Vibration Standards & Safety Flashcards

Which ISO standard defines the training, experience, and examination requirements for certifying vibration analysts in Categories I through IV?

Answer: ISO 18436-2

ISO 18436-2 sets the qualification and assessment requirements for vibration condition monitoring and diagnostics personnel.

According to ISO 18436-2, approximately how much vibration experience is required for Category II certification?

Answer: 18 months

Category II requires about 18 months of cumulative experience, compared with 6 for Category I, 36 for III, and 60 for IV.

Which ISO 1940-1 balance quality grade is typically specified for general machinery such as fans, pumps, and electric motor rotors?

Answer: G6.3

G6.3 is the common grade for general industrial rotors such as pumps, fans, and motors.

Gas and steam turbines, turbo-compressors, and machine-tool drives are typically balanced to which ISO 1940-1 grade?

Answer: G2.5

High-speed precision rotors such as turbines and turbo-compressors are typically balanced to G2.5.

In ISO 1940-1, the balance quality grade G is the product of the specific unbalance (eccentricity) and what?

Answer: Angular velocity

G = e x omega, so the grade is expressed in mm/s.

ISO 1940-1 has been superseded by which standard for rigid-rotor balance quality requirements?

Answer: ISO 21940-11

ISO 21940-11 replaced ISO 1940-1 for balance quality requirements of rotors with rigid behavior.

An analyst must collect data on a motor in a Class I, Division 1 hazardous area. What equipment requirement applies?

Answer: Only intrinsically safe (or suitably certified) instruments may be used

Equipment in hazardous classified locations must be intrinsically safe or otherwise certified to prevent ignition.