Longda has a complete set of manufacturing and testing equipments ,which are the most
Advanced in the technical tube industry .Meanwhile ,we have established an effective
quality management system with strong execution.
We manufacture and control the products in accordance with ASTM (American Society
of Testing Materials) & ASME(American Society of Mechanical Engineers) standards.

1.Copper & Copper Alloys Tube
ASTM B75 ,ASTM B111,ASTM B359,ASME SB75,ASME SB111,ASME SB359
Chinese Standard :JB/T 10503, GB/T 19447 ,GB/T 17791,GB/T1527,GB/T 8890
DIN EN12451,DIN EN12449, EN12452, EN10204
2.Carbon Steel Tube ASTM A179 ,ASME SA179 ,ASTM A498
3.Stainless Steel Tube :ASTM A213 ,ASTM A268 ,ASTM A803
4.Titanium & Titanium Alloy Tube :ASTM B338, ASTMB861,ASME SB338 ,ASME SB861, GB/T 3624, GB/T 3625, EN17861

Fin Tube Material

Fin Tube Material	China GB	ISO	EN	UNS	JIS
Copper	TP2	Cu-DHP	CW024A	C12200	C1220
Copper	TP1	Cu-DLP	CW023A	C12000	C1201
Copper Nickel 95/5	B5	-	-	C70400	-
Copper Nickel 90/10	BFe10-1-1	CuNi10Fe1Mn	CW352H	C70600	C7060

Range of Available Dimensions

Product Category	Finned Dimensions
Absorption Chiller Fin Tube		C12200, C12000	C70600, C70400	Finished  Fin OD (mm)	WT (mm)	FPI	Norminal Wall under Fin (mm)	Ridge No. (n)		Helix Angle (°)	Ridge  Height (mm)	Fin Height (mm)
		☆	☆	16	0.65	26	≥0.45	8		43°	≥0.125	0.30
		☆	☆	16	0.60	26	≥0.45	-		-	-	0.30
		☆	☆	16	0.70	26	≥0.45	-		-	-	0.30
		☆	☆	19	0.60	26	≥0.43	-		-	-	0.30
		☆	☆	19	0.65	26	≥0.45	-		-	-	0.30

Application & Advantage

Absorption Chiller Fin Tube
The trend for absorption water chillers is toward higher efficiency and less footprint area.Nowadays,with the development of advanced technology,the lithium bromide absorption chillers have only 1/3 of the volume and 1/2
Of the weight than they were in previous designs.Meanwhile,the heat transfer performance has increased more
Than 1/3 .This can be attributed to the application of the new technical tubes with improved thermal performance.
We have developed a series of fin tubes with upgraded heat transfer performance specialized for different heat exchanger components of absorption chillers.This kind of tubes are designed and improved to optimize the absorber,evaporator,condenser ,etc ,due to their perfect surface hydrophilicity , outstanding heat transfer performance as well as supper light weight.