Question 146General Subjects - 1st Asst/Chief
70% to passIf item "1" in the illustrated oily-water separator indicates an abnormally deep vacuum, which of the following conditions is the most probable cause? Illustration GS-0153
ACoalescer beds are severely fouled.
BProcess water inlet valve, item "5", is open.
CSuction line inlet strainer is obstructed.
DNo problem exists as a high vacuum should be maintained in the chamber whose vacuum is to be measured.
AI Explanation
The correct answer is C) Suction line inlet strainer is obstructed. An abnormally deep vacuum at the oily-water separator's item "1" indicates that the suction line inlet strainer is likely obstructed. This obstruction creates a higher resistance to the flow, resulting in a deeper vacuum at the inlet. The other options are incorrect because: A) Fouled coalescer beds would create back pressure, not a deeper vacuum; B) An open process water inlet valve would not directly affect the vacuum at the inlet; and D) A high vacuum should not be maintained in the chamber whose vacuum is to be measured, as this could indicate an issue with the system.
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