Place of Origin:
China
Brand Name:
YUHONG
Certification:
ASME U STAMP
Model Number:
Amine Reflux Vessel
Pressure Vessels for Amine Reflux Vessels: Design & Considerations
Amine reflux vessels are pressure vessels designed to handle condensed liquids (water + amine) and residual acid gases (H₂S, CO₂) from the overhead of an amine stripper column. Their design follows strict standards due to corrosive conditions and operational demands.
1. Design Codes & Standards
I.> ASME BPVC (Boiler & Pressure Vessel Code), Section VIII, Div. 1 or 2 – Mandatory for pressure containment.
II.> API 12GDU (Gas Dehydration Units) – Guidelines for amine system components.
III.> NACE MR0175/ISO 15156 – Material selection for H₂S service (sour environments).
IV.> GPSA Engineering Data Book – Industry best practices for gas processing.
| Parameter | Typical Range | Notes |
| Design Pressure | 50–150 psig (3.5–10 barg) | Must exceed stripper overhead pressure. |
| Design Temperature | 200–250°F (93–121°C) | Matches stripper condenser outlet. |
| Material | Carbon steel (SS for high corrosion) | Lined or coated if severe H₂S/CO₂. |
| Corrosion Allowance | 1/8" to 1/4" (3–6 mm) | Extra thickness for amine service. |
| Vent Size | 2–6 inches (DN50–DN150) | For non-condensable gas release. |
3. Material Selection
I.> Carbon Steel (SA-516 Gr. 70) – Most common, cost-effective, but requires amine-compatible coatings/inhibitors.
II.> Stainless Steel (SS 304/316) – Used for high H₂S/CO₂ or oxygen-contaminated systems.
III.> Clad Materials (CS + SS overlay) – For severe corrosion zones.
IV.> Internal Linings (Fiberglass, PTFE, Epoxy) – Additional protection against wet acid gas attack.
Note: Amine degradation products (e.g., heat-stable salts) can accelerate corrosion—material choice depends on amine type (MDEA, DEA, MEA).
4. Nozzle & Internals Requirements
| Nozzle | Purpose | Typical Size |
| Inlet | From condenser | 6–12 inches (DN150–DN300) |
| Liquid Outlet | Reflux to stripper | 3–6 inches (DN80–150) |
| Vent | Non-condensable purge | 2–4 inches (DN50–100) |
| Drain | Sludge removal | 2 inches (DN50) |
PSV (Pressure Safety Valve) – Sized per API 520/521 for overpressure scenarios.
Rupture Disk (Optional) – For additional protection against sudden pressure spikes.
Flare/Scrubber Vent – Disposes H₂S/CO₂ safely.
| Issue | Cause | Solution |
| Corrosion | Wet H₂S, heat-stable salts | Use corrosion-resistant materials, monitor amine quality. |
| Foaming | Contaminated amine | Install mist eliminator, add antifoam agents. |
| Level Control Failure | Faulty instrumentation | Redundant level switches (LT, LAL, LAH). |
| Plugging | Degradation products | Regular flushing, filtration. |
NDT (UT, RT, PT) – Checks for wall thinning/cracks.
Thickness Monitoring – Ultrasonic testing (UT) for corrosion tracking.
Biannual Shutdown Checks – Demister integrity, nozzle condition.
Support and Services:
Our company offers comprehensive technical support and services for our Pressure Vessel product. Our team of experts is available to assist you with installation, maintenance, troubleshooting, and any other technical inquiries you may have. We are committed to ensuring that your Pressure Vessel operates efficiently and safely at all times
Send your inquiry directly to us
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