The main purpose of HRSG Finned Tube is to enhance heat transfer surface area of gas-to-tube heat exchanger in the heat recovery steam generator. The gas turbine exhaust gas may be fed into an HRSG at temperatures of approximately 500°C to 650°C, which results in different thermal conditions in the various parts of the economizer, evaporator, superheater and reheater. The material used for the tube and the type of construction for the fins should then be chosen based on temperature, pressure, gas and heat transfer requirements. For higher temperature and pressure service sections carbon steel and alloy steel finned tubes can be specified and the type of fin attachment is determined based on the operating conditions. The density of the fin, tube size, wall thickness and material grade may also be customizable depending on the project requirements. Amardeep Steel is a seasoned HRSG Finned Tubes Manufacturers and Suppliers in India, offering custom-made Finned Tubes, engineered to meet specific thermal and mechanical needs.
Technical Data
Specifications of HRSG Finned Tubes
Parameter | Specification / Available Capability |
|---|---|
Base Tube Outer Diameter (OD) | 19.05 mm to 88.9 mm (3/4" to 3.5") |
Base Tube Wall Thickness | 1.65 mm to 10.0 mm (dependent on pressure rating) |
Tube Lengths | Up to 20 meters straight lengths |
Base Tube Materials | • Carbon Steel: ASTM A179, ASTM A192, ASTM A210 Gr A1/C • Alloy Steel: ASTM A213 T11, T22, T91, T92 • Stainless Steel: ASTM A213 TP304/304L, TP316/316L, TP347H |
Fin Materials | Carbon Steel, Low-Alloy Steel, Stainless Steel (304/316), Aluminium (1060/6063) |
Fin Height | 9.5 mm to 31.75 mm (3/8" to 1-1/4") |
Fin Thickness | 0.8 mm to 2.5 mm |
Fin Pitch / Density | 120 to 287 fins per meter (3 to 7.5 fins per inch) |
Fin Types Available | Solid Helical, Serrated (Segmented), Extruded Bi-Metallic, Embedded (G-type) |
Chemical Compositions of HRSG Finned Tubes
Material / Specification | Grade / Type | C % | Mn % | Si % | Cr % | Mo % | V % | Al % | Ni % |
|---|---|---|---|---|---|---|---|---|---|
Low Carbon Steel | 0.06 – 0.18 | 0.27 – 0.63 | 0.25 max | — | — | — | — | — | |
Grade A1 (Carbon Steel) | 0.27 max | 0.93 max | 0.10 min | — | — | — | — | — | |
Grade B (Carbon Steel) | 0.30 max | 0.29 – 1.06 | 0.10 min | 0.40 max | 0.15 max | 0.08 max | — | 0.40 max | |
Grade T11 (Low Alloy) | 0.05 – 0.15 | 0.30 – 0.60 | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 | — | — | — | |
Grade T22 (Alloy Steel) | 0.05 – 0.15 | 0.30 – 0.60 | 0.50 max | 1.90 – 2.60 | 0.87 – 1.13 | — | — | — | |
Grade T91 (High Alloy) | 0.08 – 0.12 | 0.30 – 0.60 | 0.20 – 0.50 | 8.00 – 9.50 | 0.85 – 1.05 | 0.18 – 0.25 | — | 0.40 max | |
ASTM A213 / SA213 | TP304H (Stainless Steel) | 0.04 – 0.10 | 2.00 max | 0.75 max | 18.0 – 20.0 | — | — | — | 8.00 – 11.0 |
ASTM B209 | Aluminium 1060 (Fin) | 0.05 max | 0.03 max | 0.25 max | — | — | — | 99.6 min | — |
HRSG Finned Tubes Mechanical Properties
Standard / Grade | Tensile Strength (min)MPa (ksi) | Yield Strength (min)MPa (ksi) | Elongation (min)% in 2 in. / 50 mm | Max Hardness(HBW / HRB) |
|---|---|---|---|---|
ASTM A179 / SA179 | 325 (47) | 180 (26) | 35 | 72 HRB / 137 HBW |
ASTM A210 Grade A1 | 415 (60) | 255 (37) | 30 | 79 HRB / 143 HBW |
ASTM A106 Grade B | 415 (60) | 240 (35) | 30 | 79 HRB / 143 HBW |
ASTM A213 Grade T11 | 415 (60) | 205 (30) | 30 | 85 HRB / 163 HBW |
ASTM A213 Grade T22 | 415 (60) | 205 (30) | 30 | 85 HRB / 163 HBW |
