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CPC Definition - Subclass F28G

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Last Updated Version: 2016.11
F28G
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 place covers:

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

References
Limiting references

This place does not cover:

Cleaning tubes or pipes in general

B08B 9/02

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

C10G 9/12, C10G 9/16

Non-mechanical removal of metallic material from surfaces

C23F

Cleaning metallic materials by chemical methods

C23G

Cleaning engines cooling systems

F01P 11/06

Devices for removing water, salt, or sludge from boilers

F22B 37/48

Cleaning combustion chambers

F23J

Cleaning arrangements for water heaters

F24H 9/00

Removing ice from heat exchanger

F28F 17/00

Preventing the formation of deposits or corrosion

F28F 19/00

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

This place covers:

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

References
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

B08B 9/032

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

B08B 9/055

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

F16L 55/26

Soot-blowers for cleaning furnaces

F23J 3/00

Rotary appliances
Definition statement

This place 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 place covers:

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

References
Limiting references

This place does not cover:

Cleaning by vibration

F28G 7/00

Cleaning by vibration {or pressure waves}
Definition statement

This place 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
Limiting references

This place does not cover:

Cleaning by distortion

F28G 5/00

Informative references

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

Method and apparatus for producing mechanical vibrations

B06B 1/00

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

B08B 7/02

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 place 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
Limiting references

This place does not cover:

Cleaning by using appliances using jets of fluids for removing debris

F28G 1/16, F28G 3/16

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

B08B 9/032

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

C02F 5/08

Cleaning metal pipes by chemical methods

C23G 3/04

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 place covers:

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

References
Limiting references

This place does not cover:

Cleaning by detonations

F28G 7/00

Cleaning by increasing temperature of heat exchange surfaces

F28G 13/00

Appliances or processes not covered by groups F28G 1/00 - F28G 11/00; Combinations of appliances or processes covered by groups F28G 1/00 - F28G 11/00
Definition statement

This place 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 place covers:

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

References
Limiting references

This place does not cover:

Measuring thickness of deposits

G01B