October 26, 2026
Posted by: editor
Category: RECD & Emission Control Devices

The installer’s team packs up on Friday afternoon. The punch list is closed, the certificate copy is in a folder, and everyone signed an attendance sheet after a two-hour classroom session. On Monday at 11:40 pm the grid trips, the DG set starts, and a warning lamp on the RECD panel comes on that nobody on the night shift has seen before. One operator wants to shut the set down. The other wants to “just run it and tell someone in the morning”.

That gap between a training session and a capable night shift is what RECD operator training must close before you sign the handover. This guide treats handover as an assessment, not a ceremony. It gives you a competency matrix, the skill areas each operator must demonstrate, a practical sign-off test you can run in 60 to 90 minutes, and a method to check whether every shift is actually covered.

If you are still at the ordering stage, the separate question of how to write training requirements into your RECD purchase order is covered elsewhere. Here we assume the training has happened and you now need to verify it.

Attended, Understood, Able: Why Attendance Sheets Prove Very Little

An attendance sheet proves that someone was in the room. It says nothing about whether they can perform the task at 2 am with the plant manager on the phone. For an emission control device that sits between your engine and your compliance record, that difference matters.

It helps to separate three layers of competence:

Knowledge: the operator can explain what the RECD does, what normal looks like and why bypassing it is a compliance risk.
Skill: the operator can physically do the task correctly: carry out the pre-start walk-round, start with the RECD in circuit, read the indications, record them at a stated load, and shut down in the right sequence.
Judgement: the operator can decide what to do when something is not normal: when to keep running, when to reduce load, when to stop, and whom to call.

A good handover assessment tests all three, but weights skill and judgement more heavily. Most operators can explain a high back-pressure alarm; far fewer can respond to one with a log to fill and a call to make.

Three Competence Levels to Use

Keep the grading simple:

Aware: knows the task exists and why it matters, but cannot yet do it without being shown.
Assisted: can do the task correctly with prompting or with a competent person beside them.
Independent: does the task correctly, unprompted, and can explain the reasoning. Only Independent operators should be rostered alone.

The RECD Handover Competency Matrix

The matrix below is the backbone of the assessment. Print it with a column per operator and record the level and evidence for each row. Adapt the wording to your RECD design: some units have controllers, ΔP and temperature indications and alarms, while others are passive.

Skill area	What the operator must show	Evidence the assessor records	Target level
Device awareness and “normal”	Explains what the RECD does, identifies its main parts and indications, describes normal smoke at start and at load	Verbal answers noted; walk-round observed	Independent
Pre-start checks	Completes a visual check of RECD, joints, supports, cables and sensor connections without prompting	Completed checklist signed by operator	Independent
Start, run, shutdown	Starts and stops the DG with the RECD in circuit following site procedure, including any cool-down	Assessor observation note with times	Independent
Readings at stated load	Records load, ΔP and temperature (if fitted) and visual smoke at a defined load point	Logbook entry checked against panel values	Independent
Alarm recognition and response	Identifies each alarm or warning, states the correct first action and escalation, refuses bypass	Scenario score sheet	Independent
Safe access	Applies hot-surface precautions, lockout/tagout and sampling port rules	Observation plus verbal check	Independent
Operator-owned housekeeping	Performs the tasks the operator owns and names tasks reserved for the supplier	Task demonstration and verbal list	Independent
Documents and inspection readiness	Locates certificate, consent, O&M manual and logbook; answers likely inspector questions	Timed document retrieval; Q&A notes	Independent

Every row asks for evidence, not a tick. “Trained” is not evidence.

Understanding the Device and What Normal Looks Like

Operators cannot recognise abnormal behaviour unless they know what normal looks like on their own installation.

Can the operator explain the device in plain terms?

Ask them to describe, in their own words, what the RECD is there to do and roughly how it does it on your unit. A good answer covers capturing particulate matter from the exhaust, why the device is type approved, and why the DG set must not run without it in circuit. If they want a refresher on fundamentals, point them to this plain-language explanation of how an RECD works.

Pre-start visual checks

The operator should walk round the DG and the RECD before each planned start and complete the site checklist. Typical items include:

Exhaust joints, clamps and flexible connections for visible soot streaks, which suggest a leak.
Supports and hangers for looseness or obvious movement since the last check.
Insulation and heat shields intact, with no oil-soaked lagging.
Sensor and controller cables secured, away from hot surfaces, with connectors seated.
Any controller or panel showing healthy status before start, if your design has one.
Sampling port caps in place and no tools or rags left near the exhaust.

