EP3006813B1 - A method of preparing a system for maintenance - Google Patents

A method of preparing a system for maintenance Download PDF

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Publication number
EP3006813B1
EP3006813B1 EP15184966.8A EP15184966A EP3006813B1 EP 3006813 B1 EP3006813 B1 EP 3006813B1 EP 15184966 A EP15184966 A EP 15184966A EP 3006813 B1 EP3006813 B1 EP 3006813B1
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EP
European Patent Office
Prior art keywords
subsystem
valve seat
gas
sealing valve
maintenance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15184966.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3006813A1 (en
Inventor
Jeroen Martijn PRONK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valvetight Holding Bv
Original Assignee
Valvetight Holding Bv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valvetight Holding Bv filed Critical Valvetight Holding Bv
Priority to PL15184966T priority Critical patent/PL3006813T3/pl
Publication of EP3006813A1 publication Critical patent/EP3006813A1/en
Application granted granted Critical
Publication of EP3006813B1 publication Critical patent/EP3006813B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0326—Valves electrically actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0338—Pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0341—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/015—Facilitating maintenance

Definitions

  • the present invention relates to a method of preparing a system for a maintenance operation, said system comprising
  • Systems comprising super-atmospheric gas are well known in the art. They are for example systems comprising natural gas, syngas, or carbon dioxide, where the gas is treated, or increased or reduced in pressure. Such a gas may thus be flammable, toxic or otherwise constitute a hazzard. Often it is paramount that a plant comprising such a system remains operational despite the maintenance, or that the downtime for maintenance is kept to a minimum. The presence of gas escaped from the system at the location where maintenance is to be performed may however pose a risk for people performing the maintenance. Depending on the job at hand, these may be expensive specialists and the number of them can be considerable.
  • the object of the present invention is to provide a method with a reduced risk of delay and/or an increased level of safety and/or to improve the availability of a plant or a larger part thereof. This in particular in case of leaky or potentially leaking seals of the valve seats.
  • a method according to the preamble is characterized in that the method comprises before performing a maintenance step of the maintenance operation with the intermediate subsystem and the further intermediate subsystem in a closed position
  • the third subsystem can be isolated from the first and second subsystem and subjected to maintenance without having to depressurize either of the first and second subsystems.
  • maintenance includes any work on a third subsystem, whether it is inspection, cleaning, repair, modification, or replacement of a part.
  • a maintenance operation is a series of one or more maintenance steps, and the method according to the invention specifies that at least one of these is not performed before the discharge of gas using suction.
  • the third subsystem typically comprises an apparatus such as a compressor, a flow metering systeem, a gas drying equipment, a tank or a vessel, a filter separator, a heat exchanger, a well head, or a vapour recovery unit.
  • the intermediate subsystems comprise for example a ball valve, said ball valve comprising the valve seats and the vent opening.
  • a sub-atmospheric pressure between the first sealing valve seat and the second valve seat prevents gas from flowing past it to the second subsystem.
  • Any sub-atmospheric pressure is effective, however minute.
  • the sub-atmospheric pressure is at least 0.02 Bar below ambient atmospheric pressure, preferably at least 0.05 Bar and more preferably at least 0.08 Bar.
  • a deeper sub-atmospheric pressure makes the method less susceptible to any changes in sub-atmospheric pressure applied or other disturbances.
  • both intermediate subsystems are at sub-atmospheric pressure.
  • gas also encompasses vapour.
  • the term 'sealing valve seat' is a seat for blocking the flow of pressurized gas from a pressurized subsystem to a subsystem at a lower pressure, such as a depressurized subsystem.
  • the gas is discharged using a bleed conduit that releases the gas from the intermediate subsystem into the outside atmosphere at a safe location away from the location where maintenance is to be performed.
  • the bleed line comprises between a pressure gauge and a vacuum pump a valve, e.g. an on-off valve, a control valve, a pressure regulator, or a non-return valve.
  • WO2005/026603 discloses a method of vacuum-purging gas in a pipe or tank.
  • the intermediate subsystem, the third subsystem and the further intermediate subsystem define a branche connecting the first subsystem with the second subsystem, the system further comprising a second branch connecting the first subsystem and the second subsystem.
  • Such a system allows for maintenance of the third subsystem of one branch while the other branch remains operational, albeit the system operates possibly at a lower capacity.
  • the system comprises a pressure gauge for measuring the pressure of an intermediate subsystem of the system.
  • the pressure gauge can also be used to control the vacuum pump used to provide suction. Also, the pressure gauge can be used in combination with a PLC to detect a sudden leak rate (exceeding of a preset pressure gradient limit) or a leak rate beyond the capacity of the suction system (exceeding of a preset pressure limit) and can be used to generate an alarm at the location where the maintenance is performed and/or in the Control Room without delay in case of a developping potential dangerous situation.
