DK145144B - LOW TEMPERATURE STORAGE WITH BREAK DETECTION EQUIPMENT - Google Patents

LOW TEMPERATURE STORAGE WITH BREAK DETECTION EQUIPMENT Download PDF

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Publication number
DK145144B
DK145144B DK333074AA DK333074A DK145144B DK 145144 B DK145144 B DK 145144B DK 333074A A DK333074A A DK 333074AA DK 333074 A DK333074 A DK 333074A DK 145144 B DK145144 B DK 145144B
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Prior art keywords
low temperature
layer
detection equipment
container
temperature storage
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DK333074AA
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Danish (da)
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DK145144C (en
DK333074A (en
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K Katsuta
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Mitsubishi Heavy Ind Ltd
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Classifications

    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/04—Vessels not under pressure with provision for thermal insulation by insulating layers
    • F17C3/06—Vessels not under pressure with provision for thermal insulation by insulating layers on the inner surface, i.e. in contact with the stored fluid
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F17C13/126—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for large storage containers for liquefied gas
    • 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
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • 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
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0147—Shape complex
    • F17C2201/0157—Polygonal
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F17C2203/0333—Polyurethane
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0639—Steels
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, 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
    • F17C2260/03—Dealing with losses
    • F17C2260/035—Dealing with losses of fluid
    • F17C2260/038—Detecting leaked fluid

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Closures For Containers (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Examining Or Testing Airtightness (AREA)

Description

(19) DANMARK (®)(19) DENMARK (®)

6 (12) FREMLÆGGELSESSKRIFT (n> 1 i+51 Ui+ B6 (12) PRESENTATION SCRIPT (n> 1 i + 51 Ui + B

DIREKTORATET FOR PATENT- OG VAREMÆRKEVÆSENETDIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Ansøgning nr. (51) lnt.CI.3 F 17 C 3/02 (22) Indleveringsdag 20. jun. 197^· 801 N 23/18 (24) Løbedag 20. jun. 197^ (41) Aim. tilgængelig 2J. dec. 197^ (44) Fremlagt 1^· sep. 1982 (86) International ansøgning nr.(21) Application No. (51) lnt.CI.3 F 17 C 3/02 (22) Filing date 20 Jun. 197 ^ · 801 N 23/18 (24) Race day 20 Jun. 197 ^ (41) Aim. available 2J. December 197 ^ (44) Presented 1 ^ · sep. 1982 (86) International application no.

(86) International indleveringsdag (85) Videreførelsesdag -(62) Stamansøgning nr. -(86) International filing day (85) Continuation day - (62) Master application no. -

(30) Prioritet 22. Jun. 1972, 70552/72, JP(30) Priority 22 Jun. 1972, 70552/72, JP

(71) Ansøger MITSUBISHI JUKOGYO KABUSHIKI KAIS HA, Tokyo, JP.(71) Applicant MITSUBISHI JUKOGYO KABUSHIKI KAIS HA, Tokyo, JP.

(72) Opfinder Kihei Katsuta, JP.(72) Inventor Kihei Katsuta, JP.

(74) Fuldmægtig Ingeniørfirmaet Lehmann & Ree.(74) Associate Engineer Lehmann & Ree.

<54) Opbevaringsbeholder for væske ved lav temperatur med bruddetekterings« udstyr.<54) Low Temperature Liquid Storage Container with Break Detection Equipment.

Den foreliggende opfindelse angår en opbevaringsbeholder for væske ved lav temperatur og med bruddetekteringsudstyr, i hvilken beholder der på indersiden af beholdervæggen er anbragt mindst ét varmeisolerende lag og mindst ét uigennemtrængeligt lag lamineret til hinanden.The present invention relates to a low temperature liquid storage container with fracture detection equipment in which at least one heat insulating layer and at least one impervious layer are laminated to each other on the inside of the container wall.

