Finned Tube Shields
Finned Tube Shields - seamless steel tube
Certified stainless steel half round split sleeve, Type A structural reinforcement / Type B full pressure containment two types, on-site install without pipe cutting, high temperature & corrosion resistant for power plant & petrochemical equipment.
Based on Excel Metal's half pipe sleeve core product standard, Stainless Steel Half Round Pipe, also named stainless half sole split sleeve, is a 180° semicircular half-wrap stainless steel component rolled by pressure vessel grade stainless plate. It has two core application categories: pipeline repair sleeve and reactor heat jacket D-shaped half round tube.
Different from ordinary carbon steel repair sleeves, we adopt 304, 316L, high-temperature resistant 310S stainless steel raw materials, low carbon equivalent formula ≤0.45, meet ASME pressure vessel welding standards. Split open half sole structure allows direct wrapping on damaged pipes without cutting the whole pipeline, greatly shorten overhaul shutdown time.
Two standard models: Type A non-pressure structural reinforcement sleeve (only longitudinal weld for non-leak thinning pipe) and Type B full pressure containment sleeve (with matching stainless backing strip, full circumferential sealing weld for perforated leaking tubes). Widely used for thermal power boiler 20G tubes, petrochemical corrosion pipelines, fermentation reactor heating jacket supporting matching with our half repair pipe sleeves, 20G seamless base pipes and boiler anti-abrasion shields.
304 / 316L / 310S stainless steel plate, carbon equivalent controlled ≤0.45, complete MTR material certification, low weld cold crack risk, long service under high temp sulfur flue & chemical corrosive medium.
180° semicircular split structure can be directly wrapped around the damaged pipe outer wall, no need to cut off full pipe segment or disassemble pipeline supports, minimize production shutdown loss during overhaul.
Type A only longitudinal side weld for non-through-wall wall thinning; Type B equipped matched stainless backing strip with full end circumferential weld to fully contain internal medium pressure and fix leakage permanently.
Full fusion welding forms integral composite structure with base pipe, recover original design pressure bearing capacity, anti-scour & anti-corrosion far superior to detachable clamp shields.
Custom half round sleeve size per boiler/pipeline drawing, 90° / 180° arc optional, wall thickness ≥ matching base pipe nominal wall thickness.
Excel Metal standard matched stainless backing strip for Type B sleeves, prevent weld root burn-through during full pressure sealing welding.
Suitable for power plant boiler tubes, oil & gas pipelines, chemical reactor heat jackets, sewage anti-corrosion pipelines, matched with full series pipeline maintenance accessories.
No end circumferential welding groove, only two longitudinal side edges for fillet weld. Used for pipes with surface pitting, uniform wall thinning without through-wall leakage, only provide structural reinforcement without medium sealing function, low welding workload for medium abrasion boiler zones.
Pre-machined backing strip installation groove on both sides, supplied with same stainless matched backing strip. Complete longitudinal + two end circumferential full sealing weld, can fully bear pipeline operating pressure, solve perforation, weld crack and medium leakage permanent repair.
| Stainless Grade | Max Continuous Temp | Anti-Corrosion Performance | Applicable Sleeve Type | Typical Working Condition |
|---|---|---|---|---|
| 304 Stainless Steel | ≤750℃ | Medium sulfur / weak acid resistance | Type A / Type B | Low-sulfur economizer boiler tubes, municipal water pipelines |
| 316L Stainless Steel | ≤850℃ | Excellent chloride & medium sulfur resistance | Type B priority | Petrochemical corrosive pipelines, sewage pipes |
| 310S Stainless Steel | ≤1150℃ | High temp high sulfur flue resistant | Type A / Type B | CFB furnace superheater & reheater tubes |
Material Selection Tip: High-temperature high-sulfur power plant boiler elbow repair select 310S stainless half round sleeve; chemical leaking pipeline repair adopt 316L Type B sleeve with backing strip.
| Matching Pipe OD (mm) | Sleeve Wall Thickness (mm) | Single Repair Length (mm) | Available Stainless Grade |
|---|---|---|---|
| 32 / 38 / 42 / 51 / 57 | 3.0 ~ 6.0 | 100 ~ 800 | 304 / 316L |
| 60.3 / 76 / 89 / 108 | 4.0 ~ 8.0 | 200 ~ 1500 | 304 / 316L / 310S |
| 114 / 168 / 219 | 6.0 ~ 12 | 300 ~ 3000 | 310S high temp priority |
Note: Special bend radius, ultra-thick high-pressure stainless half round sleeve can be customized by developing exclusive rolling molds per engineering drawings.
