Tiberiu GYONGYOŞI


32-100 ELEMENTE DE CALCUL AL NECESARULUI DE AZOT PENTRU IZOLAREA CU DOP DE GHEAȚĂ A UNEI CONDUCTE ORIZONTALE DE DIAMETRU MARE

COMPUTATIONAL ELEMENTS FOR THE REQUIRED NITROGEN DURING THE ICE PLUG ISOLATION OF A HORIZONTAL HIGH DIAMETER PIPE-LINE
The technique of forming controlled ice plugs in pipe-line installations in order to isolate a section from the rest of the circuit is used for carrying out circuit maintenance or repair activities without shutting down the entire installation. Considering the results from a controlled test that has been carried out on a horizontal 300 mm nominal diameter pipe-line section, we elaborated a calculation model to reveal the quantity of required liquid nitrogen. It resulted consumption 50 % higher than the actual one. The difference comes from the approximations made for the ice plug dimensions in each stage of the process.
The paper then describes the convenience of visualizing the formation of ice plugs by studying the formation of the ice layers on the pipe inner wall.
Keywords: isolating a pipe-line section, visualizing the forming of ice layers
Cuvinte cheie: izolarea unui tronson de conductă, vizualizarea depunerii de gheaţă

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29-67 O ÎNCERCARE DE OBTURARE CU DOP DE GHEAŢĂ A UNUI TRONSON DE CONDUCTĂ ORIZONTALĂ (DN 300 mm) STRĂBĂTUT DE APĂ DEMINERALIZATĂ

A CONTROLLED ICE PLUG FORMING EXPERIMENT
CONDUCTED ON A HORIZONTAL PIPE SECTION (NPS 12)
WITH DEMINERALIZED WATER FLOWING THROUGH
In a hydraulic pipe-line installation, isolating a horizontal section
requires forming one or two ice plugs in a controlled process. This technique is
used for carrying out circuit maintenance or component replacements without
shutting down the entire installation. In both cases, the ice plug (or both ice
plugs) must be maintained until completing the repair activities. This paper
describes an experiment conducted on a horizontal NPS 12 horizontal pipe
section and its sequences, followed by the results and conclusions. The paper
is dedicated to specialists working in research and technological engineering.
Key words: cutting-off the flow, ice deposit, demineralised water,
hydraulic resistance
Cuvinte cheie: oprirea curgerii, depunere de gheaţă, apă
demineralizata, rezistenţa hidraulică

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28-48 OPORTUNITATEA VIZUALIZĂRII FORMĂRII CONTROLATE A DOPULUI DE GHEAŢĂ PE UN TRONSON DE CONDUCTĂ ORIZONTALĂ

THE CONVENIECE OF VISUALISING THE CONTROLLED FORMATION OF ICE PLUGS IN HORIZONTAL PIPE-LINE SECTION
The technique of forming controlled ice plugs in pipe-line installations in order to isolate a section from the rest of the circuit is used for carrying out circuit maintenance or repair activities without shutting down the entire installation. The geometrical characteristics of the ice plug can vary from one test to another, depending on the conditions under which the test is being carried out and the events that occur during this time. Studying this process requires visualizing the forming of ice layers inside the pipe.
This paper describes the convenience of visualizing the formation of ice plugs by studying the effect of the events and interventions that occur during controlled tests that have been carried out in horizontal pipe-line sections.
Key words: isolating a pipe-line section, visualizing the forming of ice layers
Cuvinte cheie: izolarea unui tronson de conductă, vizualizarea depunerii de gheaţă

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26-65 ÎNCERCĂRI DE FORMARE DOP DE GHEAŢĂ PE UN TRONSON DE CONDUCTĂ ORIZONTALĂ (cu Dn 200 mm) STRĂBĂTUT DE APĂ POTABILĂ

ATTEMPTS TO FORM ICE PLUG ON DRINKING/POTABLE WATER FLOWING THROUGH HORIZONTAL PIPE SECTION (of 200 mm nominal diameter)
In the hydraulic pipe-line installation, the cutting-off flow technique on a line (horizontal pipe) assumes to form an ice plug under controlled process or two ice plugs, for its isolation. On both cases the ice plug (or both ice plugs) is maintaining until completion of the maintenance / repair works made in circuit without shut-down installation. The paper describes a constructive and functional description of the experimental technological facilities followed by few sequences chosen from two tests carried out for potable water, and finally, the results and conclusions get. The paper is dedicated to specialist working in the research and technological engineering.
Keywords: cutting-off the flow, ice deposit, potable/drinking water, hydraulic resistance

