WO2008067674A1 - Dispositif et système pour la détection de la corrosion - Google Patents

Dispositif et système pour la détection de la corrosion Download PDF

Info

Publication number
WO2008067674A1
WO2008067674A1 PCT/CA2007/002221 CA2007002221W WO2008067674A1 WO 2008067674 A1 WO2008067674 A1 WO 2008067674A1 CA 2007002221 W CA2007002221 W CA 2007002221W WO 2008067674 A1 WO2008067674 A1 WO 2008067674A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
probe
chamber
monitored
assembly
Prior art date
Application number
PCT/CA2007/002221
Other languages
English (en)
Inventor
John Aikens
Original Assignee
Centre For Nuclear Energy Research Inc.
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 Centre For Nuclear Energy Research Inc. filed Critical Centre For Nuclear Energy Research Inc.
Publication of WO2008067674A1 publication Critical patent/WO2008067674A1/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
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
    • G01M3/2869—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals for seals not incorporated in a pipe joint

Definitions

  • the present invention relates to a device and system for detecting corrosion.
  • the invention relates to a device and system for detecting corrosion which produces hydrogen as a by-product, such as in pipes containing oil and gas and in pipes experiencing flow-accelerated corrosion.
  • a device for monitoring gas effusing from a pipe comprising: a mounting assembly having an upper and lower bracket; a housing located on the upper bracket; the bottom of the housing is of a shape complementary to the pipe being monitored; a bore in the housing for receiving the probe assembly; the probe assembly comprising: a probe insert; a chamber for collecting gas in the bottom of the probe insert formed by side walls and an upper wall; a compressible sealing means in the bottom of the side walls for sealingly engaging the outer surface of the pipe to be monitored; a passageway in the probe [0004] insert, extending from an outlet at the top surface of the probe insert to an inlet in the upper wall of the chamber, such that the passageway is in flow communication with the chamber; a tube receivable through the outlet of the passageway; a plate removably connected to the housing for, securing the probe assembly in place; the plate comprising a biasing means for compressing the sealing means of the probe insert to engage the outer surface of
  • a device for monitoring gas effusing from a pipe comprising: a mounting assembly; a housing located on the mounting assembly; the bottom of the mounting is of a shape complementary to the pipe being monitored; a probe assembly; a bore in the housing for receiving the probe assembly; the probe assembly comprising: a probe insert; a chamber for collecting gas in the bottom of the probe insert formed by side walls and an upper wall; a compressible sealing means in the bottom of the side walls for sealingly engaging the outer surface of the pipe to be monitored; a passageway in the probe insert, extending from an outlet at the top surface of the probe insert to an inlet in the upper wall of the chamber, such that the passageway is in flow communication with the chamber; a tube receivable through the outlet of the passageway; a plate removably connected to the housing for, securing the probe assembly in place; the plate comprising a biasing means for compressing the sealing means of the probe disk to engage the outer surface of the pipe to be
  • a method for monitoring gas effusing from a pipe comprising the steps of: providing a gas collection chamber and placing the chamber on a pipe being monitored such that a substantially hermetic seal is formed between the chamber and the pipe; providing a vacuum means connected to the chamber; evacuating the chamber; taking a measurement of the amount of a gas in the chamber after a period of time after evacuation of the chamber.
  • the gas being measured is hydrogen.
  • FIG. 1 is an exploded view of a device embodying the invention
  • FIG. 2 is a front view of the device of Fig. 1 assembled
  • Fig. 3 is a cross-section of a section of the probe insert used in the device of Fig. 1;
  • FIG. 4 is a process schematic of a system incorporating the device of Fig.1;
  • FIG. 5 is an instrumentation schematic of a system incorporating the device of Fig. 1;
  • FIG. 6 is a front view of the device of Fig. 1 after installation on a pipe;
  • Fig. 7 is a cross-section exploded view of the probe insert and probe holder of the device of Fig. 1;
  • FIG. 8 is a top view of an alternative embodiment of the device of the present invention.
  • Fig. 9 is a side view of the device of Fig. 8.
  • a device measures the rate at which hydrogen effuses through a pipe as iron from the pipe is lost into solution as a consequence of corrosion.
  • a probe having a pressure chamber gas collection chamber
  • a vacuum is created within the chamber.
  • Hydrogen effusing from the pipe through the wall of the pipe covered by the chamber is trapped by the chamber thus resulting in a rise in pressure inside the chamber.
