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gapingthingsUrban and Civil

Nov 15, 2013 (4 years and 1 month ago)

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PART B

School of Molecular Bioscience.


HAZARDOUS PROCEDURE:
CRYOGENICS


LIQUID NITROGEN

& DRY ICE


Step 3. Assess the risk

Assess the risk for the top priority hazards identified in PART A ie., begin with those rated 1, then 2 etc.

Ref. #

Descript
ion of the hazard or hazardous job

Priority

Identification
Date



1

Dispensing and working with Liquid Nitrogen or Dry Ice (frozen carbon dioxide).
Direct contact with skin or eyes may result in severe burns (frost
-
bite) or permanent
tissue damage and los
s of sight. Serious injury can result within seconds of contact.


5


31/03/2010



2

Transporting, Short Term Storage, and Disposal of Liquid Nitrogen & Dry Ice.
Transporting liquid nitrogen and dry ice between two locations exposes the carrier
and other
persons encountered en route who are not wearing personal protective
equipment to potentially severe cryogenic related injuries. Transport and storage in
small confined spaces (ie lift, car, room etc) may result in asphyxiation. Transport
and storage in
unsuitable containers may result in the vessel exploding.



5




31/03/2010


What makes it hazardous?

Consult with the workers to find out which factors are relevant:


Tick relevant boxes and record observations or comments.



The work environment

Move
ment
between areas (
eg.
between supply area and laboratory) presents a
significant risk of injury to persons encountered en route who are not wearing
personal protection equipment. Enclosed areas such as lift
s and small rooms with
the doors
closed provide
an
environment
where
asphyxiation

(suffocation) is
possible due to rapid release of nitrogen excluding oxygen from the area
.





The nature of the hazard itself

Certain laboratory techniques require the use of cryogenics to prepare samples for
analysis
or storage, and for transportation. Failure to observe safety measures
exposes user, and potentially other colleagues, to significant risk of physical injury,
and
in extreme cases,
unconsciousness, or
death due to asphyxiation.





The individual(s) inv
olved

Requires specific training by authori
s
ed staff in the safe use of the hazardous
cryogenic
materials.





Record the names of those consulted when assessing the risk

Date

Nick Coleman,
Peter Kerr, Joe Dimauro, Jenny Phuyal, Zia Ahmad, Angela Nikolic
, Robert Czolij.

31/03/2010



Step 4. Control the risk(s)

Control the risks(s) by addressing the risk factors found in Step 3.

Consider the
hierarchy of hazard control

and record what controls will be used in the short term and longer term. Record also

who
is responsible for implementing the control(s) and the due by date(s).

Describe the risk control(s)

Who is responsible
for implementation

Due by date

ALWAYS wear personal protective equipment (PPE)

when handling either
liquid nitrogen or dry ice,

inc
luding lab coat, insulating (cryogenic) gloves, and
safety glasses or
preferably
full face shield (
especially
when dispensing liquid
nitrogen from supply cylinder on Level 2 of SMB
in
to dewar)

Individual user and
their supervisor.


21/04/2010

ALWAYS use a
pproved cryogenic vessels, eg metal dewars

for liquid nitrogen
and Styrofoam box
WITH

lid for dry ice
. Using vessels
not intended

for
cryogenic agents risks rupture of the vessel and a S
ERIOUS spill

and injury
.

Individual user and
their supervisor.


21/04/
2010

When dispensing

from liquid N2 cylinder
, e
nsure supply pipe
is
a few inches
in
side

the vessel, not just above it. Slowly turn the supply tap and adjust the
speed of dispensing to prevent splashing. Turn the tap off immediately when it
starts to spl
ash over.
Never leave your dewar unattended.


Individual user and
their supervisor.


21/04/2010

When colle
cting dry ice from another container use an appropriate scooping
instrument or gently tip container to direct the dry ice into your own container.

D
on’t pick up dry ice with bare hands


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21⼰4/2010

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U
se suitable
cryo
-
stable
equipment for
working with
cryogenic agents, such
as: ceramic mortar and pestles, metals containers and instr
ument
s
, and
suitable
plastics.
Glass dewars and other receptacles are hazardous and can
explode if the glass is fractured

(SMB is phasing out glass dewars and
replacing with all
-
metal ones
)
.

Individual user and
their supervisor.



21/04/2010

If dispensing

liquid nitrogen to a
nother
receptacle
pour slowly and carefully to
minimise splashing.


Individual user and
their supervisor.

21/04/2010

Do NOT create a gas
-
tight seal on any vessel containing either liquid nitrogen
or dry. This can result in explosion
and
release of extremely cold vapours
and
/or

liquid
, and sharp fragments of the container
.

Individual user and
their supervisor.

21/04/2010

Proper training of
staff / students is essential prior to use of cryogenic agents.

Supervisor of
researcher / stude
nt

21/04/2010

Development and updating of Standard Operating Procedure (SOP)

SMB Safety
Committee.

21/04/2010

Consult SOP before using cryogenics, and observe all risk control
recommendations.

Individual user and
their supervisor.

21/04/2010


Record the

names of those consulted when deciding on risk control measures

Peter Kerr, Joe Dimauro, Jenny Phuyal, Zia Ahmad, Angela Nikolic, Robert Czolij, Craig Jackson
.

31/03/2010


PART B completed by:

Mr Craig JACKSON

Date:

31/03/2010