Preparation For Installation; Overview - JRC JHS-183 Installation Manual

2. Preparation for installation

The purpose of this document is to provide the shipboard installation plans and procedures for the AIS
(JHS-183). It emphasizes the ships that have already been commissioned because these ships require
a higher degree of careful planning.

2.1 Overview

When ships are being commissioned it is important that the shipyard is provided with installation
procedures in a timely manner in order to perform the work quickly and efficiently. On the other hand,
for ships already commissioned it is necessary to prepare a well-thought-out installation plan while
taking into consideration supplementary work and hot work. It is possible to make a tentative
installation and to complete the final work later, but this method is undesirable since much of the work
must be completed twice. Moreover, the classification society and authorities are unlikely to approve
tentative installations.
In terms of shipping schedules and cargo handling a ship usually comes to an anchor for a day or less.
In addition, hot work is prohibited on tankers at the quay and the work should be accomplished after
cleaning the tank. Therefore, it is recommended that the installation work be done during intermediate
or periodical inspections.
In case of existing ships, there is a additional check item to load with AIS (GPS for positional signal,
Gyrocompass for bearing). It is essential equipment for AIS, Furthermore connecting to some sensor is
necessary.
・ GPS Receiver: The GPS Receiver must be operated in the world geodetic system
(WGS-84), whose output signals are Position, speed over ground (SOG), course over
ground (COG), and coordinated universal time (UTC). Some GPS Receiver models do
not generate the necessary signals. Care must be paid in this regard.
(refer to 4.3 List of the GPS receiver to AIS)
・ Gyrocompass: Check that the output signal of the gyrocompass installed in the ship
conforms to the required format (IEC61162-1/-2).
・ Speed log: When a speed log, which generates SOG information, is installed in a ship,
connect the output serial signal to the AIS equipment.
・ Rate-of-turn (ROT) indicator: When a rate-of-turn indicator, which generates ROT
information ($TIROT), is installed in a ship, connect the output serial signal to the AIS
equipment.
In case of existing ships, Necessary works for AIS installation is shown below.
(1) Layout of related units
Plan the layout taking into consideration the installation space and cable routing to units required
for every unit.
•
AIS Transponder
•
AIS Controller (with connection box)
•
Connection Box (optional)
PREPARATION FOR INSTALLATION
2-1