Abstract: The jacket pile gripper is a key equipment for the installation of offshore jacket platforms. It is installed on top of the jacket skirt pile sleeve. During operation， the hydraulic cylinder is driven to clamp the steel pile to ensure the relative fixation between the steel pile and the jacket. If the gripper fails during the installation process of the jacket platform， it will seriously affect the entire offshore installation plan and cause huge economic losses. Therefore， in order to ensure the product quality of the gripper， it is necessary to conduct factory testing of key components of the gripper on land， factory testing after final assembly， and system testing after installation on the jacket platform to verify the functional integrity of the pile clamp.

Key words: gripper, testing technology, jacket platform, driving system