Furuno CH-300 Installation Manual page 27

The table below shows tank length and necessary shim thickness. In addition,
the shim thickness shown is for one side. For example, when cutting the 1800
mm tank to 800 mm, the tank inside diameter is 191.25 mm, and shim thickness
is 2.5 mm as shown the table in below.
The table below shows number of shims required and shim thickness.
Shim thickness 0
t2.0
t1.0
t0.5
Inside dia of tank 188.1 188.7
Tank inside dia.
0.5 1 1.5 2
1
1 1
1 1
189.3 189.9 190.5
B (mm)
2.5 3 3.5 4
1 1 1 2
1 1
1 1
191.1 191.7 192.3 192.9
1. MOUNTING
8
7
6
5
4
3
2
1
0
For 1 m tank
For 1.8 m tank
Shim thickness
4.5 5 5.5 6
2 2 2 2
1 1 2
1 1
193.5 194.1 194.7 195.3
1-19
6.5
2
2
1
195.9