Welding matching stainless electrode corresponding to sleeve grade; 310S sleeve preheat to 200℃ before welding to prevent cold cracks.
| Product Name | Material | Installation Mode | Core Purpose |
|---|---|---|---|
| Stainless Steel Half Round Pipe Sleeve | 304/316L/310S Stainless | Permanent full weld | Repair corroded / leaking boiler & chemical pipes | Carbon Steel Half Repair Sleeve | A516 / A36 Carbon Steel | Permanent full weld | General low-corrosion pipeline reinforcement |
| U-Type Outer Half Round Shield | 410/309S Stainless | Clamp detachable | Pre-protect intact new boiler elbows |
| 20G Seamless Base Pipe | 20G Carbon Steel | Raw substrate | Original boiler heating tube matched repair sleeve |
Stainless half round pipe sleeves follow Excel Metal industrial application standards, widely used in four major engineering sectors:
Core repair defects: Long-term fly ash abrasion thinning, sulfur corrosion pitting, weld thermal fatigue crack, medium through-wall perforation leakage.
| Comparison Item | Type A Stainless Sleeve | Type B Stainless Sleeve |
|---|---|---|
| End Circumferential Weld Groove | No | With backing strip mounting groove |
| Matching Backing Strip | Not required | Supplied as standard accessory | Medium Pressure Containment | Cannot seal leakage | Fully bear full pipeline operating pressure | Suitable Pipe Defect | Non-through-wall thinning / surface pitting | Through crack / perforation / medium leakage |
| On-Site Welding Workload | Low, only longitudinal seam weld | High, side + two end full weld |
| Main Application Scenario | Prevent further abrasion on intact thin tubes | Permanent leak-free emergency pipeline repair |
1. Preheating rule: 310S high-temperature stainless sleeve preheat to 200℃ before welding, slow insulated cooling after welding to eliminate cold cracks.
2. Mandatory NDT: All Type B leakage repair sleeves require 100% PT penetration test after welding to eliminate hidden leakage points.
3. Annual shutdown inspection focus: Use ultrasonic thickness gauge to detect stainless sleeve and base pipe wall thickness, check weld crack growth.
4. Pre-install cleaning: All corrosion & oxide layer on pipe surface must be fully polished clean to guarantee full welding fusion.
5. Warehouse storage: Separate stainless sleeves with anti-rust paper, dehumidify warehouse to avoid surface rust staining before delivery.
1. Split half sole open structure realizes online repair without cutting full pipeline, drastically reduce production shutdown economic loss.
2. Three stainless grade gradient matching (304 / 316L / 310S) cover low to ultra-high temperature sulfur-containing flue working conditions.
3. Dual Type A/B structural design distinguishes reinforcement & leak sealing two overhaul demands, avoid over-spec material cost waste.
4. Matched stainless backing strip for Type B sleeves solves weld root burn-through problem, improve pipeline long-term sealing safety.
5. Low carbon equivalent stainless plate meet pressure vessel welding standards, stable metallurgical combination with 20G / alloy boiler tubes without galvanic corrosion.
Customizable technical parameters: Matching pipe outer diameter, sleeve wall thickness, single repair length, Type A / Type B structural selection, stainless grade 304/316L/310S.
Special custom options: Ultra-thick high-pressure stainless sleeve, small diameter boiler dedicated mini half round pipe, 90° short arc partial repair sleeve.
Attached technical service: On-site pipeline defect assessment, welding construction guidance, long-term power plant overhaul bulk framework contract preferential price.
Stainless half round sleeves adopt full anti-rust protection for semi-circular arc surface during transportation:
Small batch small OD sleeves: Separately wrapped anti-rust oil paper, packed into fumigated wooden boxes with foam buffer filler.
Large size heavy stainless sleeves: Stack with rubber isolation pads, fixed on steel pallets, full black anti-rust stretch film wrapped whole pallet.
Support FOB / CFR / CIF trade terms, sea & land combined transport. Each shipment attached full MTR, inspection & NDT documents for project customs acceptance.
The half repair sleeve is a versatile component used in pipeline maintenance and repair to reinforce damaged sections and ensure the integrity of the pipeline.
Pressure containing sleeves feature a wall thickness equal to or greater than required for the maximum allowable operating pressure or the full strength of the pipe being repaired. The half repair sleeve material is certified and the carbon equivalent will not exceed 0.45 percent. Each half-sole segment comes with one pre-crimped back-up strip. Half pipe sleeves can be used as pads or cradles for above ground piping, drain tile supports and patches (segments in 90° and 180° arcs, from 6-inches to 10 feet in length are available as specials). Each Half pipe sleeve has standard bevels with a back-up strip and material certifications. Sleeve ends are square cut.
