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V-1284 — Two-Phase Hydrocarbon Drum V-1284

Sulfur Recovery Unit · Two-Phase Hydrocarbon service · Installed Aug 29, 1996 (30 yrs in service)

High
Current Min. Thickness
0.809 in
t-min 0.888 in
Measured Corrosion Rate
7.92 mpy
ML-predicted: 7.65 mpy
Remaining Life
0.0 yrs
Next Inspection Due
Feb 20, 2027
Interval: 0.5 yrs (API 510)

UT Thickness Trend

Minimum CML reading per inspection vs. ASME Sec. VIII t-min

Vessel Specification

MaterialSA-240-316L Stainless
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure475 psig
Design Temperature246 °F
Operating Pressure372 psig
Operating Temperature179 °F
Diameter52 in
Nominal Thickness1.048 in
Corrosion Allowance0.0938 in
H2S / Chloride49 / 257 ppm
Flow Velocity21.0 ft/s
Process pH6.55
InsulatedNo

Corrosion & Remaining-Life What-If

Adjust operating conditions to see the live model-predicted corrosion rate and implied remaining life

Live Prediction — What-If Model
10.77 mpy
Predicted corrosion rate under these conditions (+2.85 mpy vs. current measured rate)
Implied Remaining Life
0.0 yrs
Implied Reinspection Interval
0.5 yrs

What-if model: standardized Ridge regression, R² 0.56 on held-out fleet data (3.25 mpy MAE). Runs entirely client-side for instant feedback — see Model Insights for the full fleet-scale ensemble model used for official predictions.

Governing Damage Mechanism — Erosion-Corrosion

API 571 §4.2.13

Mechanical removal of protective scale by high-velocity flow or entrained solids, accelerating the underlying corrosion mechanism.

Recommended inspection approach: UT thickness at flow-direction changes (elbows, reducers); review process velocity against API RP 14E erosional velocity limits.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid (API 572)80.8120 in0.8093 in
Dec 10, 2024UT Spot80.8244 in0.8151 in
Jan 10, 2022UT Spot80.8497 in0.8333 in
Aug 9, 2019UT Grid (API 572)80.8676 in0.8478 in
May 30, 2017UT Spot80.8810 in0.8715 in
Jan 30, 2015UT Spot80.9022 in0.8940 in
Jun 27, 2013UT Spot80.9118 in0.9106 in
Dec 16, 2010UT Grid (API 572)80.9371 in0.9279 in
Aug 5, 2008UT Grid + RT80.9516 in0.9330 in
Jul 8, 2006UT Grid (API 572)80.9682 in0.9553 in
Oct 28, 2003UT Grid (API 572)80.9921 in0.9727 in
Nov 26, 2001UT Spot81.0080 in0.9972 in
Oct 19, 1998UT Grid (API 572)81.0338 in1.0265 in