CVA Vibration Standards & Safety 4

Question 1

Which API standard covers machinery protection systems, including proximity probes, keyphasors, and vibration monitors?

Accepted Answer

API 670

Answer

API 670 specifies machinery protection systems for vibration, axial position, and temperature monitoring.

Question 2

Per API 670 practice, how should two radial proximity probes at a bearing normally be oriented?

Accepted Answer

90 degrees apart, typically 45 degrees on either side of vertical

Answer

X-Y probes are mounted 90 degrees apart, usually at 45 degrees left and right of top dead center, to capture shaft orbit.

Question 3

What is the standard sensitivity of an API 670 proximity probe system with a typical 8 mm probe?

Accepted Answer

200 mV/mil (7.87 V/mm)

Answer

The standard proximity probe system output is 200 mV/mil, or 7.87 V/mm.

Question 4

Which API standard applies to centrifugal pumps for petroleum, petrochemical, and natural gas industries and includes pump vibration acceptance limits?

Accepted Answer

API 610

Answer

API 610 covers centrifugal pumps and specifies bearing housing vibration limits in the preferred operating region.

Question 5

ISO 7919 (now incorporated into the ISO 20816 series) primarily addresses which type of vibration measurement?

Accepted Answer

Relative shaft vibration measured on rotating shafts

Answer

ISO 7919 provided evaluation criteria for shaft vibration measured on rotating shafts, typically with proximity probes.

CVA - Certified Vibration Analyst Practice Test

CVA - Certified Vibration Analyst Practice Test

CVA Vibration Standards & Safety 4