Every chemical unit has someone the night crew rings when a number looks odd. Often it is a panel operator with fifteen years on the same DCS screens. Sometimes it is the chemist who wrote half the recipes and still remembers why the catalyst goes in after the temperature hold, never before. Neither has written much down. Both are a phone call away from a recruiter.
Below we take that pattern apart. How does the gap show itself, what is its price, and why does it linger? Then come the steps that spread such knowledge before a resignation makes the point for you.
What lives only in their heads
- What normal looks like. The usual temperature wobble during an addition. The hum a pump makes just before it starts to cavitate.
- Which instruments to doubt. A level transmitter that sticks in cold weather. A pH probe that drifts after every caustic wash.
- Response order. Which of two simultaneous alarms needs a hand first, and which can wait a minute.
- Raw material quirks. One supplier's lot foams harder or needs a longer soak before heating.
- Recipe logic. Why an addition runs slowly, why a hold exists, and what happens to colour or acid value if someone skips it.
- Customer memory. Which buyer rejects on odour, which on haze, which will tolerate a slight shift in viscosity.
Signs that the expert has gone
Early signals are small. Cycle times stretch, because a newer operator waits for the alarm instead of acting on the trend. QC holds increase. Night calls to the plant head multiply. Scatter between batches of one grade widens, and customers often spot it before the plant.
Specialty units can feel it more sharply. A formulator departs, then a customer requests a small tweak to a long-running grade. Nobody recalls which raw material switch caused the previous complaint, so trials begin from scratch and the customer waits.
Rework, risk and the next resignation
The price shows up as rework, extra testing, longer cooks and slower trials. It shows up as risk as well. An operator who has never learnt which reading to distrust may act on a false one, or ignore a true one. And it shows up in people. Remaining seniors get rung on every shift and rest day, and they quietly become the next resignation.
Why the knowledge stays locked
Teaching is missing from every job description on the plant. Seniors are judged on output, not on how many successors they have raised. Recipes get written as bare steps, because the chemist already knows the reasons. Backups exist on an org chart but never receive console hours. A few holders guard what they know, since being the only one feels like job security.
Rarely is any of this ill will. It is what happens when a plant grows faster than its training habits.
Mapping the single points first
List the decisions on your plant that rest on one or two people. Start with the control room, the QC bench and the formulation lab. Beside each, write who holds it, who backs them up, and when that backup last did it unaided. A skill matrix built for chemical units gives a handy layout.
Spreading it, step by step
- 1
Hold think-aloud hours at the console
A trainer or HR person sits beside the senior for an hour on an ordinary shift and notes what they glance at and why. Repeat across shifts and grades.
- 2
Turn notes into reading cards
One card per unit: normal band, early warning signs, instruments to doubt, first three actions. Keep it clipped at the panel, not filed away.
- 3
Write a reason beside each critical recipe step
One line on why, and what goes wrong if skipped. The documentation routine for specialty makers keeps these current as recipes change.
- 4
Give the backup real console hours
Rostered shifts beside the senior, then supervised solo shifts, then a signed sign-off. A name on paper is not a backup.
- 5
Rehearse upsets
During a shutdown or a quiet hour, walk the backup through two or three likely upsets and ask for their first move.
- 6
Make teaching part of the senior grade
Name it in the job description, credit it in reviews and, where your pay structure allows, in grade progression.
- 7
Talk retention with each key holder
Ask which changes would hold them through the next few campaigns. The retention approach for specialty units sets out how to have that conversation.
Who carries which part
The plant head owns the list of critical decisions. The training lead or HR owns the sessions, cards and sign-off records. Seniors own the teaching, and deserve visible credit for it. Our training routine for industrial plants and the overview of HR for chemical and specialty units show how this slots into a wider plan.
Begin with the hardest loss
Pick the person whose departure would hurt most and begin with them this month. A few hours of their time, written up carefully, is cheap insurance for a chemical plant. Should you want help with the cards, the backup plan and the sign-off records, describe the unit to us.
