CCT Installation Procedures 4

Question 1

When installing a vortex flow meter, what installation condition will prevent the meter from producing any output signal?

Accepted Answer

Reynolds number below the meter's minimum detectable threshold

Answer

Vortex meters require a minimum flow velocity (minimum Reynolds number) to generate detectable vortex shedding; below this threshold, output is zero.

Question 2

During installation of a pressure gauge on a steam line, what accessory is installed to protect the bourdon tube from direct contact with high-temperature steam?

Accepted Answer

Siphon (pigtail) or condensate pot

Answer

A siphon or condensate pot fills with condensed water that acts as a thermal buffer, preventing live steam from entering the gauge's bourdon tube.

Question 3

What grounding requirement is critical when installing a Coriolis mass flow meter to prevent measurement interference?

Accepted Answer

The meter flanges must be bonded to the process piping to equalize potential and prevent stray currents through the sensor

Answer

Equalizing potential between the meter and process pipe via bonding prevents stray electrical currents from flowing through the process fluid and disturbing the Coriolis drive or pick-up coils.

Question 4

A technician installs a thermowell by threading it directly into a threaded process connection. What additional step must be verified before committing the installation to service?

Accepted Answer

Verify the thermowell wake frequency calculation (Strouhal number analysis) confirms no resonance with process flow-induced vibration

Answer

Flow-induced vibration can excite a thermowell at its natural frequency, leading to fatigue failure; ASME PTC 19.3 TW wake frequency analysis must confirm adequate safety margin.

Question 5

When installing a differential pressure transmitter below the process taps on a liquid service, which configuration of impulse lines is correct?

Accepted Answer

Slope the lines downward from the taps to the transmitter so liquid drains toward the transmitter and fills the lines completely

Answer

On liquid service with below-tap transmitter mounting, lines sloped downward ensure liquid-filled impulse lines free of gas pockets that would create measurement errors.

(CCT) Certified Calibration Technician Practice Test

(CCT) Certified Calibration Technician Practice Test

CCT Installation Procedures 4