User's Manual

Vibration Meter
Interpret Results
33
Class III: Large prime-movers and other large
machines with rotating masses mounted on rigid and
heavy foundations that are relatively stiff in the
direction of the vibration measurements.
Class IV: Large prime-movers and other large
machines with rotating masses mounted on
foundations that are relatively soft in the direction of
vibration measurements (for example, turbo generator
sets and gas turbines with outputs greater than
10 MW).
ISO 10816-3
This standard is used to evaluate machine vibration by
measurements on non-rotating parts, for industrial
machines with nominal power above 15 kW and nominal
speeds between 120 RPM and 15,000 RPM when
measured in situ.
Key terms
Rigid: A machine foundation with the machine
supports rigidly attached to the machine skid and/or
the solid floor of the facility.
Flexible: A machine with flexible attachment between
the machine supports and foundation or facility floor.
The most common example of this is a machine in
which vibration isolators (flexible vibration damping
mechanisms) separate the machine and foundation.
Group 1: Large machines with rated power above
300 kW and not more than 50 MW (electrical
machines with shaft height: H ≥315 mm).
Group 2: Medium-sized machines with rated power
above 15 kW up to and including 300 kW, electrical
machines with shaft height 160 mm ≤ H <315 mm.
ISO 10816-7
This standard is used to evaluate machine vibration on
rotor dynamic pumps by measurements on nonrotating
parts.
Note
The standard includes guidance for
measurements on rotating shafts, but this portion
is not applicable to the Meter.
Key terms
Category I: Pumps that require a high level of
reliability, availability, or safety (for example, pumps for
toxic and hazardous liquids, critical applications, oil
and gas, special chemical, and nuclear or power plant
application).
Category II: Pumps for general or less critical
applications (for example, pumps for non-hazardous
liquids).