F17D1/00	7	Pipe-line systems (conveying articles or materials through a pipe- line by means of a fluid carrier B65G51/00, B65G53/00; 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 B67D7/00; conveying material which has been excavated by a dredger or soil shifter through a pipe-line E02F7/10; sewer pipe-line systems E03F3/00; thermal insulation of pipe-lines F16L59/00; central heating systems F24D)	F17D1/00	F17D1/00		454
F17D1/005	8	{for a two-phase gas-liquid flow}	F17D1/00	F17D1/00		456
F17D1/02	8	for gases or vapours	F17D1/02	F17D1/02		2486
F17D1/04	9	for distribution of gas	F17D1/04	F17D1/04		2284
F17D1/05	10	Preventing freezing (by heating F16L53/30)	F17D1/05	F17D1/05		172
F17D1/06	9	for steam	F17D1/06	F17D1/06		375
F17D1/065	9	Arrangements for producing propulsion of gases or vapours	F17D1/065	F17D1/065		282
F17D1/07	10	by compression	F17D1/07	F17D1/07		641
F17D1/075	10	by mere expansion from an initial pressure level, e.g. by arrangement of a flow-control valve	F17D1/075	F17D1/075		71
F17D1/08	8	for liquids or viscous products (water-main or service pipe systems E03B7/04; domestic hot-water supply systems F24D17/00)	F17D1/08	F17D1/08		1692
F17D1/082	9	{for cold fluids, e.g. liquefied gas (F17D1/086 takes precedence)}	F17D1/08	F17D1/08		556
F17D1/084	9	{for hot fluids (F17D1/086 takes precedence)}	F17D1/08	F17D1/08		145
F17D1/086	9	{for explosives}	F17D1/08	F17D1/08		96
F17D1/088	9	{for solids or suspensions of solids in liquids, e.g. slurries (F17D1/086 takes precedence)}	F17D1/08	F17D1/08		259
F17D1/12	9	Conveying liquids or viscous products by pressure of another fluid	F17D1/12	F17D1/12		186
F17D1/13	9	Conveying liquids or viscous products by gravity	F17D1/13	F17D1/13		32
F17D1/14	9	Conveying liquids or viscous products by pumping	F17D1/14	F17D1/14		1520
F17D1/16	9	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 C09K3/00, C10M)}	F17D1/16	F17D1/16		583
F17D1/17	10	by mixing with another liquid {, i.e. diluting}	F17D1/17	F17D1/17		456
F17D1/18	10	by heating	F17D1/18	F17D1/18		394
F17D1/20	8	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 F16L55/04)	F17D1/20	F17D1/20		602
F17D3/00	7	Arrangements for supervising or controlling working operations	F17D3/00	F17D3/00		413
F17D3/01	8	for controlling, signalling, or supervising the conveyance of a product	F17D3/01	F17D3/01		8324
F17D3/03	8	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	F17D3/03	F17D3/03		110
F17D3/05	9	the different products not being separated (separation of contaminants by distillation B01D3/00)	F17D3/05	F17D3/05		80
F17D3/08	9	the different products being separated by "go-devils", e.g. spheres (cleaning devices moved along inside a pipe-lines by fluid pressure B08B9/04; {pigs or moles per se, their launching and detection F16L55/26})	F17D3/08	F17D3/08		122
F17D3/10	8	for taking out the product in the line (sampling in general, examining the physical or chemical properties of materials G01N)	F17D3/10	F17D3/10		269
F17D3/12	8	for injecting a composition into the line	F17D3/12	F17D3/12		659
F17D3/14	8	for eliminating water (separation of liquids B01D, e.g. B01D17/00; separation of gases or vapours B01D53/00)	F17D3/14	F17D3/14		255
F17D3/145	9	{in gas pipelines}	F17D3/14	F17D3/14		414
F17D3/16	8	for eliminating particles in suspension (from liquids by sedimentation B01D21/00; separation by filtration or otherwise B01D24/00&#160;-&#160;B01D51/00; centrifugal apparatus B04)	F17D3/16	F17D3/16		111
F17D3/18	8	for measuring the quantity of conveyed product (measuring volume or volume flow, in general G01F)	F17D3/18	F17D3/18		938
F17D5/00	7	Protection or supervision of installations (arrangements for protecting foundations E02D31/00; protecting pipes from damage or internal or external wear F16L57/00, against corrosion and scale F16L58/00; investigation of the fluid-tightness of structures G01M3/00)	F17D5/00	F17D5/00		4409
F17D5/005	8	{of gas pipelines, e.g. alarm}	F17D5/00	F17D5/00		3503
F17D5/02	8	Preventing, monitoring, or locating loss	F17D5/02	F17D5/02		5344
F17D5/04	9	by means of a signalling fluid enclosed in a double wall	F17D5/04	F17D5/04		278
F17D5/06	9	using electric or acoustic means	F17D5/06	F17D5/06		4206
F17D5/08	8	Protection of installations or persons from the effects of high voltage induced in the pipe-line (emergency protective circuit arrangements H02H)	F17D5/08	F17D5/08		84
