Page 135 - Machinery Component Maintenance

118 Machinery Component Maintenance and Repair

Figure 3-33. Three coats of paste wax must be applied to all grout form surfaces coming in
contact with grout.

Up until this point, all the requirements for the grout forms have been
those used for many years. Most API-designed baseplates require two
grout pours, one to fill the void between the concrete and the baseplate
flanges, and the second to fill the void between the baseplate flange to
the top of the baseplate (Figure 3-34). If the free surfaces of the grout at
the baseplate flanges are confined, the 6- to 7-in. higher grout level at the
top of the baseplate can be filled in one pour (Figure 3-35). A wooden-
top form, shown in Figure 3-36, is attached to the sides of the grout
forms and the top of the baseplate flanges . Vent holes (0.3 8-in. diameter)
are drilled in the top form on 18- to 24-in. centers to allow air to escape
as the grout flows from the center of the baseplate to the edges. When the
grout begins to run out of the vent holes, duct tape is used to cover the
holes and the filling operation continues (Figure 3-37). The use of this
method allows a “one pour” grout job, which should be completed in 45
minutes and forms removed 24 hours later. If the temperature at the time
of the pour is above 80°F, the pump and driver can be mounted when the
forms are removed. A “two pour” grout job doubles the labor cost for
grouting and lengthens the completion time of the installation.