An underground double containment system consists of a concrete outer containment receptacle housing a primary fluid flow pipe, which extends there through and is supported on inverted T-beam structures within the concrete receptacle. The concrete receptacle can be provided with a removable cover providing access to the primary piping in modular sections defined by the boundary of the receptacle and flexible curved tubes opening in the wall of the receptacle through which the primary piping module sections can be removed from the receptacle or held for repair/maintenance.
Double conversion on-line UPS is an electronic device that continues to supply electric power to the load for a certain periods of time during a loss of utility power or when the line voltage varies outside normal limits. Its typical application is computer backup power. It is continuously processing the whole power through series connected AC-DC rectifier / charger and DC-AC inverter.
Double corrugated gaskets are mainly used in heat exchanger applications. The corrugations on the gasket provide an additional labyrinth seal. It also provides the advantage of reducing the contact area of the gasket, enhancing its compressive characteristics. These are sometimes used with a very-light coating of gasket cement or lubricant, which assists in flowing the metal portion of the gasket into the tool marks on the flange seating surface.
Double Crank Press framework is welded with steel plates as an integrated structure with perfect rigidity. Its driving unit is tightly sealed in oil tank. The sliding unit is fully auto lubricated. It is equipped with oil volume and pressure detector switch, which can detect the situation of oil supply.