ASTM A213 Grade T91 | 585 (85) | 415 (60) | 20 | 250 HBW / 25 HRC |
ASTM A213 TP304H | 515 (75) | 205 (30) | 35 | 90 HRB / 192 HBW |
Equivalent Grades of HRSG Finned Tubes
ASTM / ASME Standard | UNS Number | EN / DIN Standard | EN Steel Name / Number | BS Standard | JIS Standard |
|---|---|---|---|---|---|
ASTM A179 | K01200 | EN 10216-2 | P235GH / 1.0345 | BS 3059 Part 1 320 | JIS G3461 STB340 |
ASTM A210 Gr A1 | K03501 | EN 10216-2 | P265GH / 1.0425 | BS 3059 Part 2 440 | JIS G3461 STB410 |
ASTM A106 Gr B | K03006 | EN 10216-2 | C22 / 1.0405 | BS 3602 Part 1 410 | JIS G3454 STPG370 |
ASTM A213 T11 | K11597 | EN 10216-2 | 13CrMo4-5 / 1.7335 | BS 3059 Part 2 620-460 | JIS G3462 STBA23 |
ASTM A213 T22 | K21590 | EN 10216-2 | 10CrMo9-10 / 1.7380 | BS 3059 Part 2 622-490 | JIS G3462 STBA24 |
ASTM A213 T91 | K90901 | EN 10216-2 | X10CrMoVNb9-1 / 1.4903 | BS 3059 Part 2 91 | JIS G3462 STBA26 |
ASTM A213 TP304H | S30409 | EN 10216-5 | X6CrNi18-10 / 1.4948 | BS 3059 Part 2 304S51 | JIS G3459 SUS304HTB |
HRSG Finned Tubes Dimensions Chart
Governing Material Grade | Base Tube OD (mm) | Wall Thickness (mm) | Fin Type | Fin Height (mm) | Fin Pitch (FPI) | Approx. Finned OD (mm) |
|---|---|---|---|---|---|---|
ASTM A179 | 19.05 – 38.10 | 1.65 – 3.20 | Solid / Serrated (HF) | 9.5 – 19.0 | 4 – 8 | 38.1 – 76.2 |
ASTM A210 Grade A1 | 25.40 – 50.80 | 2.11 – 4.57 | Solid / Serrated (HF) | 12.7 – 25.4 | 3 – 7 | 50.8 – 101.6 |
ASTM A213 T11 / T22 | 31.75 – 63.50 | 2.77 – 6.02 | Solid / Serrated (HF) | 12.7 – 25.4 | 3 – 6 | 57.2 – 114.3 |
ASTM A213 T91 | 38.10 – 76.20 | 3.20 – 7.11 | Solid / Serrated (HF) | 15.9 – 25.4 | 2 – 5 | 69.8 – 127.0 |
ASTM A213 TP304H | 25.40 – 88.90 | 2.11 – 6.02 | Solid / Serrated (HF) | 9.5 – 25.4 | 3 – 7 | 44.4 – 139.7 |
Specifying tubes for an economizer, evaporator or superheater bank? Send us the gas inlet temperature and pressure class and we'll confirm the right base tube grade and fin type.
Speak to Our HRSG Team
Applications and Industrial Uses of HRSG Finned Tubes
- Combined-Cycle Power Plants
- Gas Turbine Exhaust Heat Recovery
- Cogeneration Plants
- Waste Heat Recovery Systems
- Industrial Steam Generation
- Process Heat Recovery Units
- Heat Recovery Boilers
- Combined Heat and Power (CHP) Plants
Frequently Asked Questions
What are HRSG Finned Tubes?
HRSG Finned Tubes are tubes with extended fin surfaces used in Heat Recovery Steam Generators to increase the heat-transfer area and recover heat from hot exhaust gases.
How do HRSG Finned Tubes improve heat transfer?
The fins increase the external surface area of the tubes, allowing more heat to transfer from exhaust gases to the water or steam inside the tubes.
What types of finned tubes are used in HRSG systems?
HRSG systems commonly use welded finned tubes, solid finned tubes, serrated finned tubes, and other fin constructions selected according to operating conditions.
What is the purpose of fins in HRSG tubes?
Fins increase the heat-transfer surface area, helping the HRSG recover more heat within a compact tube bundle.
Are HRSG Finned Tubes suitable for economizers?
Yes. HRSG Finned Tubes can be used in economizer sections to transfer heat from exhaust gases to the feedwater before it enters the steam-generating sections.
Can HRSG Finned Tubes be customized to project requirements?
Yes. Tube material, dimensions, wall thickness, fin type, fin density, and tube length can be specified according to project requirements.
