ASTM B395 C28000 C44300 C68700 C70600 C71500 U Bend Copper Alloy Heat Exchanger and Condenser Tubes

ASTM B395 C28000 C44300 C68700 C70600 C71500 U Bend Copper Alloy Heat Exchanger and Condenser Tubes are manufactured in our plant as per the customer requirements.

• Prior to U-bending, tubes of Copper Alloy UNS Nos. C23000, C44300, C44400, C44500, C60800, C68700, C70400, C70600, C70620, C71000, C71500, C71520, and C72200 shall be in the annealed temper (O61), unless other- wise specified in the purchase  order.
• Prior to bending, U-bend tubes of Copper Alloy UNS Nos. C10200, C10300, C10800, C12000, C12200, and C14200 shall be in light drawn temper (H55). Tubes of Copper Alloy UNS Nos. C70400, C70600, C70620, and C72200 shall, if specified, be made in the light-drawn temper  (H55).
• Prior to bending, U-bend tubes of Copper Alloy UNS No. C19200 shall be in the annealed (O61) or light drawn temper (H55) as specified.
• Prior to bending, U-bend tubes of Copper Alloy UNS No. C71500 or C71520 shall be made in the drawn, stress- relieved temper (HR50), when specified.

The U-bend portion of tubes furnished in Copper Alloy UNS Nos. C23000, C44300, C44400, C44500, C60800, and C68700 shall be relief annealed (HR) after bending. If specified, the U-bend portion of tubes furnished in Copper Alloy UNS Nos. C70400, C70600, C70620, C71000, C71500, C71520, and C72200 shall be relief annealed (HR) after bending.

Related Standard Specification:
B153 Test Method for Expansion (Pin Test) of Copper and Copper Alloy Pipe and Tubing
B154 Test Method for Mercurous Nitrate Test for Copper Alloys
B224 Classification of Coppers
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
B846 Terminology for Copper and Copper Alloys
B858 Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys
B900 Practice for Packaging of Copper and Copper Alloy Mill Products for U.S. Government  Agencies
B968/B968M Test Method for Flattening of Copper and Copper-Alloy Pipe and Tube
E3 Guide for Preparation of Metallographic Specimens E8/E8M Test Methods for Tension Testing of Metallic  Ma-
terials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E53 Test Method for Determination of Copper in Unalloyed Copper by Gravimetry
E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods) (Withdrawn 2010)4
E112 Test Methods for Determining Average Grain Size
E118 Test   Methods   for   Chemical  Analysis   of Copper-
Chromium Alloys (Withdrawn 2010)4
E243 Practice for Electromagnetic (Eddy Current) Examina- tion of Copper and Copper-Alloy  Tubes
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical  Composition
E478 Test Methods for Chemical Analysis of Copper Alloys E2575 Test Method for Determination of Oxygen in Copper
and Copper Alloys

U Bend Tube Application

U tube heat exchangers designed for high temperature applications, especially steam condensing or hot oil systems. Application: Boiler, heat exchanger, super heater, feedwater heater, condenser. Thïs model is selected when differential expansion makes a fixed tube sheet exchanger unsuitable and when conditions preclude a floating head type (HPF) selection.


Dimensional tolerances U Bend Tube acc. to TEMA R.C.B.

1) U Bend Pipe Length of straight part -0/+5 mm
Flattening (also called “ovality”) at the bend shall not exceed 10% of the nominal tube outside diameter.
Wall thickness in bending part acc. to TEMA R.C.B 2.31

2) U Bend Tube Minimum tube wall thickness in the bend part (T min)T(min) ≥ (SW × (2×R + D))/( 2× (R+D)
where: SW is smallest wall thickness
D Nominal outside diameter
R radius

3) U Bend Tube Radius tolerance
1) for R 100 mm +/- 3 mm
2) for R ≥ 100 mm +/- 5 mm

4). U bend Pipe Straightness tolerance max. 1,5 mm per 1 m
U Bend Tube ends: plain, vertically cut to the tube axis

U Bend Tube OD in mm can be bent upon agreement: 15.8 16.0 17.0 18.0 19.05 20.0 21.3 25.4 26.7 31.8 32.0 38.1mm

U bend Tube Initial Length
Maximum lengths of 27000mm can be supplied on request

U bend Pipe Bending radius
Minimum: 1.5×OD
Maximum: 1500 mm

The dimensions for heat exchanger tube in special grades may differ from the above,please contact us.

ASTM B111 Chemical Composition

Brass Seamless Tubes Standard Specification:

Standard Specification:
ASTM B111 Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock
ASTM B395 Standard Specification for U-Bend Seamless Copper and Copper Alloy Heat Exchanger and Condenser Tubes
ASME SB466 Specification for Seamless Copper-Nickel Pipe and Tube
BS 2871-2 Specification for copper and copper alloys. Tubes. Part 2: Tubes for general purposes
EN 12451 Copper and copper alloys - Seamless, round tubes for heat exchangers
DIN1785 Wrought Copper and Copper Alloy Tubes for Condensers and Heat Exchangers
GB/T8890 Seamless Copper Alloy Heat Exchanger Tubes
JIS H3300 Copper and Copper Alloy-Seamless Pipes and Tubes
EEMUA 144 Specifications covering 90-10 Cu-Ni Piping for Offshore Applications are : Tubes Seamless and Welded Publication
EEMUA 234 UNS 7060X - 90/10 Copper nickel alloy piping for offshore applications (Incorporating EEMUA 144, 145 and 146)
DIN1785 Wrought Copper and Copper Alloy Tubes for Condensers and Heat Exchangers
EN 12451 CuNi10Fe1Mn CuZn20Al2As CuZn28Sn1As CuNi30Mn1Fe Copper and Copper Alloys Seamless Round Tubes for Heat Exchangers
DIN 86019 Seamless Tubes Made of CuNi10Fe1.6Mn for Pipes - Dimensions for Standard Tubes and Precision Tubes e
BS 2871 CN102 CN107 CN108 CZ110 CZ111 CZ126 CZ108 C101 C102 C106 Copper and Copper Alloy Tubes

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