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C

CAKE

Solids deposited on the filter media.

CALIBRATION

A system component that captures heat, smoke and particulate and conducts them into the exhaust ductwork hood.

CAN VELOCITY

In a dust collector with the filter elements suspended from the tubesheet, can velocity is the upward air stream speed calculated at the horizontal cross-sectional plane of the collector housing that passes through the bottom surface of the filters.

Can Velocity = ACFM / area of the tubesheet - (# of bags x area of the bottom of the bag)

CANOPY

An air filtration structure utilizing fabric filter bags for the purpose of removing solid particulate from the gas stream; dust collector.

CAPTURE VELOCITY

The air velocity at any point in front of the hood or at the hood opening necessary to prevent particulate material and contaminant gases from escaping to the working area.

CAUSTIC

A Sodium Hydroxide (NaOH) solution.

CELL (IN WIDTH)

A cell is an arrangement of bus sections parallel to gas flow. Note: Number of cells wide times number of fields deep equals the total number of bus sections.

CELL PLATE (TUBESHEET)

A steel plate or casting to which the open end of the filter bags is connected. Separates the clean air and dirty air plenums of the baghouse.

CENTRIFUGATION

The process of separating two substances of differing densities by high speed spinning to create centrifugal force. Typically used to separate suspended particles from liquid.

CERTIFICATE OF COMPLIANCE

A document confirming that at the time of assessment the product or service met the stated requirements.

CERTIFICATION

The authoritative act of documenting compliance with agreed requirements.

CFM

Cubic Feet per Minute. A unit of measure for volumetric gas flow.

CHAIN STITCH

A stitch in which the loops are connected in a chain-like way, as in crocheting. Used primarily in a continuous sew type of operation such as tubing. Can unravel if the chain is broken.

CHAR

A carbonaceous material in dust usually incompletely burned fuel, which has larger particles than the rest of the dust.

CLARIFICATION

TO clear a liquid by filtration, by the addition of agents to precipitate solids, or by other means.

CLARITY

Clearness of a liquid measured by the amount of contaminants remaining.

CLEAN AIR PLENUM

The baghouse area, through which gases are directed, located on the clean side of the bags above the tubesheet in a pulse-jet baghouse.

CLOTH WEIGHT

Fabric weight expressed in oz/yard².

COATING

Immersion of filter media in a solution to provide the fibers with a coating that will lubricate and thereby reduce self-abrasion.

COLLECTION EFFICIENCY

A measure of dust collector ability to remove particulate from the inlet gas expressed in percent.

COLLECTION SURFACES

The individual elements, which make up the collecting system and provide the total surface area of the precipitator for the deposition of dust particles.

COLLECTION SURFACE AREA

The total flat projected area of collecting surface exposed to the active electrical field (effective length x effective height x 2 x number of gas passages).

COMBINATION FABRIC

A woven fabric containing both filament and spun yarn of the same or different fibers. The filament yarn is normally used length-wise for strength and spun cross-wise to provide surface area.

COMPLIANCE

An indication or judgement that the product or service meets the agreed requirement of the relevant specification; also the state of meeting the requirements.

COMPRESSION BAND

Stainless steel band sewn into the end of the bag to provide a surface to clamp against in the baghouse.

CONICAL HOPPER

A hopper shaped like an inverted pyramid.

CONICAL SPRING

A spring that is tapered from one end to the other.

CONSTRUCTION

Basic design description determines the weave pattern in woven textiles or the composition and manufacturing method in felted media.

CONTROL DAMPER

A device installed in a duct to regulate the gas flow by degree of closure. Examples: butterfly or multi-louver.

CONTROL EQUIPMENT

High voltage power supply control equipment generally consists of electrical components required to protect, monitor and regulate the power supplied to the precipitator high voltage system.

CORD CUFF

A cuff with cord sewn into the top portion of the cuff at the end of the bag. Cord is normally cotton or fiberglass.

CORE YARN

Used in filtration with fiberglass yarn. Spun or texturized yarns are twisted around a filament (core) yarn, adding yarn strength and stability.

CORONIZING

A heat cleaning process for fiberglass fabric to burn off the starches (used in processing) usually at temperatures of 1,000`F. for a short duration.

CORROSION

Chemical attack on metallic surfaces, usually caused by moisture and/or acid dew point excursions.

COUNT OF CLOTH

The number of ends (length-longitudinal yarns) and picks (cross-horizontal yarns) per inch in a woven fabric.

CUFF

A turn back of fabric on itself to form the end of a bag. Normally sewn down to be permanent.

CURRENT DENSITY

The amount of secondary current per unit of ESP collecting surface.

CURING

In finishing fabrics, the process by which resins or plastics are set in or on textile materials, usually by heating.

CUT LINES

Those lines on a pattern along which a cut is made.

CUT-TAPERED BAG

A bag that is cut on a lay table so that one ends is smaller in diameter than the other.

CYCLONE

A conical-shaped vessel for separating mixed sized particulates from the gas stream. The vessel has a tangential entry at the largest diameter allowing the larger particles to drop out and be removed from the bottom of the cone while smaller particulate exits overhead with the majority of the gas stream.