Heat Tracing Commissioning Procedure: 9 Steps Before Handover

A heat tracing system that is not commissioned properly will still work on the day of handover and fail in the first winter. This procedure lists the nine checks that should be completed, and documented, before the system is accepted.

Why commissioning is not a formality

Insulation resistance, cold-start current and controller configuration can each be wrong in a way that only shows up at low ambient temperature. Commissioning is the only moment when those values can be recorded under controlled conditions and compared later.

Nine steps before handover

1. Review the design and as-built documents

Confirm circuit schedules, cable types, lengths, thermostat locations and area classifications match what was installed. Note every deviation.

2. Visual inspection before insulation is closed

Check cable spacing, fixings, bends, expansion loops, termination kits and junction box sealing while the pipe is still accessible. After cladding is fitted, this inspection is no longer possible.

3. Insulation resistance test (before and after insulation)

Record insulation resistance to earth for every circuit, with the cable disconnected from the panel. Test again after cladding and compare — a significant drop indicates mechanical damage during insulation work.

4. Conductor resistance and circuit continuity

Measure conductor resistance of each circuit and compare with the calculated value from cable data. A high reading points to a poor joint; a low reading to a short or a wrong cable length.

5. Power supply, protection and earth leakage

Verify voltage, MCB/RCBO ratings, earth leakage settings, and that each circuit is individually protected and labelled.

6. Controller and sensor configuration

Set the control range, alarm thresholds and fail-safe behaviour. Verify sensor readings against an independent thermometer and confirm the sensor is in contact with the pipe surface.

7. Alarm and interlock testing

Simulate high temperature, low temperature and earth fault. Confirm each alarm reaches the DCS or on-call phone, and that any interlock (for example with the process control system) behaves as designed.

8. Cold-start energisation and current record

Energise each circuit from cold and record the starting current, time to reach set point and steady-state current. These values are the baseline for all future maintenance.

9. Handover package and training

Deliver circuit schedules, test records, controller settings, spare parts list and operating instructions. Train the operating team on alarm response and isolation.

What the handover record should contain

Per circuit: cable type and length, insulation resistance before and after insulation, conductor resistance, cold-start current, steady-state current, controller settings and test date. One page per circuit is enough — and it is the single most useful document for the next ten years of operation.