Independent vs

Alternative Chocking Methods for Marine Engines

• Metallic chocks require time and manpower for machining the foundation surfaces and engine seating, while epoxy resin chocks do not.
• Resin chocks are made by mixing liquid resin with a hardener to create a chemical reaction that transforms it into a solid form.
• Dams are placed between the bedplate and double bottom to contain the epoxy liquid, and closed cell foam is used to seal the dams.
• Epoxy resin chocks provide a greater support surface for the engine or bedplate, and offer natural protection against engine and hull vibration.
• Epoxy resin chocks should not be used in environments with temperatures above 80°C or ambient temperatures above 60°C.
• The torque or tension required to tighten hold-down bolts for epoxy resin chocks is only a fraction of that required for metallic chocks.
• Self-leveling chocks are height adjustable and re-usable, with a self-leveling top surface that accommodates angular differences between the bedplate and ship structure.
• Height adjustment for self-leveling chocks is achieved by turning the upper ring, and they can be adjusted during the life cycle of the machinery.
• Spring engine mounts are used in instances of high vibration or when the engine must be isolated from the ship's structure.
• Spring engine mounts consist of upper and lower plates separated by one or more springs, with the lower plate bolted to the ship's structure and the upper plate bolted to a supporting frame.
• Alignment of the generator and engine for spring engine mounts is done on the frame using other chocking methods.
• Spring engine mounts are common in ship service diesel installations or diesel electric propulsion systems, especially in icebreakers.