Hatch cover is the cover of the cargo hatch opening on the ship's open deck, which is composed of five parts: cover plate, watertight device, roller device, guide traction device and compression device.
It is usually made of steel to ensure the tightness of the cargo tank opening. The common ones are folding, side opening, lifting, etc
1. Guarantee goods against loss
2. Ensure hull watertight
3. It can resist the pressure of large goods