Yuhong Group builds API 660 shell-and-tube heat exchangers as a purchasing specification overlay on TEMA Class R and ASME BPVC Section VIII Division 1, intended for petroleum, petrochemical, and natural gas processing where a TEMA-only design is insufficient for hazardous hydrocarbon containment.
The differentiating engineering point is channel selection under pressure differential: when tube-side design pressure exceeds 10.3 MPa (1500 psig), or tube-to-shell differential exceeds 5.2 MPa (750 psig), API 660 mandates a TEMA C-type channel so the high-pressure shell-to-channel seal remains undisturbed during bundle access. This is a procurement-level requirement that stops at API 660—TEMA alone leaves it to designer judgment.
The result is an exchanger configured for hydrocracker, hydrotreater, and high-pressure gas service where downtime cost per day outscales the unit price difference between a B-type and C-type channel.
| Parameter | Standard Range | Project-Specific Trigger |
|---|---|---|
| Design pressure | Up to 100 bar | Above 100 bar → engineering review |
| Design temperature | −29 °C to +350 °C | Outside range → material/fatigue review |
| Heat transfer area | 10–900 m² | Up to 1,500 m² upon review |
| Shell diameter | 150–2000 mm | Consult for larger diameters |
| Tube OD | 12.7 / 19.05 / 25.4 mm | Layout: 30°, 90°, or 45° |
| Corrosion allowance (CS/low-alloy) | Minimum 3.2 mm (1/8 inch) | API 660 mandatory floor |
| Component | Carbon Steel Option | Stainless / Alloy Option | Selection Criterion |
|---|---|---|---|
| Shell | ASTM A516 Gr.70 | 304 / 316 / 321, Duplex | Wet H₂S → NACE MR0175/ISO 15156 |
| Tube | ASTM A179 / A210 | A213/A249 304/316/321; Inconel, Hastelloy | Seamless mandatory for severe service |
| Tubesheet | SA266 Gr.2 | SA182 F11; clad/overlay | Tube-side pressure >10.3 MPa → C-type channel |
In a refinery hydrocracker or hydrotreater, tube-side pressure commonly reaches 10.5 MPa. A TEMA B-type bonnet with gasketed cover passes TEMA review but fails API 660 because the cover gasket sits in the bolting path and is disturbed during inspection—a field re-make risk in high-pressure hydrocarbon service.
Yuhong supplies the C-type removable channel configuration so the gasket stays outside the bolting path and the shell-side seal remains intact during bundle pulling. Nozzles 2 inch and larger are flanged with full-penetration welds and rated for 2 × TEMA allowable moments from connected piping thermal expansion.
Compliance stack: API 660 (10th Ed., 2020 / ISO 16812) overlaid on ASME Section VIII Div. 1 and TEMA Class R; hydrostatic test at 1.3 × MAWP per ASME UG-99, minimum 1 hour hold; NDE by RT, UT, PT, MT; full EN 10204 3.1 traceability.
Tube-side design pressure > 10.3 MPa (1500 psig), or tube-to-shell differential > 5.2 MPa (750 psig), or tubesheet tube-side temperature differential > 110 °C. Confirm these three numbers on the data sheet before assuming a B-type bonnet is acceptable.
For severe or hazardous services under API 660, seamless tubes are mandatory; ERW is prohibited unless explicitly approved for mild service. This directly affects tube mill lead time and should be fixed at the inquiry stage.
MOQ: 1 set; Lead Time: 40–120 working days from approved drawings, with expedited slots for turnaround projects; FOB Shanghai/Ningbo quoted against the confirmed ASME/API data sheet.
Each unit ships with a sea-worthy export package including design report, material certificates (EN 10204 3.1), NDE records, and hydrotest charts. Bundle pulling eyes and skid bars remain accessible for discharge and site handling. Third-party inspection by BV, TUV, or SGS is arranged at the client's nominated scope prior to packing.
Send your process specification (API 660 Appendix D format or company data sheet) with design pressure, design temperature, tube-side/shell-side differential, and corrosion allowance. Yuhong returns a C-type vs. B-type channel assessment, firm MOQ/FOB/Lead Time, and a material compliance matrix within 48 hours of a complete data sheet.
No catalogue ratings are quoted for pressures above 100 bar or temperatures outside −29 °C to +350 °C without project-specific engineering review.
