust stretch film for full moisture isolation.
Multiple international trade delivery terms FOB, CFR and CIF fully supported, sea freight and land truck combined transportation arranged according to overseas project designated port schedule. Each shipment batch attached full set of alloy material MTR, dimensional inspection record and installation technical manual for project customs clearance and acceptance inspection procedures.
Generally, boiler tubes erosion shields are also installed to prevent further wear of the tubes and cause serious consequences such as boiler explosion.
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Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
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When you partner with Sunny Steel, you can stop worrying about meeting deadlines thanks to our responsive and timely service. You'll also say goodbye to unnecessary shopping around. Instead, you'll get white glove service from an expert who understands your needs and can get you the materials you need quickly.