Tidligere har det været yderst vanskeligt at finde bruddannelser i det uigennemtrængelige lag på indersiden af væggen i en opbevaringsbeholder for væske ved lav temperatur med indvendig -~"f" _;j- varmei solat ion. I sådanne tilfælde, hvor der tilvejebringes et uigennemtrængeligt lag af tynd metalplade på den inderste side af j· det indvendige varmeisolerende lag, dannes der mellem det uigennem- ^ trængelige lag og det varmeisolerende lag et mellemrum, hvori der * ΩIn the past, it has been extremely difficult to find fractures in the impervious layer on the inside of the wall in a low temperature liquid storage container with internal - ~ solute ion. In such cases, where an impermeable sheet of thin metal sheet is provided on the inner side of the inner heat-insulating layer, a gap is formed between the impermeable layer and the heat-insulating layer.

2 U51M2 U51M

indføres en gas, såsom ammoniak, og langs det uigennemtrængelige . metallags søm påføres der en detekteringsvæske, således at et eventuelt tilstedeværende brud i sømmen kan detekteres ved hjælp af detekteringsvæsken.a gas such as ammonia is introduced and along the impermeable. a metal layer seam is applied to a detection fluid so that any breakage present in the seam can be detected by means of the detection fluid.

Anvendelse af et tyndt metallag som uigennemtrængeligt lag er økonomisk ufordelagtigt, og såfremt der dannes et mellemrum mellem det tynde metallag og det varmeisolerende lag, kan det tynde metallag gå i stykker på grund af den bevægelse af væsken ved lav temperatur i beholderen, som skibets rulning forårsager. For at undgå dette er det blevet foreslået i stedet for det tynde metallag at tilvejebringe et uigennemtrængeligt lag bestående af et syntetisk plastlag og en metalfolie, der anbringes i nær berøring med overfladen af det varmeisolerende lag, eller at tilvejebringe et sekundært, uigennemtrængeligt lag i det indre af det varmeisolerende lag.The use of a thin metal layer as impermeable layer is economically disadvantageous and if a gap is formed between the thin metal layer and the heat insulating layer, the thin metal layer may break due to the low temperature movement of the vessel as the ship's rolling. causes. To avoid this, it has been suggested, instead of the thin metal layer, to provide an impermeable layer consisting of a synthetic plastic layer and a metal foil which is in close contact with the surface of the heat insulating layer, or to provide a secondary, impervious layer in it. interior of the heat insulating layer.

Med et sådant uigennemtrængeligt lag opstår imidlertid vanskeligheder, idet bestemmelse af brud (heri indbefattet småhuller) er særdeles vanskeligt.However, with such an impermeable layer, difficulties arise as the determination of fractures (including small holes) is extremely difficult.

Den foreliggende opfindelse har til formål at overvinde vanskelighederne i forbindelse med de kendte opbevaringsbeholdere for væske ved lav temperatur og tilvejebringe en ny og anvendelig opbevaringsbeholder for væske ved lav temperatur med bruddetekteringsudstyr, hvormed detektering af eventuelle brud i beholderens uigennemtrængelige lag let og præcist kan gennemføres.The present invention aims to overcome the difficulties associated with the prior art low temperature liquid storage containers and to provide a new and useful low temperature liquid storage container with fracture detection equipment which allows easy and accurate detection of any fractures in the container's impervious layer.

Dette formål opnås med en opbevaringsbeholder af den i indledningen omtalte art, hvilken beholder er ejendommelig ved, at bruddetekteringsudstyret omfatter en flerhed af hermetisk lukkede radioisotopkilder, der er fastgjort til indersiden af beholdervæggen i indbyrdes afstand fra hinanden.This object is achieved with a storage container of the kind mentioned in the introduction, the container being characterized in that the fracture detection equipment comprises a plurality of hermetically sealed radioisotope sources attached to the inside of the container wall at a distance from one another.

Med opbevaringsbeholderen for væske ved lav temperatur med det ovenfor beskrevne bruddetekteringsudstyr ifølge opfindelsen kan ethvert brud i det uigennemtrængelige lag bestemmes præcist ved at måle radioisotopens emissivitet fra tankens indre som følge af, at en flerhed af hermetisk lukkede radioisotopkilder er tilvejebragt fordelt over tankvæggens indre overflade.With the low temperature liquid storage container with the above-described fracture detection equipment of the invention, any fracture in the impermeable layer can be accurately determined by measuring the radioisotope emissivity from the interior of the tank as a plurality of hermetically sealed radioisotope sources are provided over the tank wall surface.

