A pre-evacuated container for medical purposes includes an outer body that forms an internal cavity, wherein in a default state the internal cavity is at a vacuum pressure relative to atmosphere, and a fluid interface on the outer body that connects to a drainage tube. A pressure indicator on the outer body is adapted to provide an indication as to a fluid pressure state of the internal cavity. An outlet assembly can be actuated to form an opening between atmosphere and the internal cavity, wherein the outlet assembly can be actuated without damaging the outer body.

A sealing device for an oil tank is mounted between a tank body and a floating roof and includes a fixed bracket, an inner layer plate secured to the fixed bracket, at least one inner spring plate secured on an annular inner diameter of the inner layer plate and applying a force directed toward an outer diameter of the inner layer plate, an outer layer plate arranged on an exterior face of the inner layer plate, with a gap being defined between an interior face of the outer layer plate and the exterior face of the inner layer plate, and at least one outer spring plate arranged in the gap between the outer layer plate and the inner layer plate and applying a force directed toward an outer diameter of the outer layer plate.

A sealing device for an oil tank is mounted between a tank body and a floating roof and includes a fixed bracket, an inner layer plate secured to the fixed bracket, at least one inner spring plate secured on an annular inner diameter of the inner layer plate and applying a force directed toward an outer diameter of the inner layer plate, an outer layer plate arranged on an exterior face of the inner layer plate, with a gap being defined between an interior face of the outer layer plate and the exterior face of the inner layer plate, and at least one outer spring plate arranged in the gap between the outer layer plate and the inner layer plate and applying a force directed toward an outer diameter of the outer layer plate.

A floating roof for an oil tank includes a beam unit and a plurality of float units secured on the beam unit. The beam unit includes a plurality of longitudinal beams and a plurality of transverse beams. Each of the longitudinal beams has an upright wall provided with a plurality of first transverse holes. Each of the transverse beams is located between two of the longitudinal beams and has a bottom plate and two transverse side plates. Each of the two transverse side plates has a second transverse hole. The beam unit further includes a plurality of bolts each extending through one of the first transverse holes and the second transverse hole of each of the transverse side plates, and a plurality of nuts screwed onto the bolts, so that the longitudinal beams and the transverse beams are combined together.

A floating roof for an oil tank includes a beam unit and a plurality of float units secured on the beam unit. The beam unit includes a plurality of longitudinal beams and a plurality of transverse beams. Each of the longitudinal beams has an upright wall provided with a plurality of first transverse holes. Each of the transverse beams is located between two of the longitudinal beams and has a bottom plate and two transverse side plates. Each of the two transverse side plates has a second transverse hole. The beam unit further includes a plurality of bolts each extending through one of the first transverse holes and the second transverse hole of each of the transverse side plates, and a plurality of nuts screwed onto the bolts, so that the longitudinal beams and the transverse beams are combined together.

A pneumatic motor propulsion source including a friction welding apparatus, a gas accumulator tank operably coupled to the friction welding apparatus, and an air compressor operably coupled to the gas accumulator tank.

A pneumatic motor propulsion source including a friction welding apparatus, a gas accumulator tank operably coupled to the friction welding apparatus, and an air compressor operably coupled to the gas accumulator tank.

A storage tank inner wall and floating disc totally enclosed apparatus includes a tank body, floating disc, pressure relief balance structure and a flexible sealing body structure, wherein the floating disc is arranged in the tank body, the edge of the floating disc is provided with an outer frame, the outer frame is provided with a plurality of sealing structures, the top of the inner wall of the tank body is provided with an annular support, one end of the flexible sealing body structure is fixedly connected with the annular support, the other end of the flexible sealing body structure is fixedly connected with the outer frame, one end of the pressure relief balance structure is sequentially and fixedly connected with the flexible sealing body structure and the annular support, and the joint of the annular support is provided with a through hole.

A storage tank inner wall and floating disc totally enclosed apparatus includes a tank body, floating disc, pressure relief balance structure and a flexible sealing body structure, wherein the floating disc is arranged in the tank body, the edge of the floating disc is provided with an outer frame, the outer frame is provided with a plurality of sealing structures, the top of the inner wall of the tank body is provided with an annular support, one end of the flexible sealing body structure is fixedly connected with the annular support, the other end of the flexible sealing body structure is fixedly connected with the outer frame, one end of the pressure relief balance structure is sequentially and fixedly connected with the flexible sealing body structure and the annular support, and the joint of the annular support is provided with a through hole.

Floating roof tank for a volatile liquid have an outer roof and an internal floating roof with a primary seal with a support such that when the tank is empty, the floating roof will rest on the support whether the tank is in a vertical or horizontal position. The support enables the tank to be transported in a horizontal position without damage to the seal. The floating roof tank with support can be configured as a conical tank, flat bottom tank or slant bottom tank. The floating roof tank can also include a cleaning system and a flush mounted manway cover.