U-tubes

Thanks to our own in-house bending equipment, TPS can manufacture U-tubes ready for installation, for example for the use in heat exchangers, condensers, recuperators and other thermotechnical machines. With straight leg lengths of up to 9 m, our production complies with common standards or with the customer’s specification. If requested, the bent portion of the U-tubes can be heat treated.

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Surface quality

Heat treatment and bending area

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Inspection

Applicable standards

U-tube tolerances

Tolerance on radii Rt	rm 1,5 x da up to rm 200: +/- 1,0 mm rm > 200 up to rm 400: +/- 1,5 mm rm > 400 +/- 2,0 mm
Straight leg length difference a	Straight leg length ≤ 6000 mm: - 0 / + 3 mm Straight leg length > 6000 mm: - 0 / + 5 mm
Straight leg length tolerance l	Straight leg length ≤ 6000 mm: - 0 / + 3 mm Straight leg length > 6000 mm ≤ 9000 mm: - 0 / + 4 mm Straight leg length > 9000 mm: - 0 / + 5 mm
Total length tolerance lg	≤ 6000 mm: - 0 / + 5 mm > 6000 mm: - 0 / + 8 mm
Flattening of the bent area	Acc. TEMA RCB-2.31: max. 10% flattening from the nominal OD
Deviation from the roundness R [%]	rm ≤ 4 x da: $R = \frac{d a}{5xr m} x 100[%]$ rm ≤ 4 x da: ≤ 5 % Calculation of the ovality: $R = \frac{d a \max - d a \min}{d a \max + d a \min} [%]$
Wall thinning of the bent area Smin	Acc. TEMA R-2.31 for radii larger than 1,5da: max 17% wall thinning
Flatness tolerance t	rm ≤ 300 mm: ≤ 1,5 mm rm > 300 mm: ≤ 2,0 mm
Deviant tolerances	With radii <1,5 x da tolerances deviating from the tolerance standard must be defined for the ovality/flattening and minimum wall in the bent area. Bending of titanium/titanium alloy U-tubes is possible for radii 2 x da

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U-tubes

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U-tube tolerances