  • the system comprises a pressure gauge for measuring the pressure upstream of a vacuum pump providing said suction, the flow resistance R vv-pg between i) the location of the gas between the first sealing valve seat and the second valve seat and ii) the location of the pressure gauge being lower than the flow resistance R pg-vp between i) the location of the pressure gauge and ii) the vacuum pump.
  • the pressure measured by the pressure gauge represents the pressure between the first sealing valve seat and the second valve seat, with a sub-atmospheric reading indicating that no gas will pass from the first subsystem past the second valve seat.
  • the relatively high flow resistance between the pressure gauge and the vacuum pump can be achieved using a constriction. For practical purposes, the constriction will be balanced by the desire to effectively extract gas to be discharged by the vacuum pump.
  • the gas extracted by suction is diluted to below the its Lower Explosion Limit.
  • natural gas will be diluted to below 5% by volume of natural gas in air. Thus it cannot explode.
  • dilution is done with an inert gas.
  • the inert gas is for example carbon dioxide.
  • the inert gas is flue gas obtained by combustion, e.g. by combusting a hydrocarbon such as methane, propane, butane, or a liquid fuel such as diesel or gasoline.
  • a hydrocarbon such as methane, propane, butane, or a liquid fuel such as diesel or gasoline.
  • the inert gas is nitrogen or steam, both of which are often available at plants.
  • the suction is applied using a venturi-based vacuum pump.
  • the venturi-based pump is an ejector or a jet pump.
  • the venturi-based pump is preferably fed with an inert gas such as nitrogen or steam instead of air, reducing the risk of an explosive atmosphere in the means used for discharging the gas.
  • the intermediate subsystems comprise a ball valve, said ball valve comprising the first sealing valve seat, the second valve seat and the vent opening.
  • Venting ball valves is an important area of application of the method according to the invention.
  • the second valve seat is a second sealing valve seat.
  • the second sealing valve seat acts as a safety measure should there be a failure in the system that provides for the sub-atmospheric pressure.
  • a ball valve comprising both first and second sealing valve seats is commercially available as a ball valve with double-piston effect, a.k.a. as a double isolation and bleed valve.
  • the fourth valve seat is a fourth sealing valve seat.
  • the sub-atmospheric pressure is maintained while the at least one maintenance step of the maintenance procedure is performed.
  • the method is a method for performing maintenance.
  • the sub-atmospheric pressure is maintained during the full maintenance procedure, thus reducing the risk of gas leakage via an intermediate system to the depressurized third subsystem during the full maintenance procedure.
  • the pressure in the intermediate subsystem is monitored using a pressure gauge, and a vacuum pump used for applying suction is controlled by the pressure gauge.
  • an inert gas such as nitrogen
  • This control of the suction is for example achieved by controlling the flow of the motive gas for a venturi-based vacuum pump.
  • the bleed line comprises between the pressure gauge and the vacuum pump a non-return valve.
  • the vacuum pump When a sufficiently low pressure in the intermediate subsystem is achieved, measured by the pressure gauge, the vacuum pump can be stopped upon which this non-return valve closes. In case the pressure in the intermediate subsystem then raises due to leakage of pressured gas and/or air into the intermediate subsystem, and exceeds a certain preset level, the vacuum pump can be started again, until the pressure is sufficiently low to stop the pump again, etcetera. If there is very little leakage of pressured gas and/or air into the intermediate system, limited uptime of the pump needs to be applied and a significant saving in energy and/or inert gas is achieved.
  • the third subsystem comprises a compressor.
  • the method according to the present invention relates to a method of preparing a system comprising a compressor, which is an important area of application of the method.
  • Fig. 1 shows a schematic layout of a system 100 comprising a first subsystem 110 and a second subsystem 120.
  • the system 100 comprises a first branch 101 connecting the first subsystem 110 to the second subsystem 120; and comprises a second branch 102, also connecting the first subsystem 110 with the second subsystem 120.
  • natural gas in the first subsystem 110 with a pressure of 90 Bar is raised in pressure to 200 Bar using compressors 121, 121'.
  • compressor 121 of the first branch 101 needs maintenance, it needs to be isolated from any subsystem that remains pressurized and be brought to atmospheric pressure.
  • the intermediate subsystem of the first branch comprises an upstream ball valve 123
  • the further intermediate subsystem 170b comprises a downstream ball valve 122.
  • both of these ball valves are closed.
  • said ball valves are double piston effect ball valves.
  • the internal volume of the ball valves contain gas under high pressure. This gas is, as is known in the art, discharged via a bleed opening into the (outside) atmosphere.
  • gas may stil leak from the first subsystem 110 towards the compressor 121, causing a dangerous situation to exist.
  • a sub-atmospheric pressure is applied to the ball valves by connecting a bleed line 150 and a vacuum pump 160 to the bleed opening. This will be discussed in more detail with reference to Fig. 2 .
