| CPC F04B 53/18 (2013.01) [E21B 43/26 (2013.01); F04B 23/025 (2013.01); F04B 23/06 (2013.01); F04B 53/02 (2013.01); F04B 53/20 (2013.01)] | 15 Claims |

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1. A method of providing lubricant for a frac pump, comprising:
providing a reservoir having a first capacity:
providing a pump assembly including:
a multiple element pump, each element having an inlet and an outlet; and
a manifold for receiving lubricant from the reservoir and supplying the lubricant to the multiple pump element inlets, the manifold having a second capacity;
in which the ratio of the second capacity to the first capacity is between 0.01 and 0.2.
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