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Aluminium Brass ASME SB111 C68700 U Bend Heat Exchanger Tube For Refinery Coolers

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Aluminium Brass ASME SB111 C68700 U Bend Heat Exchanger Tube For Refinery Coolers

Brand Name : YUHONG

Model Number : Aluminium Brass Tube ASME SB111 C68700 U Bend Heat Exchanger Tube for Refinery Coolers

Certification : ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008

Place of Origin : China

MOQ : 500KGS

Price : negotiable

Payment Terms : T/T, L/C

Supply Ability : 1500 tons per month

Delivery Time : According to the quantity

Packaging Details : Ply-wooden Case with plastic Cap

Material : Aluminium Brass Tube ASME SB111 C68700 U Bend Heat Exchanger Tube for Refinery Coolers

Standard : ASTM B111, ASME SB111

NDT : Eddy Current Test, Hydrostatic Test, UT, IGC, Grain Size Test , ...

Type : Straight , U bend , Snake Bend, Coil form

Surface : Bright annealed, Polished, Pickled

End Type : Bevled End, Plain End, Thread End

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ASME SB111 C68700 U Bend Boiler Tube Application

1. Marine & Offshore Systems

  • Seawater Cooled Condensers & Heat Exchangers: Shipboard condensers (main engine cooling), Offshore oil rig heat exchangers (cooling hydraulic systems, lube oil), Desalination plants (multi-stage flash evaporators).

2. Power Generation (Fossil & Nuclear)

  • Steam Surface Condensers: Coastal/nuclear power plants (seawater-cooled condensers), Waste heat recovery units (exhaust gas boilers).

3. Chemical & Petrochemical Processing

  • Application: Corrosive Fluid Heat Transfer: Refinery coolers (hydrocarbon processing), Ammonia condensers (fertilizer plants).

4. HVAC & Refrigeration

  • Chillers & Evaporators: Compact design fits shell-and-tube evaporators (e.g., industrial chillers), Seawater-cooled HVAC (tropical coastal buildings), Industrial refrigeration systems.

5. Industrial Process Cooling

  • High-Temperature/Pressure Exchangers: Meets strict dimensional tolerances for high-pressure systems, Brewery/distillery wort coolers, Pulp & paper mill heat recovery.

ASME SB111 C68700 Bend Boiler Tube Strength

1. Mechanical Properties of C68700 Aluminum Brass The SB111 specification ensures the tube meets certain strength criteria.

Typical room-temperature properties for C68700 (ASTM B111, ASME SB111) are:

Property Value
Tensile Strength (UTS) 380 – 520 MPa (55,000 – 75,000 psi)
Yield Strength (0.2% Offset, YS) 140 – 310 MPa (20,000 – 45,000 psi)
Elongation (in 50mm) 35 – 45% (varies with temper)
Hardness (Rockwell B) 50 – 85 HRB
Modulus of Elasticity 100 – 110 GPa (14.5 – 16 Msi)

2. Factors Affecting Strength

A. Temperature Effects

  • At Elevated Temperatures (~150–250°C / 302–482°F):
  • Tensile strength decreases by ~20–30%.
  • Risk of creep deformation if stressed near yield limits.
  • Below 0°C (32°F):
  • Becomes slightly stronger but more brittle (impact resistance drops).

B. Corrosion & Erosion Impact

  • Dezincification or pitting can reduce effective wall thickness, lowering pressure-bearing capacity.
  • Erosion-corrosion (high-velocity seawater) may accelerate wear.

C. U-Bend Stress Considerations

  • The bent region is work-hardened, increasing local strength but risking stress cracking if improperly annealed.
  • Residual stresses from bending may require stress relief annealing.

3. Strength Comparison with Other Heat Exchanger Tubes

Material Tensile Strength (MPa) Yield Strength (MPa) Key Advantage
C68700 (Al Brass) 380–520 140–310 Best for seawater corrosion
C70600 (90/10 Cu-Ni) 290–400 120–200 Better sulfide resistance
C71500 (70/30 Cu-Ni) 350–550 140–350 Higher strength than C70600
Titanium Gr. 2 345–483 275–345 Lightweight, no corrosion
Carbon Steel 400–550 205–250 Cheap but rusts easily

4. Design & Operational Strength Limits

  • Max Allowable Pressure: Depends on tube diameter/wall thickness (use ASME BPVC Section VIII for calculations).
  • Fatigue Life: Excellent for cyclic thermal loads (U-bend accommodates expansion).
  • Avoid: Over-tightening in tube sheets (can collapse thin-walled tubes). Excessive vibration (may cause fretting wear).

5. Testing & Certification

  • Hydrostatic Test: Ensures no leaks at 1.5x design pressure.
  • Eddy Current/UT Testing: Checks for defects affecting strength.
  • Certifications: ASTM B111 / ASME SB111, EN 12451 (EU).

Aluminium Brass ASME SB111 C68700 U Bend Heat Exchanger Tube For Refinery Coolers


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