CPA Equipment Maintenance & Operations 2

Question 1

When inspecting a pump mechanical seal for leaks, what is the acceptable leak rate for a standard single mechanical seal?

Accepted Answer

Up to 3 drops per minute

Answer

A standard single mechanical seal should leak no more than 3 drops per minute; anything beyond that indicates seal wear or failure.

Question 2

What is the primary purpose of a pressure relief valve (PRV) on a storage tank or vessel?

Accepted Answer

To prevent overpressure by venting excess pressure

Answer

A PRV automatically vents excess pressure to protect the vessel from rupture when pressure exceeds the set point.

Question 3

A centrifugal pump is experiencing cavitation. Which symptom is MOST characteristic of this condition?

Accepted Answer

Rattling or crackling noise from the pump

Answer

Cavitation causes vapor bubbles to form and collapse violently, producing a distinctive rattling or crackling sound like gravel in the pump.

Question 4

Before performing maintenance on a heat exchanger that contains flammable hydrocarbons, which step must be completed FIRST?

Accepted Answer

Purge and blind the equipment

Answer

Purging removes hydrocarbons and blinds (spectacle blinds) isolate the exchanger from the process to prevent exposure to flammable materials.

Question 5

What does the term 'MAWP' stand for in the context of pressure vessel maintenance?

Accepted Answer

Maximum Allowable Working Pressure

Answer

MAWP stands for Maximum Allowable Working Pressure, which is the highest pressure a vessel is designed to handle safely.

(CPA) Certified Petroleum Apprentice Practice Test