United States Patent and Trademark Office

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Color		Curly Brackets (indicating CPC extensions to IPC)

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	CPC	COOPERATIVE PATENT CLASSIFICATION

F17D

PIPE-LINE SYSTEMS; PIPE-LINES (pumps or compressors F04; fluid dynamics F15D; valves or the like F16K; pipes, laying pipes, supports, joints, branches, repairing, work on the entire line, accessories F16L; steam traps or the like F16T; fluid-pressure electric cables H01B 9/06)

NOTE

In this subclass, pipe-line systems are interpreted as systems described in flow sheets as well as arrangements of co-operating elements, the elements per se being covered in the relevant subclasses.

F17D 1/00

Pipe-line systems (conveying articles or materials through a pipe- line by means of a fluid carrier B65G 51/00, B65G 53/00; liquids B67D; special devices for transferring liquids from bulk storage containers into vehicles or boats or vice versa, e.g. loading or unloading vehicles or portable containers B67D5/00; conveying material which has been excavated by a dredger or soil shifter through a pipe-line E02F 7/10; sewer pipe-line systems E03F 3/00; thermal insulation of pipe-lines F16L 59/00; central heating systems F24D)

F17D 1/005

{

for a two-phase gas-liquid flow

}

F17D 1/02

for gases or vapours

F17D 1/04

. .

for distribution of gas

F17D 1/05

. . .

Preventing freezing (by heating F16L 53/00)

F17D 1/06

. .

for steam

F17D 1/065

. .

Arrangements for producing propulsion of gases or vapours

F17D 1/07

. . .

by compression

F17D 1/075

. . .

by mere expansion from an initial pressure level, e.g. by arrangement of a flow-control valve

F17D 1/08

for liquids or viscous products (water-main or service pipe systems E03B 7/04; domestic hot-water supply systems F24D 17/00)

F17D 1/082

. .

{

for cold fluids, e.g liquified gas (F17D 1/086 takes precedence)

}

F17D 1/084

. .

{

for hot fluids (F17D 1/086 takes precedence)

}

F17D 1/086

. .

{

for explosives

}

F17D 1/088

. .

{

for solids or suspensions of solids in liquids, e.g slurries (F17D 1/086 takes precedence)

}

F17D 1/12

. .

Conveying liquids or viscous products by pressure of another fluid

F17D 1/13

. .

Conveying liquids or viscous products by gravity

F17D 1/14

. .

Conveying liquids or viscous products by pumping

F17D 1/16

. .

Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity

{

(changing the flow or the viscosity by adding a chemical agent C09K 3/00, C10M)

}

F17D 1/17

. . .

by mixing with another liquid,

{

i.e. diluting

}

F17D 1/18

. . .

by heating

F17D 1/20

Arrangements or systems of devices for influencing or altering dynamic characteristics of the systems, e.g. for damping pulsations caused by opening or closing of valves (fluid dynamics F15D; damping pulsations in fluids in pipes in general F16L 55/04)

F17D 3/00

Arrangements for supervising or controlling working operations

F17D 3/01

for controlling, signalling, or supervising the conveyance of a product

F17D 3/03

for controlling, signalling, or supervising the conveyance of several different products following one another in the same conduit, e.g. for switching from one receiving tank to another

F17D 3/05

. .

the different products not being separated (separation of contaminants by distillation B01D 3/00)

F17D 3/08

. .

the different products being separated by "go-devils", e.g. spheres (cleaning devices moved along inside a pipe-line by fluid pressure B08B 9/04;

{

pigs or moles per se, their launching and detection F16L 55/26

}

)

F17D 3/10

for taking out the product in the line (sampling in general, examining the physical or chemical properties of materials G01N)

F17D 3/12

for injecting a composition into the line

F17D 3/14

for eliminating water (separation of liquids B01D, e.g. B01D 17/00; separation of gases or vapours B01D 53/00)

F17D 3/145

. .

{

in gas pipelines

}

F17D 3/16

for eliminating particles in suspension (from liquids by sedimentation B01D 21/00; separation by filtration or otherwise B01D 24/00 to B01D 51/00; centrifugal apparatus B04)

F17D 3/18

for measuring the quantity of conveyed product (measuring volume or volume flow, in general G01F)

F17D 5/00

Protection or supervision of installations (arrangements for protecting foundations E02D 31/00; protecting pipes from damage or internal or external wear F16L 57/00, against corrosion and scale F16L 58/00; investigation of the fluid-tightness of structures G01M 3/00)

F17D 5/005

{

of gas pipelines, e.g. alarm

}

F17D 5/02

Preventing, monitoring, or locating loss

F17D 5/04

. .

by means of a signalling fluid enclosed in a double wall

F17D 5/06

. .

using electric or acoustic means

F17D 5/08

Protection of installations or persons from the effects of high voltage induced in the pipe-line (emergency protective circuit arrangements H02H)