ASME U‑Tube Shell & Tube Heat Exchanger TEMA BEU Class R for Petrochemical Process Duty

YUHONG produce the heavy‑duty U‑tube bundle shell‑and‑tube heat exchangers​ engineered expressly for continuous, high‑severity process service in refinery and petrochemical environments. Every pressure‑boundary component — shell, channel, tubesheets, nozzles, and reinforcing pads — is mechanically designed, fabricated, inspected, and stamped in full compliance with the ASME Boiler & Pressure Vessel Code, Section VIII, Division 1 (ASME VIII‑1), integrated with TEMA Class R​ mechanical standards and API 660​ where refinery‑specific requirements apply.

Design Code & Governing Standards

Welding & NDT Regime (ASME VIII‑1 / Section IX)

Core Pressure‑Boundary Construction

• Formed from normalized carbon steel plate (typically SA‑516 Gr. 60/70) or alloy/clad construction where process chemistry dictates.
• Longitudinal and circumferential seams are full‑penetration, radio graphed per project NDT matrix (ASME VIII‑1, UW‑51).
• Minimum thickness established per UG‑27 / UG‑16(b)​ plus stated corrosion allowance​, plus forming thinning tolerance.
• Bolted channel cover or integral A​ head depending on service access requirements — both designed per UG‑34 (flat heads) and UG‑32 (formed heads).
• Gasket contact surfaces machined to finish compatible with spiral‑wound​ or ring‑joint​ gaskets, selected per ASME pressure‑temperature rating.
• U‑tube tubesheet​ designed per ASME VIII‑1 + TEMA ligament‑efficiency method.
• Unperforated rim (facing) and tube‑hole tolerance controlled to TEMA Class R limits.
• Where galvanic or corrosion severity requires: clad overlayapplied per a Section IX‑qualified WPS, with dilution and interpass temperature controlled; overlay thickness verified by UT/PT.
• Tubes bent to minimum bend radius ≥ 1.5 × tube OD​ .
• Tube‑to‑tubesheet joint: roller‑expanded + seal weld​, with the weld procedure qualified under ASME Section IX.
• Baffles / support plates: segmental or disk‑and‑dough nut per thermal design; baffle spacing never < 20% of shell ID​ or 50 mm​ (TEMA); baffle hole clearance controlled to limit tube vibration and erosion.

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