Page 83 - International safety guide for oil tankers and terminals

HAZARDS OF PETROLEUM

2.7.4 Precautionary Measures
2.7.4.3 Headspace Classificationเท่านั้น---
2.7.4.1 Storage and Handling Temperatures

When carried as fuel, temperatures of the residual fuel oil in the fuel
When filling empty or near empty tanks, the heating coils should be shut์นาวี
system should conform to relevant codes of practice at all times and
excessive local heating should be avoided.

2.7.4.2 Filling and Venting

When tanks are being filled, tank headspace gas will be displaced
through vent pipes. Particular care should be taken to ensure that flame
down and cool. Fuel oil contacting hot, exposed heating coils couldย
screens or traps are in good condition and that there are no ignition
sources in the area immediately surrounding the venting system.
งานห้องสมุด ศูนย์ฝกพาณิช

---ใช้เพื่อการศึกษา
possibly lead to the rapid generation of a flammable atmosphere.

All residual fuel oil tank headspaces should be classified as hazardous
and suitable precautions taken. Electrical equipment within the space
must meet the appropriate safety standards.
ึ
2.7.4.4 Hazard Reduction
The flammability of the headspace of residual fuel oil tanks should be
monitored regularly.

If a measured value in excess of recommended levels is detected (IMO
Resolution A.565(14) refers to a level in excess of 50% LFL), action
should be taken to reduce the vapour concentration by purging the
headspace with low pressure air. Gases should be vented to a safe area
with no ignition sources in the vicinity of the outlet. On completion of
venting, gas concentrations within the tank should continue to be
monitored and further venting undertaken if necessary.

When residual fuel oil is carried as cargo on board tankers fitted with inert
gas, it is recommended that the inert gas is utilised and that the
headspace is maintained in an inert condition (see Section 2.5.4).

2.7.4.5 Ullaging and Sampling

All operations should be conducted such as to take due care to avoid the
hazards associated with static electrical charges (see Section 11.8.2).

2.7.5 Hydrogen Sulphide Hazard in Residual Fuel Oils
Bunker fuels containing high H S concentrations may be supplied without
2
advice being passed to the ship beforehand. Ship’s personnel should always
be alert to the possible presence of H S in bunker fuel and be prepared to
2
take suitable precautions if it is present.

Before loading bunkers, the ship should communicate with the supplier to
S content.
ascertain whether the fuel to be loaded is likely to have any H 2

© ICS/OCIMF/IAPH 2006 49