Textos de Apoio (pdf)

ITTC – Recommended
7.5-04
-01-01.1
Procedures and Guidelines Page 2 of 10
Full Scale Measurements
Speed and Power Trials
Preparation and Conduct of
Speed/Power Trials
Effective Date
2005
Revision
03
Preparation and Conduct of Speed/Power Trials
1. PURPOSE
The general purpose of this procedure is to
define basic requirements for the preparation
and conduct of speed trials.
The primary purpose of speed trials is to
determine ship performance in terms of speed,
power and propeller revolutions under prescribed
ship conditions, and thereby verify the
satisfactory attainment of the contractually
stipulated ship speed.
The applicability of this procedure is limited
to commercial ships of the displacement
type.
The procedure is
• to provide guidelines to document the
trial preparation prior to the conduct of
a full scale Speed/Power trial,
• to define the responsibility sharing
among the parties who take part in the
sea trial for the smooth preparation and
execution of the speed trial
• to establish a guideline for conducting
inspections for the purpose of installing
instrumentation prior to the conduct of
a full scale Speed/Power trial,
• to establish a baseline of the ship hull
and propulsor condition prior to the
conduct of a full-scale Speed/Power
trial;(hull and propulsor surveys are
recommended to allow an evaluation of
the trial results for scientific purposes),
• to install and calibrate trial instrumentation
for full scale Speed/Power trials,
• to define acceptable limits for trial conditions
needed to validate hydrodynamic
design and/or satisfy contractual
requirements,
for acceptable conduct of each speed trial.
2. DEFINITIONS
• Ship Speed is that realized under the contractually
stipulated conditions. Ideal conditions
to which the speed would be corrected
would be
• no wind (or maximum wind speed according
to Beaufort 2)
• no waves (or waves with maximum
wave heights and wave periods according
to Beaufort 1)
• no current
• deep water
• smooth hull and propeller surfaces
• Docking Report: Report that documents
the condition of the ship hull and propulsors
(available from the most recent dry -
docking).
• Trial Agenda: Document outlining the
scope of a particular Speed/Power trial.
This document contains the procedures on