The Oil and Gas industry has been using cutting edge technologies to increase the production for decades. For the exact same purpose Shell is planning to deploy two multiphase pumps into the Draugen field, located in the Norwegian Sea. A multiphase pump can increase the pressure of a mixture of liquid and gas simultaneously. It is very desirable, since the content of an exploitable reservoir is frequently a mixture of oil and gas. In order to increase the reliability and effciency of such pumps, a multiphase performance model will used to continuously monitor the pump performance during its operation. Unfortunately, a multiphase pump performance model has not yet been developed within Shell Global Solutions. The purpose of this thesis is to investigate the key parameters which influence the pump performance and using this knowledge to create a multiphase performance model.