Introduction.- Review of Design Guidelines for Piles in Sand.- Installation Effects on The Capacity of Piles in Sand.- Experimental Facilities to Study the Behavior of Piles.- Instrumented Double-Wall Pipe Pile.- Electro-Pneumatic Pile Hammer for Laboratory Applications.- Geotechnical Properties of the Test Sand.- Similitude Between Model and Full-Scale Piles.- Load Tests on The Double-Wall Pipe Pile in Sand.- Summary, Conclusions, and Recommendations.