Agree on the Requested Tests Before Collection

Start by confirming the analyses needed and the receiving laboratory’s instructions. Do not assume that a container or sample quantity suitable for one analysis is automatically appropriate for every requested test.

Include the required method references in the work request where applicable. This helps the collection team and laboratory identify the procedure that governs the task.

Keep Identification Specific and Consistent

Use a unique sample identifier and the same identifier on the container, collection form, laboratory request, and resulting report.

Record the equipment reference and the actual sampling point. A description such as “transformer oil” may be insufficient where several assets or compartments are being sampled during the same visit.

Suggested Sampling Record

The table below is a practical template to adapt to the approved procedure. It is not a mandatory field list reproduced from a standard.

Separate Observations from Assumptions

Write down what was observed. For example, “closure damaged on receipt” is more useful than an unsupported statement that the sample was definitely contaminated.

Missing information should remain visible until it is resolved. If a field is corrected after collection, preserve who made the correction and the basis for it rather than silently replacing the original entry.

Resolve Concerns Before Treating the Result as Representative

Where identification or handling is uncertain, contact the responsible collection team and follow the laboratory’s acceptance procedure. Document whether the sample is accepted, tested with a stated limitation, or replaced.

Keep the laboratory sample number connected to the original field identifier. This makes it easier to review the report later alongside other results and maintenance records.

Frequently Asked Questions

Can one universal bottle and storage rule be used for all oil tests?

Do not assume so. Confirm the requirements for the requested analyses with the receiving laboratory and applicable sampling procedure.

Does this checklist explain how to operate a sampling valve?

No. It addresses records and traceability. Physical sampling must follow the equipment-specific procedure and be performed by appropriately trained personnel.

Should rejected or replaced samples disappear from the records?

Retain the history and the reason for replacement so that the final report can be interpreted with a clear audit trail.