Know normal
Understand expected values, noise, rates of change and equipment sound so weak signals stand out.
The operating mindset
A plant is a connected inventory of energy
An operator does not watch isolated numbers. A pressure change affects flow; flow changes exchanger duty; duty changes refrigerant conditions; those conditions affect LNG temperature, compressor load and fuel demand. The job is to recognise the chain early enough to keep it controlled.
Think in trends
A stable-looking value can hide a developing upset. Direction and speed often matter more than one snapshot.
Verify the field
Control-system information is one view. Local indication, vibration, frost, smell and sound provide another.
Control change
Know what work is active, what is bypassed, what is inhibited and what has changed since the last shift.
Interactive process map
Operator console
Select a process area to see what the operator watches, controls and verifies.
PROCESS AREAInlet and feed conditioning
Receives feed gas, separates free liquids and establishes stable pressure and flow into treatment.
WatchFeed pressureRate of change and upstream stability
ControlPlant feed rateMatch production target to available capacity
VerifySeparator levelConfirm drains and liquid routing in the field
Operator question
If feed pressure falls, is the cause upstream supply, a valve position, increased demand or a developing restriction?
From arrival to handover
The anatomy of a shift
Good shifts have a deliberate rhythm. The details vary by site, but the information flow stays recognisable.
Receive handover
Confirm plant status, production target, equipment out of service, active permits, alarm inhibits, overrides, temporary repairs, product constraints and expected work.
- What changed during the previous shift?
- What is not in its normal configuration?
- What could challenge the shift plan?
- Which actions have a time commitment?
Build the mental model
Review key trends, alarm history, controller modes, equipment availability, weather exposure and maintenance boundaries before making non-urgent changes.
Compare current values with the previous shift, previous day and the same operating mode. Look for slow drift, cycling valves and controllers working harder than normal.
Operate and monitor
Balance production against constraints, coordinate field rounds, support permits, sample product, manage alarms and record decisions.
Observe → orient → communicate → act → verify. After every intervention, confirm that the plant responded as expected and no secondary limit moved closer.
Reassess risk
Update the shift picture as maintenance progresses, ambient conditions change, inventories move and equipment performance develops.
Challenge assumptions. A condition accepted at handover may no longer be safe or practical several hours later.
Prepare the next crew
Stabilise where possible, close communication loops, update logs and make abnormal configurations unmistakable.
The incoming operator should understand current state, recent history, future intent and credible threats without needing to reconstruct the shift.
Reading the DCS
What operators actually control
Each variable tells a different part of the process story. Select a variable to unpack it.
What it reveals
Pressure shows the balance between what enters, what leaves and the resistance between them.
What can mislead
A stable pressure may depend on a valve moving continuously or a compressor approaching its limit.
Operator response
Check the trend, controller output, connected equipment and the cause before treating the pressure value itself.
Field operations
Rotating equipment
Cryogenic equipment
Static equipment
Work sites
The plant beyond the screen
Field operators turn the digital plant picture into physical evidence. A high-quality round is targeted observation, not simply walking a route.
Listen for a changed tone. Compare vibration, bearing condition, seal systems, lube oil and local readings with the normal pattern.
Look for unexpected frost boundaries, ice growth, vapour clouds, insulation damage and contraction-related movement.
Check levels, drains, vents, supports, flanges, corrosion condition, insulation and evidence of leakage.
Verify the permit boundary, isolation condition, housekeeping, access, temporary equipment and status of the job.
Interactive checklist
Build your field round
Select each item as it is covered. Progress is saved on this device.
0 of 7 checks complete
Decision training
Alarm response laboratory
Choose an event, then reveal a disciplined response sequence. This is a reasoning framework—not a substitute for site procedures.
Incoming condition
Compressor vibration is rising
The vibration trend moves above its usual operating band while machine load remains steady.
- Acknowledge and identify. Confirm the machine, measurement point, priority and first-out information.
- Validate. Compare redundant indications, bearing temperatures, lube oil conditions, process load and field observations.
- Protect margin. Follow the approved response and communicate early; avoid changes that could move the machine closer to a trip limit.
- Verify and document. Confirm the response, monitor connected systems and capture the event for handover.
Normal operation is only one state
Startup
Startup creates changing inventories, thermal movement and temporary flow paths. Operators work from approved procedures, verify prerequisites, establish utilities, introduce process material in controlled stages and pause at defined hold points.
- Confirm systems are mechanically complete and correctly lined up.
- Verify protective functions, communications and staffing.
- Warm, dry, purge or cool equipment only by the approved method.
- Track which limits are changing as equipment moves toward steady state.
Steady production
The goal is not maximum output at any cost. It is stable, efficient production with adequate margin to equipment, quality and environmental limits.
- Watch controller output as well as process value.
- Distinguish normal ambient effects from equipment degradation.
- Keep treatment performance ahead of cryogenic risk.
- Coordinate rate changes across the whole process chain.
Rate change
A plant-wide rate change is a sequence, not one setpoint move. Feed, treatment, refrigeration, fractionation, storage and utilities must remain balanced while conditions settle.
Planned shutdown
A controlled shutdown removes feed and energy in a planned order, preserves equipment, manages inventories and leaves systems in a clearly defined state for maintenance or standby.
Trip and emergency response
Automatic protection acts to place equipment or process sections in a safer state. Operators prioritise people, understand what tripped first, stabilise connected systems and avoid premature restart.
Communication discipline
A handover that survives a busy shift
Use the builder to reveal the minimum information categories a useful handover must cover.
Select a category to build the handover.
What an operator learns over time
Foundation
Process purpose, site layout, hazards, communications, procedures and basic field observations.
Area knowledge
Equipment, flow paths, controls, trips, utilities, sampling, operating windows and routine tasks.
Console operation
Trend interpretation, controller behaviour, alarm response, coordination and plant-wide consequences.
Abnormal situations
Diagnosis under pressure, prioritisation, communication and stabilisation using approved response plans.
Operational leadership
Risk ownership, coaching, high-quality handovers, learning reviews and conservative decision-making.
Training boundary: This module explains operator thinking and plant relationships. It does not provide operating limits, isolation methods, emergency instructions or startup steps for any specific facility. Use approved site documentation and direction from authorised site personnel.