| |
 |
| |
 |
PACKED BED |
|
|
| |
Discrete materials such
as sand, graval, anthracite, fabricated rings or saddles,
assembled in a confined space as filtration medium for
liquids or gases. |
|
PAPER |
|
|
| |
Medium used in many elements.
A very general term applied to resin impregnated cellulose.
Many types of paper or cellulose, made to specification,
are used as a filter medium. |
|
PARALLEL FILTRATION |
|
|
| |
Branching a filtration
setup so that two assemblies of the same pore size are
in parallel, to increase flow rate or simplify filter
changes. |
|
PARTICLE |
|
|
| |
Any discrete unit of material
structure: a discernible mass having an observable length,
width, thickness, size, and shape. |
|
PARTICLE SIZE DISTRIBUTION |
|
|
| |
The size range and quantity
of particles which are measurable in a dry or liquid
sample. Used to determine the appropriate filter media
for a specific process. |
|
PARTICULATE |
|
|
| |
Any solid or liquid material
in the atmosphere. |
|
PART NUMBER |
|
|
| |
A number used to describe
a unique item. Each filter, filter support and accessory
item has its own part number. |
|
PERFORATED |
|
|
| |
Material in which holes
have been punched, such as the material used to make
the center tube of a cartridge. |
|
PERMEATE |
|
|
| |
The product, or filtrate,
of Reverse Osmosis or ultrafiltration. |
|
PH |
|
|
| |
A value of indicating the
acidity or alkalinity of a material. A pH of 7.0 is
neutral, less than 7.0 is acidic, and more than 7.0
is basic. |
|
PLEATED |
|
|
| |
A filter element whose
medium consists of a series of uniform folds and has
the geometric shape of cylinder, cone, disc, plate,
etc. |
|
PLEAT SUPPORT/ SPACERS |
|
|
| |
Used to prevent the collapse
of pleats in a pleated paper or membrane cartridge when
under the action of differential pressure. |
|
PLUGGED |
|
|
| |
The condition of a filter
when it has collected its full capacity of contaminants
and will not pass any more fluid. |
|
PM10 |
|
|
| |
A US EPA standard that
includes additional controls on particulates sized 10
micron and smaller. |
|
PM2.5 |
|
|
| |
A US EPA standard that
includes additional controls on particulates sized 2.5
micron and smaller. |
|
POLYESTER |
|
|
| |
Any of several polymeric
resins formed chiefly by condensing polyhydric alcohol’s
with dibasic acids. Fibers formed |
|
POLYPROPYLENE |
|
|
| |
Polymerized polypropylene
thermoplastic resin used primarily as a coating. |
|
PORE |
|
|
| |
Small interconnecting passage
through a membrane. The size and irregular path of a
pore determines the removal efficiency of a membrane. |
|
PORES |
|
|
| |
A term used to describe
the openings in a filter material normally a membrane.
Small interconnecting passage through the membrane.
The size and irregular path of a pore determines the
removal rating of a membrane. |
|
PORE SIZE |
|
|
| |
The equivalent diameter
of the smallest part of any channel through a membrane. |
|
PORE SIZE-ABSOLUTE RATING |
|
|
| |
The rated pore size of
filter at which particles equal or larger than the rated
pore size are retained with 100% efficiency |
|
PORE SIZE-NOMINAL RATING |
|
|
| |
The pore size at which
a particle of defined size will be retained with efficiency
below 100% (typically 90-98%). Rating methods vary widely
between manufacturers. |
|
POROSITY |
|
|
| |
-The percent of open areas
per unit volume of fabric. -A term used to describe
a filter materials structure - sometimes known as a
void volume. |
|
POTABLE |
|
|
| |
Drinkable (water). |
|
PPM |
|
|
| |
Parts per million. A unit
of concentration; e.g., 3 ppm would be 3 pounds of solids
in 1,000,000 pounds of water. |
|
PRE-COAT |
|
|
| |
A deposit of material (usually
inert), such as filter aid on a septum prior to beginning
filtration. |
|
PRE-FILTER |
|
|
| |
A device installed upstream
of the main filtration process to remove large solids. |
|
PRE-FILTRATION |
|
|
| |
Removal of coarse particles/
contaminants prior to final normally finer filtration. |
|
PRESSURE |
|
|
| |
An increase in the force
exerted on something above standard atmospheric conditions,
measured as gauge pressure (psig, bar g). |
|
PRESSURE, ABSOLUTE |
|
|
| |
Gauge pressure plus 14.7
psi (1 bar). |
|
PRESSURE, ATMOSPHERIC |
|
|
| |
The force exerted by the
atmosphere at sea level which is equivalent to 14.7
psi (1 bar). |
|
PRESSURE DROP |
|
|
| |
A measure of the resistance
the gas stream encounters as it flows through the baghouse.
May refer to pressure differential across the cloth,
across the baghouse, or the pressure drop across the
entire system. |
|
PRESSURE DROP, CLEAN |
|
|
| |
Differential pressure (drop)
across a housing at rated flow on new elements with
clean product. |
|
PRE-TREATMENT |
|
|
| |
The chemical or physical
action of cleaning up a fluid prior to final treatment
or filtration. |
|
PROCESS FILTRATION |
|
|
| |
Filtration used as an active
part of producing finished products. |
|
PSI |
|
|
| |
Pounds per Square Inch;
a unit of pressure; 1 psi equals 27.7” water gauge
or 2.04” mercury (Hg). |
|
PTFE |
|
|
| |
Polytetraflouroethylene.
Highly durable and resistant to a broad range of temperatures
and chemicals. Used to form a heat-bonded, expanded
membrane on filter media to provide high efficiency
among other properties. PTFE is hydrophobic. |
|
PURIFICATION |
|
|
| |
Removal of water of hydrocarbon
in vapor from an air or gas stream. Differs from entrainment
removal in that the dew point of a gas stream will be
lowered by vapor removal. |
|
|
|