Eftersynet efter revner i hver af de uigennemtrængelige lag på indersiden af tankvæggen i en opbevaringsbeholder for væske ved lav temperatur med indvendig varmeisolering kan således gennemføres hurtigt og præcist, hvorved beholderens sikkerhed forbedres betydeligt.Thus, the check for cracks in each of the impermeable layers on the inside of the tank wall in a low temperature liquid storage container with internal heat insulation can be accomplished quickly and accurately, greatly improving the container's safety.

3 1451U3 1451U

Opfindelsen vil nu blive beskrevet nærmere under henvisning til tegningen, hvor: fig. 1 er et skematisk tværsnit, der viser skroget af et skib, hvori der er anbragt en opbevaringsbeholder for gas, som er gjort flydende ved lav temperatur, hvilken beholder er forsynet med bruddetekteringsudstyr ifølge den foreliggende opfindelse; fig. 2 er et delbillede i tværsnit i forstørret målestok, der i detailler viser en del af opbevaringsbeholderen ifølge fig. 1 for gas, der er gjort flydende ved lav temperatur; fig. 3 er et diagram, der viser resultaterne af måling af strålingsemissiviteten ved de på fig. 2 viste forhold; og fig. 4 er et delbillede i tværsnit, der mere detailleret viser opbygningen af den indenfor cirklen Ag på fig. 2 viste radioisotopkilde.The invention will now be described in more detail with reference to the drawing, in which: FIG. 1 is a schematic cross-sectional view showing the hull of a ship in which a low temperature liquid gas storage container is provided which is equipped with fracture detection equipment in accordance with the present invention; FIG. 2 is an enlarged cross-sectional view showing in detail a portion of the storage container of FIG. 1 for low temperature liquefied gas; FIG. 3 is a diagram showing the results of the measurement of the radiation emissivity of the 2; and FIG. 4 is a cross-sectional view showing in greater detail the structure of the circle Ag in FIG. 2 shows the radioisotope source.

Idet der nu henvises til fig. 1, er der tilvejebragt et primært, uigennemtrængeligt lag 3 af et lavtemperaturresistent materiale på indersiden af beholdervæggen 1, der udgør skroget, idet et varmeisolerende lag 2 af et materiale, såsom opskummet plast, er indlejret mellem beholdervæggen 1 og laget 3. Ballastbeholdere B er tilvejebragt ved begge skibssider og ved skibets bund. Rummet L anvendes til opbevaring af væsken ved lav temperatur.Referring now to FIG. 1, there is provided a primary impermeable layer 3 of a low temperature resistant material on the inside of the container wall 1 constituting the hull, a heat insulating layer 2 of a material such as foamed plastic being embedded between the container wall 1 and the layer 3. Ballast containers B are provided at both ship sides and at the bottom of the ship. The space L is used for storing the liquid at low temperature.

På fig. 2 er yderligere vist et sekundært, uigennemtrængeligt lag 4, som er tilvejebragt i det indre af det varmeisolerende lag 2, der befinder sig mellem beholdervæggen 1 og det indre, primære, uigennemtrængelige lag 3.In FIG. 2, a secondary impermeable layer 4 is further provided, which is provided in the interior of the heat insulating layer 2, which is between the container wall 1 and the inner primary, impervious layer 3.

Som det ejendommelige ved den foreliggende opfindelse er en flerhed af hermetisk lukkede radioisotopkilder 5 (hvoraf kun én er vist på fig. 2) fastgjort til den indvendige overflade af beholdervæggen 1 i en vis afstand fra hinanden.As is the characteristic of the present invention, a plurality of hermetically sealed radioisotope sources 5 (only one of which is shown in Fig. 2) are attached to the inner surface of the container wall 1 at some distance from one another.

