accoustic emmission testing presentation

7/25/2019 Accoustic Emmission Testing Presentation

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ACOUSTIC EMISSION TESTINGDURING HYDRO TEST

Presented by:

Dharmik P DaveIPT, NDE Department

L & T hazira, surat..


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What is ac ustic emissi n testin! "

Testin! the s undness # a materia$ %ith thehe$p # ac ustic emissi n is ca$$ed ac usticemissi n testin!.

c ustic emissi n testin! is ne type #n ndestructive testin!. Detectin! de#ects in pressure vesse$s %ithac ustic emissi n ' E( testin! is m stc mm n$y used in c n)uncti n %ith a hydro-test r durin! an n*$ine ver*pressurizati n


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DE+ENITI N + - /TI- E0I//I N /PE1 TE10IN L 23 + 1

N NDE/T1 -TI4E E5 0IN TI N/6 7The -$ass # Phen mena Whereby Transient

E$astic Waves re 2enerated 8y The 1apid1e$ease # Ener!y +r m L ca$ized / urcesWithin 0ateria$9


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ACOUSTIC EMISSION TESTING

6 The principa$ b)ective # E e aminati n is t$ cate and m nit r c ustic Emissi n s urces

caused by sur#ace r interna$ disc ntinuities inmateria$s.

6 E e aminati n %i$$ test the ;


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2enerati n # ac ustic si!na$s


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Termin $ !y # ac ustic emissi n testin! 'Parameters(


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Peak amp$itude * The maximum of AE si !a"

Durati n > The time from the first thresho"d

#rossi! to the e!d of the "ast thresho"d#rossi! $- unts > The !um%er of AE si !a" ex#eedsthresho"d .

Avera!e &re?uency > Determi!es the a'era efre(ue!#y in k@z ver the entire E hit.

1ise time * The time #r m the first thresho"d#rossi! to the maximum am)"itude . - unt rate * Number # c unts per time unit $

. [ ] AE counts

A F kHz

Duration

=


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6 The materia$ can be a s $id, $i?uid, !as rp$asma and the e terna$ stress can be app$iedmechanica$$y, therma$$y, ma!netica$$y, etc. inac ustic emissi n testin!.

6 e$astic %aves in s $ids are n t $imited tpressure %aves, and a$$ types # vibrati na$m des are !enerated by ac ustic emissi ns urces.


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*AISER E&&ECT IN - /TI- E0I//I NTE/TIN2

6 A seph Baiser %as ne # best scientist %h #inedBaiser E##ect n vesse$.

6 If a materia" is "oaded to a i'e! stress "e'e" a!dtha! u!"oaded+ usua""y !o emissio! ,i"" %eo%ser'ed u)o! immediate re"oadi! u!ti" the

)re'ious "oad has %ee! ex#eed$

6 c ustic emissi n !enerates under hi!h $ ad thanpervi us $ ad hist ry.


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6 n si!na$s %ere !enerated by a samp$e up nthe sec nd $ adin! unti$ the previ us ma imum

$ ad %as e ceeded, thatCs ca$$ed Baiser e##ect.6 In sh rt Baiser e##ect means a#ter a -yc$e %e

!ive $ ad n ne p$ace and indicate s me

indicati n.


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CASE STUDY ON ACOUSTICEMISSION TESTING DURING HYDRO

TEST ON GASI&IER REACTORDesi ! Data

6 Desi!n - de : sme /ec 4iii Div 6 Interna$ Pressure & Temp. : F B!G H J6 E terna$ Pressure & Temp. : +4 B!G H J6 pratin! Pressure :


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/-ET-@ + 2 /I+IE1 1E -T 1

N te : 0eans Where - ver .E.T.


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E?uipment s sed In c ustic Emissi nTestin! :

;. c ustic Emissi n Transducer ' M(. - up$ant : 2rease. 0 nit rin! /ystem Like - mputer

J. c ustic Emissi n -ab$es # r Trans#er /i!na$s

. ther /ma$$ ccess ries , Like Transducer /tand

T1 N/D -E1 - /TI- E0I//I N - 8LE


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+ LL /ET P + 1 - /TI- E0I//I NTE/TIN2


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W 1BIN2 P1 -ED 1E + 1 - /TI-E0I//I N TE/TIN2 :

6 +rist M .E.T. transducer set up d ne at every Jmeter distance n c ne area # !asi#ire e?uipment.Each transducer have capabi$ity t c ver the 0eterarea ar und it.


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/cannin! p rti n # c ne part # r !asi#ier react r


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6 In This 2asi#er 1eact r We @ave Per# rmed-a$ibrati n # .E.T With @e$p # Lead '


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6 In @ydr Testin! T% -yc$e # Pressure.6 +rist -yc$e /tart < B!G T M< B!G nd /ec nd

-yc$e /tart J B!G T M< B!G With @ $din! Times s Per Pr cedure.6 When start #irst cyc$e, ) b e pand and i# the any

disc ntinuity in the ) b s it a$s e panded and

reach its p$astic de# rmati n p int.


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.ressuri/atio! se(ue!#e as )er)ro#edure of 0 1 T

6 1 st Loading:0 to 50%, hold 10mins, 50 to 65% hold10mins, 65 to 85%, hold 10mins, 85 to100%, hold 30mins.

6 2 nd Loading:Vessel is then unloaded to 50% and re-pressurized as follows:At 50%, hold 10mins, 50 to 65%, hold10mins, 65 to 85%, hold 10mins, 85 to

8-100%, hold 30mins !"# $! $


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6 nd n te d %n in ac ustic emissi n system asa si!na$.

6 In #irst cyc$e %e ! t many n n re$evantindicati n because stress is pr duced in ) b.

6 #ter #irst cyc$e c mp$eted, d h $d and a#terh $din! re$ease pressure ti$$ J k!G


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6 #ter start sec nd cyc$e J k!G t M


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D4 NT 2E/ + ET

E can be used a$$ sta!es # testin! inc$udin! :6 In*service inspecti n6 Pre service inspecti n6 Leak detecti n and $ cati n

Less intrusive2$ ba$ m nit rin!1ea$ time eva$uati n


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LI0IT TI N + ETD $ar!e set*up be# re EE?uipment c st is hi!her than 0T and PT re?uired $ n! time c mpare t ther NDTmeth d $ike 0T, PT and TIt is / me time risky cause # hydr test anditCs pressure.@i!h ski$$ re?uire c mpare t 0T and PT

accoustic emmission testing presentation

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