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U-Bend Tube

U-bend tubes are widely used in heat-exchanger systems. Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields — nuclear and petrochemical machine building.

A tube-bending line, that was installed at our factory in the end of 2005, allows to produce U-tubes 

as per such standards:

1. ASTM A688/A688M

2. ASTM A803/A803M

3. ASTM A556/A556M, ASME SA-556

4. ASME SA-179/SA213

Steel Grades:
Carbon & Alloy	Ferrite	Austenite	Duplex	Super Duplex	Ni-alloys	Titanium
A179 T11 T12 T22	TP410	TP 304 /  304L TP 316 /  316L TP 316Ti TP 317 /  317L TP 321 TP347	S31803 S32205	S32750 S32760	N06600 N08020 N00880 N08825 N08904	Gr.2

Tubes of other alloys and steel grades can be produced upon agreement.
Technical requirements
Straight tubes for bending:
ASTM/ASME SA 179; SA 213; ASTM B 163; ASTM B 729; ASTM B 407; ASTM B 423; ASTM A 789
U-bend Tubes:
-TEMA RCB 2.31 Standards of the Tubular Exchanger Manufacturers Association (9th edition).
-ASTM A688 Standard specification for welded tubes of austenite corrosion resistant steel grade designed for feed water boilers.
-ASTM B163 Standard technical requirements for tubes of nickel and nickel alloy for condensers and heat exchangers.
-Customer specifications.

u bending

BENDING RADIUS: from 1.5 OD to 1250 mm.
When ordering tubes with R=1.5D it is necessary to agree precision of geometrics.
STRAIGHT TUBES MAXIMUM LENGTH (before bending): 26000 mm.
LEG LENGTH: min 1 meter, max 10.5 meters (for max R=1250 mm)
Note: other sizes are available upon agreement.
HEAT TREATMENT: Stress Relieved after U bending.
HYDROSTATIC TEST: maximum test pressure 600 bar, soaking 10 sec. with demineralized water. Compressed air cleaning after hydro-test.
Marking: before bending by marking machine all over the tube length (bent section after heat treatment without marking).
Marking is also possible after bending on the straight parts of U-bent tube.
Packaging: closed wooden boxes of corresponding dimensions for each tube length, radius, diameter, according to PO requirements or in bundles wrapped in polyethylene film with plastic clamping spacers on each tube.