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8. Examples of installation of the gauging system
8.1 General
The gauging system consists of the HERMetic instrument and
the associated HERMetic valve. Two types of connector can be
provided as shown on Figure 8-1.
The following sections, respectively 8.2, 8.3 for connector Q2
and 8.4, 8.5 for connector Q1, describe 2 examples for installing
the valves and adjusting the height of the gauging system.
The valves should be installed in such a way that the
zero-ullage level coincides with the reading index level, so
that no correction would be necessary. For achieving this it
may be necessary to install an adjusting pipe between the
deck and the valve.
If the valves are installed directly on deck or if for any reason
the level of the reading index is below or above the zero-ullage
level, then a correction table should be used.
There should be no internal tank structure between the valve
outlet and the tank bottom such that will impede the path of
the equipment into the tank.
All valves shall be installed at the same level.
Small systematic level error can be corrected by adjusting the
reading index accordingly.
When designing the gauging port and to avoid damaging the
tape during rewinding it is advised to chamfer or to grind all
sharp edges (on pipes, anges, etc.) that could damage the
tape when operating the gauge.
CONNECTORS
Q1 (1”) Q2 (2”)
Figure 8-1
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