Crane block

Molds can be made from either metallic or nonmetallic materials. Metallic and nonmetallic molds are heated to the same temperature, which can be up to 120°C. Metallic molds are much more heat conductive than molds made from polyurethane or epoxy. When handling the metal molds, clean, heat-resistant gloves must be worn to prevent burning of the skin. The weight of these molds must be taken into account when handling them. Suitable lifting equipment such as a crane, block and tackle, or a forklift must be used. 

There are three types of blocks snatch, wire rope, and crane block. Figure 9.1 shows variations of the snatch block and wire rope block. A typical wire rope block is shown in Figure 9.2. 

FIGURE 9.3 A typical crane block (courtesy of the Bechtel Corporation). 

When testing the limit switch, stand to the side and away from other workers and machines. Push the up button on the pendant control and allow the block to travel. Stop the block several inches from the limit switch. Slowly inch up the block until it touches the limit switch. At that point the crane block should not travel upward. The block can now be lowered. This process should be repeated at the start of each work shift. 

Never lift more than the allowed capacity of the crane. Load limits should be marked on the bridge of the crane. It is also a good idea to identify the capacity on the sides of the crane block. If a two-block crane is being used, each block must be identified for its capacity. 

Never make a side pull. Side pulls are the result of the crane trolley not being directly over the load, or the crane block and hook are attached to a load beyond the perimeter of the crane s access. When side pulls occur, the crane s cable usually winds improperly on the drum, which means the cable can be damaged by the drum s cable grooves. 

A typical block layout for a diesel engine room is given in Figure 15.29, showing the necessary auxiliaries and local control panels. Not shown but also necessary are cranes and fire-protection systems. 

Allcock HR, Reeves SD, Nelson JM, Crane CA, and Manners I. Polyphosphazene block copolymers via the controlled cationic, ambient temperature polymerization of phosphoranimines. Macromolecules, 1997, 30, 2213-2215. 

Crane, J. K., Azar, S. S., Stam, A., and Newburg, D. S. (1994). Oligosaccharides from human milk block binding and activity of the Escherichia coli heat-stable enterotoxin (STa) in T84 intestinal cells. /. Nutr. 124, 2358-2364. 

HT 1 Hole Operation. Special procedure is necessary for operation with the HT 1 hole. The coffin is removed from the dolly by the crane and rolled over 180 on a special fixture. It is then lowered on the dolly with the trunnion riser blocks removed. When the coffin and dolly extensions are bolted on, the coffin is ready for use. 

Electric motors are used to power chain blocks, hoists such as vehicle lifting platforms and large overhead gantry cranes capable of lifting substantial loads. 

Heavy-duty cranes, chain pulley blocks, and portable tripod stands shall be available. 

Regular testing and maintenance of aU pressure vessels and pipelines, fuel storages and gas pipes, electrical overhead travelling (EOT) cranes, hoists and chain pulley blocks, fire fighting equipments, provision of gas detectors for inflammable, and toxic gases are to be carried out as per instructions issued by statutory authorities and inspection personnel deputed by insurance companies. 

While the manipulator inspection pod was accessible at pile cap level the mandatory pre-entry calibrations were made by clamping the test block to the probe chamber at the three positions necessary for comprehensive response checks of the v iole probe eirray. After calibration the manipulator, with the probe assotibly retracted, was lowered by the pile cap crane into the standpipe. Once seated and... 

Address hazards associated with the operation, including 12 specified areas of concern site and ground conditions, blocking material, proper location of blocking, verifying assist crane... 

Cranes and backhoes have a swing radius that can crush or strike someone in that zone. The crane operator needs to block that area off with barricades or tape. Even so, you need to be aware of the swing radius and remember not to enter that zone. 

Even electrode spacing. In Table III, the contact bar system methods of obtaining even electrode spacing are compared. It is expected that insulator blocks, notches and spool shape can provide similarly regular electrode spacing. Where the crane is relied upon to position the electrodes, the spacing reliability will depend upon the degree of automation of the crane and positive placement of the crane bale. 

Triangular Dog-Bone Outotec DoubleContact Notched Freeport McMoRan Spool Insulator block or crane Insulator block or crane Insulator block By notch By notch and insulator block for equalizer bar By spool shape... 

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