WO2003023351A1 - Systeme automatique de detection et de surveillance des fuites dans des appareils haute pression - Google Patents

Systeme automatique de detection et de surveillance des fuites dans des appareils haute pression Download PDF

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Publication number
WO2003023351A1
WO2003023351A1 PCT/IB2002/003095 IB0203095W WO03023351A1 WO 2003023351 A1 WO2003023351 A1 WO 2003023351A1 IB 0203095 W IB0203095 W IB 0203095W WO 03023351 A1 WO03023351 A1 WO 03023351A1
Authority
WO
WIPO (PCT)
Prior art keywords
detecting
high pressure
fact
pressure equipment
equipment according
Prior art date
Application number
PCT/IB2002/003095
Other languages
English (en)
Inventor
Adalberto Bestetti
Original Assignee
Siirtec Nigi Spa
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 Siirtec Nigi Spa filed Critical Siirtec Nigi Spa
Publication of WO2003023351A1 publication Critical patent/WO2003023351A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/186—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/042—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid
    • G01M3/045—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid with electrical detection means

Definitions

  • the object of the present invention relates to an automatic, highly sensitive and reliable system for detecting and monitoring leakages of process fluids contained in internally lined high pressure equipment.
  • I I formed by a number of sheets shaped each to adhere as much as po Issible to the pressure resistant body and welded together to each other (loose lining) .
  • the pressure resistant body can be of any known type in the art: solid wall, multi-layer, multi-wall, etc.
  • the corrosive fluid corrodes the carbon steel or the low-alloy steel not only in the area close to the leakage, but it may corrode also a much larger area due to the fact that it may also spread in the interstitial gap formed between the lining and the pressure resistant body being the contact between them not a sealing contact.
  • the co)::rosion may compromize the stability of the equipment making it unusable or, even worth, causing the explosion of the equipment with economical damages and/or even injuries or loss of human lives. In order to make evident when a leakage occurs in an
  • weep-holes are provided in the pressure resistant body mainly in correspondence to the sheet circur ⁇ pherential and longitudinal welding areas .
  • the weep-holes go through the whole thickness of the pressure resistant body from the external side to the internal lining and they also are protecited from corrosion by small pipes made of the same anticorrosive ! material as the lining.
  • the purpose of these weep-holes is to remove any possible corrosion fluid which may get into contact with the pressure resistant body and, mainly, they represent the possibility for the plant operators to check by visual inspection the possible existence of any leakage and consequently to take the necessary steps to prevent damages.
  • This method for detecting leakages of fluids from a weep- holes has the disadvantage that, should the leakage be very scanty, the operator' s observation may fail to detect them.
  • leakages of the corrosive fluids 1 i may, w Ihen expanded i, cause plugging of the weep- holes, so nullifying the visual inspection of the operators .
  • a typical case is represented by the urea plant wherein corrosive fluids, kept inside the equipment under pressure at 140-250 bar and at a temperature of 190-210°C, when leaking out, may crystallize so plugging the weep-holes. It is known that in order to make this check easier, in some plants, all the weep-holes are provided with small glass or transparent plastic bottle like vessels which contain a reagent able to change colour in the presence of
  • German Patent 19740340 C2 The detecting device, installed in each weep-hole, essentially consists in a small tube, made of the isame material as the lining, wherein the possible leakage of process corrosive fluid, mainly consisting in a liquid or a gas, provokes the closure of an Electric circuit and consequently a bulb lightens and/or an alarm is operated.
  • the corrosive fluid is a gas, it moves a piston, positioned inside the tube, by which the electric circuit is also closed.
  • a loose lining such as reactors, heat exchangers, columns, vessels and the like containing fl ids corrosive in respect to the pressure resistant body, whose integrity is vital to the plant operation as well as to the safety and life of operators.
  • Such detecting and monitoring system is characterized by a continuous operation and is completely free from the drawbacks shown by the mentioned known methods . Furthermore the system is practically free from operating and maintenance costs and does not require any active supervision from the operators.
  • invention is essentially formed by a number of detectors which are inserted into each of the weep-holes of one or more equipment present in a plant handling corrosive fluids
  • Each detector is electrically connected to a relay, l Iocated close to the equipment under control, by which possible visual and/or acoustic signals are made evident to the operators.
  • Said detectors may be connected even in groups in parallel, for example 6 to 10, to a single relay, so that the number of relays is the same as the number of detectors or lower.
  • each detector or a group of them is identified by a number by which, in case of an operated alarm, the involved detector or the group of detectors is disclosed.
  • Another object of the present invention is represented by the connection between the central connecting box and the control board located in the plant control room, continuously watched during the plant operation, where electric/electronic signals are transferred or incorporated in a DCS system.
