EP0495243A1 - Procédé et dispositif pour nettoyer des citernes à toits flottants pour mettre en dépôt l'huile brute - Google Patents

Procédé et dispositif pour nettoyer des citernes à toits flottants pour mettre en dépôt l'huile brute Download PDF

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Publication number
EP0495243A1
EP0495243A1 EP91122090A EP91122090A EP0495243A1 EP 0495243 A1 EP0495243 A1 EP 0495243A1 EP 91122090 A EP91122090 A EP 91122090A EP 91122090 A EP91122090 A EP 91122090A EP 0495243 A1 EP0495243 A1 EP 0495243A1
Authority
EP
European Patent Office
Prior art keywords
crude oil
residue
cleaning
gear
support
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.)
Granted
Application number
EP91122090A
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German (de)
English (en)
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EP0495243B1 (fr
Inventor
Dietrich Sobinger
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Individual
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Individual
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Publication date
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Publication of EP0495243A1 publication Critical patent/EP0495243A1/fr
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Publication of EP0495243B1 publication Critical patent/EP0495243B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B08B9/0933—Removing sludge or the like from tank bottoms

Definitions

  • the invention relates to a method for cleaning floating roof tanks for the storage of crude oil with recovery of sedimented residues, according to which crude oil is mixed into the respective residue in a predetermined mixing ratio and the liquefied residue portion is pumped out and fed to a distillation plant.
  • Rapid flushing with crude oil or flushing with a tempered middle distillate combined with pumping to another storage tank, also has disadvantages yourself. Because part of the whirled up residue settles in the storage tank, even if it is pumped directly into a distillation plant. In addition, rinsing with hot middle distillate has the disadvantage that, although the light constituents are quickly removed from the residue, the remaining amount of residue forms an even more viscous and more difficult to remove mass than before treatment with tempered middle distillate.
  • the residue is liquefied by adding crude oil, in a mixing ratio of up to 1: 5, depending on the type of crude oil used.
  • the residue is liquefied to such an extent that it becomes pumpable and can then be sent to a refinery for further processing.
  • the conventional storage tanks and in particular floating roof tanks have a diameter of 50 to 100 m and only a small number of manholes through which cleaning devices can be placed in the storage tank.
  • smaller openings are available in larger numbers if you remove the individual roof supports from a floating roof tank.
  • Cleaning lances with a pressure line connection for pumping in crude oil can be introduced through these openings.
  • the cleaning lances are designed as nozzle tubes with exchangeable nozzles at the ends.
  • the emerging jet streams can be directed into the residue within a specified radius.
  • the known cleaning lances have no supporting function and cannot take over the load of the floating roof when lying on it.
  • simply pumping fresh crude oil into and out of the floating roof tank is not very successful, since the swirling effect is too low.
  • the invention has for its object to provide a method for cleaning floating roof tanks of the embodiment described above, according to which a particularly rational and effective liquefaction of the residues is achieved.
  • a suitable cleaning system is to be created, the cleaning devices of which can at the same time take on real support function with respect to the floating roof.
  • this object is achieved in that initially residual crude oil located above the residue is provided via a suction support is suctioned off and then pumped into the residue at predetermined pressure via cleaning supports, with the remaining residue being swirled, and that fresh crude oil is sucked in from a crude oil store in the course of the residue liquefaction after the remaining crude oil has been consumed, and also swirled and liquefied with the remaining residues via the cleaning supports predetermined pressure is pumped until the entire residue is liquefied and pumped out of the floating roof tank via at least one pump support.
  • the liquefaction of the residue with residual crude oil and fresh crude oil can take place at intervals as well as continuously.
  • the composition the quantity dispensed from the floating roof tank to be cleaned is monitored by daily analyzes. If the proportion of inorganic substances rises above a predefined value, the delivery quantity can be mixed down to an acceptable value for the distillation plant by adding fresh crude oil.
