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{"title":"ASTM A790 UNS S31803 SAF2205 U Bend Tube Bundle ASME Section VIII Certified","imgUrl":"https:\/\/img.chinax.com\/nimg\/99\/3a\/fe41edcfac3f181f139020e8782e-200x200-1\/astm_a790_uns_s31803_saf2205_u_bend_tube_bundle_asme_section_viii_certified.jpg","attrs":{"Components of a Tube Bundle":"Tubes, Tube Sheets, Flange, Baffles, Spacers or Support Plates, Tie rods and Specers, End Caps or Channels","Material For Tube":"UNS S31803","Origin":"China","Application":"Heater, Air Cooler, Heat Exchanger, Condenser"}}
{"title":"ASME U Stamp Shell and Tube Heat Exchanger Bundle SA334 Gr.6 LTCS U-Tube","imgUrl":"https:\/\/img.chinax.com\/nimg\/2c\/73\/fa019e88204f96285efcd26fe967-200x200-1\/asme_u_stamp_shell_and_tube_heat_exchanger_bundle_sa334_gr_6_ltcs_u_tube.jpg","attrs":{"TEMA Type":"CFU","Application":"Ammonia Exchangers","Material":"ASME SA334 GRADE 6","Wall Thickness":"2.11MM"}}
{"title":"Air Cooler Finned Tube Bundle ASME SB163 Monel 400 Seamless Tube With Aluminum","imgUrl":"https:\/\/img.chinax.com\/nimg\/fb\/de\/f48ef162a1bbe7b1fa5c6b2a6dd3-200x200-1\/air_cooler_finned_tube_bundle_asme_sb163_monel_400_seamless_tube_with_aluminum_extruded_type_fin.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"Air Cooler Tube Bundle","Certification":"ASME , U STAMP , PED, API , ABS, LR, DNV, GL , BV, KR, TS, CCS","Place of Origin":"China"}}
{"title":"Stainless Steel Tube Bundle For Heat Exchanger ASME SA213 \/ SA312 \/ SA249 \/","imgUrl":"https:\/\/img.chinax.com\/nimg\/2f\/60\/18c144b173b88a39b37d77e747d1-200x200-1\/stainless_steel_tube_bundle_for_heat_exchanger_asme_sa213_2f_sa312_2f_sa249_2f_sa269.jpg","attrs":{"STANDARD":"ASME SA213 \/ SA312 \/ SA249 \/ SA269","Origin":"China","Application":"Heater, Air Cooler, Heat Exchanger, Condenser","Components of a Tube Bundle":"Tubes, Tube Sheets, Flange, Baffles, Spacers or Support Plates, Tie rods and Specers, End Caps or Channels"}}
{"title":"TEMA AEW Stripper Reboiler Tube Bundle S32205 Duplex Steel U Tube Heat Exchanger","imgUrl":"https:\/\/img.chinax.com\/nimg\/8f\/11\/a7866bfc3c2c54e343a41ac4fd19-200x200-1\/tema_aew_stripper_reboiler_tube_bundle_s32205_duplex_steel_u_tube_heat_exchanger.jpg","attrs":{"TUBE SIDE OPERATING PRESSURE":"3.2 KG\/M\u00b2","HEAT TRANSFER":"135M\u00b2","CONNECT":"EXPENDED AND SEALING WELDING","TUBE SIZE":"19.05X2.11X6096MM"}}
{"title":"ASME U Stamp Shell and Tube Heat Exchanger Bundle SA789 S32205 Duplex 2205","imgUrl":"https:\/\/img.chinax.com\/nimg\/c2\/bb\/f681502979ca334dc0c47fc6fcc1-200x200-1\/asme_u_stamp_shell_and_tube_heat_exchanger_bundle_sa789_s32205_duplex_2205.jpg","attrs":{"Tubes":"SA789 S32205","Spacers":"SA789 S32205","Baffle seals":"SA240 S32205","Baffles":"SA240M S32205"}}
{"title":"Shell and Tube Heat Exchanger Bundle ASTM B111 C71500 70\/30 CuNi Tubes (NACE","imgUrl":"https:\/\/img.chinax.com\/nimg\/d3\/b6\/3dd022cdabfbeebf58074178f998-200x200-1\/shell_and_tube_heat_exchanger_bundle_astm_b111_c71500_70_2f30_cuni_tubes_28nace_mr0175_29.jpg","attrs":{"Material Standards":"ASTM B111 \/ ASTM B543","Tube Length":"1.5 m to 12 m","Material":"C71500 Copper Nickel Alloy (70\/30 Cu-Ni)","Wall Thickness":"BWG 16 to BWG 12"}}
ASTM A790 UNS S31803 SAF2205 U Bend Tube Bundle ASME Section VIII Certified
U-bend tube bundles made of ASTM A790 UNS S31803 (SAF 2205) material, with their high strength, excellent resistance to chloride corrosion, and stress cracking, are particularly suitable for demanding applications such as seawater cooling and chemical heat exchange.
After forming, they must be solution treated to eliminate residual stresses, and then fully pickled and passivated to ensure corrosion resistance. Furthermore, the tube bundle design must be compatible with the S31803 tubesheet, hydraulically expanded, with limited baffle spacing and U-shaped notches to relieve thermal stress.
