Kistler-Morse KM L-Cell Bolt-On - Manual (Page 41)

Chapter 5. L-Cell Installation on Skirt-Supported Vessels
5-4
Distribution of L-Cells and Junction Boxes Around Vessel
(Aluminum Vessels)
See Figures 5-5 and 5-6. Typical aluminum skirt-supported vessel sizes are shown
in Figure 5-5. L-Cells are placed symmetrically around the vessel, with a maximum
spacing of 4’ (1.2m) between L-Cells. Typically, the tiers are 6.6’ to 8.2’ (2.0 to 2.5m)
high, and the L-Cells are placed at the vertical centerline of the tier.
Note
If the vessel diameter is outside the range shown in Figure 4-2 (9.8’ to 19.7’
[3.0 to 6.0m]) or the tier height is less than 6’ (1.8m), consult KM for
assistance in determining optimal mounting locations.
Figure 5-5. Plan View — L-Cell and Junction Box Locations (Aluminum)
Notes:
1. Distribute L-Cells symmetrically around
vessel using spacing shown as guideline.
2. For diameters not shown, use the sensor
quantity for the next largest diameter (e.g.,
for a 5.5m diameter vessel, use the number
of sensors for a 6.0m diameter vessel, and
distribute symmetrically around vessel).
16’-5” (5.0m) Diameter
3’-8” (1.12m)
L-Cell Spacing
X
X
X
X
X
X
X
19’-8” (6.0m) Diameter
3’-10” (1.18m)
L-Cell Spacing
X
X
X
X
X
X
X
X
16 Sets
(32 L-Cells) 14 Sets
(28 L-Cells)
Legend:
= L-Cell Set
= Junction Box
= Door
X
9’-10” (3.0m) Diameter
3’-10” (1.18m)
L-Cell Spacing
X
X
X
X
8 Sets
(16 L-Cells)
11’-6” (3.5m) Diameter
3’-7” (1.10m)
L-Cell Spacing
X
X
X
X
X
10 Sets
(20 L-Cells)
14’-9” (4.5m) Diameter
3’-10” (1.18m)
L-Cell Spacing
X
X
X
X
X
X
12 Sets
(24 L-Cells)
See Figure 5-7. Place the first L-Cell set at the centerline of the door, or place
one L-Cell at each side of the door.
Example 1: The Application Data Form indicates a 3m diameter aluminum
vessel. The distance from top of door to top of tier is 1.0m.
1. From Figure 5-5, for a 3m diameter vessel, the spacing between sensors is
approximately 1.18m. Locate L-Cell sets at 1.18m spacings around the
vessel, for a total of 16 L-Cells (8 locations x 1 L-Cell set/location x 2
L-Cells/set). From Figure 5-7, center the first set above the door.
2. Locate junction boxes at 4 places, centered between the L-Cell locations.
Each junction box will be wired to 4 adjacent L-Cells.