FINTUBE DIVISION

Fully welded Rosink finned tubes

Rosink-Werkstätten has been worldwide developing, producing and distributing spiral and double H finned tubes made of steel since 1985 and has developed into one of the leading companies in this field. Finned tubes are the main components of economizers, heat recovery boilers and numerous other industrial heat exchanger applications. They are used for heat recovery in gas and steam power plants, district heating power plants, reactors and furnaces for the chemical and petrochemical industries. Renowned international boiler manufacturers, chemical and petrochemical companies as well as engineering and project development companies source their finned tubes from Rosink and rely on the company’s certified quality and comprehensive service.

30,000 tons finned tube production capacity per year

According to developments in the aforementioned industries, the annual production output was steadily increased. More than 10 production machines are available for the production of finned tubes. This includes several HF machines and resistance projection welding machines. Thus, customer requirements can be met quickly, reliably and flexibly, regardless of the quantity.

Single or double

Rosink H finned tubes

H finned tubes are produced as single or double tubes according to customer specifications. They are especially suitable for dusty flue gases, e.g. economizers in:

Biomass plants
Coal fired units
Oil fired units
Waste to energy plants

A straight flue gas flow and an appropriate fin spacing reduce possible soot deposits on the heating surfaces and facilitate cleaning and maintenance work.

Rosink-Wetkstätten: Rosink H finned tubes

Standard finning options for double finned tubes:

D	L(max)	L2(min)	h	w	c	t	td	p
mm	mm	mm	mm	mm	mm	mm	mm	mm
31,8	16000	100	125	27	6	2 + 2,5	65	9 — 40
31,8	16000	100	145	32	6	2 + 2,5	75	9 — 40
31,8	16000	100	150	32	6	2 + 2,5	80	9 — 40
33,7	16000	100	145	32	6	2 + 2,5	75	9 — 40
38,0	16000	100	195	42,5	10	2 + 2,5	100	9 — 40
38,0	16000	100	145	32	6	2 + 2,5	75	9 — 40
38,0	16000	100	180	40	10	2 + 2,5	92	9 — 40
42,4	16000	100	235	52,5	10	2 + 2,5	120	9 — 40
44,5	16000	100	215	50	10	2 + 2,5	110	9 — 40
44,5	16000	100	176	39	10	2 + 2,5	90	9 — 40
44,5	16000	100	196	45	6	2 + 2,5	100	9 — 40
48,3	16000	100	195	42,5	10	2 + 2,5	100	9 — 40

Overview

QUALIFIED FINNING METHOD

High-frequency helically finned tubes

Rosink spiral finned tubes are the main components of economizers, heat recovery boilers and numerous other industrial heat exchanger applications. They are available with solid fins or with segmented fins. The geometry of Rosink finned tubes is adapted to specific customer requirements and flue gas characteristics.

Solid fins

The fins are helical wounded onto the tube and the fin is continuously fully welded to the tube.

Tube with solid fins

Serrated fins

The fin strip is slotted at short intervals. A remaining height of 5 mm is left unslotted, which forms the continuous fin base. When the finstrip is helically wound onto the tube the serrated part of the finstrip devides at the outer end thus forming rectangular segments.

Tube with segmented fins

Standard fin materials

Almost any combination of tube and fin can be processed. However, the most commonly used fin materials are:

ASME	ASTM	EN	fin thickness	fintip temperature
SA1008		1.0338 (DC04)	0,8mm up to 3,0mm	max. 490° C
	A240 TP410S	1.4000 (X6Cr13)	0,8mm up to 3,0mm	max. 650° C
	A240 TP409	1.4512 (X2CrTi12)	0,8mm up to 3,0mm	max. 650° C
	A240 TP304	1.4301 (X5CrNi18-10)	0,8mm up to 3,0mm	max. 850° C
	A312 TP16L	1.4404 (X2CrNiMo17-12–2)	0,8mm up to 3,0mm	max. 850° C
	A312 TP316 Ti	1.4571 (X6CrNiMoTi17-12–2)	0,8mm up to 3,0mm	max. 850° C
	A312 TP310S	1.4845 (X8CrNi25-21)	0,8mm up to 3,0mm	max. 1000° C

Overview

Standard finning options for helically finned tubes:

ASA normal pipe	OD	Fin height min./max. NOH I‑fin solid	Fin height min./max. HF I‑fin solid	Fin height min./max. NOH I‑fin serrated	Fin height min./max. HF I‑fin serrated
1/2″	21,3 mm	6,5 – 10 mm	6,5 – 10 mm	13 – 32 mm	13 – 32 mm
	25 mm	6,5 – 13 mm	6,5 – 13 mm
	25,4 mm	6,5 – 13 mm	6,5 – 13 mm
3/4″	26,9 mm	6,5 – 14 mm	6,5 – 14 mm
	31,8 mm	6,5 – 19 mm	6,5 – 19 mm
1″	33,7 mm	6,5 – 19 mm	6,5 – 19 mm
	38 mm	6,5 – 25 mm	6,5 – 25 mm
1 1/4″	42,4 mm	6,5 – 27 mm	6,5 – 27 mm
	44,5 mm	6,5 – 29 mm	6,5 – 29 mm
1 1/2″	48,3 mm	6,5 – 31 mm	6,5 – 31 mm
	51 mm	6,5 – 32 mm	6,5 – 32 mm
	57 mm	6,5 – 32 mm	6,5 – 32 mm
2″	60,3 mm	6,5 – 32 mm	6,5 – 32 mm
2 1/2″	76,1 mm	6,5 – 32 mm	6,5 – 32 mm
3	88,9 mm	6,5 – 32 mm	6,5 – 32 mm
	101,6 mm	6,5 – 38 mm	6,5 – 32 mm
4″	114,3 mm	6,5 – 38 mm	6,5 – 32 mm
5″	139,7 mm	6,5 – 38 mm	6,5 – 32 mm
	141,3 mm	6,5 – 38 mm	6,5 – 32 mm
6″	168,3 mm	6,5 – 38 mm	6,5 – 32 mm
8″	219,1 mm	6,5 – 38 mm	6,5 – 32 mm

Overview

The fin thickness can be selected in 0.05 mm increments. The maximum fin thickness is 3.0 mm for solid fins. For segmented fins, the maximum fin strength is 2.0 mm for carbon steel. Other dimensions are available on request.