Boiler Erosion Shield
Boiler Erosion Shield - erosion shield for boiler protection
Integral stamped half round tube shields in multiple heat resistant alloys, dual thermal & erosion barrier for economizer, superheater and fin transition tube bundles, matched snap lock fasteners for quick site installation.
Half round tube shields, also known as U-shaped tube sleeves, are precision stamped half-circular metal casings developed exclusively for boiler heat transfer tube thermal and erosion protection solutions. In coal-fired power plants, circulating fluidized bed boilers, biomass and municipal waste incineration boilers, high-speed fly ash, sulfur flue particles and soot blower jets continuously impact the outer wall of economizer, superheater and reheater tubes, causing gradual wall thinning, perforation and unplanned boiler shutdown.
This half-round sleeve wraps over 180 degrees of the heat exchange tube outer surface, forming a physical buffer barrier to isolate abrasive flue media from base tube material. We manufacture three core protection categories as industrial standard: mechanical metal half round shields, ceramic composite lined shields and direct spray anti-abrasion coating solutions. Multiple heat resistant alloy grades are selectable to match low-temperature tail flue up to ultra-high temperature furnace arch working zones.
Matched C-type and U-shaped snap lock fasteners of identical alloy grade are supplied together, enabling two flexible installation modes for power plant annual overhaul anti-abrasion renovation projects worldwide.
Half round tube shields balance high temperature oxidation resistance, sulfur ash corrosion resistance and overall project budget, solving the core abrasion pain points of boiler heating surfaces. Three mainstream protection systems are available to fit different flue harshness levels:
Integral hydraulically stamped U-shaped mechanical sleeves are the standard choice for most boiler anti-wear projects. The semicircular structure fully fits the tube outer diameter without gaps to avoid trapped ash and concentrated abrasion. Straight tube half sleeves, inner U-bend wrap shields and outer bend full wrap variants are all in production. Installation via snap ring clamping or spot welding delivers fast construction during boiler shutdown cycles, making this the primary thermal and erosion protection product for economizer and medium-temperature superheater tube bundles.
For ultra-heavy ash impact, high-sulfur flue and long-term high-temperature furnace zones where single metal half round sleeves wear through rapidly, ceramic composite lined shields integrate high-hardness alumina or cast basalt tile with steel outer casing. The ceramic lining multiplies service life compared to plain alloy shields and delivers superior dual anti-abrasion & anti-corrosion performance.
A lightweight alternative without extra sleeve hardware: high-temperature polymer, ceramic slurry or anti-sulfur alloy coating is directly sprayed onto bare tube outer walls. Ideal for compact, densely packed tube bundles where half round shields cannot be mounted, forming a thin uniform erosion-resistant film to slow tube wall thinning.
All half round erosion sleeves adopt integrated hydraulic stamping forming, with strict raw material composition testing and dimensional tolerance control before factory shipment:
Stock semicircular tube sleeves match global mainstream ASME SA179, SA210, SA213 heat transfer tube outer diameters, non-standard arc radian and total sleeve length fully customizable via new stamping mold development:
| Matched Base Heat Transfer Tube OD (mm) | Alloy Plate Thickness (mm) | Half Round Shield Total Length Range (mm) | Common Structural Style |
|---|---|---|---|
| 32 / 38 / 42 | 6 / 8 | 100 ~ 1200 | Straight half round single tube erosion sleeve |
| 51 / 57 / 60 | 8 / 10 | 150 ~ 1800 | Straight half wrap / flat fin protective baffle |
| 76 / 89 | 10 / 12 | 200 ~ 2500 | Outer bend full wrap U-shaped shield / wave fin inter-tube baffle |
Note: Extra thick enhanced wear-resistant alloy plate, super long custom length and oversized outer bend wrap half round shields can be custom produced against customer boiler layout technical drawings.
Two mature installation solutions are provided to adapt different boiler overhaul construction schedules and flue abrasion intensity levels:
All supporting snap lock fasteners are manufactured from identical alloy grade as the half round tube shield, avoiding electrochemical corrosion caused by dissimilar metal contact under high-temperature sulfur-containing flue environments.
| Supporting Product Name | Core Function Description | Matching Application Working Scene |
|---|---|---|
| Half Round Tube Erosion Protection Shield | Semicircular outer wall buffer anti-scour wrap for single heat transfer tubes | Economizer, low & medium temperature superheater straight tube bundles |
| C / U Shaped Alloy Snap Lock Fasteners | Quick locking clip for semi-circular half round tube shield non-weld installation | Small & medium diameter tube bundle regular inspection-friendly layout |
| Wave Fin Inter-tube Anti-wear Baffle | Ash impact buffer plate between adjacent finned tubes | Water wall fin transition severe abrasion flue zones |
| Cast Alloy Saddle Pipe Clamp | Heavy-duty fixed support for full tube bundle assembly layout | Large-size tube bundle overall fixed installation framework |
Half round tube shields are designed for all heating surface positions subject to fly ash particle and sulfur flue erosion in industrial thermal equipment:
Application Zone Reminder: 310S grade ultra-high temperature half round shields are mandatory for furnace arch dense phase zones operating above 850°C; 1Cr13 material delivers optimal cost-performance for economizer flue zones below 600°C.