  • a further object of the invention is represented by an autotesting electric circuit able to provide information about the integrity of the electric circuit itself.
  • a part of this electric circuit, having a particular resistance, and the most external part of the detector are very close to each other and contained in a small box which may be of xplosion proof type.
  • Still a furth r object of the invention is represented by i I the possibility to verify from the control board, located
  • the detecting and monitoring system of the present invention can be installed in new as well as in already existing equipment.
  • Figurej 1 shows the block diagram by which the different parts ' of the detecting and monitoring system of the 'invention are each other connected.
  • Figure 2 represents in more details the detecting and monitoring system generically indicated in Figure 1: in particular it is clearly evidenced the connection between the weep-hole and the detecting part of the system (detector) , partially inside a detector box which can be of the explosion proof type, as well as the connection between the detector and the other parts of the system.
  • Figurej, 3 is an axonometric view of the detector box of
  • Figure 2 represents a side view of the detector box of
  • Figure 5 represents the circuit of Figure 2 in three different situations: a normal functioning of the equipment and two upset conditions.
  • Figure 6 represents two portions of the electric wire inside the detector: one inside the weep-hole and the other
  • the central connecting box (7) is connected to a plurality of circuits (6) each corresponding to a single weep-hole
  • a small tube (11) is connected with [the weep-hole (5) by means of a connecting piece (28) and it contains, at the opposite end, surmounted by a bracket '(16) , a suitably shaped hard plastic piston (12) , which can slide inside the tube (11) to a limited extent, but is prevented from entirely enter it.
  • a bracket '(16) a suitably shaped hard plastic piston (12) , which can slide inside the tube (11) to a limited extent, but is prevented from entirely enter it.
  • a by-pass (15) becomes closed in the circuit (6) and a higher current intensity circulates therein and operates a visual and/or acoustic alarm in the relay (10) and a visual and/or acoustic alarm in the control room of the plant.
  • the pressure moves the piston (12) and the screw (14) gets in icontact with the bracket (16) : the same by-pass (15) is closed and the above visual and/or acoustic alarms are operated.
  • the piston (12) carries an 0-ring (19) which reduces the friction between the piston (12) itself and the internal wall of the tube (11), when moving due to the presence of gas from leakage.
  • a resistance (20) as part of the circuit (6) that, in normal conditions, njtaintains said circuit (6) closed, with an operated visual signal in the relay (10), for example, a bulb (21)).
  • a bulb (21) This corresponds to the situation of the left circuit of Figure 5.
  • the same Figure 5 clearly indicates the circuit in the presence of a leakage (central circuit) by lightening of a bulb (22) and even (right circuit) the breaking of the electric wire by lightening of bulb (23) (autotest of the circuit (6)).
  • a similar test concerning the circuit (6) can be effected by intentionally closing the by-pass (15) from the control board (9).
  • the bulbs (21) , (22) and (23) have convenient different colours.
  • These signals can all be transferred to the control board (9) by means of the electric/electronic circuit (8) and transformed in visual and/or acoustic signals.
  • the detector box (4) preferably, may be made from hard plastic material.
  • the solenoid (24) can be operated from the control board (9) and the piston (12) moved against the
  • the hole (26) suitably located on the small pipe (11) , provides the discharge of the fluid into the detector box (4) and therefrom to the atmosphere through the safety plug (27) positioned in the bottom part of said box, to prevent overpressure therein.
  • the detector box (4) may be installed with the tube (11) in vertical position as well as in horizontal position. This possibility may be convenient, should the detecting and monitoring system of the invention be installed in an existing equipment and the room around the equipment be rather small.
  • the detecting and monitoring system object of the present invention was tested in equipment of an existing urea plant having the capacity of 1,500 T/D.
  • a urea plant is composed by several sections characterized py different operating conditions: pressure, temperature and composition of fluids.
  • the electric wire (13) of the circuit (6) is made from the same corrosion resistant material to avoid corrosion also
  • monitoring system of the invention resulted to be very sensitive and reliable, practically free from operating and maintenance costs and without any comsumption of reagents. Furthermore the duty of the operators to check all the ⁇ eep-holes was practically reduced to zero.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un système automatique hautement sensible et fiable qui permet de détecter et surveiller les fuites de liquides dans des appareils haute pression pourvus d'un revêtement intérieur anticorrosion. Ce système comporte des détecteurs reliés électriquement à des relais au moyen desquels les alarmes acoustiques et/ou visuelles sont correctement activées.
PCT/IB2002/003095 2001-09-13 2002-08-05 Systeme automatique de detection et de surveillance des fuites dans des appareils haute pression WO2003023351A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2001A001915 2001-09-13
IT2001MI001915A ITMI20011915A1 (it) 2001-09-13 2001-09-13 Sistema automatico per il rilevamento ed il monitoraggio di perdite in apparecchiature ad alta pressione