  • the bleed line 150 is provided with an ejector vacuum pump 160, driven by an air pump 161.
  • This air pump 161 preferably provides so much motive air that the gas in the bleed line 150 is diluted to below the Lower Explosion Limit, eliminating the danger of an explosion, and discharged via a section of the bleed line 150 downstream of the ejector vacuum pump 160 to a safe location.
  • the second branch 102 can remain operational, whereas maintenance can be performed on the first branch 101.
  • Fig. 2 shows a cross-sectional view through an intermediate subsystem 170 of the system of Fig. 1 , embodied in a ball valve comprising a housing 205.
  • the ball valve is a standard double-piston-effect ball-valve comprising a first sealing valve seat 231 and a second sealing valve seat 241.
  • the valve seats can slide in a corresponding seat pocket.
  • the first sealing valve seat 231 comprises a through-hole 232 and the second sealing valve seat 241 comprises a through-hole 242.
  • the ball valve further comprises a ball 233 having a through-hole 234.
  • Springs 291 are present to push the valve seats against the ball 233.
  • the ball 233 can be rotated using spindle 292 so as to open and close the ball valve. In Fig. 2 it is closed. If the ball 233 is rotated over 90°, the through-holes 232, 234 and 242 are aligned and the ball 233 allows gas to be transported through the ball valve.
  • a vent opening 246 is provided, which is connected to bleed line 150.
  • a ball valve as disclosed above is known in the art.
  • suction is applied.
  • gas actively discharged from the cavity 245 but more importantly leakage of gas via the first sealing valve seat 231 through the second valve seat 241 is reduced and - if sub-atmospheric pressure is achieved in the cavity of the ball valve - prevented.
  • escape of gas from the first subsystem 110 downstream of the second valve seat 241 can be prevented, helping to create a safe working environment for performing a maintenance operation.
  • a pressure gauge 270 for determining whether sub-atmospheric pressure has been achieved, indicating that no gas will escape from the ball valve.
  • the pressure gauge 270 can be used to control the air pump 161, which can save energy and/or save inert gas such as nitrogen if that is used as motive gas.
  • the bleed line 150 comprises between the pressure gauge 270 and the vacuum pump 160 a non-return valve 287. When a sufficiently low pressure in the intermediate subsystem is achieved, meassured by the pressure gauge, the vacuum pump can be stopped upon which this non-return valve closes.
  • the vacuum pump can be started again, until the pressure is sufficiently low to stop the pump again, etcetera. If there is very little leakage of pressured gas and/or air into the intermediate system, limited uptime of the pump needs to be applied and a significant saving in energy and/or inert gas is achieved.
  • the bleed line 150 contains a constriction 251.
  • the flow resistance in an upstream section 252 of the bleed line 150 where the pressure gauge 270 is located is lower than the flow resistance in a downstream section 253 between the pressure gauge 270 and the ejector vacuum pump 160.
  • the reliability of the pressure gauge 270 being capable of indicating that a sub-atmospheric pressure is present in the cavity 245 is improved when the pump is in operation and the non-return valve 287 is open.
  • a drain opening 293 may be present between the first sealing valve seat 231 and the second valve seat 241. During normal operation this drain opening 293 is closed using a plug. While not preferred because gas might escape via it, an open drain opening 293 is allowable if strong suction is applied by the vacuum pump (here ejector vacuum pump 160), in particular if the flow resistance via said drain opening 293 is larger than the flow resistance in the bleed line 150 from the cavity to the ejector vacuum pump 160. Thus, ambient air is sucked in, preventing gas from escaping from the cavity 245 through the drain opening 293.
  • the drain opening 293 may be advantageously provided with the pressure gauge 270, to ensure the reading on the pressure gauge corresponds with the pressure in the cavity and is not affected by any dynamic pressure losses in the bleed line 150.
  • Fig. 3 corresponds substantially to Fig. 1 , with the difference that instead of (double piston effect) ball valves use is made of two pairs of single sealing seat valves 330. Each pair has a bleed line 336 provided between the two single sealing seat valves 330 of that pair.
  • the second branch 102 which connects the pressurized first subsystem 110 with the pressurized subsystem 120, the valves 330 open and the valves 335 closed, the second branch 102 can remain operational, whereas maintenance can be performed on the first branch 101 safely.
  • the method according to the present invention can be varied in many ways within the scope of the appending claims.
  • one of the pressurized subsystems 110, 120 is depressurized during maintenance, only one intermediate subsystem 170 is necessary.
  • the bleed lines 150 may be present permanently in a system, or are connected to an intermediate system using a mobile vacuum system before maintenance and removed after maintenance.
  • Each individual intermediate subsystem may have an individual suction system, independent of other intermediate subsystems, or they can be combined in any favourable combination, depending on the situation at hand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP15184966.8A 2014-09-19 2015-09-12 A method of preparing a system for maintenance Active EP3006813B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15184966T PL3006813T3 (pl) 2014-09-19 2015-09-12 Sposób przygotowywania systemu do konserwacji

