How to diagnose a cold Armstrong 800 steam trap
A cold trap means no steam is reaching it. Check the upstream isolation valve first, then the inlet strainer. A cold trap with upstream steam and no isolation valve closed is a failed-closed trap or a plugged strainer.
How to diagnose continuous discharge on an Armstrong 800 steam trap
An Armstrong 800 inverted-bucket trap at full condensate load will discharge nearly continuously. Distinguish normal operation from a fault by checking with an ultrasonic tester: continuous high-frequency noise means steam loss; intermittent modulated noise at high rate is normal condensate discharge.
How to fix steam loss from a failed-open Armstrong 800 steam trap
A failed-open trap is blowing live steam continuously. Confirm with an ultrasonic tester, then isolate and replace the trap internals (the Armstrong 800 has a replaceable bucket module). Leaving a blown trap in service wastes significant energy.
How to fix waterlogging from a failed-closed Armstrong 800 steam trap
A failed-closed trap does not discharge condensate, causing waterlogging upstream. Test with an IR thermometer: the trap inlet will be cold. Isolate, clear the strainer, and replace the trap internals if the strainer is clean.