Production and material requirements planning are interrelated. The number of required material depends on the quantity of products for a certain period. The are some methods for material requirements planning. Two of them are lot-for-lot and economic order quantity. Those two methods will be apllied to impeller requirements planning for centrifugal pumps and evaluated to determine which one is more appropriate for the case being studied. Those methods are chosen because each of them has different characteristic in determination of lot's quantity. In lot-for-lot the determination of quantity of the impeller is based on the requirements for single period. In economic order quantity the determination of quantity of the impeller is based on expected requirements.