Integral Finned Tube increases the heat transfer performance by making spiral fins outside, the heat transfer performance becomes 1.6-2.0 times.

The standard size of integral finned tube is as follows.

Material size Diameter/thickness(average)	Number of fins _{(Fins per 1 inch)}	Fin Outside diameter	Root diameter	Bottom of fin Minimum thickness	Outer surface area average (m²/m)	Ratio of surface area Outer surface/Inner surface	Product number
15.88/1.91	19	≦15	12.70	1.27	12.34/10^-2	3.99	OKK-194056
15.88/2.11		≦15	12.70	1.47	12.34/10^-2	4.18	OKK-194065
19.05/1.65		≦19.15	15.88	1.12	15.12/10^-2	3.60	OKK-195049
19.05/1.91				1.27		3.69	OKK-195056
19.05/2.11				1.47		3.84	OKK-195065
19.05/2.28				1.65		3.94	OKK-195072
19.05/2.54				1.88		4.13	OKK-195083
19.05/2.77				2.13		4.35	OKK-195095
25.40/2.54		≦25	22.23	1.88	20.67/10^-2	3.65	OKK-197083
25.40/2.77				2.13		3.83	OKK-197095
25.40/3.05				2.46		3.98	OKK-197109

General specifications are as follows. In the case you require more severe condition, always we do our .98 .55 best for your requirement.

After fin process, we do eddy current examination. On your order, we check SR for all materials.
Minimum length of middle land should be 25±5mm, minimum length of ends land should be 25±5mm.
Total imperfect length of fin ends is less than 120mm.
Maximum length of fin process is 20m. Torelance specification is ±5mm.
Bended integral finned tube is available. Bended area is available as both finned and flat.