Pedestal drills

In the ease where the turbine and supports have a minimal eross seetion, then the ability to inerease the stiffness of these pedestals is minimized. Consequently, the objeetive is to eoneentrate on inereasing the mass of the pedestals. This inerease is aeeomplished by filling the eavities with a speeial mortar prepared with epoxy and steel shot. The density of this speeial mortar ean be in exeess of 300 pounds per eubie foot. To injeet this speeial mortar, a pipe has been installed in the aeeess hole that was drilled in the side of the pedestal near the top. These same teehniques ean be employed to stabilize the foundations under mueh smaller equipment. 

Several homes for liquid fuel may be examined that do not take up valuable deck space. The deck crane pedestals are prime candidates for liquid fuel storage. Temporary storage could be allocated to the oil-gas separators, seawater deaerator tower, and drilling oil-base mud tanks. The jacket conductor has been used in some locations. Unused spare drilling conductors, in conjunction with submersible pumps, may also offer temporary storage. 

Drill guard - provided to protect the operator from contact with the revolving chuck and drill while still retaining visibility of the operation. These guards range from simple acrylic shields to a fully telescopic metal construction with acrylic windows. A typical pedestal drill guard is shown in Fig. 8.3. 

Figure 12.12 Adjustable guard for a rotating shaft, such as a pedestal drill.

Identify four mechanical hazards presented by pedestal drills and outline in each case how injury may occur. 

---