Trial
Procedures
Preparations
The
main engines have to be warmed up before starting
a bollard pull trial. In order not to disturb the
water on the trial site, the warming of the engine
and preliminary engine adjustments need to be completed
before bringing the tug into position for the trials.
Requirement
Where the trails are to cover a range of different
propeller revolutions / engine powers, the maximum
bollard pull has to be conducted first, while the
water on the site still is as undisturbed as possible.
Subsequent bollard pull measurements as well as
re-trials should not be carried out directly after
last test, but a period of at least 10 minutes should
be allowed for the water to settle.
The
build-up of water circulation around the tug should
be monitored and must not exceed 0.5 m/s.