Chemical Composition
Grade
C
Mn
Si
P
S
Cr
Mo
Ni
N
2205 (UNS S31803)
Min Max
- 0.030
- 2.00
- 1.00
- 0.030
- 0.020
21.0 - 23.0
2.5 - 3.5
4.5 - 6.5
0.08 - 0.20
2205 (UNS S32205)
Min Max
- 0.030
- 2.00
- 1.00
- 0.030
- 0.020
22.0 - 23.0
3.0 - 3.5
4.5 - 6.5
0.14 - 0.20
Mechanical Composition
Grade
Tensile Strength (MPa) min
Yield Strength 0.2% Proof (MPa) min
Elongation (% in 50mm) min
Hardness
Rockwell C (HR C)
Brinell (HB)
UNS S31803 / 2205
621
448
25
31 max
293 max
Physical Properties
Grade
Density (kg/m3)
Elastic Modulus(GPa)
Mean Co-eff of Thermal Expansion (μm/m/°C)
Thermal Conductivity (W/m.K)
Specific Heat 0-100°C( J/kg.K)
Electrical Resistivity (nΩ.m)
0-100°C
0-315°C
0-538°C
at 100°C
at 500°C
UNS S31803 / 2205
782
190
13.7
14.2
-
19
-
418
850
Grade Specification Comparison
Grade
UNS No
Old British
Euronorm
SwedishSS
JapaneseJIS
BS
En
No
Name
2205
S31803 / S32205
318S13
-
1.4462
X2CrNiMoN22-5-3
2377
SUS 329J3L
Components of a Tube Bundle:
Tubes:
The primary heat transfer surface.
Made from materials with high thermal conductivity, such as copper, stainless steel, titanium, or carbon steel, depending on the application.
Tubes can be straight or U-shaped, depending on the design.
Tube Sheets:
Flat plates that hold the tubes in place.
Tubes are either welded, expanded, or rolled into the tube sheets to create a leak-proof seal.
Tube sheets separate the shell-side and tube-side fluids.
Baffles:
Plates or rods that direct the flow of the shell-side fluid across the tube bundle.
Improve heat transfer efficiency by creating turbulence and preventing stagnant zones.
Common types include segmental, helical, and rod baffles.
Spacers or Support Plates:
Used to maintain the alignment and spacing of the tubes.
Prevent vibration and damage to the tubes during operation.
Tie Rods and Spacers:
Hold the baffles and tube bundle together.
Ensure structural integrity.
End Caps or Channels:
Located at the ends of the tube bundle.
Direct the tube-side fluid into and out of the tubes.
Design Considerations for Tube Bundles:
Tube Diameter and Thickness:
Smaller diameters increase heat transfer efficiency but may lead to higher pressure drops.
Thicker tubes are used for high-pressure applications.
Tube Layout:
Tubes can be arranged in triangular, square, or rotated square patterns.
Triangular layouts provide higher heat transfer efficiency, while square layouts are easier to clean.
Tube Length and Number:
Longer tubes increase the heat transfer area but may require more space.
The number of tubes depends on the required heat transfer rate and flow rates.
Material Selection:
Materials must be compatible with the fluids being processed to avoid corrosion or fouling.
Common materials include stainless steel, copper alloys, titanium, and nickel alloys.
Baffle Design:
Baffle spacing and type affect heat transfer efficiency and pressure drop.
Segmental baffles are the most common, but helical baffles can reduce pressure drop and vibration.
Thermal Expansion:
Differential thermal expansion between the tubes and the shell must be accounted for to avoid stress and failure.
U-tube or floating head designs are used to accommodate expansion.
Types of Tube Bundles:
Fixed Tube Sheet Bundle:
Tubes are fixed to the tube sheets at both ends.
Simple and cost-effective but cannot handle large temperature differences between the shell and tube sides.
U-Tube Bundle:
Tubes are bent into a U-shape, allowing for thermal expansion.
Suitable for applications with high temperature differences.
Floating Head Bundle:
One end of the tube bundle is free to move, accommodating thermal expansion.
Ideal for high-temperature and high-pressure applications.
Pull-Through Floating Head Bundle:
Similar to a floating head design but allows the entire tube bundle to be removed for maintenance.
Applications of Tube Bundles:
Power Plants: Condensing steam from turbines.
Oil and Gas: Heating or cooling hydrocarbons in refineries.
Chemical Processing: Heat exchange in reactors and distillation columns.
HVAC Systems: Chillers and condensers.
Food and Beverage: Pasteurization and sterilization processes.
Advantages of Tube Bundles:
High heat transfer efficiency.
Can handle high pressures and temperatures.
Durable and long-lasting with proper maintenance.
Suitable for a wide range of fluids and applications.
Disadvantages of Tube Bundles:
Large physical size and weight.
Higher initial cost compared to some other heat exchanger types.
Requires regular maintenance to prevent fouling and corrosion.
Maintenance and Troubleshooting:
Fouling:
Deposits on the tube surfaces reduce heat transfer efficiency.
Regular cleaning (mechanical or chemical) is required.
Corrosion:
Material selection and protective coatings can help prevent corrosion.
Inspect for pitting or cracking regularly.
Vibration:
Improper baffle spacing or flow rates can cause tube vibration and failure.
