Head Semi-circular Coil

The heat-exchange semi-circular tubes used in heads are common external cooling and heat-transfer components for pressure vessels, typically symmetrically arranged along the outer arc surface of the head. One end connects to the cooling medium supply system via an inlet pipe, while the other end returns the collected medium to a reflux line. Through heat exchange between the tube walls and the head's outer surface, these tubes remove heat from the head region, thereby controlling the head wall temperature and ensuring the overall operating temperature remains within design limits. Compared to full-jacket structures, semi-circular tubes reduce cooling medium consumption, lower overall structural weight, simplify manufacturing, and facilitate installation, making them widely used in pressure vessels with elliptical or disc-shaped heads such as reactors and high-pressure tanks. During fabrication, cylindrical tubes made of materials similar to the head body are axially split in half, pre-bent to match the head's curvature, and welded onto the head. Post-welding, a seal integrity test is conducted to prevent fluid leakage during operation.