Page 272 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

14.1.12 Testing of Cargo Tanks and Enclosed Spaces on Dry
ื่อการศึกษาเท่านั้น---
Bulk Voyages
Before loading a dry bulk cargo, all spaces that have previously contained
oil should be cleaned, gas freed and inspected internally. Once all tank
should be ventilated with air. If the hydrocarbon gas cannot be controlledย์นาวี
cleaning has been completed, daily checks for hydrocarbon gas should
be made in all empty cargo holds, empty cargo tanks and empty double
bottom and ballast tanks, as well as pumprooms, pipe ducts, cofferdams,
stool tanks and similar void spaces. If no hydrocarbon gas has been
detected after 14 days, the frequency of the readings may be reduced to
every two days, unless the ship passes through areas with higher sea or
air temperatures, in which case the daily checks should continue.

If the following voyage is to continue in dry bulk cargoes, the readings on
that voyage need be taken only every three days.
If hydrocarbon gas is detected during any dry cargo voyage, the space

by ventilation, the space should be inerted and remain so until it can be
cleaned again.

14.1.13 Cargo Changeover Check-Lists

The following check-lists are of a general nature and each ship should
use them as a guide when developing its own comprehensive check-lists.
ึ
Oil to Dry Bulk Cargo
Wash cargo holds and tanks, including access trunks.
Flush all main suctions into cargo holds and tanks and strip dry.
งสมุด ศูนย์ฝกพาณิช
Gas free all cargo holds and tanks.
---ใช้เพ
Hose off, blow through, disconnect and stow portable heating coils as
required. Plug securing sockets as necessary.

Ensure fixed heating coils are free of oil before blanking ends.
Complete hand hosing and digging of holds and sumps to the
requirements of the next cargo.

Drain cargo holds and suction wells.
Blank off main suctions to holds as necessary. Ensure the stripping
discharge line to after hold is securely blanked.
งานห้อ Fit main and stripping suction recess doors as necessary. Also fit
Ensure sounding pipes to bilge wells are open and clear of
obstructions.

heating coil connecting pipe recess doors.
Wash cargo pipeline system thoroughly, including pumps, deck lines,
bottom lines and pumproom.
Ensure gauging system, where fitted, is stowed or blanked as

Drain, vent and prove gas free all gas lines and risers.
Blank off gas lines to holds as necessary.
necessary to manufacturer’s recommendations.
Set venting system to the requirements of the next cargo.
Check hatch cover sealing arrangements and closing devices.

Check ballast tanks, void spaces, cofferdams and pumprooms for
flammable gas. Ventilate as necessary and prove gas free.

238 © ICS/OCIMF/IAPH 2006