Oil & Gas Instrument Calibration
In fuel handling, measurement is the transaction. Meters at loading racks and terminal gates decide what is invoiced, tank instrumentation decides what inventory is believed to exist, and pressure instruments protect equipment holding hazardous product. All three demand documented, traceable calibration — and most of them cannot be taken out of service casually.
Typical measurement points
Custody transfer and loading meters
Where product changes ownership, the meter error transfers value in one direction with every batch. Documented error percentage is what makes an invoice defensible.
Tank inventory and reconciliation
Level, temperature and density combine into a stock figure. An error in any of them shows up as an unexplained inventory difference.
Line balance across the terminal
Receipts against deliveries; when they disagree, calibration decides which meter is at fault instead of leaving it to argument.
Safety-critical pressure points
Instruments feeding alarms, trips and interlocks on hazardous service, where an undetected drift is a protective function that will not act.
Temperature compensation
Volume corrected to reference temperature is only as good as the temperature measurement behind the correction.
Silent revenue loss on a custody-transfer meter that has drifted within its own alarm limits Inventory differences that get written off rather than traced to an instrument Orifice plate erosion and deposits changing a DP flow calculation Zero shift on pressure transmitters after an over-pressure excursion Interlocks that appear healthy because the instrument reports plausible values
Documented traceability for meters used in commercial transactions Calibration records for instruments in safety-related functions Proof-test documentation for safety loops, in line with IEC 61508 / IEC 61511 Environmental permit reporting that depends on measured throughput Quality-system evidence that critical measurement is under control
Calibration procedures follow ISO/IEC 17025 methodology; ESYD accreditation is in progress.
Related services
Common questions
Tell us about the measurement point you need checked
Describe the instrument and your plant, and we will tell you what can be verified in-situ, what needs a workshop calibration, and what it will take.
Keep your instrumentation performing at its best
Speak with SEMAC's service team to discuss your maintenance needs and plan your verification & calibration service.