In this video we will be using Mechanical Power Indicator and the use of Power Card Measurement: This is another mechanical method to measure the performance of engine cylinders by applying indicator drum and plotting graph on cards. Two types of cards are used for this purpose-power card and draw card. With the help of these two diagrams, we can determine the compression pressure, peak pressure and engine power.
In general, the performance of a ship in service is different from that obtained on shipyard sea trial. Apart from any differences due to loading conditions, and for which due correction should be made, these differences arise principally from the weather, fouling and surface deterioration of the hull and propeller. The influence of the weather,
both in terms of wind and sea conditions, is an extremely important factor in ship performance analysis.
Consequently, the weather effects needs to be taken into account if a realistic evaluation is to be made. The primary role of the ship service analysis is a standard of performance data, under varying operational and environmental conditions.
The resulting information, derived from this data, becomes the basis for operational and chartering decision. In addition, the part for the data records is to enable the analysis of trends of either the hull or machinery,
from which the identification of potential failure scenarios and maintenance decisions can be derived. The traditional
method of data collection is the deck and engine room log records, and this is the most commonly used method today.
In terms of data processing and capabilities, this method of data collection is far from ultimate, since involves
significant data distortion risk. Instrumentation errors are always a potential source of concern in performance
analysis methods. Such errors are generally in the form of instrument drift or gross distortion of the reading.
However, these can generally be detected by the use of trend analysis techniques. The procedure for the evaluation of
the ship’s service performance, that relies on proven methods of main propulsion engine service data analysis used
and applied for container vessel small feeder. The vessel is equipped with indirect main propulsion, driven by means
of modern medium speed engine. The different approach demonstrated to achieve the reliable and accurate main
engine performance. The difference in developed engine power has been found, that corresponds well to registered
sea trial results and engine retrofitting reports done, in order to limit the effective power.
11 сен 2024
