Varec, Inc. 25
Tank Roof Entry - Stilling Well
Note To facilitate inspection and service of the gauge system, locate the well where
gauge piping will pass over the top of the tank shell close to a stairway platform.
1. In a user-supplied flange that is suitable to connect to the stilling well on your tank, pro-
vide a center hole for the conduit to screw into the flange.
2. Connect the conduit to the flange.
Note Failure to place the coupling and pipe in a true vertical position may affect the
accuracy of the gauge.
3. After the coupling and pipe are checked to make certain that they are plumb, unscrew the
pipe from the flange.
Note Make sure that the interior of all pipes are clean and corrosion free.
4. Seal the threads with a pipe thread compound and reconnect the pipe to the flange.
Correct Float Positioning for an External Floating
Pan Installation
Note Ensure you have completed all previous steps from your installation checklist
before proceeding.
Note To facilitate inspection and service of the gauge system, locate the well where
gauge piping will pass over the top of the tank shell close to a stairway platform.
Note The total float travel distance must be less than the height of the outboard vertical
pipe. This allows the tape and tape cable splice to reside in the vertical pipe throughout
the total travel of the roof.
1. Determine the position of the center point at which the float will rise and fall (center point
of the floatwell or point on the pan where the cable will attach). Varec recommends this
position is located a minimum of 16 inches (406 mm) and a maximum of 36 inches (916
mm) from the wall of the tank.
2. Extend a vertical line from this point up to the tank roof/position of the support brackets
that will hold the conduit.
Installing Anchors and Guide Wires
Note Ensure you have completed all previous steps from your installation checklist
before proceeding.
1. Center the base of a top cable anchor in its hole. Hold it plumb while welding or bolting it
to the roof.
2. Do the same for the other top cable anchor.
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