WebCPC 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)

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 B67D 5/00; 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)