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CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS (cleaning pipes or tubes in general B08B 9/02; devices or arrangements for removing water, minerals, or sludge from boilers while the boiler is in operation, or which remain in position while the boiler is in operation, or are specifically adapted to boilers without any other utility F22B 37/48; removal or treatment of combustion products or combustion residues F23J; removing ice from heat-exchange apparatus F28F 17/00)
Definition statement
This subclass covers:

Apparatus and methods for removing deposits from surfaces in contact with heat-exchange media.

References relevant to classification in this subclass
This subclass does not cover:

Cleaning tubes or pipes in general

Removing incrustation in apparatus for thermal non-catalytic cracking of hydrocarbon oils

Non-mechanical removal of metallic material from surfaces

Cleaning metallic materials by chemical methods

Cleaning engines cooling systems

Devices for removing water, salt, or sludge from boilers

Cleaning combustion chambers

Cleaning arrangements for water heaters

Removing ice from heat exchanger

Preventing the formation of deposits or corrosion

Non-rotary, e.g. reciprocated, appliances (F28G 3/00 takes precedence)
Definition statement
This group covers:

Cleaning devices comprising a non-rotary cleaning element, e.g. arranged for linear motion or for back and forth movement.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Cleaning the internal surfaces of tubes by the mechanical action of a moving fluid, e.g. by flushing

The cleaning devices being moved along the pipes by a fluid and conforming to, or being conformable to substantially the same cross-section of the pipes

Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means

Soot-blowers for cleaning furnaces

Rotary appliances
Definition statement
This group covers:

Cleaning devices comprising rotatable cleaning elements, e.g. arranged for turning arount at least one axis; Cleaning devices comprising movable cleaning elements, wherein the movement is a combination of a non-rotary movement and a rotary movement.

Cleaning by distortion (by vibration F28G 7/00)
Definition statement
This group covers:

Cleaning devices performing a cleaning action by deforming the heat exchange surfaces.

References relevant to classification in this group
This group does not cover:

Cleaning by vibration

Cleaning by vibration { or pressure waves}
Definition statement
This group covers:

Cleaning devices performing a cleaning action by producing vibrations on the heat exchange surfaces, e.g. by using knocking devices, or by using pressure pulses, or by producing detonations or explosions.

References relevant to classification in this group
This group does not cover:

Cleaning by distortion

Informative references
Attention is drawn to the following places, which may be of interest for search:

Method and apparatus for producing mechanical vibrations

Cleaning by distortion, beating, or vibration of the surface to be cleaned

Cleaning by flushing or washing, e.g. with chemical solvents (appliances using jets of fluid for removing debris F28G 1/16, F28G 3/16)
Definition statement
This group covers:

Cleaning devices performing a cleaning action by contacting the heat exchange surfaces with a solvent and/or by flowing a washing fluid through the heat exchange conduits.

References relevant to classification in this group
This group does not cover:

Cleaning by using appliances using jets of fluids for removing debris

Informative references
Attention is drawn to the following places, which may be of interest for search:

Cleaning tubes by the mechanical action of a moving fluid, e.g. by flushing

Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents

Cleaning metal pipes by chemical methods

Devices for preventing or removing corrosion, slime or scale from water heaters

F24H19/00

Cleaning by combustion, e.g. using squibs, using travelling burners {(F28G 7/005 takes precedence)}
Definition statement
This group covers:

Cleaning devices, performing a cleaning action by contacting the heat exchange surfaces with flames or high temperature fumes for burning the deposits.

References relevant to classification in this group
This group does not cover:

Cleaning by detonations

Cleaning by increasing temperature of heat exchange surfaces

Appliances or processes not covered by groups F28G 1/00 to F28G 11/00; Combinations of appliances or processes covered by groups F28G 1/00 to F28G 11/00
Definition statement
This group covers:

Other cleaning devices or processes, e.g. cleaning by laser, cleaning by oxidation, cleaning by action of bubbles

Details (measuring thickness of deposit G01B)
Definition statement
This group covers:

Details of cleaning devices, e.g. control arrangements.

References relevant to classification in this group
This group does not cover:

Measuring thickness of deposits

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Last Modified: 10/11/2013