For particularly rigorous leak checking of condensors (for example: sea water cooled condensers in coastal power stations), portable helium leak detectors such as the HeliTest or PHD-4 (or, perhaps, a mass spectrometer) may be the instrument of choice.
Helium leak detection plays a vital role in leak checking valves, tubes, flanges, heat exchangers and distillation columns, which require routine maintenance and frequent leak monitoring.
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