SECTION IV
4.0 REQUIRED CONDITION AND RECOMMENDATION FOR SAFE USAGE
The attention of the user of this apparatus is drawn to the possible hazards of ullage, interface and
temperature measurements within flammable liquids, which are also known to be generators of
static electricity.
Adhering to the specific safety directives of your company, is the responsibility of the user.
The following is a general guidance to safe usage, drawn from the advice and experience of
various industry sources.
The specific safety standards or directives of your company are to be strictly adhered to, with the
general guidance given here being regarded as only a supplement to existing and established
operating safety procedures.
4.1
REQUIRED CONDITION
This apparatus must be earthed (grounded) to the liquid tank containment vessel
or tank, before and during introduction into the vessel. The earthed conductor must not
be disconnected until the apparatus is completely withdrawn from the vessel being
gauged. A suitable grounding cable is provided as part of the gauging unit. Proper
grounding of this cable is the responsibility of the user.
4.2
RECOMMENDED SAFE USAGE CONDITIONS FOR THE TRIPLE FUNCTION GAUGING TAPE:
4.2.1 The grounding of the unit, and adhering to the specific company safety
standards or directives, is the sole responsibility of the operator.
4.2.2 Sensor entry into tanks or vessel immediately following a tank filling or
loading operation of known static accumulator type petroleum products or other such
flammable liquids, should
not be attempted until, at least a period of 30 minutes
has elapsed since the cessation of filling.
4.2.3 Clean oil distillates are in general, known to be accumulators of static
electricity due to their low conductivity (I.E., less than 100 Pica Semians/Meter)
and therefore may require relaxation periods of longer than 30 minutes before
gauging is attempted.
4.2.4 The foregoing does not consider the use of anti-static additives to clean
oils, as generally easing the need for proper precaution, unless actual and specific
product testing has shown the product to have conductivity levels which eliminate
the danger of static electric charging.
4.2.5 Sensor entry into tanks or vessels that have been water washed and which
previously contained, or still partially contain petroleum products is not
recommended unless a sounding pipe is provided, and approved for such use, or
at least a period of five hours has elapsed since the completion of the working
operation.
Page 7
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