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?

Question

Accepted Answer

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.

Answer

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.

Answer

Packed stuffing box glands are subject to wear, but mechanical seals are not.

Answer

Packed stuffing box glands must be cooled by the liquid being pumped, but mechanical seals do not require cooling.

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