Most of the sliding doors on both sides of the wheelhome are based on the ease of opening and closing, and the reason for not using weathertight doors with ordinary hinges is that the ship has great resistance during navigation, and it is difficult to open the steel doors, especially on the driver's deck. On the offshore platform, the working state is non-sailing state, the wind resistance is not large, and some external doors have fire protection requirements, so the hinged steel doors are mostly used.