Det varmeisolerende lag 2 er opdelt i et primært varmeisolerende lag 2a og et sekundært varmeisolerende lag 2b ved hjælp af det sekundære, uigennemtrængelige lag 4. Hvad angår det materiale, lag som disse varmeisolerende/2a og 2b er fremstillet af, kan et materiale med gode varmeisolerende egenskaber, såsom hård polyurethan-skum, polystyrenskum og polyethylenskum, anvendes.The heat-insulating layer 2 is divided into a primary heat-insulating layer 2a and a secondary heat-insulating layer 2b by means of the secondary, impermeable layer 4. As to the material of which the layers of these heat-insulating / 2a and 2b are made, heat insulating properties such as hard polyurethane foam, polystyrene foam and polyethylene foam are used.

4 145U44 145U4

Som materiale til fremstilling af beholdervæggen 1 kan anvendes almindeligt stål til skibsbygning, som ikke er lavtemperaturresistent. Hvad angår materialet til dannelse af det primære, uigennemtrængelige lag 3 og det sekundære, uigennemtrængelige lag 4, må der imidlertid anvendes et sammensat materiale, der er resistent ved lav temperatur, såsom et materiale, der forhandles under betegnelsen "Aluminilar", som indeholder metalfolier af stor bearbejdelighed og med lav gaspermeabilitet, såsom aluminiumfolier lamineret med polyesterplast eller et sammensat materiale med glasfibre eller carbonfibre kombineret med polyurethanplast, epoxyplast, silicone-plast eller polytetrafluorethylen eller tetrafluorethylen copolymer.As a material for making the container wall 1, ordinary steel can be used for shipbuilding which is not low temperature resistant. However, with respect to the material for forming the primary impervious layer 3 and the secondary impervious layer 4, a composite material which is resistant to low temperature, such as a material sold under the designation "Aluminum", which contains metal foils, must be used. of high workability and low gas permeability, such as aluminum foil laminated with polyester resin or a composite material with glass or carbon fibers combined with polyurethane resin, epoxy resin, silicone resin or polytetrafluoroethylene or tetrafluoroethylene copolymer.

Idet der nu henvises til fig. 4, er den hermetisk lukkede radioisotopkilde 5 fastgjort til den indvendige overflade af beholdervæggen 1 ved hjælp af et bindemiddel 6 og anbragt i en udsparing i det andet varmeisolerende lag 2b. Den lukkede beholder 5a fremstillet af bly indeholder et vindue 5b, der åbner sig mod beholderens indre. En kapsel 5c er indesluttet i beholderen 5a, og en i forvejen fastlagt mængde af en radioisotop 5d (f.eks. cobolt 60) er hermetisk indesluttet i kapslen 5c.Referring now to FIG. 4, the hermetically sealed radioisotope source 5 is attached to the inner surface of the container wall 1 by means of a binder 6 and placed in a recess in the second heat insulating layer 2b. The closed container 5a made of lead contains a window 5b which opens to the interior of the container. A capsule 5c is enclosed in the container 5a and a predetermined amount of a radioisotope 5d (e.g. cobalt 60) is hermetically enclosed in the capsule 5c.

Når strålingsemissivitet fra kilden 5 måles fra beholderens indre ved det periodiske eftersyn ved hjælp af et passende instrument, såsom et dosimeter, fås de på fig. 3 viste resultater, hvis der findes brud som Cl og CII i de primære og sekundære, uigennemtrængelige lag 3 og 4 som vist på fig. 2. Ved bestemmelse af værdierne for toppene a og b på fig. 3 kan det afgøres, i hvilket af det primære, uigennemtrængelige lag 3 og det sekundære, uigennemtrængelge lag 4 bruddet findes, og derefter kan beliggenheden af bruddene Cl og CII let bestemmes geometrisk ved undersøgelse af beliggenhederne A og B på det primære, uigennemtrængelige lag 3.When radiation emissivity from the source 5 is measured from the interior of the container by the periodic inspection by a suitable instrument, such as a dosimeter, they are obtained in FIG. 3, if fractures such as C1 and CII are found in the primary and secondary impermeable layers 3 and 4 as shown in FIG. 2. In determining the values of the peaks a and b of FIG. 3, it can be determined in which of the primary impervious layer 3 and the secondary impervious layer 4 the fracture is found, and then the location of the fractures C1 and CII can be easily determined geometrically by examining the locations A and B of the primary impervious layer 3. .