  • the method according to the invention it is possible to carry out the entire rough cleaning of a floating roof tank. All that remains is a pumpable mixture of crude oil and residue, which is flushed from the bottom by introducing middle distillate and transferred to the distillation system via the cleaning system. After that, only a few hydrocarbons with a flash point above 55 ° C remain.
  • the floating roof tank can be entered without breathing protection. It is not necessary to enter the potentially explosive and hazardous tank area with a breathing mask during rough cleaning. As a result, cleaning staff are no longer at risk.
  • the invention also relates to a cleaning system for floating roof tanks with a floating roof guided vertically on roof supports, the roof supports optionally being interchangeable with cleaning devices with a pressure line connection leading to a pump unit for pumping in crude oil.
  • This cleaning system is characterized in that the roof supports are optionally interchangeable with the roof load-bearing cleaning supports as cleaning devices and at least against one suction support and one pump support, and that the suction support has a Suction line connection can be connected to the pump unit and the pump support has a discharge line connection for the liquefied residue.
  • the existing roof supports are removed from the floating roof and replaced by cleaning supports according to the invention.
  • these cleaning supports fulfill the necessary support function when the floating roof is lying on top, on the other hand they stir up the residue in the course of pumping in initially residual and finally fresh crude oil. Due to the lowering of the tank content and consequently the floating roof, the cleaning supports are put on the tank floor after a certain time and take on the roof load in addition to their cleaning function. This gives the possibility that the cleaning system can work continuously during the entire liquefaction process. This leads to considerable time and cost savings.
  • the invention proposes, and this proposal is of independent importance that the cleaning supports each have a support tube with a crude oil line connection at the upper tube end and a drive motor for a drive shaft mounted in the support tube, that a tube section with interchangeable nozzles arranged over its circumference is rotatable at the lower tube end is mounted and connected to the drive shaft, and that the support tube has a tubular base with a rotary bearing, for example roller bearings, for the drive shaft.
  • the drive motor is preferably designed as a compressed air motor and connected to the drive shaft protruding from the upper pipe end.
  • an electric motor or the like can also be used.
  • a compressed air connection with a compressed air control valve is expediently provided for the drive motor, the compressed air control valve being connected to the support tube on the side opposite the crude oil line connection and only opening at a predetermined crude oil pressure, that is to say dry running is prevented.
  • the drive shaft is preferably connected to the tubular casing section by means of a gear, for example a planetary gear, and the tubular casing section in the transmission area is designed as a ring gear with internal teeth for the planetary gear.
  • a gear for example a planetary gear
  • the tubular casing section in the transmission area is designed as a ring gear with internal teeth for the planetary gear.
  • the invention further recommends that the support tube has a tube extension with a central bearing bush for the drive shaft and with the bearing bush surrounding axial bores for crude oil passage, and that the tube extension below the axial bores and in Area of the nozzles forms a distribution chamber with the pipe jacket section, which is aligned with the pipe extension and partially overlaps the pipe extension.
  • the planetary gear overlapped by the tubular casing section has a gear foot and a gear cover, the tubular casing section being rotatably mounted on the gear cover, for example with the interposition of a roller bearing, and the gear cover being detachably fastened, for example screwed, to the central bearing bush of the pipe extension.
  • the gear base preferably forms an aligned extension of the support tube or its tubular casing section and a detachable base plate is inserted into the gear base, the rotary bearing for the drive shaft being arranged between the gear base and the base plate.
  • the gear base, the base plate and a bottom-side elastomer bearing for the gear base and the base plate can form the tube base.
  • an appropriate support is realized when the cleaning support is placed on the tank bottom.
