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Run: Dielectric Oil Sampling for Dissolved Gas Analysis (DGA)

This SOP template guides transformer dielectric oil sampling for dissolved gas analysis, from safe access and purge to sealing, labeling, and chain of custod...

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Steps

The supervisor or assigned technician confirms the work order, transformer identification, sample point, required test, and laboratory bottle specification before work begins.
The technician verifies that the sampling point is accessible and that site controls are in place before approaching the equipment.
The technician lays out the DGA sample kit, checks the bottle or syringe type against the lab requirement, and confirms that all containers are clean and undamaged.
The technician purges the valve and discards the initial flow until the oil stream is stable and visibly clear, following site disposal controls for purge oil.
The technician collects the sample using the lab-specified evacuated bottle or syringe technique, avoiding air entrainment, contact with the container opening, and overfilling.
The technician seals the bottle immediately after filling and applies the required label information before leaving the sampling point.
The technician completes the chain of custody form so the sample record matches the bottle label and documents custody transfer from collection to shipment.
The technician places the sealed sample into approved secondary containment and dispatches it to the accredited laboratory under the required handling conditions.
The technician determines whether the sample can proceed or must be recollected and escalated, and records any deviation in the work order.
The technician quarantines the compromised sample, documents the non-conformance, and notifies the supervisor or competent person.
The supervisor or assigned reviewer confirms the sampling event is fully documented, traceable, and ready for laboratory follow-up and maintenance review.

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