Overhead cranes

International Standard ISO 8306 (1985) Cranes - overhead travelling cranes and portal bridge. Cranes - tolerances for cranes and tracks. 1st edn 1985-12-15, International Organization for Standardization. 

Collision with other cranes, overhead cables or structures... 

When the furnace is tilted toward the charging floor, which is on a platform above ground level, soHd scrap is dumped by an overhead crane into the mouth of the furnace. Scrap can form up to 30% of the charge unless it is preheated, when up to 45% may be used. The crane then moves away from the furnace and another crane carries a transfer ladle of molten pig iron to the furnace and pours the molten pig iron on top of the scrap. 

Overhead service crane for matrix canister exchange 2 tonne rail mounted 15 tonne gantry 15 tonne gantry... 

Specification tor power driven overhead travelling cranes, semi-goliath and goliath cranes for general use... 

Overhead traveling cranes, hoists, and monorail systems... 

All pipes and fittings are transported to the pickling process in which an overhead crane is used to lower them into an acidic pickle liquor solution that chemically cleans and etches the black oxide surface layer resulting in a clean, rust-resistant pipe. 

Canyon structure for containment of process equipment, which would be installed and replaced remotely by overhead cranes. This arrangement is most cost effective in that it provides for maximum use of building space since there is no need for space between process equipment Failed equipment can be replaced in less than one day and is then moved to separate maintenance shops within the canyon structure for decontamination and repair. 

He should determine what types of equipment need to be serviced by mobile cranes. These pieces of equipment will need to be located on the perimeters of the plant or on a roadway. The roadways along which the crane will travel must have adequate overhead and horizontal clearances. A 12 ft (3.6 m) vertical clearance is necessary.4... 

For the membrane cellroom of the same capacity there are two choices of technology type either monopolar or bipolar electrolysers. In the case of monopolar membrane electrolysers (Fig. 15.9), such as the ICI FM1500, one membrane electrolyser can replace one diaphragm cell. Since the membrane electrolyser has smaller dimensions there is an overall space saving. The monopolar membrane electrolysers may use the same pipework galleries and overhead crane from the... 

Figure 10.17 shows an eight-stage 4-cm contactor. The motors are also face mounted, as discussed by Leonard (1988). There is only one leg between the two four-stage banks of contactors. In later units, one leg has been put at each end of each bank of contactors. This design makes it easier to handle individual banks of four contactor stages. A four-stage 10-cm contactor is shown in Figure 10.18. In this photograph, an overhead crane is lifting one of the motor/rotor assemblies out of the contactor housing.

Samples of South Blackwater and Ensham coal of +16.0 mm size were collected separately, from the stockpiles of the Gladstone Port. Before testing, both types of coals were sieved to obtain a —76.2 + 50.8 mm sized samples for the drop tests. The sample was placed inside the released hopper, which was raised by overhead crane. A sample of 10 kg was dropped each time onto an enclosed horizontal steel plate, conveyor belt and coal stockpile. The dropped coal was sieved to remove the fines (-16.0 mm size). In this way the percentage of fines produced at each drop were determined. The calculation methodology for fines percentage was given in Sahoo et al. [2],... 

Noise protection is needed to protect against RFI/EMI problems caused by mobile and stationary radio, television, and handheld walkie-talkies radio-controlled overhead cranes radar induction heating systems static discharge high-speed power-switching elements high-AC current conductors large solenoids and relays transformers AC and DC motors welders and even... 

Electrolyzers which are connected in series including those of 68 to 70 units are placed on insulators which rest upon concrete stands. An overhead travelling crane transports the electrolyzers to the workshop if the diaphragms or anodes have to be replaced or for any other repairs. 

The process is installed in buildings called canyons, where there are rows of concrete shielded cells serviced by overhead gantry cranes for remote replacement and servicing of valves, pumps, piping, and other equipment. Penetrations through the cell walls are offset to prevent radiation from streaming through. Some equipment is located in cells equipped with windows, TV cameras, and manipulators. Cells for remote repair of the equipment may be similarly equipped. 

Spencer JW, Plisko MJ, Balzer JL. 1999. Asbestos fiber release Ifom the brake pads of overhead industrial cranes. Appl Occup Environ Hyg 14 397-402. 

Economic comparisons and detailed investigations into the cost of operating all these various types of hoists and cranes cannot well be made here, but an analytical consideration of the more complicated type, the overhead cranes, will serve to demonstrate approved methods for arriving at such data. 

Hoisting speeds of overhead cranes are not standardized, but practice has fairly established speed ratios approximately as given in Table 5. Trolley speeds vary from 100 to 150 ft. per minute. Bridge speeds vary from 300 to 500 ft. per minute for small cranes and from 200 to 300 ft. per minute for large cranes. 

Power.—Power requirements of overhead cranes for hoisting, trolley and bridge motors depend upon speed of travel (minimum) and the load lifted (maximum capacity). The power of the motors are thus subject to selection to a certain extent and is governed by the Formulas (5a), (56) and (5c) ... 

Tablit 5.—Hoisting Speeds of Standabd Overhead Electric Cranes... 

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