Five Oil Temperature Points and What They're Actually Telling You
The template tracks oil temp at five distinct measurement points. That isn't redundancy — that's a bearing wear map. If oil temp 1 and oil temp 3 are trending up while oil temp 2 holds stable, you're watching a localized load develop in real time. A paper logsheet sees five columns and transcribes numbers. A Memento logsheet sees five time-series and flags a gradient. The difference between those two things is the difference between catching a bearing fault in week two and replacing a rotor in week eight.
What Breaks When You're Logging Turbine Data on Paper
The round is every four hours. The operator writes turbine speed in RPM, condenser vacuum in kPa, steam pressure before and behind the governing stage, axial oil pressure, lube oil pressure, hot well level — twenty-odd readings per round, per shift, per unit. On paper, that data is entombed. It's transcribed, initialed, filed, and never seen again until something goes wrong and someone pulls binders.
What you lose is trend visibility. Condenser vacuum dropping 3 kPa over two weeks is invisible on individual sheets. Turbine expansion creeping toward its upper mechanical limit shows up as a number in a column, not as a pattern crossing a threshold. The governing stage differential — steam before minus behind — tells you about nozzle wear, but only if you're graphing it, and nobody is graphing paper.
The exhaust chamber temperature and pressure fields get logged twice per shift. If exhaust chamber temp is climbing while condenser vacuum is holding, you're looking at a condensate system issue — either the condensate pump is losing head (check the pressure and amperage fields) or the WJP vacuum is degrading. You can chase that logic on paper, but it takes an experienced hand and good notes. In Memento, you filter the last 30 days of exhaust chamber temp against condensate pump press and the correlation is immediate.
The Shift That Proves the System Works
It was a Saturday, second shift, the kind where handover is fast and the outgoing operator is already out the door. The incoming operator opened the logsheet for Turbine #1 and ran a quick filter on the last seven days of turbine expansion readings. The value had been climbing — 0.3 mm over the week, well within spec, but the slope was wrong for this time of year and this load profile. She flagged it, pulled the travel piston and servo records for the same period, and called maintenance before the third round.
The rotor was running 18°C above seasonal norms on the upward expansion side. Nothing on that shift would have indicated a problem in the raw numbers. The pattern only existed in the historical record.
The WJP fields — press in, press out, amp draw, vacuum — are there specifically because water jet pump degradation is slow and insidious. The amp draw climbs before the pressure differential shows anything unusual. Logging both values every round and graphing the ratio over 90 days tells you when you're six weeks from a pump pull, not six days.