Kistler-Morse KM L-Cell Bolt-On - Manual (Page 43)

Chapter 5. L-Cell Installation on Skirt-Supported Vessels
5-6
Obstructions typically encountered on a skirt-supported vessel include:
•
pipe, conduit, auger, or other material conveyor passing through a panel
• open hole in a panel
• welded or bolted seams between panels
• bracket or electrical box welded or bolted to a panel
• welds around a patch, plugged opening
Carbon Steel
Obstructions can be classified as major or minor:
•
Figure 5-8 shows an example of a major obstruction. For bolted vessels,
do not place an L-Cell set on a panel with a major obstruction — skip to
the next panel. For welded vessels, do not place an L-Cell set within 4’
(1.2m) of a major obstruction.
• Figure 5-9 shows an example of a minor obstruction. Do not place an
L-Cell set within 2’ (0.6m) of a minor obstruction — less than 4” (102mm)
in size.
See Figure 5-10. Minor obstructions may occur near the top or bottom of a
panel. The effective panel height is the distance between the edge of the panel
and the minor obstruction. If the effective panel height is 6’ (1.8m) or greater,
modify the vertical location of the L-Cell set so the set is at the center of the
effective panel height. If the effective panel height is less than 6’ (1.8m),
relocate the L-Cell set as shown in Figure 5-9.
If adjusting L-Cell locations because of obstructions, maintain the offset
configuration of the set (i.e., if you move one L-Cell in the set from its ideal
location, move the other one as well).
See Figure 5-11. On some vessels, most obstructions occur on the first tier of
panels, while the second tier is largely free of obstructions. If your vessel has
many obstructions on the first tier and meets the requirements shown in
Figure 5-11, consider installing the L-Cells on the second tier.
Obstructions