T-WELDED STEEL PIPE CORROSION

T-welded steel pipe when containing Ni in an acidic environment corrosion resistance, containing sulfuric acid or hydrochloric acid environment, the T-welded steel pipe in Ni content, the higher the corrosion resistance is stronger. Under normal circumstances, simply add Cr in the T-welded steel pipes can be prevented in the erosion phenomenon. Poor strip edge condition is another important reason for the wrong side. Mass flow, heat flux density and structural parameters (curvature diameter spiral welded steel pipe and tees diameter ratio Dc / D) Effect of changes in the boiling heat transfer coefficient in the vertical spiral saturated bubbly.

T-welded steel pipe production, the wrong side have occurred, many influencing factors. In practice, often by a dry wrong side super differential leaving the steel pipe downgrade. Therefore, analyze the causes and preventive measures Spiral Pipe wrong side produced is necessary.

Because of the poor do not trimming the strip head and tail shape and size precision, easy to cause docking strip hard bend caused by the wrong side. Simulation parameters: Vertical Tube: diameter D = lOmm, tube length L = 660mm; three kinds of vertical T-welded steel pipe: diameter D = 10mm, change the ratio of the diameter of curvature of the T-welded steel pipe and spiral diameters were Dc / D = 15,20,25, the helical pitch Pt = 20mm, tube length, respectively, L = 503mm, L = 660mm, L = 817MM. Mass flow rate G = 200 ~ 400Kg / (m’2 · s), the heat flux q = 5 ~ 15KW / m’2, saturation pressure p, saturation = 0.414880MPa, the saturation temperature T, saturation = 283.15K.