Stainless Steel U pipes|Duplex stainless steel U tubes

U-Tubes
Carbon & Alloy steel U tubes:
Size Range：OD 5/8"~1 1/2" , WT 1.65mm~2.77mm  Min Radio: 29mm ; Max Radio:675.84mm
Type of End-Finish：PE
Stainless steel U tubes:
Size Range：OD 5/8"~1 1/2" , WT 1.65mm~2.77mm  Min Radio: 29mm ; Max Radio:675.84mm
Type of End-Finish：PE

Tchnical conditions:
Heat treatment:Stress relive annealing of U-tubes after bending
Surface condition Finished U-tubes shall be free of scale, without scratches after bending
Dimensional tolerances U-tubes acc. to TEMA R.C.B.
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 RCB 2.31
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
Radius tolerance 1) for R   100 mm +/- 3 mm
2) for R ≥ 100 mm +/- 5 mm
Straightness tolerance max. 1,5 mm per 1 m
U-Tube ends: plain, vertically cut to the tube axis
Repairs by welding: prohibited
Surface condition Finished U-tubes shall be free of scale, without scratches after bending, 

Mandatory tests for U-tubes
100 % Dimensional and visual control.
100 % Ball passed test
100 % Hydrostatic test min 10Mpa/ min 10sec.

Coating :Passivation and oiled, Black paint or varnish
Packing:Plastic plugs in both ends, bundles of max. 3,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper packed in wooden case
Mill Test Certificate:EN 10204/3.1B