Abstract：To improve the overall capability of a mud pump, the stress distributions of a pump body was analyzed, and the pump body structure was improved.The three-dimensional finite element method was adopted to analyze the stress and strain on a 1000 HP mud pump body, under the static analysis condition based on the 1 300 HP mud pump maximum load conditions.The results showed that the pump body structure of stress distribution was uneven.The stress concentration might located at a driven bearing block and a side plate contact position, the screw thread hole of a side plate, and a chamber stud plate.The pump body was improved according to the results of static analysis.Then the finite element analysis is carried out again, until the required strength is obtained.Without the increase of the total volume and total weight, the improved mud pump power was increased from 1 000 HP to 1 300 HP.Thusly, this improvement effectively reduce the cost of a land drilling platform and improve economic benefit.

Keyword：mud pump;pump body;finite element;structural improvement;