Instrumentation and Calibration Readiness for Natural-Gas Contractors

Inventory first

Assign a unique identifier to every instrument. Anonymous instruments cannot be defended in an audit.

• Combustible gas indicators and leak detection instruments.
• Pressure gauges, recorders and test manifolds used for strength and leak testing.
• Fusion equipment data loggers and temperature measurement devices.
• Locating equipment, multimeters, and any instrument whose reading appears on a record you hand to an operator.

Records worth keeping

• Calibration certificate with traceability to national standards, per the instrument's applicable standard.
• Calibration date, due date, performing organization, and as-found/as-left readings.
• Bump-test or field-verification logs where the manufacturer or operator expects them.
• Assignment history: which crew or job held the instrument during each period.

Intervals are not universal

Calibration intervals come from the manufacturer's instructions, the applicable operator specification, and your own use history — not from a single industry-wide number. Document the basis for each interval you adopt so it can be explained rather than defended after the fact.

Overdue or out-of-tolerance instruments

• Remove the instrument from service immediately and tag it so it cannot be reissued.
• Identify the work performed since the last valid calibration.
• Notify the operator where readings may have affected accepted records.
• Record the impact assessment and corrective action, even when no rework is required.