  • the rate of increase in pressure within the known volume of the chamber assembly is measured using a pressure sensor.
  • the probe and attached tubing is preferably constructed of silver to minimize the diffusion of captured hydrogen out from the internal volume of the equipment.
  • the probe is housed within a housing mounted on a mechanical clamp and secured using bolts.
  • the ridge of the silver probe is deformed against the pipe being monitored by the compressive force of the bolts, thus creating a vacuum seal and allowing measurements of hydrogen pressure to be taken by a pressure sensor.
  • a device includes a hydrogen effusion probe ("HEF') assembly indicated generally at 2 that is mountable on a pipe by a clamp assembly indicated generally at 4.
  • HEF' hydrogen effusion probe
  • Clamp assembly 4 includes lower clamping bracket 6 and upper clamping bracket 8, although it will be understood that the use of upper and lower are for ease of reference only and does not require that the lower clamping bracket 6 necessarily be located below the upper clamping bracket 8 when the device is installed on a pipe.
  • Lower bracket 6 is horseshoe shaped for placement around a pipe to be monitored.
  • Holes 14 are provided in flanges 10 and 12 for receiving a hinge pin 16 for pivotally attaching lower bracket 6 to upper bracket 8.
  • a second pair of spaced apart, of generally parallel flanges 18 and 20, are located at a second end of lower bracket 6. Holes 22 are provided in flanges 18 and 20 for receiving the pins 24 of a tee bolt 26.
  • the upper bracket 8 is also horseshoe shaped.
  • a flange 28 is located at a first end of upper bracket 8.
  • a hole 30 is provided in the flange 28 for receiving the pin 16.
  • a second pair of spaced apart, generally parallel flanges 32 and 34, are located at a second end of upper bracket 8 for receiving the threaded end 36 of tee bolt 26.
  • Housing 38 is located at the midsection of upper bracket 8.
  • the bottom 40 of housing 38 is arcuate to conform to the outer surface of a pipe being monitored and includes a bevelled edge 42 and the same on the opposite edge (not shown).
  • Central bore 44 through the housing 38 is provided for seating the HEP assembly 2 in the upper bracket 8.
  • Four threaded bores 46 are provided in the housing 38 for receiving bolts for securing the HEP assembly 2 in the housing 38.
  • HEP assembly 2 includes a disk shaped probe insert 48 which functions as a hydrogen gas collection system.
  • the probe insert 48 has a disk shaped body with a central passageway 50 having an outlet end indicated generally at 52. Passageway 50 narrows at seat 54 which defines inlet passageway 57 which connects passage way 50 to chamber 60. Chamber 60 is defined by annular sidewall 62 and an annular flange or ridge 64, and upper wall 66.
  • the probe insert 48 nests in the cavity 55 of the spacer 54 when assembled.
  • leading edge 68 of flange or ridge 64 is arcuate in cross section.
  • the arc of the edge 68 corresponds to the outer circumference of the pipe being monitored.
  • Probe insert 48 and tube 52a are preferably made of silver. Silver and gold exhibit a low hydrogen permeability including at higher temperatures. Steels exhibit low hydrogen permeability at lower temperatures and are suitable for devices operating at lower temperatures.
  • Tube 52a extends through probe holder (spacer) 54 and plate 56, preferably made of the same material as the pipe. Four holes 58 are provided in plate 56 for receiving screws or bolts 60 which together with compression washers 62, secure the HEP assembly 2 in housing 38.
  • the compression washers 62 bias the probe insert 48 toward contact with the pipe being monitored, such that ridge 64 is compressed and edge 68 forms a substantially hermetic seal with the outer surface of the pipe.
  • bracket 8 are pivotally connected to each other by placing the flange 28 of the upper bracket 8 between the flanges 10 and 12 of the lower bracket 6 and inserting the hinge pin 16 in holes 14 and 30.
  • the brackets 6 and 8 are placed around a pipe and locked in place by passing tee bolt 26 between flanges 32 and 34 and locking the tee bolt 26 with nut 70 and washer 72.
  • the probe insert 48 When the brackets 6 and 8 are locked around a pipe, the probe insert 48, being spring biased, adjusts position within the housing 38 such that a substantially hermetic seal is formed with the pipe being monitored.
  • the sealing means comprises the ridge 64 made of malleable silver which is compressed when pressed against the outer surface of the pipe being monitored.
  • the compression of the ridge 64 acts to mold the ridge to the outside of a being monitored (the pipe being made of a material that is harder than silver) the harder pipe thus forming a substantially hermetic seal.
  • the ridge 64 is shown in a compressed state against the pipe 100. The compression of the ridge 64 from a hermetic seal against the pipe.
  • the brackets 6 and 8 and housing 38 are preferably made of a material which has thermal expansion characteristics similar to the pipe being monitored.
