Page 236 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

settings. The pressure/vacuum valves, deck water seal and filled
liquid breaker must be in good operational condition. All non-return
---ใช้เพื่อการศึกษาเท่านั้น---
devices must be closed to prevent the backflow of inert gas into the
inert gas plant.

d) By a suitable combination of any of these methods.
qualified in accordance with the requirements laid down by the flagิชย์นาวี
Generally, the ullage spaces of all cargo tanks are connected by the inert
gas main line. If the ballasting of dirty tanks can be commenced while
discharge continues from other tanks, judicious adjustments of ballast
and discharge rates can prevent the gas pressure rising sufficiently to
cause a discharge to the atmosphere. Where the ballast rate exceeds the
discharge rate, it may be necessary to reduce or even temporarily stop
the flow of inert gas to the tank system.

งานห้องสมุด ศูนย์ฝกพาณ
11.5.9 Supervision

The person in charge of crude oil washing operations must be suitably

administration of the ship and any port regulations that may be in force
locally.

11.5.10 Cautionary Notice
oil washing systems fitted. The following text is suggested: ึ
A notice should be prominently displayed in the cargo and engine control
rooms, on the bridge and on the notice boards of ships that have crude

THE TANK WASHING LINES ON THIS SHIP MAY CONTAIN
CRUDE OIL.

VALVES MUST NOT BE OPERATED BY UNAUTHORISED
PERSONNEL.

11.6 Ballast Operations

11.6.1 Introduction
This Section addresses routine ballast operations for both segregated
ballast tankers and pre-MARPOL tankers. Additionally, it applies to
tankers with Segregated Ballast Tanks (SBT) when taking extra ballast in
cargo tanks as storm ballast, or to meet air draught restrictions for
navigational purposes.

11.6.2 General

Before ballasting or deballasting in port, the operation should be
discussed and agreed in writing between the Responsible Officer and the
Terminal Representative.

The specific agreement of the Terminal Representative must be obtained
before the simultaneous handling of cargo and non-segregated ballast
takes place.

202 © ICS/OCIMF/IAPH 2006