Environmental Engineering Reference
In-Depth Information
In-Line D-1 Standard Sampling
Selection of Ballast Water Sampling Equipment and Methods for In-Line
D-1 Standard Sampling
In-line ballast water sampling for the D-1 standard seems unlikely to happen as vessels
without BWMS installed lack in-line sampling points. Nevertheless, in case a sam-
pling point is available somewhere in the line or a tap is available at the ballast
pump, this could be the chosen sampling approach, especially in case when the bal-
last water discharge was already started and is ongoing.
However, D-1 standard sampling may also be used for an early indication of
potentially non-compliant ballast water with the aim to apply appropriate manage-
ment measures, but one key problem remains. This is that compliance or non-
compliance can in this way only be proven while the ballast water is pumped
overboard. Therefore, in cases when a risk assessment identifi es ballast water as of
high risk, in-line sampling during discharge should be avoided, but in-tank sam-
pling should be undertaken for a compliance check (see above).
The suggested sampling method and equipment is described in Table 2 and for a
detailed description of the sampling equipment and sampling arrangements please
refer to section “ Sampling Equipment and Sampling Point Arrangements ”.
As some salinity stratifi cation may occur in the tank, multiple measurements,
e.g., one in the beginning, one in the middle, and one in the end of the discharge,
could identify such differences. However, such a measurement approach could be
impractical especially when ballast water is discharged over longer times. Secondly,
this approach would also be inappropriate in the interest to have the result as soon
as possible before all possibly non-compliant ballast water is discharged from the
vessel.
Description of Sampling Equipment and Methods
for In-Line D-1 Standard Sampling
For in-line D-1 standard compliance tests a small sample bottle is suffi cient. In
cases a conductivity meter will be used, it is recommended to chose sample collec-
tion bottles with a wider opening that the conductivity sensor can be inserted to the
sample right away.
Table 2 In-line sampling equipment and other details recommended for compliance control
sampling with the D-1 standard (David 2013 )
Water
volume
Sampling point
Equipment
Number of samples
In-line
Sampling bottle
ca. 50 ml
1 sample as soon as possible during the discharge
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