  • the pipe being monitored is made of A106 Grade B carbon steel ASME SA516 Grade 70 carbon steel can be used for the clamps.
  • a system incorporating the HEP assembly 2 and brackets 6, 8 installed on feeder pipe 74 in a nuclear generating station includes a HEP instrumentation unit at 76 made by Hammond (Model IMEI668).
  • the unit 76 houses absolute pressure transducer 78, a data acquisition and control unit 80 and isolation value 82 valve 82 is connect to vacuum pump 84 with tubing 96.
  • the vacuum pump 84 is a two-stage, oil sealed, sliding vane pump manufactured by Edwards (Model E2M1.5), pumps down to an ultimate vacuum of 7.5 x 10-
  • the vacuum pump 84 exhaust is vented to the exterior of the unit 76. This minimizes the possibility of hydrogen build up inside the unit 76.
  • the absolute pressure transducer 78 is used to measure gas pressure in the chamber 60.
  • the transducer 78 is manufactured by MKS (Model MKS120AA- 1000RCJ) and has an accuracy of +/- 0.05% of reading over the full range of 0 to 1000 torr (133 kPa).
  • the isolation valve 82 is a "fail closed” electromagnetic valve (micro-EME part # 28444) manufactured by Leybold Vacuum.
  • the valve body is low volume to minimize the overall volume of the system and has a leak rate of 1 x 10" 9 mbar L/s.
  • the data acquisition and control unit 80 is based on OPTO22 SNAP
  • Ethernet I/O equipment The control system operates in 2 modes: manual and cycle.
  • a silver tube 84 is connected to the tube 52a.
  • Tube 84 runs from the HEP assembly 2 to stainless steel tube 86.
  • Swagelock VCR fitting 88 couples tube 84 to tube 86.
  • Tube 86 runs from fitting 88 to the unit 76 where it branches at junction 90 into tubes 92 and 94.
  • Tube 92 runs to the transducer 78 while tube 94 runs to valve 82.
  • Flexible tubing 96 connects valve 82 to vacuum pump 84.
  • the valve 82, the HEP insert 48 and the tubing 52, 84, 86, 92, 94 and 96 form a closed system for collecting hydrogen during system operation.
  • Thermocouple 96 is connected to the HEP 2 and by cable 98 to the control unit 80.
  • Thermocouples 100 and 102 are connected to tubes 84 and 86 respectively, along with thermocouple 104 are connected to the control unit 80 by cables 106, 108 and 110 respectively.
  • the thermocouples 96, 100, 102 and 104 measure temperature at the locations at which they are installed.
  • the vacuum pump 84 and isolation valve 82 are turned on/ open or off/ closed at the user's discretion, usually during installation and testing.
  • the data acquisition and control unit 80 controls the periodic venting of the system.
  • the vacuum pump 84 is first turned on to evacuate the chamber 60 within the HEP insert 48.
  • the valve 82 is then opened.
  • the valve 82 is then closed after the specified assembly evacuation time is completed, to maintain the vacuum in the system.
  • the vacuum pump 82 is then turned off and pressure is allowed to build as hydrogen effuses through the pipe and is collected in chamber 50 of the probe insert 48, to a predetermined pressure set point (eg. 2000 Pa absolute) or time set point (eg. 24 hours).
  • a predetermined pressure set point eg. 2000 Pa absolute
  • time set point eg. 24 hours
  • the data acquisition and control system collects data every 5 seconds, which can be retrieved and later analyzed offline. Data can be collected at other time intervals as required.
  • the data acquisition and control voltage input module has an accuracy of +/- 0.06%FS.
  • the accuracy for this application (0 to 2000 Pa) is +/- 0.2 Pa with the useable range of the I/O module selected to +/- 5V and the transducer set on the O.lx range.
  • the data acquisition system can further be supported by an air conditioner 112, monitor 114, keyboard and mouse 116, as well as an uninterrupted power supply (“UPS") 118 as shown in Fig. 5.
  • air conditioner 112 monitor 114
  • keyboard and mouse 116 keyboard and mouse 116
  • UPS uninterrupted power supply
  • the rate of hydrogen effusion can be determined by known methods by measuring the change in pressure of hydrogen that accumulates in the chamber 60, as shown in Fig. 3.
  • the pressure increase can be converted to a corrosion rate based on the surface area of the pipe undergoing corrosion in the HEP insert 48, the volume of the chamber 60, and the stoichiometry of the corrosion reactions.
  • the data acquisition and control unit 80 can be programmed accordingly.
  • Figs- 8 and 9 illustrate an alternate embodiment of the present invention, wherein the HEP assembly 2 is welded to a pipe being monitored. This welded embodiment is used in applications where the clamp embodiment described above cannot be used to attach the HEP assembly 2 to a pipe, such as on a pipe which is part of the water-wall of a boiler.
  • the stand-offs 102 hold a plate 104 which receives the HEP assembly 2.
  • the stand-offs 102 include bolts 106 which can be tightened to exert enough pressure to adequately deform the silver ridge 64.
  • the housing 38 and probe insert are substantially similar to the clamp embodiment and sit on the plate 104 supported by the stand-offs 102.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

