How can a small temperature pocket become a cargo-containment problem on an LNG carrier?

In this OSSA LNG episode, we follow the liquid cargo from the terminal connection to the ship’s tanks, then examine the thermowell: the protective pocket that separates a temperature sensor from flowing LNG.

We explain where this component fits into the installation, why temperature is measured there, and how flow-induced vibration and repeated bending can contribute to fatigue failure.

A fractured thermowell can leave a detached fragment inside the cargo system. If its wall is breached, LNG may enter the sensor cavity; whether it escapes outside depends on the remaining sealing arrangement. We also examine SIGTTO’s historical account of leakage associated with cryogenic deck fracture, while recognising the limits of the published evidence.

The central lesson: a normal temperature reading does not confirm that the thermowell is intact or leak-tight.

Designed for maritime students, cadets and engineers who want to connect component design with the practical realities of shipboard systems.

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This episode provides educational context and does not replace vessel-specific procedures or manufacturer guidance.

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LNG thermowell failure, thermowell, LNG carrier, LNG cargo systems, temperature measurement, temperature sensor, cargo piping, cryogenic safety, LNG leakage, vortex shedding, flow-induced vibration, fatigue failure, marine engineering, maritime safety, maritime students, deck fracture, SIGTTO, OSSA LNG, My LNG