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V-1298 — Catalyst Slurry Drum V-1298

Sulfur Recovery Unit · Catalyst Slurry service · Installed Aug 30, 1994 (32 yrs in service)

Low-Medium
Current Min. Thickness
0.205 in
t-min 0.159 in
Measured Corrosion Rate
0.71 mpy
ML-predicted: 1.13 mpy
Remaining Life
60+ yrs
Next Inspection Due
Aug 19, 2036
Interval: 10.0 yrs (API 510)

UT Thickness Trend

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

Vessel Specification

MaterialSA-516-70 Carbon Steel
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure83 psig
Design Temperature417 °F
Operating Pressure68 psig
Operating Temperature267 °F
Diameter65 in
Nominal Thickness0.247 in
Corrosion Allowance0.0625 in
H2S / Chloride8 / 43 ppm
Flow Velocity6.5 ft/s
Process pH6.31
InsulatedYes

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
0.10 mpy
Predicted corrosion rate under these conditions (-0.61 mpy vs. current measured rate)
Implied Remaining Life
60+ yrs
Implied Reinspection Interval
10.0 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)40.2236 in0.2054 in
Aug 6, 2025UT Spot40.2249 in0.2090 in
Jan 16, 2023UT Grid (API 572)40.2240 in0.2075 in
Mar 7, 2021UT Grid + RT40.2267 in0.2083 in
Sep 3, 2019UT Grid (API 572)40.2326 in0.2295 in
Feb 19, 2018UT Spot40.2310 in0.2202 in
May 22, 2015UT Grid + RT40.2325 in0.2275 in
Feb 6, 2013UT Spot40.2367 in0.2245 in
May 13, 2010UT Grid + RT40.2367 in0.2248 in
Sep 8, 2008UT Spot40.2373 in0.2345 in
Jun 27, 2005UT Spot40.2376 in0.2238 in
Feb 10, 2004UT Grid + RT40.2384 in0.2338 in
Sep 25, 2001UT Spot40.2425 in0.2304 in
Jan 9, 1999UT Spot40.2438 in0.2293 in
Mar 14, 1996UT Grid + RT40.2457 in0.2447 in