Direct Contact Type

FIGURE 1A through C Accumulators facilities are called accumulators and are illustrated in Figure 1. A modern accumulator is buffered by a large pressurized gas (mostly air) cushion.

Until about 1960, the direct-contact surface between gas and liquid virtually precluded the use of oil in accumulator installations for larger presses. Gas diffuses into oil under pressure. When oil is discharged from the press at the end of the pressing cycle, the gas begins to bubble out of the liquid; the liquid foams, and because of its large volume, this foam is difficult to handle. This condition exists whether the pneumatic cushion is air or nitrogen. In addition, if air is used as the pneumatic cushion, the oxygen diffused into the oil oxidizes it, producing sludge and gum. (Spring- and weight-loaded accumulator installations have other serious drawbacks and have almost completely disappeared.)

A modification of the accumulator station uses a floating piston to separate oil from the pneumatic cushion (Figure 1C). This design eliminates foaming and oxidizing, thus allowing the inclusion of accumulators into oil systems.

Power plants operated with water are used exclusively in special cases (for instance, where extreme precaution must be taken against fires caused by leaking oil). The increasing viscosity of oil precludes the use of oil at very high pressures.

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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