Quick Answer
Prism Calibration Centre (NABL CC-2480) provides calibration for Gujarat's oil and gas industry: HART pressure/temperature transmitters (Rosemount, Yokogawa), custody transfer flow meters, gas analysers, safety relief valves, and ex-proof instruments — with OISD, API, and IEC 61511 compliance documentation.
Key Takeaways
- Oil and gas calibration must meet OISD (Oil Industry Safety Directorate) standards.
- Custody transfer meters require the highest calibration accuracy (Coriolis: ±0.1%, ultrasonic: ±0.2%).
- Safety-instrumented systems (SIS) in refineries require IEC 61511 compliant calibration.
- Flameproof/intrinsically safe instrument calibration available for hazardous areas (Zone 1, Zone 2).
- Prism has experience with ONGC Ankleshwar, GSPC, and oil & gas EPC contractors in Gujarat.
Oil and Gas Instruments Calibrated at Prism
- HART pressure and differential pressure transmitters (wellhead, pipeline, vessel)
- Temperature transmitters and sensors (RTD, thermocouple — reactor, furnace)
- Custody transfer flow meters (Coriolis, ultrasonic, turbine)
- Gas analysers (H₂S, CO, LEL, SO₂, O₂ — safety monitoring)
- Tank level instruments (radar, ultrasonic, pressure-based)
- Safety relief valves (set pressure verification per API 520/521)
- Vibration monitors for rotating equipment (compressors, pumps)
- Pressure gauges for wellhead, separator, and pipeline applications
Custody Transfer Calibration — The Highest Accuracy Requirement
Custody transfer metering (billing between producer, transporter, and buyer) requires the highest metering accuracy in the oil and gas industry. A 0.1% error in a 100,000 bbl/day crude oil custody transfer meter translates to 100 barrels/day — crores of rupees annually. OISD Standard 173 and API MPMS require traceable calibration with metering uncertainty statements for all custody transfer meters.
Safety Instrumented System (SIS) Calibration
IEC 61511 Functional Safety
Safety instrumented systems (SIS) in refineries — emergency shutdown (ESD), fire and gas systems, HIPPS — must be maintained and tested per IEC 61511. Calibration of SIS transmitters and final elements (valves) is part of the safety integrity level (SIL) maintenance requirement. Prism provides SIS instrument calibration with full IEC 61511 traceability documentation.
Frequently Asked Questions
Can Prism calibrate instruments at refineries and process plants in Gujarat?
Yes. Prism's mobile calibration team performs on-site calibration at refineries, gas processing plants, and petrochemical facilities across Gujarat, including ONGC Ankleshwar, GSFC Vadodara, and Reliance Industries facilities.
Does Prism calibrate intrinsically safe instruments?
Yes. Prism calibrates intrinsically safe and flameproof (ATEX/IECEx) instruments including pressure transmitters, temperature transmitters, and gas detectors certified for Zone 1/Zone 2 hazardous areas.
What OISD standards apply to oil and gas instrument calibration?
OISD-STD-173 (Flow Measurement), OISD-STD-116 (Fire Protection), OISD-STD-178 (Inspection and Safety of Pressure Relief Devices) are the key standards. Prism's NABL calibration satisfies the traceability and documentation requirements of these standards.
Can Prism calibrate H₂S gas detectors?
Yes. Prism calibrates H₂S (hydrogen sulphide) detectors, CO detectors, and LEL/UEL combustible gas detectors using NABL-certified reference gas mixtures in calibrated gas cylinders.
How does NABL calibration support SIL (Safety Integrity Level) compliance?
SIL-rated instruments must be maintained with documented calibration and proof-testing records. NABL calibration certificates from Prism provide the measurement accuracy and traceability data required by functional safety assessors during SIL assessments.
Written by
Er. Parthiv Kinariwala
Managing Director · Prism Calibration Centre · NABL CC-2480 · Ahmedabad
Er. Parthiv Kinariwala founded Prism Calibration Centre in 2004 and has over 20 years of hands-on experience in calibration engineering, NABL accreditation, and industrial compliance. His team performs 10,000+ calibrations annually from the Vatva GIDC laboratory, serving 5000+ industries across Gujarat.
Prism Calibration Centre — Vatva GIDC, Ahmedabad
Prism Calibration Centre
F-101, Rudraksh Complex 2, Phase 3, GIDC Vatva, Near Jasoda Nagar Cross Road, Ahmedabad — 382445, Gujarat, India
Phone: +91 98245 26444
Email: info@prismcalibration.com
NABL: CC-2480 · ISO/IEC 17025:2017
Hours: Mon–Sat, 9:00 AM – 7:00 PM