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Engine : General Subjects - 903/1128
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Which of the following statements represents the main difference between a stuffing box gland and a mechanical seal for sealing the shaft of a centrifugal pump?
A) Packed stuffing box glands are subject to wear, but mechanical seals are not.
B) Packed stuffing box glands must be cooled by the liquid being pumped, but mechanical seals do not require cooling.
C) If packing fails, the pump can be kept running temporarily by tightening the gland, but if a mechanical seal fails it must be totally renewed to stop the leakage.
D) The sealing surface of a mechanical seal is parallel to the shaft, but the sealing surface of a packed gland is perpendicular to the shaft.
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