4.1.1 Sampling point location:
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.1 Sampling points shall be so located that relevant
samples can be obtained of the effluent being discharged through outlets
below the waterline which are used for operational discharges.
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.2 Sampling points shall as far as practicable
be located in pipe sections where a turbulent flow is normally encountered.
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.3 Sampling points shall as far as practicable
be arranged in accessible locations in vertical sections of the discharge
piping.
4.1.2 Sampling probes:
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.1 Sampling probes shall be arranged to protrude
into the pipe a distance of about one fourth of the pipe diameter.
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.2 Sampling probes shall be arranged for easy
withdrawal for cleaning.
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.3 The part flow system shall have a stop valve
fitted adjacent to each probe, except that where the probe is mounted
in a cargo line, two stop valves shall be fitted in series, in the
sample line.
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.4 Sampling probes should be of corrosion-resistant
and oil-resistant material, of adequate strength, properly jointed
and supported.
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.5 Sampling probes shall have shape that is not
prone to becoming clogged by particle contaminants and should not
generate high hydrodynamic pressures at the sampling probe tip. Figure 1 is an example of one
suitable shape of a sampling probe.
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.6 Sampling probes shall have the same nominal
bore as the sample piping.
Figure 1 Sampling probe for a part flow display system