  • the invention teaches that the support tube at the upper tube end has a cross-piece with holding tabs that extend into the floating roof for the exchange of supports and that locking screws that can be tightened against the respective tube holder are mounted in the holding tabs.
  • the holding straps are adjustable in height to compensate for different floor heights.
  • the crossmember or the holding straps can have support brackets.
  • a cleaning system for floating roof tanks 1 is shown with a floating roof 3 movably guided on roof supports 2, the roof supports 2 being optionally interchangeable with cleaning devices 4 with a pressure line connection leading to a pump unit 5 for pumping in crude oil.
  • the roof supports 2 are optionally interchangeable with cleaning supports 4 as cleaning devices and at least in each case against a suction support 6 and a pump support 7.
  • the suction support 6 can be connected to the pump unit 5 via a suction line connection.
  • the pump support 7 has a discharge line connection for liquefied residue leading to a distillation plant.
  • Each cleaning support 4 has a support tube 8 with a crude oil line connection 9 at the upper tube end and a drive motor 10 for a drive shaft 11 mounted in the support tube 8.
  • a tube jacket section 12 with rotatable (interchangeable and adjustable) nozzles 13 is mounted on the circumference and attached to the Drive shaft 11 connected.
  • the support tube 8 has a tube base with a pivot bearing 14, for example roller bearings, for the drive shaft 11.
  • the drive motor 10 is designed as a compressed air motor and is connected to the drive shaft 11 protruding from the upper pipe end.
  • a compressed air connection with a compressed air control valve 15 is provided for the drive motor 10.
  • the compressed air control valve 15 is connected to the support tube 8 on the side opposite the crude oil line connection 9 and opens at a predetermined crude oil pressure.
  • the drive shaft 11 is by means of a gear, namely Planetary gear 16 connected to the tubular casing section 12.
  • the tubular casing section 12 is designed in the transmission area as a ring gear with internal teeth for the planetary gear 16.
  • the support tube 8 has a tube extension 17 with a central bearing bush 18 for the drive shaft 11 and with axial bores 19 surrounding the bearing bush 18 for crude oil passage.
  • the pipe extension 17 forms below the axial bores 19 and in the area of the nozzles 13 a distributor chamber 20 with the pipe jacket section 12 which is supported against the bearing bush 18 and which is aligned with the pipe extension and partially overlaps the pipe extension 17.
  • the planetary gear 16 overlapped by the tubular casing section 12 has a gear foot 21 and a gear cover 22, the tubular casing section 12 being rotatably mounted on the gear cover 22, for example with the interposition of a roller bearing 23, and the gear cover 22 being detachable on the central bearing bushing 18 of the pipe extension 17 is attached.
  • the pipe jacket section 12 is sealed against the pipe extension 17, the gear foot 21 and the central bearing bush 18 of the pipe extension by means of O-rings.
  • the gear foot 21 forms an aligned extension of the support tube 8 or its tubular casing section 12.
  • a detachable foot plate 24 is inserted in the gear foot 21.
  • the pivot bearing 14 for the drive shaft 11 is arranged between the gear foot 21 and the foot plate 24.
  • the gear foot 21, the foot plate 24 and a bottom-side plastic plate 25 for the gear foot 21 form the tube foot.
  • the support tube 8 has, at the upper tube end, a crossmember 26 with tubular tubes 27 inserted into the floating roof 3 and only indicated, for the retaining tabs 28 spanning the supports. In the holding tabs 28 there are locking screws 29 which can be tightened against the respective tubular tube 27.
  • the cross member 26 or the holding tabs 28 also have support brackets 30.
  • crude oil 31 located above the residue in the floating roof tank 1 is first sucked off via the suction support 6 or through a roof hole. This remaining crude oil is then pumped through the cleaning supports 4 with the remaining residue 32 being swirled into the residue at a predetermined pressure. Only after the remaining crude oil has been consumed in the course of the residue liquefaction, fresh crude oil is sucked in by the pump unit 5 and pumped into the residue 32 for further liquefaction via the cleaning supports 4 until the entire residue is liquefied and pumped out of the floating roof tank 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP91122090A 1991-01-17 1991-12-22 Procédé et dispositif pour nettoyer des citernes à toits flottants pour mettre en dépôt l'huile brute Expired - Lifetime EP0495243B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4101184 1991-01-17
DE4101184A DE4101184C2 (de) 1991-01-17 1991-01-17 Verfahren und Anlage zum Reinigen von Schwimmdachtanks zum Lagern von Rohöl