Publications (1)

Publication Number Publication Date
WO2003023351A1 true WO2003023351A1 (fr) 2003-03-20

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Application Number Title Priority Date Filing Date
PCT/IB2002/003095 WO2003023351A1 (fr) 2001-09-13 2002-08-05 Systeme automatique de detection et de surveillance des fuites dans des appareils haute pression

Country Status (2)

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IT (1) ITMI20011915A1 (fr)
WO (1) WO2003023351A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102384822A (zh) * 2010-09-06 2012-03-21 贵州金赤化工有限责任公司 用于监测尿素高压设备检漏管的检测装置
WO2013000565A1 (fr) * 2011-06-30 2013-01-03 Sartorius Stedim Biotech Gmbh Procédé et dispositif de contrôle de réservoirs de bioréacteur et utilisation associée
US9739546B2 (en) 2010-10-22 2017-08-22 Alfa Laval Corporate Ab Heat exchanger plate and a plate heat exchanger with insulated sensor internal to heat exchange area

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19740340A1 (de) * 1997-09-13 1998-10-01 Werner Doering Automatische Kontrolleinrichtung für Leckdiagnosesystem

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19740340A1 (de) * 1997-09-13 1998-10-01 Werner Doering Automatische Kontrolleinrichtung für Leckdiagnosesystem

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102384822A (zh) * 2010-09-06 2012-03-21 贵州金赤化工有限责任公司 用于监测尿素高压设备检漏管的检测装置
US9739546B2 (en) 2010-10-22 2017-08-22 Alfa Laval Corporate Ab Heat exchanger plate and a plate heat exchanger with insulated sensor internal to heat exchange area
WO2013000565A1 (fr) * 2011-06-30 2013-01-03 Sartorius Stedim Biotech Gmbh Procédé et dispositif de contrôle de réservoirs de bioréacteur et utilisation associée
EP2952867A1 (fr) * 2011-06-30 2015-12-09 Sartorius Stedim Biotech GmbH Procede et dispositif de controle pour recipient de bioreacteur
US9534980B2 (en) 2011-06-30 2017-01-03 Sartorius Stedim Biotech Gmbh Test method and apparatus for bioreactor containers having reception sheet clamped between bioreactor container and bioreactor container compartment

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Publication number Publication date
ITMI20011915A1 (it) 2003-03-13
ITMI20011915A0 (it) 2001-09-13

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