Question 36General Subjects - Assistant Engineer

70% to pass

Which of the following statements represents the proper procedural sequence for adjusting the metering rate of an in-line lubricator as used in a ship's service air system hose station? Assume that the pressure regulator has been properly set.

AEstablish normal air flow. Determine drip rate. Further open needle valve to increase drip rate or further close needle valve to decrease drip rate, as appropriate.
BEstablish normal air flow. Determine drip rate. Further open needle valve to decrease drip rate or further close needle valve to increase drip rate, as appropriate.
CTemporarily shut-off air flow. Determine drip rate. Further open needle valve to increase drip rate or further close needle valve to decrease drip rate, as appropriate. Re-establish normal air flow.
DTemporarily shut-off air flow. Determine drip rate. Further open needle valve to decrease drip rate or further close needle valve to increase drip rate, as appropriate. Re-establish normal air flow.
AI Explanation

The correct answer is A. The proper procedural sequence for adjusting the metering rate of an in-line lubricator is: 1. Establish normal air flow 2. Determine the current drip rate 3. Further open the needle valve to increase the drip rate or further close the needle valve to decrease the drip rate, as appropriate This sequence ensures that the adjustments are made with the system in normal operating conditions, which allows for accurate monitoring and fine-tuning of the lubricator setting. Temporarily shutting off the air flow, as suggested in options C and D, would disrupt the normal operating conditions and make it more difficult to properly adjust the lubricator. The other options (B and D) suggest adjusting the needle valve in the opposite direction to increase or decrease the drip rate, which is incorrect.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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