Hesham
I don't know if I would consider the flow rate of one sprinkler to serve as the basis for the design of a jockey pump. Once a single sprinkler operates, depending on its location and required discharge pressure, the fire pump may be required to satisfy the hydraulic demand. If the building is used as a office, this method would be reasonable. If it is a warehouse protected by ESFR sprinklers I would state that the design is not reasonable.
Remember that a jockey pump is a pressure maintenance pump. Your system remains hydrostatic until a) a sprinkler operates or b) you have a leak upstream of the pump discharge.
I would defer to Travis's wisdom and ensure that the pump has a flow rate of 1% of the pump rating and has the appropriate pressure rating for your system.