Page 32 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

Static accumulator oil
An oil with an electrical conductivity of less than 50 picoSiemens/metre (pS/m), so that
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it is capable of retaining a significant electrostatic charge.

Static electricity
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
The electricity produced by movement between dissimilar materials through physical
contact and separation.

Static non-accumulator oil
An oil with an electrical conductivity greater than 50 picoSiemens/metre (pS/m), so that
it is incapable of retaining a significant electrostatic charge.

Stripping
The final operation in draining liquid from a tank or pipeline.

Tank cleaning
The process of removing hydrocarbon vapours, liquid or residue from tanks. Usually
carried out so that tanks can be entered for inspection or Hot Work or to avoid
contamination between grades.

Tanker
A ship designed to carry liquid petroleum cargo in bulk, including a combination carrier
when being used for this purpose.

ึ
Tension winch (automated or self-tensioning mooring system)
A mooring winch fitted with a device that may be set to maintain the tension on a
mooring line automatically.

Terminal
A place where tankers are berthed or moored for the purpose of loading or discharging
petroleum cargo.

Terminal Representative
A person designated by the terminal to take responsibility for an operation or duty.

Threshold Limit Value (TLV)
Airborne concentrations of substances under which it is believed that nearly all workers
may be exposed day after day with no adverse effect. TLVs are advisory exposure
guidelines, not legal standards, and are based on industrial experience and studies.
There are three different types of TLVs:

Time Weighted Average (TLV-TWA) – The airborne concentration of a toxic
substance averaged over an 8 hour period, usually expressed in parts per million
(ppm).
Short Term Exposure Limit (TLV-STEL) – The airborne concentration of a toxic
substance averaged over any 15 minute period, usually expressed in parts per million
(ppm).
Ceiling (TLV-C) – The concentration that should not be exceeded during any part of
the working exposure.

Topping-off
The operation of completing the loading of a tank to a required ullage.

Topping-up
The introduction of inert gas into a tank that is already in the inert condition with the
object of raising the tank pressure to prevent any ingress of air.

xxxii © ICS/OCIMF/IAPH 2006