V-1060 — Catalyst Slurry Drum V-1060

Delayed Coker · Catalyst Slurry service · Installed Sep 1, 1987 (39 yrs in service)

High

Current Min. Thickness

0.461 in

t-min 0.928 in

Measured Corrosion Rate

16.21 mpy

ML-predicted: 13.59 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-240-304L Stainless

Design CodeASME BPVC Section VIII, Div. 1

Joint Efficiency0.85

Design Pressure387 psig

Design Temperature686 °F

Operating Pressure267 psig

Operating Temperature445 °F

Diameter67 in

Nominal Thickness1.055 in

Corrosion Allowance0.0625 in

H2S / Chloride5 / 35 ppm

Flow Velocity18.2 ft/s

Process pH4.60

InsulatedNo

Corrosion & Remaining-Life What-If

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

Operating Temperature445°F

H2S Concentration5 ppm

Chloride Concentration35 ppm

Flow Velocity18.2 ft/s

Process pH4.6

Insulated (CUI potential)

MaterialDamage Mechanism

Live Prediction — What-If Model

11.23 mpy

Predicted corrosion rate under these conditions (-4.98 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

Date	Method	CML Count	Avg Thickness	Min CML Thickness
Aug 22, 2026	UT Grid + RT	6	0.4643 in	0.4614 in
Aug 6, 2024	UT Grid (API 572)	6	0.4643 in	0.4514 in
Oct 12, 2022	UT Grid (API 572)	6	0.4643 in	0.4469 in
Oct 24, 2020	UT Spot	6	0.4643 in	0.4568 in
Feb 26, 2018	UT Grid (API 572)	6	0.4643 in	0.4495 in
Jan 7, 2015	UT Grid (API 572)	6	0.4643 in	0.4528 in
Oct 24, 2011	UT Spot	6	0.5350 in	0.5246 in
Dec 28, 2009	UT Grid + RT	6	0.5685 in	0.5556 in
Jul 13, 2007	UT Grid + RT	6	0.6255 in	0.6167 in
Feb 3, 2005	UT Spot	6	0.6784 in	0.6609 in
Jun 3, 2002	UT Grid (API 572)	6	0.7365 in	0.7292 in
Feb 23, 2000	UT Grid (API 572)	6	0.7833 in	0.7653 in
Mar 8, 1998	UT Grid (API 572)	6	0.8271 in	0.8078 in
Nov 7, 1995	UT Grid + RT	6	0.8767 in	0.8735 in
Jun 23, 1993	UT Grid + RT	6	0.9296 in	0.9134 in
Jun 28, 1990	UT Grid + RT	6	0.9944 in	0.9930 in