L'invention concerne un dispositif pour le contrôle du gaz diffusant d'un tuyau, le dispositif comprenant un ensemble de montage doté d'un support supérieur et inférieur ; un boîtier situé sur le support supérieur ; la partie inférieure du boîtier étant d'une forme complémentaire à celle du tuyau contrôlé ; un ensemble formant sonde ; un alésage dans le boîtier pour recevoir l'ensemble formant sonde, ce dernier comprenant : un insert de sonde ; une chambre pour la collecte de gaz au fond de l'insert de sonde formée par des parois latérales et une paroi supérieure ; un moyen d'obturation compressible dans la partie inférieure des parois latérales pour venir en prise de manière étanche avec la surface extérieure du tuyau à contrôler ; une voie de passage dans l'insert de sonde, s'étendant depuis une sortie au niveau de la surface supérieure de l'insert de sonde vers une entrée dans la paroi supérieure de la chambre , de sorte que la voie de passage se trouve en communication fluidique avec la chambre ; un tuyau pouvant être reçu à travers la sortie de la voie de passage ; une plaque raccordée de manière amovible avec le boîtier pour fixer l'ensemble formant sonde en place ; la plaque comprend un moyen de sollicitation pour comprimer le moyen d'obturation du disque de la sonde pour venir en prise avec la surface externe du tuyau à contrôler pour former un joint sensiblement hermétique ; et le tube lorsqu'il repose au niveau de l'entrée de l'entrée du disque de la sonde s'étend à travers la plaque.
PCT/CA2007/002221 2006-12-08 2007-12-10 Dispositif et système pour la détection de la corrosion WO2008067674A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA 2570710 CA2570710A1 (fr) 2006-12-08 2006-12-08 Dispositif et systeme de detection de la corrosion
CA2,570,710 2006-12-08

