Conducting a hot-surface temperature survey
A hot-surface temperature survey walks a plant to find uninsulated or poorly insulated hot surfaces, recording their temperature and area to quantify heat loss and burn risk. It is the diagnostic step that turns 'we should insulate more' into a prioritised, costed list of specific surfaces.
What it is
The survey systematically identifies every hot surface — pipes, valves, vessels, fittings — that is bare, has damaged lagging, or runs hotter than it should. Each is logged with its temperature, size and accessibility, building the evidence base for an insulation programme.
Why it is done
Standing heat loss is invisible on any control screen, so it persists until someone measures it. A survey makes the loss visible, ranks surfaces by how much energy and how much burn risk each represents, and provides the justification and scope for targeted insulation rather than guesswork.
How it is done
A surveyor walks the hot systems with a contact or infrared thermometer, recording surface temperature, dimensions and condition of insulation for each item. Heat loss is estimated from temperature and area, items are ranked by loss and safety risk, and the result becomes a prioritised insulation scope. Findings double as a safety record for surfaces above touch-safe limits.
- Plan survey route
- Measure surface temp
- Record area & condition
- Estimate heat loss
- Rank by loss & risk
- Produce scope
What to watch for
Surveying without recording area makes it impossible to estimate loss or prioritise. Treating it as a one-off ignores that lagging gets damaged and removed over time, so periodic re-survey is needed.
Related practices
Retrofitting removable insulation to hot equipment
Maintaining a thermal oil heating system
Running an insulation jacket inspection programme
Related topics
Surface Temperature · Heat Loss · Thermography (Infrared Inspection)
Common in: Food Processing · Chemicals · Power Generation · Steel & Metals · Cement · Paper & Packaging