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Magnetrol - AMETEK
Level Instruments for Tank Overfill Prevention

Level Instruments for Tank Overfill Prevention

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Overview: This document provides recommendations for tank overfill prevention in petroleum storage facilities, referencing the American Petroleum Institute's (API) Recommended Practice (RP) 2350. It emphasizes the importance of level instrumentation as part of an Overfill Prevention System (OPS) to prevent incidents like the Buncefield Oil Depot overflow.

Applicability: The guidelines apply to above-ground storage tanks (ASTs) with capacities of 1320 gallons (5000 L) or more, storing Class I, II, or III flammable or combustible liquids.

Equipment: An Automated Overfill Prevention System (AOPS) should include alarm signal systems, shutdown or diversion valves, sensors, and logic solvers, all supported by an uninterruptible power supply.

Management System: API RP 2350 recommends a formal Overfill Prevention Process (OPP) involving training, procedures, risk assessment, inspections, testing, and maintenance.

Proof Testing: OPS equipment must be tested annually, with high-high (HH) sensors/alarm tested semi-annually. Testing methods include moving the tank level, manual proofer devices, wet probe tests, or self-diagnostics.

Independence and Redundancy: Sensors and alarms for HH levels must be independent from routine operations. Redundancy with disparate technologies is recommended to avoid failures.

Tank Categories: Tanks are categorized based on personnel attendance during operations:

Category I: Fully attended, manual termination.
Category II: Semi-attended, requires Automatic Tank Gauge System (ATGS).
Category III: Unattended, requires ATGS with independent HH sensor.

Levels of Concern (LOCs): LOCs are calculated product levels that determine alarm and alert positions and response times. Critical levels include Critical High, AOPS Activation, High-High, and Maximum Working Level.

Recommended Equipment: Various sensors and transmitters are recommended based on tank and roof types, including Eclipse® Guided Wave Radar, Pulsar® Radar, and Jupiter® Magnetostrictive Transmitters.

Conclusion: The document emphasizes the need for tailored solutions based on specific applications and encourages consultation of API RP 2350 for comprehensive guidance.

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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