Question 402General Subjects - Assistant Engineer

The correct answer is B) 90° apart. When repacking a reciprocating pump with more than four rings of packing, the packing is cut square, installed with the ends abutted, and each succeeding ring staggered with the butted ends 90° apart. This staggered arrangement helps to evenly distribute the pressure and wear on the packing, ensuring a better seal and longer service life of the pump. The other options are incorrect because: A) 45° apart would not provide enough staggering, C) 120° apart would leave some gaps unprotected, and D) 180° apart would defeat the purpose of staggering the packing rings.