Rifled tubes are used in boilers to provide highly energy efficient means of heat transfer. The presence of the internal rifling induces centrifugal forces in the mass flow thereby separating the water from the steam fraction and forcing the water towards the tube wall. As a result of this phenomenon and the increase in internal surface the following advantages accrue:
•Improved heat transfer rate even at higher steam quality levels
•Very good heat transfer even at low mass flux levels
•Reduction in mean metal temperature of the tube wall
•Ability to increase heat transfer rate by optimizing rifling geometry
cts are suitable for making water wall in power plant boilers which is able to eliminate steam film inside ol tubes and improve the rmal efficiency.
★ The products are produced by cold drawing method to forming internal spiral ribs with special geometry size. Finished products shall be heat treated in atmosphere controlled furnace to achieve stable mechanical properties and good su rface quality.
★ The products can be ordered according to customers`design requirements.
★ Main steel grades：20G,25MnG,15CrMoG,SA-210A1/C,SA-213 T2/T12