Liquid cargo contamination occurs when different liquid products mix unintentionally during transportation, causing quality degradation, specification failure and commercial loss. This is particularly critical for petroleum products, chemicals, edible oils, solvents and other sensitive liquid cargoes that require strict purity levels. Even a minimal level of contamination can significantly reduce the economic value of the product and, in some cases, render it completely unusable.

Such damages may result from inadequate tank cleaning, improper sequencing of cargoes, defective pumping equipment, worn–out valves, compromised tank integrity or incorrect line configurations. Contamination may also occur during transfer between terminal and vessel if hose connections or cargo lines are not properly segregated. In this context, professional survey work plays a crucial role in identifying the source, scale and responsibility of the contamination.

At Kuzey Marine Survey, contamination investigations are conducted through detailed technical inspections, operational analysis and laboratory-supported sampling. The process starts with collecting samples from the vessel and terminal, which are compared with predefined cargo specifications and load-port reference samples. Parameters such as density, color, purity, water content, viscosity and chemical stability are analyzed.

Onboard inspections include examination of the cargo lines, pumps, valves, tank coatings, previous cargo records, cleaning certificates and the entire cargo transfer sequence. Inspectors verify whether the cleaning chemicals, washing methods and washing durations were sufficient for the next cargo. They also investigate potential backflow issues, line cross-contamination, pressure irregularities or faulty operational procedures.

At the terminal, hose assemblies, manifold connections, pump pressure logs and loading records are reviewed. Combining all findings allows us to accurately determine where contamination occurred and the extent of the damage. The results are documented in a detailed report used by cargo owners, charterers and P&I clubs for risk assessment and claim management.

Liquid cargo contamination cases require technical competence, chemical knowledge and detailed operational understanding. With extensive experience in petroleum, chemical and food-grade cargoes, Kuzey Marine Survey provides comprehensive evaluations that fully comply with international maritime and insurance standards.

Our team not only identifies the root cause of the contamination but also evaluates future risks by analyzing cargo changeover plans, tank designs, cleaning procedures and terminal equipment. We provide corrective and preventive recommendations that help avoid recurring contamination issues.

All reports include photographic evidence, sampling analysis results and a clear explanation of responsibility distribution—making them fully suitable for insurance processes and legal claims. This ensures safer, more predictable and more efficient cargo operations for all stakeholders.