Float system, high pressure

High-Pressure Water Jet Systems. High-pressure water jet systems employ spray nozzles set above the water surface on floating rafts or other structures. The nozzles are positioned so that they spray in an overlapping, fan-shaped pattern across the surface of the water. They are directed downward at an angle to create a countercurrent to the water movement. Water pressure to the nozzles must be maintained for the duration of the confinement operation or until other methods are employed. With sufficient water pressure, confinement can be accomplished at current speeds greater than 1.0 mph. 

On a single-evaporator flooded system, a float valve can be fitted which will pass any drained liquid from the condenser direct to the evaporator. The action is the same as that of a steam trap. The float chamber is at condenser pressure and the control is termed a high-pressure float (Figure 8.3). 

By putting the system into a high pressure bomb (36) the magnetic system can be used to measure the densities of aqueous solutions over a wide pressure range with a precision of 11 ppm. We presently are developing a magnetic float system that can be used to measure the densities at low pressures to high temperatures (200°C). 

C. High-Pressure PVT Properties. Three methods are presently being used to measure the high-pressure PVT properties of electrolyte solutions volumetric methods, (26,32,106) high pressure magnetic float systems, (36,107,108) and high pressure speed of sound systems (109,110,111,112). I will not attempt to review all the modifications made to these systems. 

The major difficulties we have had with the high pressure magnetic system is that the floats easily break due to pressure shocks. This greatly disturbs one who has spent many hours calibrating the float in water at various pressures. 

Fig. 8.136 Schematic diagram of a hydraulic pressurization system for the floating roller of a high pressure roller press (see Section 13.3 [102]).

Fig. 10.17 is the typical operational diagram of the hydraulic pressurizing system for the floating roller of a high-pressure roller press (Fig. 10.18). When an empty hydraulic system is being fdled with hydraulic fluid beginning at time marker (0), the pressure in the system increases until it reaches the gas pressure in the accumu-lator(s) (A) at time marker (1). The accumulator(s) is (are) normally pressurized prior to system start-up by filling the accumulator(s) with an inert gas, typically nitrogen. Since,...

FIGURE 24.12 In order to prevent electrolysis products from entering the capillary at the connection of the capillary to high-pressure counter flow system, metal surfaces must he floating and isolated from the path of the electrophoretic current. (Reprinted from Henley, W. H., PhD Dissertation, University of North Carolina, Chapel Hill, 2005. Copyright 2005. With permission.)... 

The high pressure cell (1) located in an electric furnace (2) contains a hollow cylindrical float made in steel. This float is suspended of a nichrone wire which passes through coils fixed to the upper cylindrical cap. The cylinder is connected to two intermediate vessels (3) which avoids direct contact of the sample with the oil of the press (9) and receive the solution displaced from the cell upon heating. The vessels are half-filled with mercury, above which the sample is present in the left-hand vessel and the oil in the right-hand one. The later contains a movable contact (4) to check that mercury has not been ejected into the oil system. The system... 

We developed an experimental procedure that can be applied to highly viscous polymer blends. In the DSM micro-extruder [6], polymers are blended in the melt, at the desired temperature and pressure, and injected into a small capillary tube which is immediately sealed with a floating plug. This capillary cell is placed in a small window autoclave and a laser beam enters the capillary cell at the lens-shaped bottom end. The intensity of the light scattered by the polymer system is recorded at two scattering angles (as a function of pressure and temperature). 

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