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U Tubes
U Tubes
1. General specifications:
2. Tube Sizes for heat exchangers and condensers-Imperial sizes BWG:
3. U-bend definitions and description:
a.....difference in length of legs
c.....distance between points of tangency
da....nominal outside diameter of tube
e.....distance between legs measured on OD
f......distance between legs
l......leg length
lg.....developed length
rm....nominal bend radius
S.....nominal wall thickness
Smin..minimum wall thickness at the back of the bend
t......deviation from plane of the bend
S0....minimum wall thickness defined by specification
4. Heat treatment:
If specified, we are equipped to carry out heat treatment of bends plus min. 150 mm of leg.
· Furnace is computer controlled and all data is recorded.
· We use an argon protective atmosphere inside the tubes.
· We can provide all types of annealing: Solution; Stress relieving; Stabilization.
5. Technical parameters:
OD 12.7-38 mm.
Bending radii from 1.5xOD up to 1250 mm. Minimum bending radii for OD′s over 28 mm after agreement.
Leg length min. 1,000 mm.
Leg length max. 12,000 mm.
Heat treatment for radii up to 1,000 mm.
6. Technical standards for bending:
Other specifications or special requirements available upon request. Copies of common standard specifications are available on request.
7. Hydrotesting:
· After heat treatment all U-tubes are hydrotested.
· Minimum holding time at the required pressure is 5 sec.
· All tubes are dried and carefully cleaned after testing.
8. Measuring, cutting, deburring, cleaning:
· U-bends are measured exactly in accordance with relevant standards, or to customer’s specification.
· All tubes are cut to the specified leg lengths, ends are deburred and the tubes are internally cleaned with air.
· Before packing, both ends are capped with plastic caps.
9. Packing:
· In strong, open or closed, wooden boxes depending on destination - max. 8,000 kg.
· Ends of tubes protected by plastic caps.
· Vertical separators for each radius.
· Chloride free plastic separators between each row, every 2 meters.
· Each bundle is covered with plastic.
· Customers can provide a packing drawing.
· Packing lists, covered with plastic, are placed on each wooden box for easy identification of order details – including exact list of radii and lengths inside.
| Standards： | ASTM A 213, ASME SA 213, ASTM A 249, ASME SA 249, ASTM A 688, ASME SA 688, ASTM A 789, ASME SA 789, ASTM B 163, ASME SB 163, ASTM B 167, ASME SB 167, ASTM B 668, ASME SB 668 |
| Materials: | 304/L/H, 316/L/TI, 317/L, 321/H, 347/H, 310S, S31500, S31803,S32205, S32750, S32760, S32001, S32304, N06600, N06625,N08800, N08810, N08811, N08825, N08904, N04400,TI GR.1/GR.2 |
2. Tube Sizes for heat exchangers and condensers-Imperial sizes BWG:
| Outside Diameter | BWG | |||||||
| 22 | 20 | 18 | 16 | 14 | 12 | 10 | ||
| Wall Thickcess mm | ||||||||
| 0.71 | 0.89 | 1.24 | 1.65 | 2.11 | 2.77 | 3.40 | ||
| mm | Inches | Weight Kg/m | ||||||
| 12.70 | 1/2 | 0.214 | 0.263 | 0.356 | 0.457 | - | - | - |
| 15.88 | 5/8 | 0.271 | 0.334 | 0.455 | 0.588 | - | - | - |
| 19.05 | 3/4 | 0.327 | 0.405 | 0.553 | 0.729 | 0.895 | - | - |
| 25.40 | 1 | 0.440 | 0.546 | 0.750 | 0.981 | 1.234 | 1.574 | - |
| 31.75 | 11/4 | 0.554 | 0.688 | 0.947 | 1.244 | 1.574 | 2.014 | - |
| 38.10 | 11/2 | 0.667 | 0.832 | 1.144 | 1.514 | 1.904 | 2.454 | - |
| 44.50 | 13/4 | - | - | 1.342 | 1.774 | 2.244 | 2.894 | 3.50 |
| 50.80 | 2 | - | - | 1.549 | 2.034 | 2.574 | 3.334 | 4.03 |
3. U-bend definitions and description:
a.....difference in length of legs
c.....distance between points of tangency
da....nominal outside diameter of tube
e.....distance between legs measured on OD
f......distance between legs
l......leg length
lg.....developed length
rm....nominal bend radius
S.....nominal wall thickness
Smin..minimum wall thickness at the back of the bend
t......deviation from plane of the bend
S0....minimum wall thickness defined by specification
4. Heat treatment:
If specified, we are equipped to carry out heat treatment of bends plus min. 150 mm of leg.
· Furnace is computer controlled and all data is recorded.
· We use an argon protective atmosphere inside the tubes.
· We can provide all types of annealing: Solution; Stress relieving; Stabilization.
5. Technical parameters:
OD 12.7-38 mm.
Bending radii from 1.5xOD up to 1250 mm. Minimum bending radii for OD′s over 28 mm after agreement.
Leg length min. 1,000 mm.
Leg length max. 12,000 mm.
Heat treatment for radii up to 1,000 mm.
6. Technical standards for bending:
Other specifications or special requirements available upon request. Copies of common standard specifications are available on request.
7. Hydrotesting:
· After heat treatment all U-tubes are hydrotested.
· Minimum holding time at the required pressure is 5 sec.
· All tubes are dried and carefully cleaned after testing.
8. Measuring, cutting, deburring, cleaning:
· U-bends are measured exactly in accordance with relevant standards, or to customer’s specification.
· All tubes are cut to the specified leg lengths, ends are deburred and the tubes are internally cleaned with air.
· Before packing, both ends are capped with plastic caps.
9. Packing:
· In strong, open or closed, wooden boxes depending on destination - max. 8,000 kg.
· Ends of tubes protected by plastic caps.
· Vertical separators for each radius.
· Chloride free plastic separators between each row, every 2 meters.
· Each bundle is covered with plastic.
· Customers can provide a packing drawing.
· Packing lists, covered with plastic, are placed on each wooden box for easy identification of order details – including exact list of radii and lengths inside.
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