Why is the discharge pressure of a herringbone gear pump steadier than the discharge pressure of a simple spur gear pump?

Official USCG Answer & Rule Citation

Correct Answer: Option A — One discharge phase begins before the previous discharge phase has been completed.

In USCG Marine Engineering General Subjects, for engine room systems involving 'Why is the discharge pressure of a herringbone gear pump steadier than the discharge pressure of a simple spur gear pump', the standard operating requirement is: 'One discharge phase begins before the previous discharge phase has been completed.'.

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