Heat Treated Steam Longitudinal Finned Tube Heat Exchanger For Evaporators

ASTM A312 TP316L welded longitudinal finned tubes with stainless steel fins are designed for high-temperature and corrosive service applications. These tubes feature seamless, straight-seam welded construction with automatic welding process and no filler metal addition.

All pipes are heat-treated at 1900°F [1040°C] and are free of scale and contaminating exogenous iron particles. Surface finishing options include pickling, blasting, or bright annealing with optional passivating treatment.

Each tube undergoes rigorous testing including:

• Transverse/Longitudinal Tension Test
• Flattening Test
• Grain Size Analysis
• Flaring Test
• Flange Test
• Hardness Test
• Hydrostatic/Nondestructive Electric Test

For small diameter or thin wall tubes (less than 0.500 in. [12.7 mm] in outside diameter and less than 0.049 in. [1.20 mm] in wall thickness), a carbon maximum of 0.040% is required.

Longitudinal finned tubes are produced by resistance welding fins along the tube's length. The fins form a U-shaped channel where each leg creates a fin. Available in various materials including carbon/alloy steel, stainless steel (TP304, TP316L, TP321), and copper alloys (CuNi 70/30, CuNi 90/10).

• Reduces required installation space while maintaining high reliability
• Improves heat transfer efficiency in limited spaces
• Enhances heat transfer while reducing flow resistance and metal consumption

Ideal for power stations and high-temperature equipment in oil industry applications including:

• Industrial Furnaces
• Distillation Tower Systems
• Air Cooled Heat Exchangers
• Refining Units
• Petrochemical Separation Equipment
• Evaporative Condensers
• Closed Circuit Cooling Towers
• Waste Heat Boilers
• High Temperature Furnace Cooling Systems
• Nuclear Power Plant Heat Exchange Systems