| Comparison Item | 1Cr13 Half Round Shield | 309S Stainless Half Round Shield | 310S Stainless Half Round Shield |
|---|---|---|---|
| Max Continuous Service Temperature | 550°C | 850°C | 1150°C |
| Sulfur Flue Corrosion Resistance | Good low-sulfur flue performance, cost effective | Medium, prone to sulfide corrosion under high sulfur flue | Excellent high temp oxidation, average sulfur resistance |
| Raw Material Procurement Cost Level | Low, nickel-free martensitic alloy | Medium, medium nickel-chromium composition | High, high nickel-chromium high-temperature alloy |
| Primary Boiler Installation Position | Economizer, low-temperature tail flue superheater | Medium-high temperature superheater tube bundles | |
| Long-term Project Comprehensive Operating Cost | Low initial investment, stable service cycle | Medium one-time purchase cost | Highest upfront procurement expense |
Different alloy grades carry matched standardized construction rules, following operating specifications extends half round tube shield service life and avoids irreversible damage to base heat transfer tubes:
1. Hoisting & transportation rule: Do not violently hammer alloy shield plate surface during handling and installation, to prevent invisible stamping cracks inside the semicircular sleeve body.
2. Welding operation specification: 1Cr13 martensitic material requires workpiece preheating to 300~400°C before welding, slow cooling after welding to eliminate cold welding cracks; 309S / 310S stainless half round shields adopt low-current argon arc welding without high preheating requirements.
3. Snap lock clamping installation check: Ensure full contact fit between half round shield and tube outer wall without gap, symmetrically lock snap rings at both sleeve ends to prevent shield sliding under long-term flue gas vibration impact.
4. Annual boiler shutdown inspection item: Check shield plate thickness thinning level and welding crack conditions, replace severely worn half round shields in advance to prevent base tube abrasion leakage accidents.
5. Warehouse storage protection: Stack finished half round shields with isolation paper between layers, seal warehouse space to avoid surface moisture rust before shipment delivery.
The structural shape and alloy chemical formula of our half round tube erosion shields are fully optimized targeting boiler flue fly ash abrasion real working conditions:
1. One-piece semicircular integral stamping eliminates assembly splicing gaps, avoiding ash accumulation and concentrated local abrasion common in tile-spliced segmented protective covers.
2. Graded alloy formula matching different flue temperature and sulfur concentration levels, preventing over-spec high-cost stainless steel selection for medium-temperature tail flue projects to control overall boiler overhaul budget.
3. Interchangeable structural variants (straight half wrap, flat fin baffle, U outer bend full cover) cover all mainstream heating surface layout designs, eliminating secondary on-site cutting transformation for most standard boiler tube bundles.
4. Uniform consistent alloy plate thickness design ensures synchronous wear rate across the entire half round shield surface, avoiding partial premature thinning under uneven flue particle impact distribution.
We provide full custom half round tube shield manufacturing according to customer boiler overhaul construction drawings, flue operating temperature and ash abrasion intensity parameters:
Customizable technical parameters: Matched heat transfer tube outer diameter, alloy plate thickness, half round shield total length, semicircular arc radian, wave fin baffle height, outer bend wrap coverage angle.
Special custom options: Ultra-thick enhanced wear-resistant alloy plate, oversized U outer bend wrap shield, pre-welded integrated shield + snap ring assembly for fast field installation.
Attached technical supporting service: Boiler anti-abrasion scheme consultation, on-site installation technical guidance, long-term bulk spare parts supply framework contract for thermal power plant annual maintenance cycles.
Half round tube shields adopt layered isolation shockproof packaging to protect stamped semicircular arc structure from extrusion deformation during cross-border sea and land long-distance transportation:
Small batch small-size half round shields separated by foam isolation paper and packed into fumigated export wooden cases; large quantity bulk finished products stacked on standard steel pallets, fixed with steel binding strips, whole pallet wrapped with anti-rust stretch plastic film outside.
Multiple international trade terms FOB / CFR / CIF are supported, sea freight and land highway transportation options available based on customer delivery port and delivery schedule requirements.
Each shipment batch attached complete delivery documents: Alloy material spectral test report, dimensional inspection record, installation operation manual, convenient for overseas power plant project customs clearance and equipment acceptance inspection.
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.
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.