Reading ΔP and temperature indications, if fitted

Where your RECD has a differential pressure (ΔP) or exhaust temperature indication, each operator must know where it is displayed, what units it reads in and what the commissioning baseline looked like at a known load. The commissioning engineer should leave a short “normal band” sheet near the panel. If they did not, add it to your snagging; the guide on closing the RECD punch list before handover explains how to hold items open until they are done.

Operators should understand the simple relationship: as the device loads with soot, resistance to flow rises, and so does back-pressure on the engine. The reasons this matters to the engine are explained in how exhaust back-pressure affects a DG set. Where the design regenerates (burns off collected soot), operators should know what that looks like on the indications so they do not mistake it for a fault. DieselNet’s overview of particulate filter regeneration is useful background for supervisors.

Normal smoke behaviour at start

Every DG produces a brief puff at start. Operators should know what is normal for your set with the RECD fitted: how long any visible smoke lasts, and what it should look like once warm and on load. Persistent dark smoke, smoke from joints rather than the stack outlet, or a sudden change from yesterday’s pattern are all reportable. For engine-side causes, the post on why a generator emits black smoke is a good reference for the maintenance team.

Start, Run and Shutdown With the RECD in Circuit

Starting sequence

The operator should follow the site start procedure in order, without skipping the RECD-specific steps. That usually means completing the pre-start check, confirming any RECD controller is powered and healthy, starting the set, and observing indications during warm-up.

Running checks

Once on load, the operator should check the RECD indications at defined intervals, not only when an alarm sounds.

Shutdown and cool-down

If the supplier specifies an off-load cool-down period or a particular shutdown order for the RECD controller, the operator must follow it. Check the O&M manual and confirm the operator can state the cool-down time and why it exists.

Recording Readings at a Stated Load

A reading without a load figure is close to useless. ΔP and exhaust temperature both move with load, so a log entry that says “ΔP high” without the kW or percentage load cannot be compared with anything.

What a good entry contains

Each RECD log entry at a stated load should capture:

Date and time, written in one consistent format. The ISO 8601 date format (YYYY-MM-DD) avoids day-month confusion across shifts.
DG hour meter reading.
Load in kW or as a percentage of rating, read from the panel.
ΔP and exhaust temperature, if indicated.
Visual smoke observation at the stack.
Any alarms, warnings or events since the last entry.
Operator name and signature.

Test the habit, not the form

Ask the operator to bring the set to a stated load, wait for stable readings and record them, then compare entries with the panel. Missing units and “same as above” entries count against them. The format and discipline for passing this information between shifts is covered in the companion guide on building an RECD shift-handover log.

RECD Alarm Response Training: Recognise, Act, Escalate

Recognition

Each operator should be able to point to every alarm and warning the RECD can raise, name it and say what it means in practical terms. Use the supplier’s alarm list from the O&M manual, not memory.

First action

For each alarm, the operator should state the correct first action from your site procedure. Typical patterns, which you must confirm with your supplier for your specific design, include:

A high ΔP warning: note load and readings, reduce load if the procedure allows, inform the supervisor, and plan a controlled stop if the reading keeps rising.
A sensor fault or reading out of range: record the exact indication, check whether the value is physically plausible, and report; do not assume the device is fine because the engine sounds normal.
A controller power or communication fault: check what the panel shows, report immediately and follow the site instruction on whether continued running is permitted.

Escalation

The operator must know whom to call, in what order, at any hour. Put the escalation chain on the panel door: shift supervisor, maintenance head, then the supplier’s service line. The response the supplier has committed to should match what your team expects, as discussed in RECD service response commitments.

Never bypass

Ask directly: “If the alarm will not clear and the building needs power, would you open the bypass or disconnect the device?” The only acceptable answer is no. Running a DG with its RECD bypassed or removed is a compliance risk that can lead to sealing and penalties, and it can also void warranty cover. Anyone who hesitates on this question is not Independent, regardless of how they score elsewhere.

Safe Access: Hot Surfaces, Lockout/Tagout and Sampling Ports

Hot surfaces

RECD bodies and exhaust pipework stay hot long after shutdown. Operators should state how long they wait before touching any part, what gloves and PPE they use, and why insulation must never be removed for a “quick look”.

Lockout/tagout

Any task that brings an operator inside the guard or near moving or energised parts needs isolation. The operator should demonstrate how the DG start circuit is isolated and tagged, and how any RECD controller supply is isolated, using your site permit system. OSHA’s guidance on control of hazardous energy is a sound reference if your site procedure needs strengthening.

Sampling port safety

Sampling ports are for test agencies and the supplier, not routine operator use. Operators should know where they are, that caps must stay fitted, and what access rules apply. Where ports are at height on a tall stack, the risks increase considerably; see safe access to RECD sampling ports on tall chimneys.

