CONCEPT DEMONSTRATION
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V-1230 — Caustic Wash Drum V-1230

Delayed Coker · Caustic Wash service · Installed Aug 29, 1996 (30 yrs in service)

Low-Medium
Current Min. Thickness
0.630 in
t-min 0.550 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: -0.48 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. 1
Joint Efficiency0.85
Design Pressure244 psig
Design Temperature408 °F
Operating Pressure147 psig
Operating Temperature320 °F
Diameter76 in
Nominal Thickness0.645 in
Corrosion Allowance0.0625 in
H2S / Chloride30 / 2838 ppm
Flow Velocity15.8 ft/s
Process pH7.94
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 (-0.40 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 — Chloride Stress Corrosion Cracking (Cl-SCC)

API 571 §4.5.2

Cracking of austenitic stainless steel exposed to chlorides above roughly 140°F under tensile stress; not a thickness-loss mechanism.

Recommended inspection approach: Surface/near-surface NDE (PT, ECT) at susceptible welds and CUI-prone insulated stainless piping; chloride source control.

This mechanism is crack-dominant — thickness monitoring alone will not detect it. See Standards & Documentation for the full NDE requirement.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid (API 572)40.6450 in0.6304 in
Mar 5, 2025UT Grid + RT40.6378 in0.6210 in
Dec 17, 2021UT Grid + RT40.6436 in0.6287 in
Oct 31, 2019UT Spot40.6430 in0.6410 in
Apr 4, 2018UT Grid + RT40.6443 in0.6398 in
Jul 11, 2015UT Spot40.6411 in0.6217 in
Feb 1, 2014UT Grid (API 572)40.6417 in0.6316 in
Dec 18, 2011UT Spot40.6408 in0.6404 in
Jul 28, 2009UT Spot40.6394 in0.6284 in
Dec 9, 2007UT Grid + RT40.6454 in0.6380 in
Jun 28, 2006UT Spot40.6429 in0.6238 in
Nov 20, 2004UT Grid (API 572)40.6420 in0.6262 in
Mar 2, 2003UT Grid + RT40.6448 in0.6276 in
Jun 7, 2001UT Grid + RT40.6435 in0.6383 in
Sep 11, 1998UT Grid (API 572)40.6452 in0.6352 in