Publications (1)

Publication Number Publication Date
WO2008067674A1 true WO2008067674A1 (fr) 2008-06-12

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WO (1) WO2008067674A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959014A1 (fr) * 2010-04-19 2011-10-21 Total Raffinage Marketing Suivi de la vitesse de corrosion d'un conduit metallique parcouru par un fluide corrosif
CN104007024A (zh) * 2014-06-10 2014-08-27 博益(天津)气动技术研究所有限公司 一种用于机翼油箱铆钉气密性检测的检测装置
WO2018144313A3 (fr) * 2017-01-31 2018-09-20 Saudi Arabian Oil Company Sonde de surveillance de croissance de hic in situ
EP3779398A4 (fr) * 2018-07-12 2021-12-08 Pureron Japan Co., Ltd. Dispositif de mesure de gaz dissous
ES2948721A1 (es) * 2023-07-28 2023-09-18 Grupo Mikalor Sl Abrazadera metalica con soporte para la fijacion externa de sondas de medicion en tuberias

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4040289A (en) * 1972-11-08 1977-08-09 Clark Joseph H Method and arrangement for air testing of sewer lateral connections
US5511573A (en) * 1994-10-24 1996-04-30 K N Energy, Inc. Contaminated valve containment device
US5594162A (en) * 1995-06-06 1997-01-14 Dolan; James P. Valve stem gas leak detector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4040289A (en) * 1972-11-08 1977-08-09 Clark Joseph H Method and arrangement for air testing of sewer lateral connections
US5511573A (en) * 1994-10-24 1996-04-30 K N Energy, Inc. Contaminated valve containment device
US5594162A (en) * 1995-06-06 1997-01-14 Dolan; James P. Valve stem gas leak detector

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959014A1 (fr) * 2010-04-19 2011-10-21 Total Raffinage Marketing Suivi de la vitesse de corrosion d'un conduit metallique parcouru par un fluide corrosif
WO2011131897A1 (fr) 2010-04-19 2011-10-27 Total Raffinage Marketing Suivi de la vitesse de corrosion d'un conduit metallique parcouru par un fluide corrosif
US9222871B2 (en) 2010-04-19 2015-12-29 Total Raffinage France Tracking of the rate of corrosion of a metal conduit traversed by a corrosive fluid
CN104007024A (zh) * 2014-06-10 2014-08-27 博益(天津)气动技术研究所有限公司 一种用于机翼油箱铆钉气密性检测的检测装置
WO2018144313A3 (fr) * 2017-01-31 2018-09-20 Saudi Arabian Oil Company Sonde de surveillance de croissance de hic in situ
US10866183B2 (en) 2017-01-31 2020-12-15 Saudi Arabian Oil Company In-situ HIC growth monitoring probe
US11630054B2 (en) 2017-01-31 2023-04-18 Saudi Arabian Oil Company In-situ HIC growth monitoring probe
EP3779398A4 (fr) * 2018-07-12 2021-12-08 Pureron Japan Co., Ltd. Dispositif de mesure de gaz dissous
ES2948721A1 (es) * 2023-07-28 2023-09-18 Grupo Mikalor Sl Abrazadera metalica con soporte para la fijacion externa de sondas de medicion en tuberias

Also Published As

Publication number Publication date
CA2570710A1 (fr) 2008-06-08

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