Ammonia In Refrigeration Systems (Work Safe) Flashcards
Liquid ammonia is a clear fluid that _______ quickly at room temperature
evaporates
Ammonia gas is easily ______ under pressure
liquefied
Liquid ammonia has a very high compression ratio. What is it?
1 to 800. 1 litre of ammonia expands to form 800 litres of gas
What effects would 2000ppm of ammonia have?
fatal after a few breaths
what is the maximum allowable ammonia concentration exposure for an averaged eight hour period?
25ppm
When will an ammonia detector usually trip?
35ppm
What is a good method of leak detection?
moisten a strip of indicator paper and hold near suspected leak to see if strip changes colour to pink
Good method for draining chiller oil?
use a length of tube and drain into bucket of water to reduce the amount of ammonia gas released, also wear proper respirators and always have at least two workers present unless there is a shut-off valve (deadman’s switch).
Do not allow the amount of ammonia stored to exceed ___lb or 20% of normal ammonia charge (total amount in system) whichever is less.
300lb
Never allow ammonia cylinders and containers to reach __C
50C
When making repairs on a component in an ammonia system what procedures must be taken?
You must isolate the system so there is not flow of ammonia and thoroughly purge with water or steam to remove all traces of ammonia
Where should emergency controls to shut down the ammonia compressor be located?
outside the machine room
Class T machinery rooms must not contain any permanently installed flame-producing devices or hot surfaces over ____C
427C
Class T machinery rooms wall, floors, and ceiling must be sealed from the rest of the building and must be constructed to have at least _ hour fire resistance rating
1
In class T machinery rooms there must be at least ___ exit door open to the outside of the building
one
In class T machinery rooms there must not be any exterior ________ under or near fire escapes or stairways
openings
Without a direct read out from the ammonia monitor, every leak must be considered ____
IDLH
Eye protection is not mandatory under normal working conditions (__ppm)
25ppm
Workers who are controlling any liquid ammonia leak must have access to full ____ protective suits.
full body
Ammonia reacts instantly with ________
moisture
When ammonia concentrations are shown to be greater than 35ppm, workers must wear a ?
Full face piece respirator with cartridges
Full face piece respirators with canisters or cartridges may be used in ammonia concentrations less than ___ppm
300ppm
What must be worn if ammonia concentrations are greater than 300ppm?
A self contained breathing apparatus (SCBA)
Canisters with an indicator window must be replaced when the material in the window has changed _______
colour
Canisters or cartridges without an indicator window must be ________ after each use
replaced
Workers may wear half face piece respirators with goggles if ammonia vapour concentrations are up to ____ppm. Because ammonia vapour causes immediate eye irritation, workers must always use gas-rated, vapour-tight chemical goggles with a half face piece respirator
250ppm
Self contained breathing apparatuses must be worn when concentrations are ____ppm or more. A worker wearing a SCBA must not enter a contaminated atmosphere until a ______ qualified person is present
300ppm, second
Name the two type of escape respirators;
- bite block respirator
2. half facepiece cartridge respirators
Bite block respirators must be worn with a ____ plug
nose
Anyone entering an ammonia enclosure for any reason must carry an ______ respirator and keep it within arms reach at all times
escape
What must you do for a worker who is working alone?
person-check radio/telephone
Emergency equipment includes eye wash, and shower facilities and _____ ___ kits.
first aid
Do not attempt to neutralize the ammonia burn with other _________
chemicals
Skin contact with liquid ammonia or an ammonia gas stream leaking under high pressure can cause __________
frostbite
Pure liquid ammonia can cause severe _____
burns
Eye contact with liquid ammonia for even a short period can cause permanent disability such as ________. Flushing must begin within __ seconds
blindness, 10 seconds
When flushing eyes you must forcibly hold eyelids open and after flushing has removed all traces of ammonia, cover both eyes with moistened sterile ______ pads and bandage enough to keep light out
gauze
