Specifications

PERIODIC MAINTENANCE
54 YM Series Operation Manual
Installing Sample Port
All engines subject to emission standards
shall be equipped with a connection in the
engine exhaust system that is located
downstream of the engine, and before any
point at which the exhaust contacts water
(or any other cooling / scrubbing medium),
for the temporary attachment of gaseous
and / or particulate emissions sampling
equipment.
This connection shall be internally
threaded with standard pipe threads of a
size not larger than 12.7 mm (0.5 in.), and
shall be closed by a pipe plug when not in
use. Equivalent connections are allowed.
The instructions for the proper installation
and location of the required sample port, in
addition to those specified above in the
quoted federal regulation, are as follows:
1. The connection should be located as
far downstream as reasonably
practicable from any sharp bend (of 30
degrees or more) in the exhaust pipe to
help ensure that a well-mixed exhaust
flow sample may be taken;
2. The requirement that the connection be
located before any point at which the
exhaust contacts water (or any other
cooling/scrubbing medium) does not
include contact with water used to cool
exhaust manifolds, unless the water is
allowed to come into direct contact with
the exhaust gases;
3. To allow ready access to the sample
port, the connection should be located,
if possible given the constraints of
vessel design, approximately 0.6 to 1.8
m (2 to 6 ft) above a deck or walkway;
4. To facilitate insertion and withdrawal of
an exhaust sample probe, there should
be no obstructions for at least one and
one-half exhaust pipe/stack diameters
perpendicular, i.e., 90 degrees, from
the sample port; and
5. If a threaded connection is used, both
the internal and external threads should
be coated with a high-temperature,
anti-seize compound before the initial
installation and at every subsequent
re-installation to facilitate removal of
the connection for testing.
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