Medium-high-finned Tubes

Medium-high-finned tubes feature a significantly larger heat transfer surface area compared to plain tubes. They are ideal for compact and high-performance coils and shell-and-tube heat exchangers. Wieland medium-high-finned tubes are a proven and robust solution for water heaters, storage tanks, refrigerant condensers, oil coolers, gas coolers or safety heat exchangers and more.

Additional information

Material overview

	ASTM-UNS No.	Wieland Designation	⁠EN Designation	EN No.	JIS No.	Data Sheet
	-	A22	AlMgSi	AW-6060	-	-

Applications Available Versions Certification Technical Service

Applications

heating industry (hot water tanks)
air conditioning and refrigeration (refrigerant condensers and evaporators)
mechanical engineering (oil coolers, gas coolers)
process engineering

Operating range:

High-pressure applications up to 134 bar possible (e.g. R744)

Available Versions

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Wieland Gewa-D

Wieland GEWA-D tubes are medium high finned tubes in copper and copper alloys as well as aluminum, carbon or stainless steel. Finned tubes of this series resist very high mechanical and thermal stress.

Wieland Gewa-DW

For improved heat transfer the inner surface of GEWA-DW tubes have an additional structure. This also favors very small bending radii and coil diameters

Excerpt from the product portfolio

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Tube number	Alloy*	Tube type**	Outside diameter [mm]	Fin height [mm]	Inside diameter [mm]	Outside diameter plain end [mm]	Outside surface area [m²/m]	Approx. weight [kg/m]
D-1135.12100-00	K21	D \| DW	19.00	3.50	10.00	15.00	0.18	0.62
D-1135.14100-00	K21	D \| DW	21.00	3.50	12.00	18.00	0.20	0.72
D-1135.18100-00	K21	D \| DW	25.50	3.50	16.50	22.00	0.26	0.94
D-1145.18100-00	K21	D	27.50	4.50	16.50	22.00	0.33	1.04
DW-1132.12085-16	K21	DW	19.00	3.20	10.90	15.88	0.16	0.61
DW-1135.18080-16	K21	DW	25.50	3.50	16.90	22.00	0.26	0.81
DW-1133.12079-16	L10	DW	19.05	3.30	10.87	15.88	0.17	0.57
DW-1133.25125-16	L10	DW	31.75	3.37	22.51	28.58	0.33	1.40
D-1135.14175-00	A22	D	21.00	3.50	10.50	16.10	0.20	0.29
DW-1145.11122-16	A22	DW	20.00	4.50	8.56	14.80	0.22	0.23
D-1145.18080-00	O60	D	27.00	4.50	16.40	21.30	0.32	0.90

Tube number code system (example D-1135.14100-00)

D-

35.

100

-00

Tube type

Fins/inch

Fin height
[1/10 mm]

Core-tube diameter
[mm]

Wall thickness
[1/100 mm]

Inner structure
(00 = plain)

Length [mm]	Length tolerances
< 2,000	+ 2 mm
2,000 - 8,000	+ 1 ‰ (max 5 mm)
> 8,000	+ 0.7 ‰

Production and Processing

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The fins are obtained by roll forming the outer surface of a plain tube. This process results in an increase in strength of the finned sections. Plain ends remain soft and have a smaller diameter than fined sections. Soft annealing of the tubes is necessary if they must be suitable for coiling or bending to heat exchangers.

Materials

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We offer the widest range of material in the industry and can extend it on request in case of special requirements for heat conductivity, mechanical properties or corrosion resistance. Medium-high finned tubes from Wieland Thermal Solutions are available in copper, copper-nickel, aluminium and carbon steel as well as in stainless steel in limited range.

Copper and copper alloys: withstand the highest mechanical and thermic stress. They are specially made for the individual geometries of complex heat exchangers. Copper offers the highest heat conductivity of all technical metals. It is superior in processing, hygienic and a corrosion resistant solution.
Aluminum: specifically used in light-weight applications. Aluminium combines highest ductility with reasonable heat conductivity.
Carbon steel: used in applications such as solid-fuel boilers or storage tanks. The significantly enlarged surface area compared to plain tubes allows compact solutions. Ready to install heat exchangers can be an interesting alternative solution for heat exchangers made of costly materials.
Stainless steel: used for condensing boilers or domestic hot water applications. Due to the enlarged outside heat transfer surface area the required tube length can be reduced and thus costly material can be saved.

Certification

The primary material complies with the requirements of DIN EN 12451, AD-2000 Merkblatt W6/2 and on request with ASTM B111 or ASTM B75. For aluminum, carbon or stainless steel individually standards agreed with the customer can be applied.

GEWA-D finned tubes are manufactured acc. to Wieland standard R-2200 and DIN EN 12451. On request, a production acc. to VdTÜV 420/2 (harmonized with the European Pressure Equipment Directive PED 2014/68/EU) or ASME SB 359/ASTM B359 is possible.

To ensure consistent product quality, Wieland-Werke AG has a sophisticated quality control system according to DIN EN ISO 9001:2015 which has been verified and certified by an independent certification company. Our test laboratories in the Central Laboratory and Development Services have been accredited to DIN EN ISO/IEC 17025:2018 and DIN EN ISO 9001 as test and certification laboratories.

Technical Service

Our Technical Marketing experts are available at any time as contact partners to work together with your experts from the very early product planning stages in order to obtain optimum results for the manufacturing stage and for your application. The only way to find the best, most cost-effective solution is by means of comprehensive technical consultation based on computerised thermal engineering rating.