Crude Desalting Level and Interface Measurement

Crude desalting removes inorganic chlorides, suspended solids, and trace metals from unrefined crude oil through chemical or electrostatic treatment. This upstream refining process is essential to reducing corrosion risk, preventing catalyst poisoning, and protecting downstream distillation equipment. Accurate level and interface measurement in crude desalters—particularly monitoring the oil/water interface and emulsion layer—is critical to process efficiency, salt removal effectiveness, and equipment protection.

Measurement Challenges in Crude Desalters

Crude desalting units present demanding measurement conditions that require specialized instrumentation:

• Coating and buildup — Process fluids coat probes and create interface measurement errors over time
• Emulsion layer control — The oil/water interface includes an unstable emulsion layer that fluctuates in thickness and density, making precise boundary detection difficult
• Electrostatic interference — High-voltage electrostatic fields used in desalting can interfere with electronic measurement devices
• Probe fouling — Suspended solids, asphaltenes, and wax deposits foul contact-based sensors, reducing accuracy and requiring frequent maintenance

Instruments susceptible to electrostatic grid interference or probe coating may require special filters, interface-dedicated level transmitters, or frequent cleaning to maintain optimal performance.

AMETEK LMS Solutions for Crude Desalting

AMETEK Level Measurement Solutions provides proven instrumentation engineered for the harsh conditions of crude desalting operations. Technologies such as Guided Wave Radar (GWR) and displacer-based level transmitters offer reliable oil/water interface detection while resisting coating, fouling, and electrostatic interference. These solutions help refiners maintain precise desalter level control, optimize chemical treatment efficiency, and reduce maintenance downtime—ensuring consistent salt removal and protection of downstream refining units.