The steel repair sleeves can be used for internal and external corrosion, gouges, dents, grooves, arc burns, cracks, defective girth welds, laminations and leaks.
Pressure containing sleeves feature a wall thickness equal to or greater than required for the maximum allowable operating pressure or the full strength of the pipe being repaired. The steel Repair sleeve material is certified and the carbon equivalent will not exceed 0.45 percent. Each half-sole segment comes with one pre-crimped back-up strip.
Steel Repair Sleeves can be used as pads or cradles for above ground piping, drain tile supports and patches (segments in 90° and 180° arcs, from 6-inches to 10 feet in length are available as specials).
Each Steel Repair Sleeve has standard bevels with a back-up strip and material certifications. Sleeve ends are square cut. Back-up strip are not included with Standard Girth Weld Steel Repair Sleeves but are available as special order.
The half pipe sleeves can be used in case of leaks, dents, corrosion, cracks & faulty girth welds. Every repair sleeve are provided with standard bevels with a backup strip.
Material used are structural quality carbon steel or pressure vessel quality carbon steel plates, which are to ASTM specifications, and in the following grades:
The chemical composition does not exceed the percentages specified for the ASTM material ordered. Repair sleeves are fabricated from plate with low carbon equivalency for good weld ability.
The maximum allowable carbon equivalency (CE) quality carbon steel plates will be based on the heat analysis.
The maximum allowable carbon equivalency (CE) pressure vessel quality carbon steel plates will be based on the heat analysis, in most cases.
Note: The sleeve can be manufactured in any grade as per the application & client requirements.
Our half pipe sleeve are manufactured from the best quality carbon steel material. We pride ourselves on making the half sole by rolling, die forming and step braking and they never undergo heat treating. Thus making our expertise & technique best in the industry. If a client specifically asks for longitudinal edges of the half pipe sleeve to be beveled for welding, it can be done. Half pipe sleeves ends have shaved square edges to enable fillet welding, although square end bevel can also be made as per client specification. Our for repair sleeves are made with carbon steel plates with low carbon equivalency to ensure good weld ability.
Half Pipe Sleeve can be milled on the inside longitudinal edges for the backing strips. Depth of 1/16~(.0625) -0~+ 1/32~and width of 5/8~(.625) -0 + 1/16~on each side. Outside longitudinal edges are beveled 30° (+5° ~0° ) for welding.
Backing Strips
Backing strips are hot rolled commercial carbon steel sheet and strip of commercial quality, A-569/A1011 SS GR33 in coils and cut lengths having a maximum carbon of 0.15%. 1 1/4~wide, 16 gauge (.0598) with a tolerance of: min..0538 ~max. 0658, 10~long, pre-crimped (10 degree total bend).
All of our sleeves are manufactured from quality, carbon steel material, all of which are up to ASTM/ASME specifications. We keep copies of material test reports on file and verify heat numbers prior to producing all parts.
We can manufacture half pipe sleeve in any custom steel grades and of any size as per the application & requirement of the customer.
Inspection Of Half Pipe Sleeves
Every half sleeve is meticulously examined and inspected for defects before delivery. The shipment is thoroughly tested and verified for durability and stability.
Our quality experts first review the entire shipment of half pipe sleeves before we dispatch them to our clients. Parts that do not meet our strict standards are rejected and not shipped.
Mill test reports will be furnished on all materials. Stock plate is not available with a maximum hardness guarantee. Independent testing may be performed to check the hardness on stock plate. Additional independent testing available to include: destructive, magnetic particle, liquid penetrate, ultrasonic and radiographic.
Longitudinal edges are beveled to 30 degrees (+5 degrees -0 degrees), with a root face (land) of 1/16~(+-1/32~. This will be a mechanical type bevel or by plasma torch burning. Beveled ends are available upon request. Inside diameter of each Half Pipe Sleeve is fabricated to match the outside diameter of standard nominal line pipe. Half Pipe Sleeve are manufactured so that when two halves of the sleeve are placed on the pipe, their total circumference shall equal the circumference of the pipe minus a gap between the longitudinal edges on either side of 1/16~(-1/16~1/32~ for welding.
Every half sleeve pipe is marked for the size, thickness, dimension & grade of steel before shipping across India & abroad. Any half sleeve pipe not meeting the requirements for visual inspection or dimensional tolerance are rejected.
Half pipe sleeves are designed to avoid costly shutdowns. Existing lines can be cased with no loss of throughput, as there is no need to shut down the carrier line to make the required repair.
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.
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.
