Fabricated internal floating roof of aluinium- alloy have changed the conventional method of designing steel internal floating roofs (which look like floating pontoons).

The Operational Principle of 12200 series float type level transmitter and failure in using and repair step is introduced.

The proposed mechanism involves the floats, connecting rods, ratchet wheels and the overdriving clutch.

Welding for included angle in building pontoon;

A new technology is brought forward to overcome tipping by fixing pontoons with optimal size and position at stern in order to increase buoyancy of stern.

In order to utilize rationally the water area of anchorage basin and play full use of deepwater resource, three mooring buoys were installed to form two 125,000 dwt double points mooring berths or three single point mooring anchorages for ship mooring or lighterage operation under favorable sea conditions.

Shooting aim method is employed for solving the dynamical equations of chain system and matched for the computation of buoy motion.

With 1500m water depth we add buoys on the top tensioned riser and assess the effects with different tension ratio and diameter of buoys.

The contour choice of the floats,the location to fix of the floats to the canard aircraft, the theoretic analysis of the main water dynamic characteristics for light seaplane are emphasized,and the new parameter of the centre of gravity of canard configuration airplane to the floats breaking steps is presented.