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Extraction cleaning - verification
Under TR19 Grease, cleaning the system is only half the job. Verifying it - measuring the result and recording the evidence - is what turns a clean into compliance. Here is what verification actually means.
The short answer
Post-clean verification under TR19 Grease is the step that proves a clean actually achieved the standard: measuring grease deposit after cleaning to confirm it is at or below the required level, recording that with readings and photographs, and producing a verification report. Cleaning removes the grease; verification proves it was removed to standard. Without verification, you have a clean; with it, you have the evidence that makes the clean count.
Cleaning versus verifying
TR19 Grease treats a clean as two connected halves: doing the cleaning, and verifying the result. The cleaning is the physical work - removing grease from the whole system. The verification is proving that work achieved the standard - measuring what is left and recording the evidence. Both are required; a clean without verification is unfinished as far as the standard is concerned.
This is a deliberate feature of the standard, not an optional extra. Because grease is a measured hazard - judged by deposit thickness against a threshold - a clean can only be shown to meet the standard by measuring the result. Verification is how the standard converts cleaning from an activity into a demonstrable outcome, and it is what an insurer or assessor actually relies on.
What verification measures
The core of verification is measurement. After cleaning, grease deposit thickness is measured at representative points across the system and compared against the level the standard sets for a clean system - at or below 0.05 mm, fifty microns. The post-clean readings show whether the system was actually brought to or below that threshold, which is what defines a compliant clean under the standard.
Taking readings at representative points, rather than one convenient spot, is what makes the verification meaningful for the whole system. It is also paired with the pre-clean readings, so the record shows both the state the system was in and the state it was left in - the before-and-after that turns a claim of cleanliness into measured proof of it.
What verification records
Verification is not just a measurement taken and forgotten - it is recorded in a post-clean verification report. That report sets out the systems cleaned, the pre-clean and post-clean measurements, photographic evidence of the sections cleaned, and honest notes on anything that could not be reached. It is the document that evidences the whole clean, and it is what makes verification usable rather than merely done.
Where the work is carried out by a registered contractor, verification also connects to formal certification - a record generated through the recognised scheme that provides independent evidence of a compliant, or where relevant partial, clean. Together the report and the certification are the verification made tangible: the paperwork that proves, to anyone who needs to see it, that the system was cleaned to standard.
Why it matters
The reason verification matters is that, without it, a clean proves nothing. An unverified clean might have achieved the standard or might not - there is no measurement to say, and no record to show. To an insurer checking a policy condition, a fire risk assessor confirming the risk is controlled, or an inspector, an unverified clean is close to no clean at all, because there is nothing to rely on.
Verification is what converts the cleaning into the evidence those parties need. A verified clean comes with measured proof it met the standard and a record that can be produced on demand - so it satisfies the compliance the cleaning was done for. The measurement and the report are not bureaucracy; they are the entire point of working to a measured standard, and what distinguishes a compliant clean from a hopeful one.
The takeaway
The practical lesson is to treat verification as part of what you are buying, not an afterthought. A proper TR19 Grease clean includes measuring the result and producing the verification report and certification - so when you commission a clean, you should expect to receive that evidence, and a clean offered without it is not the full job the standard requires.
So the question to ask is not only whether the system will be cleaned, but whether the clean will be verified - measured, recorded and evidenced. That is what makes the clean count with an insurer, an assessor and an inspector, and it is the difference between a system you hope is compliant and one you can prove is. Under TR19 Grease, the verification is the proof, and the proof is the point.
Questions
The step that proves a clean achieved the standard - measuring grease deposit after cleaning to confirm it is at or below the required level, recording that with readings and photographs, and producing a verification report.
Because grease is a measured hazard, judged by deposit thickness against a threshold. A clean can only be shown to meet the standard by measuring the result. Verification converts cleaning into a demonstrable, evidenced outcome.
Grease deposit thickness after cleaning, at representative points across the system, compared against the level the standard sets for a clean system - at or below 0.05 mm, fifty microns.
The systems cleaned, pre-clean and post-clean measurements, photographic evidence of the sections cleaned, and honest notes on anything inaccessible - the document that evidences the whole clean, often with formal certification alongside.
Because without it a clean proves nothing - there is no measurement to say it met the standard and no record to show. To an insurer, assessor or inspector, an unverified clean is close to no clean, because there is nothing to rely on.
The verification as part of the job - the result measured, and a verification report and certification produced. A clean offered without that evidence is not the full job the standard requires.
We verify every clean - measuring against the standard and issuing a full report and certificate, so it counts when it matters.
