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

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:

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

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).

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Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories,  the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always.   The factories already got certificates like : ABS, LR, DNV-GL, BV, KR, CCS, ASME, ISO 9001, ISO14001, ISO18001, ect.

Our factories main products as below : 
Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

Factory 2th: Carbon steel seamless tube, Alloy steel seamless tube; Enhanced Heat Tranfer Tube, low fin tube ,U bending workshop;
Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube,  KL type fin tube), Embedded G type fin tube , Extruded fin tube,  low fin tube, U bend & 180deg. Return;

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