Select practical operating, materials, and process controls to reduce crude corrosivity while preserving safe and reliable refinery operation.
Module Overview
Corrosion in Refinery
Crude Corrosivity
Module 2
Mitigation strategies
Build practical confidence through short lessons, guided decisions, and field-ready checks.
Duration10-15 minutes
FormatVideo and interactive module
AssessmentKnowledge check
Updated30/09/2026
Module progress0%
Complete the module quiz to record progress.
Module video
Operational Scenario
Reduce exposure without losing the operating target
A crude blend increases the potential for high-temperature corrosion. Operations must decide whether to adjust the blend, temperature, velocity, metallurgy, or monitoring plan while maintaining throughput and safe operating limits.
Topics and Subtopics
Select a topic to explore its main ideas, practical considerations, and subtopics.
Mitigation strategy
Operating and process controls
Mitigation starts by controlling the exposure: crude selection and blending, temperature, velocity, water and salt behavior, and other process variables.
Key point: Use approved operating limits and confirm that a change reduces the relevant exposure rather than moving the risk elsewhere.
Control opportunities
Blend management can reduce the severity or duration of an adverse exposure.
Operating adjustments can be faster to implement than a materials change.
Decision cautions
A change in temperature or flow can affect separation, product quality, throughput, or another damage mechanism.
Operating changes require process safety review and clear limits.
Choose a method
Subtopics
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Chemistry | ExposureBlend and feed managementView details
Method briefing
Blend and feed management
Use crude selection, blend proportions, assay review, and feed sequencing to manage the chemistry entering susceptible circuits. Treat blend control as a risk-reduction measure that must be verified against actual operating and inspection evidence.
Track the blend at the time and location represented by the monitoring or inspection result. Pay attention to changes in sulfur, acidity, water, salts, and other properties that influence exposure.
Operating envelopeTemperature and flow controlView details
Method briefing
Temperature and flow control
Keep bulk and metal temperature, velocity, residence time, and phase behavior within the approved operating envelope. A mitigation is effective only when the controlling variable is measured or reliably inferred at the susceptible location.
Focus on furnace outlets, transfer lines, pump-arounds, fractionator sections, and locations where changes in flow or phase can change local damage.
Engineering controls
Materials, inspection, and monitoring controls
When operating controls cannot provide enough margin, combine materials selection, inspection coverage, monitoring, and maintenance planning.
Key point: Mitigation is a system of controls; no single material or instrument removes the need to verify performance.
Control layers
Materials upgrades can provide durable resistance in a defined service.
Monitoring and inspection provide feedback on whether the selected controls are working.
Implementation considerations
Materials changes require compatibility, fabrication, cost, and lifecycle review.
Monitoring signals are local and need representative placement and quality checks.
Choose a method
Subtopics
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Materials | AssuranceMaterials selection and inspection responseView details
Method briefing
Materials selection and inspection response
Select materials and inspection responses for the actual mechanism, temperature, chemistry, and consequence. Use inspection findings to confirm whether the mitigation is maintaining wall thickness and controlling the expected damage distribution.
Prioritize components with high consequence, known susceptibility, unfavorable metallurgy, or evidence of accelerated wall loss.
Interactive Challenge
Interactive diagnostic case study
Choose a layered mitigation response
Decision point
A new blend increases the corrosion indicator while throughput must be maintained. Choose the first mitigation step and the evidence needed to confirm that it is working.
Illustrative exposure and wall-loss trend
Diagnostic clues
Use the approved envelope
Check which operating or blend change is allowed by the process safety and equipment limits before selecting it as a mitigation.
Plan the feedback
Define the monitoring or inspection result that will demonstrate whether the control reduced exposure at the susceptible location.
Reveal the explanation
Mitigation needs feedback
A practical response uses the least disruptive approved control first, then verifies the result with representative monitoring and inspection evidence. If the exposure remains high, escalate to additional operating, materials, or maintenance controls.
Recommended action: Document the selected control, owner, trigger, verification method, and escalation path in the operating and inspection plan.
Field Checklist
Crude corrosivity mitigation review
Use this checklist before changing a blend, operating target, material, monitoring plan, or inspection interval.
0 of 5 completed
Knowledge Check
Mitigation strategies knowledge check
Select the best answer for each question, then submit it to see the reasoning. Pass mark: 70%.
Not yet passed.
Score: 0 / 2
Next Steps
Continue the course
High-temperature sulfidation
Continue to Module 3 to examine sulfur chemistry, operating drivers, metallurgy, and inspection focus.