How to solve the deformation of liquid oxygen storage tank?

How to solve the deformation of liquid oxygen storage tank?

The deformation of liquid oxygen storage tanks can generally appear in several forms such as local depression, bulging, integral flat deflation, and integral expansion.

Local depression is a surface depression that occurs in the local area of the liquid oxygen tank shell or head due to the impact or extrusion of external force. Generally, this deformation can only occur on the small liquid oxygen storage tank with thin shell walls. It does not cause the change of the wall thickness of the liquid oxygen storage tank, but only makes a local surface lose its original geometric shape.

The bulge is an outward protruding deformation of a certain part of the pressure surface of the liquid oxygen storage tank due to severe corrosion and the wall thickness is significantly thinned, so it occurs under the action of internal pressure. In some cases, the local temperature of the liquid oxygen storage tank is too high, resulting in the reduction of the mechanical properties of the material, resulting in bulging. This deformation will further reduce the wall thickness of the liquid oxygen storage tank in this area.

The whole flattening is because the wall thickness of the shell subjected to external pressure is too thin, so that it loses its stability under the pressure and loses its original shell shape. This deformation only occurs in the external pressure parts of the liquid oxygen storage tank, such as the inner cylinder of the jacketed liquid oxygen storage tank.

The integral expansion deformation is caused by the yield deformation of the whole liquid oxygen storage tank or some cross sections due to the thin wall thickness or overpressure use of the liquid oxygen storage tank. This deformation is generally slow and can only be detected under special monitoring.

Treatment method

The inspection of deformation can generally be inspected intuitively, and the less serious deformation can be found through the inspection of measuring tools.

The liquid oxygen storage tanks with deformation defects are generally not suitable for continued use except for the local depression that is not too serious. Because the wall thickness of liquid oxygen storage tanks after plastic deformation is always thinned to varying degrees, and the deformation material will also reduce its toughness due to strain hardening, and its corrosion resistance is also poor.