Fuel tank entry Flashcards
(40 cards)
What is a confined space defined as
An enclosed or partially enclosed space which
1) is at atmospheric pressure during occupancy
2) is not intended or designed primarily as a place of work
3) may have restricted means for entry and exit
4) is liable at any time to
- have an atmosphere which contains potentially harmful levels of contaminant
- have an oxygen deficiency or excess
- cause englufment
entry is defined as
when a persons head or upper body is within the boundary of the confined space
definition of a competent person
a person who through a combination of training, education and experience has squired the knowledge and skills to correctly perform a specified task
Define the LEL
level below which the gas air mixture is too lean to burn
What is the hierarchy of legislation
- Health and safety at work act 2015
- AS/NZS 2865
- NZAP 6000-1, CH 11
when does a duty holder commit the reckless conduct in respect of duty
1) they have a health and safety duty under sections 36-46 of HSWA
2) they engage in behaviour that causes someone to be put at risk of being seriously injured, made seriously ill or killed
3) the person at rish is a person to whom the duty holder owes the health and safety duty
4) the duty holder is reckless about the risk of injury, illness or death
5) they do not have a reasonable excuse
Atmospheric hazards include
- oxygen levels
- flammable/ explosive contaminants
- toxic contaminants
- temperature extremes
other hazards include
- Engulfment/ flooding
- Electric shock
- Fire and explosion
- Noise
- Radiation
- Slips, trips and falls
- manual handling
- Entrapment
- artificial lighting
Atmospheric assessment must include a test for
- unsafe level of oxygen
- flammable or explosive contaminants
- toxic contaminants
What are the 2 types of atmospheric assessment
-atmospheric monitoring:
continuous measurement over an uninterrupted period of time
-Atmospheric testing:
short term testing, recorded at set intervals
what is the safe oxygen range
- 5-23.5
20. 9 is normal
what happens to the body if it is oxygen deprived
impaired judgement and breathing- 16%
unconscious- 12%
death-6%
when can safe entry for avtur occure
5% of LEL, or 350 PPM
The presence of toxic atmospheres may be caused by
- generation by natural process of decomposition
- accidental spillage or leakage
- exhaust gases
- substance contained in the space
in the event of chemical over exposure…
- refer to the relevant MSDS for first aid procedures
- report to medical ASAP with MSDS
RNZAF conditions for safe entry to AC fuel tanks
- combustible vapor concentration within the fuel tanks must be below 350PPM/5%LEL and be continuously monitored
- air supplied respirator must be worn above 29PPM
- oxygen level must be below 23.5%
- air supplied respirator must be worn below 19.5%
- temp must be between 0-40*C
- if contaminants other than AVTUR are present an air supplied respirator must be worn
temperature limits for CSE
temp must be between 0-40*C
vapour concentration x_ for a __*C rise in temp
x2 for a 10*
x4 for a 20*
x8 for a 30*
what is a risk assessment
determination of the level of risk related to a specific situation and a recognised hazard. requires the calculation of the consequence and the liklihood
Hierarchy of control measures
1) elimination
2) substitution
3) isolation
4) engineering controls
5) administrative controls
6) use of ppe
when must an entry permit completed and when does it renew
part A; completed at the commencement of each AC servicing
Part B: issued no more than 1 hr prior to fuel tank entry. renewed when:
- 10 hours have elapsed from the time of issue
- significant change in the risk inside the fuel tank
- significant break in work continuity
where is the entry permit displayed
as close to the entry point as possible
how long must you wait for venting before entering
at least 30min
who is in a fuel tank entry team
NCO IC CSE
fuel tank entrant
stand by person
