|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

LIGHTING AND HEATING

|  | F28 |
HEAT EXCHANGE IN GENERAL

|  | F28 |
Note(s) Apparatus using heat exchange or heat transfer (as defined below) for specific purposes is classified either in sub-class Fulltext... Hierarchy... Expanded...F28B or in the appropriate sub-classes of, for example, classes Fulltext... Hierarchy... Expanded...F22, Fulltext... Hierarchy... Expanded...F24, Fulltext... Hierarchy... Expanded...F25, Fulltext... Hierarchy... Expanded...F26, or Fulltext... Hierarchy... Expanded...F27; if no such other sub-class is appropriate, such apparatus is classified in sub-clas Fulltext... Hierarchy... Expanded...F28C or Fulltext... Hierarchy... Expanded...F28D. In this class, the following terms are used with the meanings indicated: "Heat exchange" means the heating or cooling of a fluid or fluent solid by direct or indirect contact with a heated or cooled fluid or fluent solid. "Heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body.

|  | F28G |
CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OF BOILERS (cleaning pipes or tubes in general Fulltext... Hierarchy... Expanded...B08B; cleaning furnace tubes, cleaning flues or chimneys Fulltext... Hierarchy... Expanded...F23J; removing ice from heat-exchange apparatus Fulltext... Hierarchy... Expanded...F28F 17/00)

|  | F28G 1/00 |
Non-rotary, e.g. reciprocated, appliances (Fulltext... Hierarchy... Expanded...F28G 3/00 takes precedence)

|  | F28G 1/02 |
· | having brushes (brushes Fulltext... Hierarchy... Expanded...A46B)

|  | F28G 1/04 |
· | having articulated tools, e.g. assembled in chain manner

|  | F28G 1/06 |
· | having coiled wire tools, i.e. basket type

|  | F28G 1/08 |
· | having scrapers, hammers, or cutters, e.g. rigidly mounted

|  | F28G 1/10 |
· · | resiliently mounted

|  | F28G 1/12 |
· | Fluid-propelled scrapers, bullets, or like solid bodies

|  | F28G 1/14 |
· | Pull-through rods

|  | F28G 1/16 |
· | using jets of fluid for removing debris (Fulltext... Hierarchy... Expanded...F28G 1/12 takes precedence)

|  | F28G 3/00 |
Rotary appliances

|  | F28G 3/02 |
· | having abrasive tools

|  | F28G 3/04 |
· | having brushes (brushes Fulltext... Hierarchy... Expanded...A46B)

|  | F28G 3/06 |
· | having articulated tools, e.g. assembled in chain manner

|  | F28G 3/08 |
· | having coiled wire tools, i.e. basket type

|  | F28G 3/10 |
· | having scrapers, hammers, or cutters, e.g. rigidly mounted

|  | F28G 3/12 |
· · | resiliently mounted

|  | F28G 3/14 |
· · | thrown into working position by centrifugal force

|  | F28G 3/16 |
· | using jets of fluid for removing debris

|  | F28G 5/00 |
Cleaning by distortion (by vibration Fulltext... Hierarchy... Expanded...F28G 7/00)

|  | F28G 7/00 |
Cleaning by vibration

|  | F28G 9/00 |
Cleaning by flushing or washing, e.g. with chemical solvents (appliances using jets of fluid for removing debris Fulltext... Hierarchy... Expanded...F28G 1/16, Fulltext... Hierarchy... Expanded...F28G 3/16)

|  | F28G 11/00 |
Cleaning by combustion processes, e.g. using squibs, using travelling burners

|  | F28G 13/00 |
Appliances or processes not covered by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F28G 1/00-F28G 11/00; Combinations of appliances or processes covered by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F28G 1/00-F28G 11/00

|  | F28G 15/00 |
Details (measuring thickness of deposit Fulltext... Hierarchy... Expanded...G01B)

|  | F28G 15/02 |
· | Supports for cleaning appliances, e.g. frames

|  | F28G 15/04 |
· | Feeding and driving arrangements, e.g. power operation

|  | F28G 15/06 |
· · | Automatic reversing devices

|  | F28G 15/08 |
· | Locating position of cleaning appliances within conduits

|  | F28G 15/10 |
· | Masks for delimiting area to be cleaned