Hydraulic lifting equipment

Munitions are placed in slings and manually hung on the linear rack at the top of the inner vessel by workers in personnel protective equipment (PPE) while standing on a hydraulic lift. (In the operations at Kanda Port, Japan, munitions were hung on the rack with a robotic arm that extended into the vessel.)... 

Lifting equipment can be classified according to its power source manual, electrical, pneumatic, hydraulic or petrol or diesel. 

Hydraulic-Lift Trucks. Flydrauhc-Uft trucks (Fig. 4.41) are used for short distance moves at the workplace. They generally range in capacity from 2500 to 8000 lb (1130 to 3625 kg). These trucks require a minimum amount of maintenance, and can last for 20 years. The trucks can be equipped with a jacklike manually operated hydraulic lift or pedal operated system to elevate a loaded pallet. Some units use an electrically driven hydraulic system to lift, often above the maximum 5 in of the manual system. These lift trucks generally use forks for lifting pallets or platforms for special containers and positioning heavy loads. 

Figure 9.18 provides an overview of the application envelope and the respective advantages and disadvantages of the various artificial lift techniques. As can be seen, only a few methods are suited for high rate environments gas lift, ESP s, and hydraulic systems. Beam pumps are generally unsuited to offshore applications because of the bulk of the required surface equipment. Whereas the vast majority of the world s artificially lifted strings are beam pumped, the majority of these are stripper wells producing less than 10 bpd. 

Today, hydraulic power is used to operate many different tools and mechanisms. In a garage, a mechanic raises the end of an automobile with a hydraulic jack. Dentists and barbers use hydraulic power to lift and position their chairs. Hydraulic doorstops keep heavy doors from slamming. Hydraulic brakes have been standard equipment on automobiles since the 1930s. Most automobiles are equipped with automatic transmissions... 

Hydraulic fluids are a very large class of materials that are used in machines and equipment to transfer pressure from one point to another. They are used in many ways including all fluids for car automatic transmissions, brakes, and power steering. Hydraulic fluids are also used in many machines like tractors and other farm equipment, forklift trucks, bulldozers, and other construction equipment, and airplanes. In industry, hydraulic fluids are used in machines that push, lift, pull, turn, and hold things. This profile covers only three of the many types of... 

Fig. 7.45 depicts schematically typical designs of bowl mixers which, with the exception of the bowl shape, feature similar designs as the original Henschel equipment. The shape of the bowl promotes formation of a vortex flow and the mixing tool has minimum clearances to the inner equipment walls for maximum product yield. Often, as shown in the sketches of Fig. 7.45a and b, the impeller can be lifted, sometimes even hydraulically, for improved cleaning. A chopper (or multiple ones) is located such that it extends into the zone of greatest material velocity to perform the same fimctions as described previously. 

Rope maintenance equipment and anchor points complete with hydraulic skip lifting cylinders and chairing provisions... 

Process technicians use hydraulic systems (see Figure 9-6) to open or close valves, lift heavy objects, run hydraulic motors, and stop the rotation of a rotary or reciprocating device. A hydraulic system is a collection of equipment designed to apply pressure on a confined liquid in order to perform work. A similar process is used in the brake systems of most cars and trucks. A hydraulic system is composed of a fluid reservoir, strainer, pump, piping, flow control valve, pressure control valve, four-way directional control valve, and actuator (cylinder, piston). 

Portable Hand-Powered Crane. The portable hand-powered crane is similar in design to a small manual-lift truck, except that the load-carrying forks have been replaced by a boom and hook. This equipment is commonly used to move and position work pieces into and out of process equipment where volumes do not warrant a permanently installed hoisting system. It is also frequently found in maintenance and repair shops to assist in the disassembly and reassembly of in-plant equipment. Lifting is accomplished either through a hand winch and cable system or a manually operated hydraulic system. Typical lifting capacities are limited to 2000 lb (900 kg) or less. 

The vacuum lifting device for the 8.2 m blanks (see Fig. 4.38) is equipped with 18 suction cups, 12 of which are located on an outer circle and the residual six on an inner circle. They are connected to the support structure by hydraulic cylinders so that the above concept is realized. The suction hfter is able to pick up the blanks at their convex side as well as at their concave side. The support structure also carries all components for the vacuum generation, for the hydraulic system, and the complete set of electrical controls. 

The conventional press is hydraulically operated with an independent hydraulically controlled ejection system which lifts the mouldings clear of the tool, enabling the operator, or special take-off equipment, to remove the moulded components without difficulty. 

Operators must also review the rigging to ensure slings and other devices are sufficient to support the load and attach it to the hook. During the lift, safe clearances must be maintained and workers must stay dear of the loads. Periodic inspections of all operating mechanisms, hydraulic lines, hooks, ropes, chains, and related electrical apparatus must be carefully documented. Any damaged or defective equipment must be immediately tagged and removed from service. All repairs and adjustments to this equipment must be performed by well-trained and certified workers. 

Figure 9-9. This hydraulic dock plate is equipped with a safety lip, preventing the lift truck from driving off the edge of the loading dock. (Courtesy of the Rite-Hite Corporation)...

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