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20-44 TEHNOLOGIE DE EVALUARE EXPERIMENTALĂ A REZISTENŢEI MECANICE LA SARCINI DE COMPRESIUNE A FASCICULULUI COMBUSTIBIL EXPERIMENTAL TIP CANDU

TECHNOLOGY FOR EXPERIMENTAL EVALUATION
OF THE MECHANICAL COMPRESSION RESISTANCE
AT CANDU TYPE FUEL BUNDLE
The paper is referring to the test technology evolution of CANDU
experimental fuel bundle at the Institute for Nuclear Research Piteşti. The outof-
reactor test rig and the special devices for evaluation of the nuclear fuel
mechanical resistance performance at compression loads, using light water at
representative parameters (pressure, temperature and flow rate) for CANDU 6
reactor operating conditions, are described.
This paper describes the original improvements implemented and
practically applied to mechanical resistance of carrier fuel bundle validation
technology. Some results and conclusions are presented at the end.
Keywords: strength, loop testing, simulation stops, fuel transporter beam
Cuvinte cheie: rezistenţă mecanică, bucla de testare, simulator
opritori, fascicul combustibil transportor

44 TEHNOLOGIE DE EVALUARE EXPERIMENTALĂ


24-54 O ÎNCERCARE DE FORMARE DOP DE GHEAŢĂ PE UN TRONSON DE CONDUCTĂ ORIZONTALĂ ÎNTR-O BUCLĂ HIDRAULICĂ EXPERIMENTALĂ DE JOASĂ PRESIUNE

AN ATTEMPT TO FORM AN ICE PLUG ON HORIZONTAL
PIPE SECTION INTO LOW PRESSURE HYDRAULIC
EXPERIMENTAL LOOP
In the pipe-line installation, using fluids in liquid state at maximum
temperature of 30°C, the ice plugging technique assumes to form an ice plug
under controlled process inside of horizontal pipe line. The ice plug is
maintaining until completion of the maintenance / repair works made in circuit
without shut-down installation. Development of such applications by the
Institute for Nuclear Research assumes to perform design works, elaboration
and qualification of fabrication/ testing technology for some applications
considered as representatives and accumulation of experience required for
handling at detail level of ice plug primary forming and local extension for few
flow agent types used in domestic and industrial installations.
The paper describes a constructive and functional description of the
experimental technological facilities. The first results and some conclusions are
presented. The paper is dedicated to specialist working in the research and
technological engineering.
Cuvinte cheie: oprirea curgerii, dispozitiv de formare dop de gheaţă,
apă demineralizată, transfer de masă
Key words: cutting-off the flow, ice plugging device, demineralised
water, mass transfer

54 O ÎNCERCARE DE FORMARE DOP DE GHEAŢĂ


21-50 TEHNOLOGIE DE EVALUARE EXPERIMENTALĂ A REZISTENŢEI MECANICE LA SARCINI DE IMPACT A FASCICULULUI COMBUSTIBIL EXPERIMENTAL TIP CANDU

TECHNOLOGY FOR EXPERIMENTAL EVALUATION OF THE
MECHANICAL COMPRESSION RESISTANCE AT IMPACT
LOAD ON CANDU TYPE FUEL BUNDLE
The paper is referring to the test technology evolution of CANDU
experimental fuel bundle at the Institute for Nuclear Research Piteşti. The outof-
reactor test rig and the special devices for evaluation of the nuclear fuel
mechanical resistance performance at dynamic impact load, using light water at
representative parameters (pressure, temperature and flow rate) for CANDU 6
reactor operating conditions, is described.
This paper describes the original improvements implemented and
practically applied to mechanical resistance of carrier fuel bundle validation
technology. Some results and conclusions are presented at the end.
Cuvinte cheie: impact, buclă de testare, simulator adaptor combustibil,
fascicul combustibil de testare, fascicul combustibil transportor
Keywords: impact, loop test, simulator adapter fuel, fuel bundle
testing, fuel transporter beam

50 TEHNOLOGIE DE EVALUARE EXPERIMENTALĂ