Question 1 of 20
Q
To prevent over-pressurization when loading liquid petroleum products, cargo tanks must be fitted with a/an __________.
A
pressure-vacuum valve
B
ullage opening
C
over pressurization valve
D
equalizing line
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Question 1 / 205eccef9bbacbc34ba4d453cd
Question 1 of 205eccef9bbacbc34ba4d453cd

To prevent over-pressurization when loading liquid petroleum products, cargo tanks must be fitted with a/an __________.

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Question 1 of 20
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To prevent over-pressurization when loading liquid petroleum products, cargo tanks must be fitted with a/an __________.

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šŸ” Key Concepts

ā€¢ cargo tank venting systems on petroleum tankers ā€¢ purpose of a pressure-vacuum protection device during loading and discharging ā€¢ difference between ullage openings and automatic safety devices

šŸ’­ Think About

ā€¢ When a petroleum cargo tank is being loaded quickly, what happens to the air and vapors already in the tank if they cannot escape freely? ā€¢ Which device is specifically designed to open automatically at a set pressure to protect the tank structure, rather than being a simple access or measurement point? ā€¢ Think about which choice is a standard fitting required by regulations for tank over-pressure/under-pressure protection, not just for gauging or connecting lines.

āœ… Before You Answer

ā€¢ Identify which option is an automatic safety device that responds to both pressure and sometimes vacuum conditions. ā€¢ Eliminate any option that is mainly used for manual gauging or sampling, not continuous over-pressure protection. ā€¢ Confirm which fitting is normally found on the venting system at or near the top of the tank, not inside the piping or cargo line system.

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