We do lift checks for bearing clearance. It doesn't seem very precise.Is there an ISO or ANSI standard for PM's on turbines?

Can check ISO website.

What is a lift check?

I take it that you are talking about plain bearings. We do lift checks. They seem to be OK. There is a wee bit of doubt because of possible clearance in the bearing carriers, however, as a check, they are usually acceptable. If the bearings are in good nick, the readings should be OK, if not you'll probably see white metal in the oil.
Regards,
Joe Mc Cormack

To my understanding, lift checks enable measurement of the vertical clearance in a plain bearing. The bearing is not dismantled, but access is arranged to set up a dial gauge on the shaft. The shaft is slung to an overhead crane and lifted carefully. Gauge readings before and after give the clearance.

Another way is to lift the bearing caps, place a piece of soft material on the shaft, then lower the caps. When caps are lifted off, the material can then be measured to find the clearance. Search for PLASTIGAGE.

I do not know if there are any ISOs etc. on steam turbine maintenance overall. I suspect that most owners follow OEM recommendations, with some using them as one input to their decision.

Ray Beebe (28 years in steam power generation, but the interest never lost!()

API only has a standard for manufacture of steam turbine and another for repair of rotors.

For PM, we have to rely on OEM manual and best practices in the industry.

Doesn't the steam or nuclear power generation industry have a recommended practice for steam turbine maintenance in general?