Hydraulic locking

Normal Hydraulic Locking Piston Drive Fine Motion Electric Motor Drive... 

Spacers are made of alloy steel (52100) or stainless-steel heat treated in atmosphere to a 56-58 Rc. If we look at the ANSI standard which is now 35 + years old, it can easily see why we run into problems when setting up. For example, if we are trying to maintain a 0.001-in. horizontal clearance, and we happen to pick up five spacers that were manufactured to the plus side of the tolerance, we will have accumulated 0.001 in. in that mult. This is why when using standard tooling, our best strip usually is the strip nearest the shoulder. Plastic shims are manufactured to 10% of thickness with a compression of up to 20% with hydraulic lock nuts. A 0.010-in. shim could easily be 0.007 in. at lock up. 

The flexible transfer hose was 300mm (I foot) long and formed part of the transfer line. It was there to provide flexibility because the reactor is on load cells. Anaylsis of the process software identified that high temperature in the receiving vessel tripped the transfer which led the tranter line to be hydraulically locked. The line is both electrically and steam traced to prevent the material solidifying but it had no pressure relief route existed on the line [8J. 

This system includes a pipeline of 20 mm diameter for ball transport located in the reactor vessel bottom and connected to the silo of an internal repository through a hydraulic lock, the outer high-pressure reservoir, and the atmospheric pressure containers for spent fuel storage. 

Other features in the rod drive system are the forward - reverse valve which determines the direction of rod drive check valves which provide an hydraulic lock and prevent depressurization of the cylinder during rod immobility pressure equalizing valves to equalize pressure in both ends of the cylinder after a rod movement to permit rapid reversal of rod direction if desired. Further details on these features is supplied in the detailed analysis and description of the system. 

Case (3) involves a force within the reactor tending to expel the rods. As mentioned in Section 3.2.3.2 of this Appendix, the rod drive cylinders are hydraulically locked when the rods are immobile. In order for Case (3) to be effective, the hydraulic locking system... 

In the absence of a hydraulic lock (from any cause) when the rods are not in motion, a sufficient pressure buildup within the graphite stack in the vicinity of the tip of any rod(s) could force the rod(a) out. By measurement, approximately 100 pounds force on the rod tip is required to overcome drive-system resistance, giving a required stack pressure of about 17 psi. The limiting case would be the concurrent failure of more than ten process tubes pressurizing the entire... 

The best practice is to apply the adhesive into the base of the hole and then assemble the parts (Figure 5.18). Note, however, that in small-diameter holes it is entirely possible that hydraulic locking can occur and so a small bleed hole to allow the air to escape may also be necessary. 

When the discs are of the shrunk-on design, they are made up individually and stacked onto the shaft by first heating the disc to dilate the bore. They are then allowed to cool and thus attach themselves to the shaft. Keys are normally not used. When the discs are of the stacked design, the discs are equipped with rabbet fit to radially lock the discs to maintain concentricity of assembly. The through-bolts are usually tensioned by stretching hydraulically to a precise value to ensure the mechanical integrity of the assembly. 

Christensen-Mason Jar. (See Figure 4-172 and Table 4-103 [57].) This is a combination tool, offering possibility to jar upwards hydraulically and to bump downward mechanically. The jar is equipped with a special releasing (locking) mechanism, so that the jar cannot be fired upwards until the locking system has been released. It has a 6-in. jarring stroke upwards and 30-in. for downward bumping [57]. 

Impellers of multistage pumps shall be individually located along the shaft and positively secured against axial movement in the direction of normal hydraulic thrust. An interference fit is not considered a positive locking method. 

Are impellers for multistage pumps to be positively locked against axial movement in the direction opposite to normal hydraulic thrust Yes No... 

The door is equipped with a hydraulic bolt locking system. 

These control rods thus control the overall reactor power level and provide the principal means of quickly and safely shutting down the reactor. The rods are vertically moved by hydraulically actuated, locking pislou Lype drive mechanisms. The drive mechanisms perform both a positioning and latching function, and a scram function with the latter overriding any other signal (scram signifies prompt shutdown). 

A third cleaning chamber was purchased and installed. This chamber was much larger (8.5 inches diam. x 16 inches deep, 14.9 liter capacity) than either of the other two chambers. It was equipped with an pneumatically operated hydraulic closure and locking mechanism and was equipped with a variable speed magnetic drive. The larger size was necessary so that all components of a system to fill guidance instruments could be cleaned in one SCF cleaning run. 

A screw conveyor takes the comminuted raw material into a coaxial cylindrical chamber. On the left-hand side, this chamber features a reciprocating annular piston actuated hydraulically at a frequency of 120 strokes per minute to form a plug of compressed raw material serving as a pressure lock between the ambient atmosphere and the hydrolysis reactor. Due to its high frequency of operation, this feeder is likened to a machine gun. On the right-hand side, the chamber features a choke applying an adjustable pressure on the plug of raw material, and... 

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