GB/T 30007-2022 Active National standards

GB/T 30007-2022 Ships and marine technology—Guidelines for the assessment of speed and power performance by analysis of speed trial data

Publish Date: 2022-10-12 Implement Date: 2022-10-12 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 30007-2022

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: The overall structure of the ship

ICS Name: General standards for shipbuilding and marine structures

Publish Date: 2022-10-12

Implement Date: 2022-10-12

Pages: 80 pages

Scope

The main purpose of the speed and power trials is to determine the ship's performance in terms of speed, power, and rotational speed under specified conditions, thereby verifying whether the ship meets the EEDI rules and/or the contractually specified speed requirements.
Considering the relationship between speed, power, and propeller rotation speed, this document defines and stipulates the following steps in preparing, implementing, analyzing, and reporting on ship speed trials:
—— Responsibilities of all parties;
—— Trial preparation;
—— Ship condition;
—— Restricted weather and sea conditions;
—— Trial steps;
—— Trial implementation;
—— Necessary measurements;
—— Data collection and recording;
—— Evaluation and correction steps;
—— Result processing.
The contractual speed and EEDI speed are determined under specific ship conditions and draft (contractual draft and/or EEDI draft). For EEDI, the environmental conditions are: no wind, no waves, no current, and 15°C deep water.
It is impossible to fully achieve the specified conditions during actual trials, so it is necessary to consider adjusting certain environmental conditions, such as water depth, sea surface wind, waves, current, and ship draft. Therefore, during speed and power trials, both shaft power and ship speed are measured, as well as relevant ship data and environmental conditions.
This document is only applicable to displacement ships.
In this document, the unit of angle is expressed in radians (rad), and the unit of speed is expressed in meters per second (m/s), but degrees (°) can also be used as the unit of angle, and knots (kn) can be used as the unit of speed. Therefore, unless otherwise specified, the units of angle and speed in the calculation formulae are all radians (rad) and meters per second (m/s). In addition, for the convenience of users of this document, the values in degrees and knots will also be g