Tubes are flexible to allow for proper expansion and resistance to thermal shock.
The tubes are press-fitted into the drums using a ferrule attachment. Top and bottom ferrules are factory ewelded to each tube, in accordance with the ASME Code. Each unit is subjected to a hydrostatic pressure test, in accordance with the ASME Code, and supervised by an Authorized Inspector to ensure compliance. Balanced Flow Tangent tube design is symmetrical to ensure fast, uniform, and balanced circulation throughout the boiler, with maximum heat transfer and operating efficiency. The patented symmetrical design and arrangement profides a very compact watertube package and requires a minimum of space in the boiler room.