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Gas Freein Procedures

This document outlines gas freeing procedures to ensure safety. It states that a responsible officer must supervise all operations, personnel must be notified, no smoking rules enforced, and instruments calibrated. It describes ventilation procedures such as controlling exit velocity and isolating tanks. Precautions are listed such as stopping operations if high gas concentrations occur on deck or if winds could cause funnel sparks. Additional safety measures are outlined for gas freeing in port.

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362 views3 pages

Gas Freein Procedures

This document outlines gas freeing procedures to ensure safety. It states that a responsible officer must supervise all operations, personnel must be notified, no smoking rules enforced, and instruments calibrated. It describes ventilation procedures such as controlling exit velocity and isolating tanks. Precautions are listed such as stopping operations if high gas concentrations occur on deck or if winds could cause funnel sparks. Additional safety measures are outlined for gas freeing in port.

Uploaded by

SamarinerSingh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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GAS FREEIN PROCEDURES

A responsible officer must supervise all gas freeing


operations.
All personnel on board should be notified that gas freeing
is about to begin.
Appropriate No Smoking regulations should be enforced.
Instruments to be used for gas measurement should be
calibrated and tested in
accordance with the manufacturers instructions before
starting operations.
Sampling lines should, in all respects, be suitable for use
with, and impervious to, the
gases present.
All openings should be kept closed until actual ventilation
of the individual
compartment is about to commence.
Venting of flammable gas should be by the vessels
approved method. Where gas
freeing involves the escape of gas at deck level or through
hatch openings, the degree
of ventilation and number of openings should be controlled
to produce an exit velocity
sufficient to carry the gas clear of the deck.
Intakes of central air conditioning or mechanical
ventilation systems should be adjusted
to prevent the entry of petroleum gas, if possible, by
recirculation of air within the
spaces.
Window type air conditioning units which are not certified
as safe for use in the
presence of flammable gas, or which draw in air from outside
the superstructure, must
be electrically disconnected and any external vents or
intakes closed.

GAS FREEIN PROCEDURES


Gas vent riser drains should be cleared of water, rust and
sediment, and any steam
smothering connections tested and proven satisfactory.
If the tanks are connected by a common venting system,
each tank should be isolated
to prevent the transfer of gas to or from other tanks.
If petroleum vapours persist on deck in high
concentrations, gas freeing should be
stopped.
If wind conditions cause funnel sparks to fall on deck, gas
freeing should be stopped.
If at any time it is suspected that gas is being drawn into
the accommodation, central
air conditioning and mechanical ventilation systems should
be stopped and the intakes
covered or closed.
When undertaking gas freeing in port the following should be
observed:
As a general rule, gas freeing should not take place
concurrently with cargo handling.
If for any reason this is necessary, there should be close
consultation with, and
agreement by, both the terminal representative and the port
authority.
The terminal representative should be consulted to
ascertain that conditions on the
jetty do not present a hazard and to obtain agreement that
operations can start.
If craft are alongside the tanker, their personnel should
also be notified and their
compliance with all appropriate safety measures should be
checked.
Tank openings within enclosed or partially enclosed
spaces, such as under forecastles

GAS FREEIN PROCEDURES


or in centre castles, should not be opened until the
compartment has been sufficiently
ventilated by means of openings in the tank which are
outside these spaces. When the
gas level within the tank has fallen to 25% of the LFL or less,
openings in enclosed or
partially enclosed spaces may be opened to complete the
ventilation. Such enclosed
or partially enclosed spaces should also be tested for gas
during this subsequent
ventilation.
Additional considerations which apply when tanks have been
inerted are given in Section
7.1.6.12.

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