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V-1301 — Two-Phase Hydrocarbon Drum V-1301

Sulfur Recovery Unit · Two-Phase Hydrocarbon service · Installed Aug 25, 2013 (13 yrs in service)

Low-Medium
Current Min. Thickness
1.060 in
t-min 0.969 in
Measured Corrosion Rate
7.25 mpy
ML-predicted: 7.01 mpy
Remaining Life
12.6 yrs
Next Inspection Due
Dec 5, 2032
Interval: 6.3 yrs (API 510)

UT Thickness Trend

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

Vessel Specification

MaterialSA-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency1.00
Design Pressure447 psig
Design Temperature353 °F
Operating Pressure302 psig
Operating Temperature275 °F
Diameter76 in
Nominal Thickness1.157 in
Corrosion Allowance0.1250 in
H2S / Chloride48 / 238 ppm
Flow Velocity5.6 ft/s
Process pH6.50
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
7.01 mpy
Predicted corrosion rate under these conditions (-0.24 mpy vs. current measured rate)
Implied Remaining Life
13.0 yrs
Implied Reinspection Interval
6.5 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 + RT81.0632 in1.0601 in
Feb 16, 2025UT Grid (API 572)81.0726 in1.0555 in
Jan 20, 2023UT Grid + RT81.0903 in1.0894 in
Dec 29, 2019UT Grid (API 572)81.1112 in1.1090 in
Nov 16, 2017UT Grid + RT81.1273 in1.1074 in
May 4, 2016UT Spot81.1371 in1.1241 in