ASME U‑Tube Shell & Tube Heat Exchanger TEMA BEU Class R for Petrochemical Process Duty
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
Primary Design Code | ASME BPVC Section VIII, Division 1 |
Mechanical / Geometry Standard | TEMA — Class R |
Industry Practice Supplement | API 660 / API 661 |
Welding Qualification | ASME Section IX |
Flange / Nozzle Dimensioning | ASME B16.5 (flanges), ASME B16.47 (large‑diam.), ASME B31.3 (piping interface loads considered in nozzle reinforcement per UG‑37) |
Stamp | ASME "U" Stamp |
Welding & NDT Regime (ASME VIII‑1 / Section IX)
Weld Category | Typical NDT Requirement |
|---|---|
Long. & circ. shell seams (pressure) | RT per UW‑51 (typically 100 % for Class R), or UT where approved |
Nozzle‑to‑shell / insert welds | MT or PT (surface crack detection) per UW‑50 / project spec |
Tube‑to‑tubesheet seal welds | PT or MT 100 % |
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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