HP-HT Preheater Heat Exchanger ASME Section VIII Div. 1 TEMA Heat Exchanger Finned Tube Bundle

YUHONG HEAT EXCHAGER TUBE BUNDLE is an industrial high-pressure high-temperature (HP-HT) preheater shell and tube heat exchanger manufactured for geothermal power generation installations. The unit incorporates a precision-engineered finned tube bundle inside a heavy-wall pressure vessel shell constructed strictly under ASME Boiler and Pressure Vessel Code Section VIII, Division 1 rules. It serves as a primary thermal transfer unit between steam loops and working fluid cycles in binary geothermal power plant operations.

3.2 Key Components & Material Specifications

3.3 Core Technical & Fabrication Features

• ASME Code Stamped Fabrication: Mechanical design and structural calculations strictly follow ASME Section VIII, Division 1 and standard TEMA heat exchanger mechanical standards.

• Clad Tubesheet Interface: Stationed with a 3.0 mm minimum thickness SA-240 TP316L stainless steel weld overlay across the SA-350 LF2 forging surface exposed to corrosive process media.

• Precision Tube-to-Tubesheet Joints: Tubes are expanded and strength-welded using automated GTAW processes compliant with ASME Section IX welding procedures.

• Heavy-Duty Support Structure: Integrated saddle supports engineered for seismic loading, wind loads, and thermal expansion forces during operational cycles.

3.4 Quality Assurance & Testing Specifications

• Non-Destructive Examination (NDE): 100% Full Radiographic Testing (RT-1) on all longitudinal and circumferential butt welds per ASME Sec. VIII Div. 1.

• Surface Defect Inspection: Liquid Penetrant Testing (PT) on all stainless steel cladding overlays, tube-to-tubesheet strength welds, and nozzle attachment welds.

• Hydrostatic Pressure Test: Factory shell-side and tube-side hydrostatic pressure testing performed at 1.3 times the maximum allowable working pressure (MAWP) held for a minimum duration of 60 minutes.

• Positive Material Identification (PMI): 100% PMI verification on all alloy raw materials, pressure-retaining components, and filler metals prior to assembly.

• Dimensional & Flatness Control: Laser-verified tubesheet flatness and nozzle flange orientation alignments compliant with TEMA Class R tolerances.

3.5 International Logistics & Market Support

• Export Packaging: Sealed internal nitrogen purge (0.5 bar positive pressure) with desiccant charges, protected by heavy-duty steel skid bases and seaworthy vacuum foil wrapping.

• International Compliance Documentation: Delivered with Manufacturer’s Data Report (Form U-1A), Material Test Certificates (EN 10204 Type 3.1), NDE reports, and hydrostatic test charts.

• Regional Regulatory Clearances: Pre-certified for SONCAP (Nigeria Product Certificate), Form M compliance, and Middle East / North Africa (MENA) customs clearance standards.