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GAS-HOLDERS OF VARIABLE CAPACITY (self-acting gas cut-off devices A47J 27/62, G05D; flame traps A62C 4/00; gas mixers B01F, F16K 11/00, G05D 11/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H 7/00, gas compressors F04; valves F16K; damping pulsations in valves or pipes F16K, F16L; pipes F16L; stopping devices for gas mains F16L 55/10; vessels adapted for storing compressed, liquefied, or solidified gases F17C; gas distribution systems F17D 1/04; detecting leakage F17D 5/02, G01M; supervising or alarm devices F17D 5/02, G08B; control of combustion in burners F23N; gas flow or pressure regulators G05D)
Definition statement
This subclass/group covers:

Gas-holders for the storage of compressed, eventually liquefied or solidified gas, with large volume, and whose volume capacity can be changed by special means. Storage of gas is the only purpose of gas-holders.

Warning: This subclass is pending a reorganisation. Documents are continuously reclassified to subclass F17B and deep indexing scheme R17C.

Relationship between large subject matter areas

The fluid contained in the gas-holders according to this subclass should be a gas. It is stored in a gaseous, mostly compressed, or in a liquefied or solidified state of matter in the pressure vessel.

Large vessels that contain other substances than gases are classified in B65D 88/00.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Pressure vessels containing gas
Large vessels not containing gas
Storing fluids in natural or artificial cavities or chambers in the earth
Special rules of classification within this subclass

F17B is merely an inactive field with very few and old documents, and a pending reorganisation will reallocate the documents of this subclass into scheme of R17C, with deep indexing coding. Thus documents are continuously reclassified within subclass F17B and the deep Indexing Codes under R17C.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Gas
Substance that is in gaseous state of matter at normal conditions (atmospheric pressure and normal ambient temperature). Substances that are in a gaseous state of matter but would not be gaseous at normal conditions are not considered in this subclass. Gas can be put in liquid (liquefied gas), or solidified state of matter, for storage.
Gas-holders of variable capacity (large containers in general B65D 88/00; storing fluids in natural or artificial cavities or chambers in the earth B65G 5/00)
Definition statement
This subclass/group covers:

Gas-holders for the storage of compressed, eventually liquefied or solidified gas, with large volume, and whose volume capacity can be changed by special means. Storage of gas is the only purpose of gas-holders.

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Last Modified: 10/11/2013