Publications (2)

Publication Number Publication Date
EP0495243A1 true EP0495243A1 (fr) 1992-07-22
EP0495243B1 EP0495243B1 (fr) 1994-07-27

Family

ID=6423152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91122090A Expired - Lifetime EP0495243B1 (fr) 1991-01-17 1991-12-22 Procédé et dispositif pour nettoyer des citernes à toits flottants pour mettre en dépôt l'huile brute

Country Status (3)

Country Link
EP (1) EP0495243B1 (fr)
AT (1) ATE109035T1 (fr)
DE (1) DE4101184C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032238A1 (fr) * 1997-12-15 1999-07-01 Petrojet International S.A. Procede de nettoyage d'une cuve de petrole et dispositif pour la mise en oeuvre dudit procede
WO1999037415A1 (fr) * 1998-01-22 1999-07-29 Lindenport S.A. Lances de fluidification et leur configuration
WO2003004181A1 (fr) * 2001-07-06 2003-01-16 David Mackrill Appareil et procede de nettoyage
GB2397996A (en) * 2003-02-07 2004-08-11 Willacy Oil Services Ltd Sludge dispersal/inhibition in floating roof storage tanks
US11161685B2 (en) 2018-07-19 2021-11-02 Reg MacLeod Light footing shoring of a floating roof inside a tank during tank inspection and maintenance

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999036198A1 (fr) * 1996-07-15 1999-07-22 Disab Vacuum Technology Ab Procede de receuil d'une matiere visqueuse et epaisse
DE19702462C1 (de) * 1997-01-24 1998-04-16 Dietrich Sobinger Verfahren und Reinigungsanlage zum Reinigen von Tanks zur Lagerung von Ölprodukten
DE10131419B4 (de) * 2001-06-29 2004-12-02 Lobbe Tankschutz Gmbh Vorrichtung und Verfahren zum Reinigen von Tanks zur Lagerung von Rohöl
CN103658120B (zh) * 2013-12-27 2015-08-26 蒋文明 一种原油管道凝管解堵器及使用该解堵器的解堵方法
WO2024063172A1 (fr) * 2022-09-21 2024-03-28 손성근 Système de nettoyage de réservoir de pétrole brut

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3240186A1 (de) * 1981-12-28 1983-07-07 Taiho Industries Co., Ltd., Tokyo Verfahren und vorrichtung zum entfernen von schlamm aus einem schwimmdachoeltank
WO1987005835A1 (fr) * 1986-03-27 1987-10-08 Sobinger Dietrich Recuperation de sediments de petrole brut dans des citernes de stockage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3240186A1 (de) * 1981-12-28 1983-07-07 Taiho Industries Co., Ltd., Tokyo Verfahren und vorrichtung zum entfernen von schlamm aus einem schwimmdachoeltank
WO1987005835A1 (fr) * 1986-03-27 1987-10-08 Sobinger Dietrich Recuperation de sediments de petrole brut dans des citernes de stockage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032238A1 (fr) * 1997-12-15 1999-07-01 Petrojet International S.A. Procede de nettoyage d'une cuve de petrole et dispositif pour la mise en oeuvre dudit procede
WO1999037415A1 (fr) * 1998-01-22 1999-07-29 Lindenport S.A. Lances de fluidification et leur configuration
WO2003004181A1 (fr) * 2001-07-06 2003-01-16 David Mackrill Appareil et procede de nettoyage
GB2397996A (en) * 2003-02-07 2004-08-11 Willacy Oil Services Ltd Sludge dispersal/inhibition in floating roof storage tanks
GB2397996B (en) * 2003-02-07 2005-01-19 Willacy Oil Services Ltd Sludge dispersal/inhibition in floating roof storage tanks
US11161685B2 (en) 2018-07-19 2021-11-02 Reg MacLeod Light footing shoring of a floating roof inside a tank during tank inspection and maintenance

Also Published As

Publication number Publication date
DE4101184A1 (de) 1992-07-23
DE4101184C2 (de) 1994-07-14
ATE109035T1 (de) 1994-08-15
EP0495243B1 (fr) 1994-07-27

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