BS ISO 03857-4:2012 pdf download

BS ISO 03857-4:2012 pdf download.Compressors, pneumatictools and machines ——Vocabulary —Part 4: Air treatment.
2.6
adsoqtion
physacal process wi which the molecules of a gas, vapour or liquid adhere to the surface of a solid
2.7
aerosol
suspension In a gaseous medium of sohd particles. liquid particles or solid and liquid particles having negligible fall-velocity/setlling-velocity
2.8
aftercooling
removal of heat from the air after cornpressn is complete
agglomerate
group of two or more particles combined, joined or formed into a cluster by any means
2.10
ambient temperature
temperature of the environment surrounding the equipment
2.11
attrition
scouring
scoring
wear caused by rubbing or friction
2.12
breakthrough
moment at which a contaminant is detected downstream of an adsorbent
2.13
brownian motion
random movement of very srnafl particles (less Than
0.2 pm) caused by bombardment of those particles
by gas molecules
Note 1 to entry As a result of this random or spwal movement, the particles describe paths much eater than ther actual size and are, therefore, eesier to trap.
2.14
channel
subset, defined by an upper and a lower limit, of data for the full spectral range of a particle counting instrument in which the particle counts are stored
2.15
coalescing
action of uniting small droplets
2.16
coincidence error
error which occurs because at a given time more than one particle Is contained in the measurement volume of a parlicle counter
Note I to entryThe coincidence error leads to a
measured number concentration which e too low and a
value br the mean perlicle diameter w1iid is too high.
(SOURCE. EN 14799:2007, 3.17)
2.17
colony-forming unit
CFU
unit by which the cutturab4e number te expressed
2.18
condensate
liquid formed in the compressed air
2.19
condensation
process of changing a vapour Into liquid
2.20
contaminant
any solid, liquid, or gas, which adversely affects the system
(SOURCE: ISO 5598:2008, 3.2.124, modifIed — The wording of the definiton has been modified.)
2.21
contamination level
amount ol solid, liquid or gas present in the compressed air
2.22
culturable number
number of micro.organesmns. single cells or aggregates able to form colonies on a solid nutrient medium
2.23
cyclone
device for separating mixed size particles from a gas stream by the use of a vortex
2.24
deliquescence
spontaneous process whereby a soluble solid material absorbs water and becomes liquid
2.25
depth type filtration
filtration accomplished by flowing a fluid through a filter mecum providing a tortuous path to capture the contaminants
2.26
desiccant
substance with the ability to remove water from compressed air
EXAMPtE Silica gel (SiO) or activated alurmna (Ab03).
2.27
desorption
physical process m which the molecules of a gas, vapour or liquid are removed from the surface of a solid
2.28
dew point
temperature at which water vapour begins to condense
(SOURCE: ISO 5598:2008,3.2.1961
2.29
dew point, atmospheric
dew point at atmosphenc pressure
2.30
dew point, pressure
dew point at the specified pressure
2.31
differential pressure
difference in value between two pressures occurring simultaneously at different measurement points
(SOURCE: 1S05598:2008, 3.2.2021
2.32
ditfuson
movement of gas molecules, or small particles. caused by a concentration gradient
2.33
direct interception
collection of relatively large parhcies (1,0 pm and over) on or near the surface of the filter medium
Note 1 to entry The parties hde with the fibres or structure of the filter meum, witheut deviating from streamline flow
2.34
dirt-holding capacity
amount of contaminant a filtration device can holdbefore reaching an operating limit
Note 1 to entryAn example of an operating limit is anallowable pressure dirop.
2.35
dryer
device that lowers absolute moisture content ofcompressed air by reducing water vapour contentand the exit relative humidity is lower than 100 %
Note 1 to entry”Separating” devices that onlyremove bulk water (such as a cyclone separator) are thusnot dryers.
2.36
efficiency
ratio of the particle concentration removed, i.e.upstream concentration minusdownstreamconcentration,totheupstreamparticleconcentration
2.37
entrainment
mist, fog droplets or particles transported by a fluid
2.38
equivalent rated flow
equivalent flow conditions through the filter tomaintain the same velocity at pressures other thanthe reference pressure stated by the manufacturer
2.39
filter
device for the separation of solid,liquid or gaseouscontaminants from a fluid stream
2.40
filtration efficiency
amount of contaminant removed by the filter dividedby the amount of contaminant entering the filter
Note 1 to entrylt isusuallyexpressed as apercentage.
2.41
heat of adsorption
heat released when a substance is adsorbed by an adsorbant.