Den ovenfor beskrevne undersøgelse for brud kan gennemføres ved beholderens fremstilling. Eftersynet for brud skal gennemføres på det tidspunkt, hvor det sekundære, uigennemtrængelige lag 4 er blevet færdiggjort og på det tidspunkt, hvor det primære, uigennemtrængelige lag 3 er blevet færdiggjort.The fracture study described above can be carried out in the container manufacture. The fracture inspection shall be carried out at the time of completion of the secondary impervious layer 4 and at the time of completion of the primary impervious layer 3.

Hvad angår den radioisotop, som indesluttes i kilden 5, anvendes fortrinsvis cobolt 60. Cobolt 60's halveringstid er 5,2 år, og idet det antages, at afskrivningsperioden for skibet med den ovenfor beskrevne opbevaringsbeholder for væske ved lav temperatur er 20 år, falder mængden af radioisotopen i kilden 5 kun til omkring 1/16, og da en radioisotopmængde på lpyc er tilstrækkelig til én kilde,For the radioisotope enclosed in source 5, cobalt 60 is preferably used. The half life of Cobolt 60 is 5.2 years, and assuming that the depreciation period of the ship with the above described low temperature liquid storage tank is 20 years, the amount decreases of the radioisotope in source 5 only to about 1/16, and since a radioisotope amount of lpyc is sufficient for one source,

DK333074A 1973-06-22 1974-06-20 LOW TEMPERATURE STORAGE WITH BREAK DETECTION EQUIPMENT DK145144C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7055273A JPS5020787A (en) 1973-06-22 1973-06-22
JP7055273 1973-06-22

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DK333074A DK333074A (en) 1975-02-24
DK145144B true DK145144B (en) 1982-09-13
DK145144C DK145144C (en) 1983-02-14

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JPS544479B2 (en) * 1974-02-09 1979-03-07
JPS56132550A (en) * 1980-03-21 1981-10-16 Nippon Steel Corp Diagnostic method for deterioration of insulation for winding of electric machine
FR2515347A1 (en) * 1981-10-26 1983-04-29 Nguyen Tan Chuong Crack detection, esp. in wall of tanker ship carrying liq. methane - where gases are fed through cavities in wall while telemeter makes thermal and gamma ray maps of wall
JPH0740826Y2 (en) * 1989-06-19 1995-09-20 株式会社プランテック Vertical incinerator with gas rectifier
JPH0730905B2 (en) * 1991-09-09 1995-04-10 株式会社ジェット炉 Incinerator

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US2518327A (en) * 1947-01-20 1950-08-08 Bell Telephone Labor Inc Method and means for detecting leaks in lead sheath telephone cables
US2674695A (en) * 1950-07-27 1954-04-06 Sun Oil Co Determination of level of a body of material in a vessel
US2794953A (en) * 1954-02-25 1957-06-04 Budd Co Method and apparatus for testing wall continuity by capacitance alteration
US3439166A (en) * 1964-11-04 1969-04-15 Industrial Nucleonics Corp Measuring ablation shield thickness
US3531638A (en) * 1965-10-23 1970-09-29 Industrial Nucleonics Corp Radiation fill gauge
JPS4829484A (en) * 1971-08-20 1973-04-19

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CA1005375A (en) 1977-02-15
GB1442918A (en) 1976-07-14
US3916189A (en) 1975-10-28
BE816655A (en) 1974-10-16
FR2234514A1 (en) 1975-01-17
DE2429877B2 (en) 1976-02-19
FR2234514B1 (en) 1976-12-24
JPS5020787A (en) 1975-03-05
DK145144C (en) 1983-02-14
NO133511C (en) 1976-05-12
NO133511B (en) 1976-02-02
SE393862B (en) 1977-05-23
DE2429877A1 (en) 1975-01-16
DK333074A (en) 1975-02-24
NL7408425A (en) 1974-12-24
NO742250L (en) 1975-01-20
SE7407877L (en) 1974-12-23
ES427669A1 (en) 1976-09-01
IT1015284B (en) 1977-05-10

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