Question

1. Recommend a planned replacement policy for the following pumps:

Pump no	Age at failure (h)	Failure mode
1	1180	M
2	6320	M
3	1030	I
4	120	M
5	2800	I
6	970	I
7	2150	I
8	700	M
9	640	I
10	1600	I
11	520	M
12	1090	I

I is for impeller failure and M for motor failure, and they are independent.

Answer 1