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Standard for U bend Tubes

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 Huawei in the end of 2007, 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-688

At present Huawei has purchased the equipment for production of the following product range:

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.