When installing a mechanical shaft seal on a pump, it is important to ______.

Correct Answer: Option D — ensure that correct spring pressure is applied to the seating faces

Mechanical seals rely on precise spring tension to maintain contact between the stationary and rotating faces. If the spring pressure is incorrect, the seal will either leak excessively or overheat due to friction. Proper installation requires strict adherence to manufacturer specifications regarding spring compression to ensure a reliable, long-lasting seal.