Operator-Owned Tasks vs Supplier-Reserved Tasks

What the operator typically owns

Your division will depend on the supplier’s O&M manual and your service agreement, but operator-owned tasks usually include:

Daily and pre-start visual checks.
Recording readings at stated loads.
Keeping the area around the RECD clean and free of stored materials.
Reporting leaks, loose supports, damaged insulation or cable damage.
Following any operator-level routine the supplier specifies.

What is usually reserved for the supplier or authorised service

Opening the RECD housing or removing filter elements.
Cleaning, ash removal or core replacement.
Sensor replacement or recalibration.
Controller setting or firmware changes.
Any modification to exhaust connections.

Ask each operator to sort a shuffled list of ten tasks into “mine” and “not mine”. The task boundary should match the split agreed in customer and installer responsibilities for an RECD project, and the routine schedule in the RECD maintenance guide. Unauthorised work inside the device is a common reason warranty claims become difficult, which is why the sibling guide on what to record when raising an RECD warranty claim stresses keeping a clean service history.

Documents: Where They Live and What an Inspector May Ask

Know where the paperwork is

An SPCB or other authority’s inspector may arrive when only the shift operator is present. That operator should be able to produce, within a few minutes:

The RECD type approval or test certificate copy.
The consent to establish or operate, or the relevant permission for the DG set, as applicable to your site.
The O&M manual for the RECD.
The current RECD and DG logbook.
The supplier’s service contact and the last service record.

Run a timed retrieval. “It’s in the locked admin office” is a fail; fix the storage, not just the operator.

Questions an inspector may ask the operator

Operators should be ready for straightforward questions such as: “Is the emission control device installed and working?”, “When was it last serviced?”, “Show me today’s log”, and “What do you do if it alarms?” Supervisors can learn more from how to read an RECD test certificate and what happens during a pollution control board inspection. For the regulatory background, the Central Pollution Control Board is the primary source.

The Practical Sign-Off Test: A 90-Minute Observed Assessment

This is the RECD sign-off assessment itself. Run it at handover with the installer’s commissioning engineer present if possible, so gaps can be corrected on the spot.

Assessment script

Station 1 – Walk-round (10 minutes): operator performs the pre-start check unprompted. Beforehand, the assessor plants one safe, harmless item to find, such as a sampling port cap left slightly loose or a cable tie missing. Did they spot it?
Station 2 – Start and run (15 minutes): operator starts the DG with the RECD in circuit, narrates each step and confirms healthy indications during warm-up.
Station 3 – Readings at load (15 minutes): operator takes the set to a stated load, waits for stable readings and makes a full log entry.
Station 4 – Simulated high back-pressure alarm (10 minutes): the assessor shows a card or uses the controller’s test function, if the supplier confirms it is safe to do so, presenting a rising ΔP warning. Operator states and acts out the response, including the escalation call.
Station 5 – Sensor reading out of range (10 minutes): the assessor presents a log extract with an implausible temperature value. Operator explains what they would check and report.
Station 6 – Inspector visit (10 minutes): the assessor plays an inspector, asks four questions and requests three documents.
Station 7 – Shutdown and safe access (15 minutes): operator performs shutdown with cool-down, then demonstrates isolation and tagging for a cleaning task near the RECD, and states hot-surface precautions.

Total time is about 90 minutes per operator, or 60 if stations 4 and 5 are run as short verbal scenarios.

Scoring table

Station	0 points	1 point	2 points	Critical?
1 Walk-round	Missed most items	Needed prompts	Complete, found planted item	No
2 Start and run	Wrong sequence	Correct with prompts	Correct, unprompted	No
3 Readings at load	Missing load or values	Minor errors	Complete and accurate	No
4 High ΔP alarm	Would bypass or ignore	Correct but slow or incomplete escalation	Correct action and escalation	Yes
5 Out-of-range reading	Accepted value	Questioned it, unsure of next step	Questioned, checked, reported	No
6 Inspector visit	Could not find documents	Found most, vague answers	All found, clear answers	No
7 Shutdown and safe access	Unsafe act	Minor omission	Safe and complete	Yes

Pass rule

Independent: 11 or more out of 14, and 2 points on both critical stations.
Assisted: 7 to 10 out of 14, or 1 point on any critical station, with no zeros on critical stations.
Aware: 6 or fewer out of 14, or any zero on a critical station.

A zero on a critical station overrides the total. An operator who would bypass the device, or who acts unsafely around a hot exhaust, cannot be Independent no matter how good their paperwork is.

