U-bend tubes

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.

• OD 9.5mm – 38.1mm
• WT up to 6.35mm
• Bending radii 1.25 x OD up to 1700mm
• Bends can be supplied in accordance with TEMA R / ASTM SA/A556
• Leg length up to 15000mm
• Heat treatment where required by electric furnance or direct resistance
• Hydrotesting up to 10,000 psi

Tubes for heat exchangers are made of steel according to:

• EN 10216-2: P235GH
• DIN 1629: St 37.0
• DIN 17175: St35.8, 15Mo3
• A / SA179, steel grades acc to standard
• A / SA 213: T2, T11,T12, T21, T22
• A / SA 556: A2, B2, C2

Measuring, Cutting, Deburring and Cleaning

We bring forth an exclusive range of U-bend tubes, which are known for their superior quality and excellent functionality.

• 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.

After U bend (cold forming), heat treatment of bending portion may be required. Temperature is controlled through the entire heat treated area by fixed and portable infrared pyrometers.

Standard for U bend Tubes

The semi-finished product for U bend tubes are heat exchanger tubes, manufactured and supplied according to DIN 28180 and ASTM A179.

U bend dimension capablity

Tube OD	Tube thickness	Bending Radius	U tube straight “leg” length	Straight tube before U bending
Min. 12,7mm / Max. 31,75mm	Min. 0,70mm / Max. 4,19mm	Min. 1,5 x OD / Max. 1250mm	Max. 12500mm	Max. 27000mm

At present Sunny Steel has purchased the equipment for production of the following product range:

Carbon & Alloy

• ASTM A179 
• ASTM A213 T11
• ASTM A213 T12
  
• ASTM A213 T22 
• ASTM A213 T2 

Ferrite

• TP 410

Austenite

• 304/304L
• 316/316L
• 310S
• 317L
• 321/321H

Duplex

• Duplex 2205
• UNS S31803

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