1. Finned Tube 4 Inch x 8.6 MW (SA 213 Gr T22):

   - This tube is designed for high-temperature applications and is constructed with SA213 Gr T22 material, known for its excellent resistance to high temperatures and corrosion. With an outer diameter of 114.3mm (4 Inch) and a thickness of 8.6mm, it provides robustness while maintaining thermal efficiency. The bevel cut ends at a 37.5-degree angle ensure precise fitting. Its finned length of 15.950mm, along with the bare lengths of 50mm at both ends, contributes to its overall length of 16.050mm. The tube is equipped with 236 fins per meter, each with a thickness of 1.24mm and a height of 19.1mm, providing optimal heat transfer. The fins, made of SUS 410 material, ensure durability and thermal conductivity. The helical spiral winding finned pipe design enhances surface area for improved heat transfer efficiency. This specification includes 9 units, each accompanied by a Mill Certificate, certifying compliance with ASME standards.

2. Finned Tube 4 Inch x 7.8 MW (SA 213 Gr TP 304H):

   - Tailored for applications requiring corrosion resistance and thermal performance, this tube is crafted from SA213 Gr TP 304H material, renowned for its resistance to corrosion in various environments. With the same outer diameter and cut end specifications as the previous tube, it provides efficient heat transfer with its 15.950mm finned length. The 18 units included feature a fin height of 12.7mm, providing ample surface area for heat exchange. Like the previous tube, each unit comes with a Mill Certificate, ensuring quality and compliance.

3. Finned Tube 4 Inch x 7.8 MW (SA 213 Gr TP304H):

   - Similar to the previous tube in material and design, this variant features a different bare length on one end, extending to 215.4mm, resulting in an adjusted overall tube length of 16.215,4mm. It offers the same fin configuration and specifications, with 9 units provided, each accompanied by a Mill Certificate.

1. Elbow 180° SR, Size 4 Inch x 7.8MW x 203mm-C-C:

   - Fabricated from SA 403 GR WP 304H material, these elbows ensure durability and corrosion resistance in demanding environments. With 27 units included, each elbow is designed to facilitate smooth fluid flow and is accompanied by a Mill Certificate, guaranteeing compliance with ASME standards.

2. Elbow 180° SR, Size 4 Inch x 8.8MW x 203mm-C-C:

   - Constructed from SA 234 GR WP 22 material, these elbows are suitable for high-pressure applications. With 9 units provided, each elbow ensures reliable performance and adherence to standards, as indicated by the accompanying Mill Certificate.

- The inclusion of 4 units of inter-tube supports, crafted from A351 GR HK 40 material, ensures stability and support for the system, enhancing its structural integrity.

ASTM A351 Grade HK40 is a heat-resistant stainless steel alloy designed for high-temperature applications such as calcining tubes, kiln components, and radiant tubes. Its high chromium (23–27%) and nickel (19–22%) content offers strong oxidation resistance, allowing it to perform well in both oxidizing and reducing environments at temperatures up to 1,025°C (1,875°F). The alloy has a minimum tensile strength of 425 MPa, yield strength of 240 MPa, and elongation of 10%, making it an ideal choice for components exposed to intense thermal conditions.

- The fin tube assembly designed for use in a heat exchanger, which includes a carbon steel tube, a carbon steel fin, and an external brazing compound made from a material chosen from nickel, chrome, copper, aluminum, zinc, and graphite. This brazing compound is applied to bond the tube and fin securely. Additionally, the document outlines a method for fabricating this assembly, as well as a power plant that incorporates it. The brazing compound not only helps to secure the tube and fin together but also serves to protect the carbon steel from corrosion.

Helical Spiral Winding Finned Pipe