When an Operator Fails: Retraining and Shift Coverage

Treat failures as information

If several operators fail the same station, the training was weak, not the people; raise it with the supplier before signing. If one operator fails, coach them on that station and reassess it within two weeks.

Covering every shift

Handover is only safe when every shift has at least one Independent operator on duty. Check coverage across:

Each regular shift: day, evening and night.
Relievers: the people who cover leave and absences are often the least trained.
Contract operators: if a facility management contractor supplies staff, their people need the same assessment, and the contract should require replacements to be assessed before working alone.
New joiners: add the sign-off test to induction. Until they pass, they are paired with an Independent colleague.

Keep the competency matrix as a living register, not a handover-day document.

Refresher Training Triggers

Schedule a refresher and reassessment when any of the following happens:

Staff turnover: a new operator, supervisor or contractor team.
Controller firmware or settings change: alarm text, thresholds or displays may have changed.
After a fault or alarm event: review what happened in a short debrief and update the procedure.
After long inactivity: a set that has stood idle for months needs careful recommissioning, and operators should rehearse it; see restarting an RECD-equipped DG set after long inactivity.
Before GRAP season in Delhi NCR: DG use is restricted under directions from the Commission for Air Quality Management, and inspection activity tends to increase. A pre-season refresher in September or early October is sensible. The site-level implications are summarised in GRAP rules for DG sets in Delhi NCR.
Annually, as a minimum.

Illustrative Example: An 8-Person Operator Team

The following is illustrative and not based on a specific site.

A commercial building runs three shifts (A, B and C) with two operators each, plus two relievers who cover leave. That is 3 × 2 + 2 = 8 people. All eight sit the sign-off test on handover day.

Assessment results

Person	Role	Score (of 14)	Stations 4 and 7	Level
A1	Shift A	13	2, 2	Independent
A2	Shift A	12	2, 2	Independent
B1	Shift B	10	2, 1	Assisted
B2	Shift B	9	1, 2	Assisted
C1	Shift C	12	2, 2	Independent
C2	Shift C	11	2, 2	Independent
R1	Reliever	12	2, 2	Independent
R2	Reliever	11	2, 2	Independent

Coverage calculation

Independent operators: A1, A2, C1, C2, R1, R2 = 6.
Overall coverage: 6 ÷ 8 = 0.75, so 75%.
Shift A: 2 of 2 Independent, covered.
Shift B: 0 of 2 Independent, not covered.
Shift C: 2 of 2 Independent, covered.
Relievers: 2 of 2 Independent.

A headline 75% looks acceptable, but Shift B has nobody who can be left alone with an alarm.

Action plan

Roster R1 onto Shift B from handover until B1 and B2 are reassessed, leaving R2 to cover leave across all three shifts.
Coach B1 on shutdown, cool-down and safe isolation (station 7) and B2 on alarm response and escalation (station 4).
Reassess B1 and B2 on their weak stations within 14 days, with the supplier’s engineer present if possible.
If both pass, coverage becomes 8 ÷ 8 = 100%, and R1 returns to the reliever pool.
Record the interim arrangement in the handover note so the sign-off is conditional, not open-ended.

FAQ

What is RECD operator training at handover meant to prove?

It should prove that each operator can safely start, run, monitor and shut down the DG set with the RECD in circuit, respond correctly to alarms and produce records and documents on demand. Attendance alone does not prove this; an observed practical test does.

How long does an RECD handover competency check take?

Plan for 60 to 90 minutes per operator. Simpler RECDs without controllers or sensors need less time, while units with several alarms and indications need the full script.

Who should assess the operators?

Ideally your maintenance head or EHS lead, with the supplier’s commissioning engineer present to correct gaps on the spot. The assessor should not be the person who delivered the training session, so the check is independent.

Can we accept handover if some operators fail?

You can accept with conditions, provided every shift has at least one Independent operator rostered and a dated retraining plan is written into the handover note. Do not accept if any shift is left without cover.

Should operators ever bypass the RECD during an emergency?

No. Bypassing or removing the RECD is a compliance risk that can lead to sealing and penalties. The correct response is to follow the site procedure, reduce load or stop if required, and escalate to the supervisor and supplier.

How often should operators be reassessed?

At least once a year, and whenever there is staff turnover, a controller or firmware change, a significant fault, long inactivity or the run-up to GRAP season.

Make Handover Day Count

Aceget supplies CPCB type-approved retrofit emission control devices for DG sets from 25 kVA to 2500 kVA, and we would rather your night shift is confident than just signed off. You can review our type approval and certification details before handover, and if you would like help planning operator training or a practical sign-off session for your site, contact the Aceget team.

RECD Operator Training: Skills to Check Before Handover