Laboratory testing of crevice corrosion properties of stainless steels is performed for different purposes. It may be for qualification testing, ranking of materials or to determine application limits for different services (natural seawater, chlorinated seawater, oil and gas production, -transportation, -processing etc). Aspects around how to perform such testing and how to evaluate laboratory result either for qualification/ranking or for setting application limits with respect to different services are thoroughly discussed. The crevice geometry is affected by several factors. Most important factors are the surface treatment, the gasket material and the torque applied by mounting the crevice assembly. In this work all testing were performed using a recent developed test method simulating the conditions stainless steel are exposed to when a chlorinated seawater system starts up. The test method applied for crevice corrosion testing are described and discussed.