TECHNICAL ASSOCIATES OF CHARLOTTE.pdf

TECHNICAL ASSOCIATES OF CHARLOTTE, INC. TABLE II. CRITERIA FOR OVERALL CONDITION RATING (RMS OVERALL VELOCITY, mm/s)rms 1. 2. 3. 4.

5.

Assuming Machine Speed = 600 to 60,000 RPM. Assuming Measurements by Accelerometer or Velocity Pickup securely mounted as Close as Possible to Bearing Housing. Assuming Machine is Not Mounted on the Vibration Isolated Machinery – Set Alarm 30% - 50% Higher). Set Motor Alarms the Same as that for the Particular Machine Type unless Otherwise Noted. Set Alarms on Individual External Gearbox Position about 25% Higher than of a particular Machine Type. MACHINE TYPE

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COOLING TOWER DRIVES Long, Hollow Drive Shaft Close Coupled Belt Drive Close Coupled Direct Drive COMPRESSORS Reciprocating Rotary Screw Centrifugal With or W/O External Gearbox Centrifugal – Integral Gear (Axial Meas.) Centrifugal – Integral Gear (Radial Meas.) BLOWERS (FANS) Lobe-Type Rotary Belt-Driven Blowers General Direct Drive Fans (with Coupling) Primary Air Fans Large Forced Draft Fans Large Induced Draft Fans Shaft-Mounted Integral Fan (Extended Motor Shaft) Vane-Axial Fans MOTOR/GENERATOR SETS Belt-Driven Direct Coupled CHILLERS Reciprocating Centrifugal (Open-Air) – Motor & Comp. Separate Centrifugal (Hermetic) – Motor & Impellers Inside LARGE TURBINE/GENERATOR 3600 RPM Turbine/Generators 1800 RPM Turbine/Generators CENTRIFUGAL PUMPS Vertical Pumps ( 12’ – 20’ Height) Height from Grade to Top Motor Bearing. May be necessary to Vertical Pumps ( 8’ – 12’ Height) Spec. Lower Alarm for Lower Vertical Pumps ( 5’ – 8’ Height) Motor Bearing & for Upper Pump Bearing (depending on height). Vertical Pumps ( 0’ – 5’ Height) General Purpose Horizontal Pump – Direct Coupled Boiler Feed Pumps – Horizontal Orientation Hydraulic Pumps – Horizontal Orientation MACHINE TOOLS Motor Gearbox Input Gearbox Output Spindles: a. Roughing Operations b. Machine Finishing c. Critical Finishing

OK

ALERT

CRITICAL

0 – 6.7 0 – 4.9 0 – 3.6

6.7 – 10.8 4.9 – 7.6 3.6 – 5.4

10.8 7.6 5.4

16.2 11.7 8.1

0 – 5.8 0 – 5.4 0 – 3.6 0 – 3.6 0 – 2.7

5.8 – 9.0 5.4 – 8.1 3.6 – 5.4 3.6 – 5.4 2.7 – 4.5

9.0 8.1 5.4 5.4 4.5

13.5 11.7 8.1 8.1 6.7

0 – 5.4 0 – 4.9 0 – 4.5 0 – 4.5 0 – 3.6 0 – 3.1 0 – 3.1 0 – 2.7

5.4 – 8.1 4.9 – 7.6 4.5 – 6.7 4.5 – 6.7 3.6 – 5.4 3.1 – 4.9 3.1 – 4.9 2.7 – 4.5

8.1 7.6 6.7 6.7 5.4 4.9 4.9 4.5

12.1 11.7 9.9 9.9 8.1 7.2 7.2 6.7

0 – 4.9 0 – 3.6

4.9 – 7.6 3.6 – 5.4

7.6 5.4

12.1 8.1

0 – 4.5 0 – 3.6 0 – 2.7

4.5 – 7.2 3.6 – 5.4 2.7 – 4.0

7.2 5.4 4.0

10.8 8.1 6.3

0 – 3.1 0 – 2.7

3.1 – 4.9 2.7 – 4.0

4.9 4.0

7.2 6.3

0 – 5.8 0 – 4.9 0 – 4.0 0 – 3.6 0 – 3.6 0 – 3.6 0 – 2.2

5.8 – 9.0 4.9 – 7.6 4.0 – 6.3 3.6 – 5.4 3.6 – 5.4 3.6 – 5.4 2.2 – 3.6

9.0 7.6 6.3 5.4 5.4 5.4 3.6

13.5 11.7 9.4 8.1 8.1 8.1 5.4

0 – 1.8 0 – 2.7 0 – 1.6

1.8 – 3.1 2.7 – 4.0 1.6 – 2.7

3.1 4.0 2.7

4.5 6.3 4.0

0 – 1.2 0 – 0.7 0 – 0.4

1.2 – 1.8 0.7 – 1.1 0.4 – 0.7

1.8 1.1 0.7

2.7 1.6 1.1

*NOTE: The “ALERT” and “CRITICAL” overall levels given above apply only to in-service machinery which has been operating for some time after initial installation and/or overhaul. They do not apply (and are not meant to serve as ) Acceptance Criteria for either new or rebuilt machinery.

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