Levelcom 100 - End Bell and Cleanout Options; Interconnecting Tubing; Figure 8 End Bell and Clean out Examples

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©2013 Technical Marine Service, Inc. LC-100 V2.97
End Bell and Cleanout Options
Figure 8 shows examples of an end bell for
the bottom of the bubbler pipe and a type of
cleanout.
It is possible to decrease the system
sensitivity to leaks by putting a larger
diameter “bell” on the bottom of the bubbler
pipe. Also when the liquid level increases
some liquid will back up into the bubbler pipe.
The bell will minimize the amount of fluid that
will be displaced up the bubbler pipe before
the next LevelCom 100 sample operation.
If the liquid contains suspended solids that can deposit on the tank surfaces there should be
provision made for manual cleaning of the bubbler pipe. In the example shown the tubing
from the LevelCom 100 enters the bubbler pipe through a T fitting. A ball valve in line with
the bubbler pipe allows a cleaning rod to be inserted into the bubbler pipe to remove any built
up material from the liquid. This valve is shut in normal operation. This valve is a potential
source of leaks so this option should only be used where necessary.
Interconnecting Tubing
The tubing connecting the LevelCom 100 with the bubbler pipe can be either plastic or metal.
Copper tubing is very common, stainless steel and plastic tubing also work well. The
material chosen must be compatible with the installation environment.
If the length of the tubing run is greater than 80 feet the tubing should be 3/8 diameter,
otherwise ¼ inch tubing will work. The tubing needs to be properly supported, and protected
from damage. The tubing should not be larger than ½ inch to avoid having too large a
volume of air in the sensing system.
It is also important that the tubing should not have a low spot that can trap liquid. Any liquid
that enters the tubing will accumulate in such a low spot and will cause measurement errors
or false leak indications. If it is necessary to have such a low spot in the tubing then
provision should be made for clean out.
Figure 8 End Bell and Clean Out Examples
END BELL
OPTIONAL
CLEAN-OUT