ASME U Stamped HP Evaporator Shell & Tube Heat Exchanger for Geothermal ORC Duty

ASME U Stamped HP Evaporator Shell & Tube Heat Exchanger for Geothermal ORC Duty

This is a heavy-duty HP (High-Pressure) Evaporator engineered for a 28 MW geothermal Organic Rankine Cycle (ORC) power plant. The unit transfers heat from geothermal brine to the organic working fluid n-Butane C.G. on the shell side, vaporizing it ahead of the turbine. The exchanger is ASME Section VIII Div.1 + TEMA coded and ASME U-Stamp certified, designed for high-pressure, high-temperature geothermal service with full corrosion allowance on both sides.

Core Technical & Design Parameters

Material Specifications

Inspection, Testing & NDE

• Hydrostatic Test: Per Vendor (Shop/Field)
• Radiographic Examination (RT): 100%
• Ultrasonic Test (UT): Per code
• Magnetic Particle Test (MT): Per code & contractual documents
• Penetrant Test (PT): Per code
• Stress Relieving: Per code (Shell & Tube sides)
• PWHT: Yes – per code
• Forming: By Manufacturer
• Expansion Joint: N = 5,000 cycles
• TEMA Type: SHELL SIDE – BARREL ELL HEAD; TUBE SIDE – BARREL FULL HEAD

Key Features

• ASME U-Stamp Certified – designed, fabricated and stamped to ASME Section VIII Div.1 + TEMA standards
• Duplex stainless steel tube bundle (UNS S31803 / 2205) for superior resistance to geothermal brine corrosion
• SS 316L clad channel + weld-overlaid tubesheet – double corrosion protection on the brine side
• 2,585 m² heat transfer area with 2,998 tubes in 45° pitch layout for maximum thermal efficiency
• 1 shell pass / 2 tube passes optimized for ORC evaporator duty
• 5,000-cycle expansion joint rated for cyclic thermal operation
• 100% radiography on pressure boundary welds