Download Motion Control in Offshore and Dredging by P. Albers PDF

By P. Albers

Motion regulate reveals functions in lots of offshore, subsea and dredging installations. movement regulate is usually in accordance with a mixture of mechanical-, electric- and hydraulic force structures including regulate recommendations. The e-book presents the elemental concept of hydraulic controls, behaviour of hydraulic fluids, hydraulic part services, parameter choices, calculation of uncomplicated hydraulic platforms and uncomplicated concept of electric drives: asynchronous cars with frequency drives. except the theoretical history at the force ideas, many new sensible functions are given at the layout of force and regulate thoughts for the offshore and dredging undefined, for instance, the layout of the observed that needed to reduce the nostril from the Russian submarine "Kursk" prior to it may be salvaged from the seabed. unique recognition is given to the static and dynamic behaviour of hydraulically and electrically pushed structures, the behaviour of suggestions regulate platforms with the remainder dynamics and accuracies that may be bought. Many examples are given of put in drives for offshore functions, pipe tensioners, pipe dealing with apparatus, pipe-lay towers. certain details is gifted on lively and passive heave compensators for cranes, deep sea installations, entry structures suction dredgers and the layout of excessive strain fuel apparatus in those systems.

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Extra resources for Motion Control in Offshore and Dredging

Sample text

The setting of this relief valve should be at a value of 130% of the maximum induced pressure pL. If a pressure is applied at the annular end port two effects will be noticed. At first the pressure at the bottom area will increase due to the force balance on the cylinder piston. The second effect is that the counterbalance valve is gradually opened by this pressure at the annular end via the pilot pressure line. 5. 2) From both equations we find that the pressure pC2 and the pilot pressure ppilot are sensitive for back pressure of the valve pV2.

In this chapter we will discuss the most important basic functions of the functional valves that are applied for this purpose. Detailed information about the valves is available from the often very detailed specification and documentation of the different manufacturers. P. V. 2010 Motion Control in Offshore and Dredging Pressure control valves A pressure relief valve must limit the system pressure in a hydraulic installation to a maximum value. If the system pressure exceeds this value, then the pressure relief valve opens and lets oil flow from the pressurized inlet side to the return line.

This is than achieved by venting the chamber of the main relief mechanical spring. Motion Control in Offshore and Dredging With directional valves it is possible to regulate the start, stop and direction of the fluid flow. There are two construction groups, identical to the basic types of pressure regulator valves: • Seating valves, which are more or less leak free. The necessary force required for switching is large because the valve has to be opened against the pressure in the spring. • Spool valves, where a spool is controlled in different positions by springs and hydraulic pressure.

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