Two case studies of comparison of the static load test (SLT) and the rapid load test (RLT) on steel pipe piles (SPPs) are presented and discussed in this paper. The Hybridnamic device, a falling-mass type RLT device, was used in both two cases. In Case study 1, an SPP having an outer diameter of 800 mm and a length of 23.8 m was installed in a weathered rock ground using the down-the-hole hammer method (a percussion drilling method). In the RLTs, three accelerometers were attached to the pile at head, intermediate and tip levels. Unloading Point (ULP) Method was used to interpret the RLT signals. Static load-displacement curves derived from the RLTs using three different accelerations are compared with those from SLTs with the step load method and the continuous load method. An appropriate selection of  is discussed, based on the measured results. In Case study 2, an SPP having an outer diameter of 1000 mm and a length of 15.5 m was installed in a sandstone having SPT N-values greater than 50 using a vibro-hammer together with water jetting. Acceleration at the pile head alone was measured in the RLT. Static load-displacement curve derived from the RLT with ULP was comparable with that obtained from the SLT.