FIELD: heat engineering.
SUBSTANCE: invention relates to heat engineering and can be used for heat exchangers. In heat exchanger (1), in particular a high-pressure heat exchanger for urea synthesis, comprising a group of heat transfer tubes (3) for transporting first fluid (F1) in order to transfer heat between first fluid (F1) and second fluid (F2) through heat transfer tube (3), fibre-optic sensor (2) is installed on at least one of said heat transfer tubes (3), wherein said fibre-optic sensor (2) is configured for interferometric determination of elastic vibrations, in particular natural vibrations of corresponding heat-transfer tube (3), during operation of heat exchanger (1), to determine the wall thickness of corresponding heat-transfer tube (3). Invention also relates to a method of operating heat exchanger (1).
EFFECT: increased convenience and simplicity of heat exchanger operation.
15 cl, 7 dwg
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