Ballast Water Sampling and Sample Analysis for Compliance Control - Global Maritime Transport and Ballast Water Management: Issues and Solutions - page 183

Table 3 Possible sampling access points, equipment and other details recommended for indicative
compliance control in-tank sampling with the D-2 standard (David 2013 )
Organism
group

Water volume
[litre] Sampling point Equipment Number of samples

>50 ʼ m Manhole Plankton net 300-500 1 integrated sample from

possibly the whole water
column

Manhole, sounding
pipe or air vent

Pump 100 1 integrated sample from

possibly the whole water
column or from 3
different depths

<50 and
>10

Manhole, sounding
pipe or air vent

Pump or water
column sampler

5-6 1 integrated sample from

possibly the whole water
column or from 3
different depths

ʼ m

Manhole, sounding
pipe or air vent

Pump or
point-source
sampler

5-6 1 integrated sample from

3 different depths

Indicator
microbes

Manhole, sounding
pipe or air vent

Pump or water
column sampler

1 1 integrated sample from

possibly the whole water
column

Manhole, sounding
pipe or air vent

Pump or
point-source
sampler

1 1 integrated sample from

3 different depths

manholes delivered more diverse samples compared to net samples. Therefore
pumps may also be considered for manhole sampling. As a result, future indicative
compliance control in-tank studies should note that sampling via sounding pipes is
inferior when selecting appropriate sampling techniques. However, in many occa-
sions manholes cannot be opened for sampling due to, e.g., overlaying cargo or
on-going cargo operations in the area where the manhole is located. In these
instances sounding pipe sampling might be the only solution to sampling.
The suggested in-tank sampling methods and equipment are outlined in Table 3 .
For a detailed description of the sampling equipment and sampling arrangements
note section “ Sampling Equipment and Sampling Point Arrangements ”.

Description of Sampling Equipment and Methods for Indicative In-Tank D-2
Sampling

For organisms greater than or equal to 50 m in minimum dimension it is suggested

to use a plankton net because of the ease to fi lter the suggested 300-500 l water
volume. As a second choice a pump may be used to pump up ballast water and to
fi lter 100 l. In case a tank would only be accessible through a sounding or air pipe,
a pump would probably be the only appropriate choice to get a sample for the pur-
pose of D-2 standard compliance sampling.

ʼ