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2013505A NL2013505B1 (en) 2014-09-19 2014-09-19 A method of preparing a system for maintenance.

Publications (2)

Publication Number Publication Date
EP3006813A1 EP3006813A1 (en) 2016-04-13
EP3006813B1 true EP3006813B1 (en) 2019-02-20

Family

ID=52146615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15184966.8A Active EP3006813B1 (en) 2014-09-19 2015-09-12 A method of preparing a system for maintenance

Country Status (6)

Country Link
EP (1) EP3006813B1 (pl)
ES (1) ES2725443T3 (pl)
HU (1) HUE043340T2 (pl)
NL (1) NL2013505B1 (pl)
PL (1) PL3006813T3 (pl)
TR (1) TR201907036T4 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022220676A1 (en) * 2021-04-16 2022-10-20 Valvetight Holding Bv A method of preparing a system for a maintenance operation

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Publication number Priority date Publication date Assignee Title
JPH10331624A (ja) * 1997-06-03 1998-12-15 Sony Corp 有害ガス排気装置
JP2000161592A (ja) * 1998-11-24 2000-06-16 Osaka Gas Co Ltd ガスパージ装置およびガスパージ装置搭載車
EP1254318B1 (de) * 2000-02-11 2003-06-04 Hydac Technology Gmbh Vorrichtung zum entfernen von fluid aus einem behälter
JP4313123B2 (ja) * 2003-09-09 2009-08-12 東京瓦斯株式会社 既設配管、既設タンク内ガスの真空パージ方法及びそのためのシステム
US20110133942A1 (en) * 2006-12-29 2011-06-09 Flanders Patrick S Apparatus and method for clustered wellhead high integrity protection system
US7621302B2 (en) * 2007-09-28 2009-11-24 Airgas, Inc. Coriolis dosing system for filling gas cylinders

Non-Patent Citations (1)

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Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022220676A1 (en) * 2021-04-16 2022-10-20 Valvetight Holding Bv A method of preparing a system for a maintenance operation
NL2027992B1 (en) * 2021-04-16 2022-10-31 Valvetight Holding Bv A method of preparing a system for a maintenance operation

Also Published As

Publication number Publication date
HUE043340T2 (hu) 2019-08-28
NL2013505B1 (en) 2016-09-29
ES2725443T3 (es) 2019-09-24
EP3006813A1 (en) 2016-04-13
TR201907036T4 (tr) 2019-06-21
PL3006813T3 (pl) 2019-08-30

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