Dimensional controls on U bend tube
‘U’ bends are produced, controlled and measured fully in accordance with relevant standards.
- Hydrostatic Test
- Air Underwater Test
- Pulsating Pressure Test
- Dye Penetrant Test
- Magnetoscopic test
- Dye penetrant of ‘U’ bend area
- PMI testing
- Heat Treatment
All tubes are cut to the specified leg lenghts, ends deburred and the bores are internally cleaned with dried air.
Heat Treatment
We are equipped to carry out heat treatment of bends plus a minimum 150mm of leg.
Heat Treatment Equipment
- Heat treatment equipment is computer controlled with the added facility of data recording.
- An argon protective atmopshere is used inside stainless and special alloy tubes during heat treatment.
- We can provide all types of annealing; solution annealing and stress relieving.
All tubes are cut to the specified leg lenghts, ends deburred and the bores are internally cleaned with dried air.
Packing
Any type of packing is available according to customer need to worldwide destinations.
- For roadfreight in timber fingers or skids.
- In strong open or closed wooden boxes depending destination.
- Each bundle is protected with plastic sheets.
- Customers can provide their own packing or Salem can prepare a packing plan.
- Detailed packings lists are attached to wooden cases to give quick and clear identification of contents.
Any type of packing is available according to customer need to worldwide destinations.
ASTM A213 ASME SA213 Seamless Alloy Carbon Steel Heat Exchanger U Tubes for Boilers
With strong wood structure box packing by containers loading and shipping.
Usage
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.
"U bend tubes for heat exchangers applied mostly in Oil & Gas plants, Chemical & Petrochemical plants, Refineries, Power plants, Renewable energy plants."
- Object medium: 10% sodium
- hydroxide+5% sodium hypochlorite
- Shell Diameter: ø 800
- Working Pressure: 1.5mpa
- Working Temperature: 40º C-90º C
- Heat Exchange Surface Area: 100M2
- Material: Gr1\Gr2
Materials - U Bend Tube
‘U’ bends are produced, controlled and measured fully in accordance with relevant standards.
| Material |
Grade |
| Carbon Steel |
SA 179 / A 179 |
| Carbon Steel |
SA 210 / A 210 |
| Carbon Steel |
SA 334 / A 334 |
| Stainless Steel |
SA 213 / A 213 |
| Duplex Stainless Steel |
SA 789 / A 789 |
| Copper & Cu Alloys |
SB 111 / B 111 |
| Titanium & Ti Alloys |
SB 338 / B 338 |
ASTM A556M-88/ASME SA556 Seamless cold drawn steel feedwater heater tubes 1
(ASTM A 556 ]M - 88 / ASME 556 /ASTMA556M-88/ASME556)
ASTM A556 is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Feedwater Heater Tubes
Standard:ASME SA556 Chemical Compostion
| Grade | C % | Si % | Mn % | P % | S % |
| B2 | 0.27 max | 0.10 min | 0.29-0.93 | 0.030 max | 0.030 max |
| C2 | 0.30 max | 0.10 min | 0.29-1.06 | 0.030 max | 0.030 max |
Mechanical Properties
| Grade | Tensile Strength MPA | Yield Strength MPA | Hardness HRB |
| B2 | 410 min | 260 min | 79 min |
| C2 | 480 min | 280 min | 89 min |
Each U bend tube of our range is rigorously quality checked by our team of talented professionals on every stage of production to deliver the clients defect free best quality products. These U bend tubes can be custom designed in various diameters as per the requirements of our clients.
U-Bend Fabrication Tolerances
Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields — nuclear and petrochemical machine building.
| Item |
Condition (when) |
Tolercance |
|---|
| | Nominal bend radius ≤ 2 x nominal OD |
less than or equal to 12% |
| Ovality |
2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD |
less than or equal to 10% |
| | Nominal bend radius > 4 x nominal OD |
less than or equal to 5% |
| | Nominal bend radius ≤ 2 x nominal OD |
0.75 x nominal wall |
| Mimimum wall thickness |
2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD |
0.8 x nominal wall |
| | Nominal bend radius > 4 x nominal OD |
0.9 x nominal wall |
| | Nominal bend radius ≤ 8" (200mm) |
+/-3/64"(1mm) |
| Bending Radius |
8" (200mm) < Nominal bend radius ≤ 16" (400mm) |
+/-1/16"(1mm) |
| | Nominal bend radius >16" (400mm) |
+/-5/64"(1mm) |
| Disrance between legs |
| Max 1/16"(1.5mm) |
| Wall thinning of bending area |
| Max 17% |
| Difference between leg lengths at the ends |
Leg length ≤ 16' (4.88m) |
+1/8"(3mm) |
| Leg length > 16' (4.88m) |
+3/16"(5mm) |
| Deviation from plane of bend |
| ≤ 3/16"(1.5mm) |
| Flattening on bend |
| ≤ 10% nominal diameter |
| Straight leg length |
≤5m |
+1/8"(3mm) |
| >5m |
+3/16(5mm) |
| Total tube length including radius |
≤6m |
+3/16(5mm) |
| >6m |
+5/16"(8mm) |
Standards usually required to establish U bend tube tolerances:
- ASTM A556/556M
- ASTM B395 / B395M
- ASTM A688/688M
- ASTM A803/803M
- DIN 28179
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