General information about classification
16
Type approval
To be able to classify an engine, the type of engine
must first be type approved. In such cases, where
Volvo Penta is concerned, an application for type ap-
proval is sent to the Classification Society in ques-
tion, followed by the required drawings, data and cal-
culations.
After certain tests, checks and possible demands for
supplementary information, the engine is type-ap-
proved for a specified maximum power at a given rat-
ed speed. This type approval must not however be
considered as a classification; it is only a certificate
that states that the engine type with specified power
can be classified. Final classification can only be giv-
en when all components are approved and the installa-
tion and test run in the vessel are completed and
found to be in order by the local surveyor.
Procedure for classification
(Product orientated)
To earn a classification certificate, the engine, its
components, the installation and the test run must
be approved by a surveyor from the Classification
Society in question. The surveyor can, after final in-
spection and with certificates from the built-in machin-
ery, issue the final certificate for the vessel. (Thus the
final certificate cannot be issued by AB Volvo Penta).
Usually the procedure is initiated as a result of a re-
quest from a customer or dealer who has to deliver an
engine in a classified installation. For these orders
Volvo Penta normally starts with a “type approved en-
gine”. During production of such an engine the survey-
or checks the production if there is no quality assur-
ance system agreement.
Separate certificates are issued for the following com-
ponents:
Crankshaft, connecting rods,
heat exchanger, oil cooler,
turbocharger, coupling,
reverse gear, propeller and shaft,
generator, alternator.
The surveyor then checks the pressure testing and
test running of the engine, after which a certificate for
the engine itself is issued.
Torsional Vibration Calculations (TVC) must be
carried out for the complete installation of the engine
in the vessel and approved by the Classification Soci-
ety.
These calculations are carried out to check that no
critical torsional vibrations occur in the speed range in
which the engine is operated.
The procedure can differ somewhat depending on the
Classification Society in question.
Simplified rules for engines produced in
series (Process orientated classification)
Most Classification Societies can use simplified clas-
sification procedures based on a well implemented
Quality Assurance System at the Engine Manufactur-
er.
As Volvo Penta fulfills Quality Assurance based on
Swedish standard SS-ISO 9001, AB Volvo Penta has
been approved by the Classification Societies below:
Lloyd’s Register of Shipping (LR)
Registro Italiano Navale (RINA).
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