Engine: General Subjects

1. A Packed stuffing box glands are subject to wear, but mechanical seals are not.
2. B Packed stuffing box glands must be cooled by the liquid being pumped, but mechanical seals do not require cooling.
3. 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.
4. 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.

Tip: press A-D to answer