T OF D Who we ar e Co nve ntio na l a nd Oil a nd Ga s, Re - - PowerPoint PPT Presentation

ADVANCE UL T RASONIC INSPE CT ION

DAC O N INSPEC T IO N SERVIC ES

ADVANCE D UL T RASONIC INSPE CT ION

T OF D

Who we ar e

Co nve ntio na l a nd Adva nc e d NDT a nd Inspe c tio n Se rvic e s Oil a nd Ga s, Re fine ry, Pe tro c he mic a l, He a vy Industry, Mining Ove r 400 pe rso nne l inc luding mo re tha n 300 inspe c to rs T ha ila nd he a dq ua rte rs with Inte rna tio na l e xpe rtise sinc e 1979

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Ope r ational E xc e lle nc e - Our Custome r s

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advanc e d Ultr asonic Inspe c tion T OF D

• T

OF D = T ime of F light Diffr ac tion

• Was or

iginally de signe d for ac c ur ate sizing of flaws in nuc le ar industr y

• Was found that the te c hnique is also e ffe c tive for

de te c tion of flaws in we lds

• Use s the diffr

ac te d sound whic h initiate s at flaw tips whe n a flaw is “hit” by a wide UT be am

• F

laws c an be de te c te d r e gar dle ss of the or ie ntation of the flaw

• Use s longitudinal sound

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Pr inc iple of Diffr ac tion

Advanc e d Ultr asonic Inspe c tion T OF D

Diffra c te d UT sig na ls c a n b e c o mpa re d to the wa ve s tha t will o c c ur a ro und the e nd s o f a pie c e o f wo o d flo a ting in wa te r whe n it is hit b y inc o ming wa ve s

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Pr inc iple of Diffr ac tion

Advanc e d Ultr asonic Inspe c tion T OF D

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

• 2 Pr
• be s opposite e ac h othe r

.

• 1 tr

ansmitting and 1 r e c e iving the signals

Advanc e d Ultr asonic Inspe c tion T OF D

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

• Use longitudinal sound
• T

r ansduc e r s with a high band width ar e use d to flood as muc h of the mate r ial thic kne ss, r e sulting in good c ove r age

Advanc e d Ultr asonic Inspe c tion T OF D

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advanc e d Ultr asonic Inspe c tion T OF D

A- sc an pr e se ntation of the T OF D signal

• L

ate r al wave

• Bac k wall e c ho
• Mode c onve r

te d (she ar wave s)

L ate r al

T x Rx

Bac k wall She ar

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advanc e d Ultr asonic Inspe c tion T OF D

A- sc an pr e se ntation of the T OF D signal, whe n de fe c t is pr e se nt

• L

ate r al wave

• Bac k wall e c ho
• De fe c t uppe r

tip signal

• De fe c t lowe r

tip signal

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advanc e d Ultr asonic Inspe c tion T OF D

T OF D sc an image pr e se ntation

• A- sc an ar

e stac ke d toge the r to for m a gr e y sc ale image

• T

he image give s a pr e se ntation similar to a r adiogr aph

(d iffe re nc e is tha t the we ld will b e “lo o ke d thro ug h” fo rm the sid e in ste a d o f the to p)

• 100%

+100%

L a te ra l wa ve (Sc a n Surfa c e ) Ba c kwa ll She a r mo de sig na ls fro m b a c kwa ll

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advanc e d Ultr asonic Inspe c tion T OF D

Ne ar Sur fac e Cr ac k

1 2

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advanc e d Ultr asonic Inspe c tion T OF D

Inc omple te Root Pe ne tr ation

1 2 3

1 2 3

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advantage s

• Ac c ura te Sizing
• No t d e pe nd e nt o n fla w o rie nta tio n
• Give s a pe rma ne nt re c o rd
• Re pe a ta b ility, g o o d fo r mo nito ring
• F

a st sc a nning a nd e a sy se t up

• No ra d ia tio n invo lve d

Disadvantage s

• Ha s a d e a d zo ne a t the inspe c tio n

surfa c e , le ss a pplic a b le o n thin wa ll

• No la te ra l po sitio n o f d e fe c t (tra nsve rse

po sitio n in the we ld)

• Re q uire s e xpe rie nc e d te c hnic ia n fo r

inte rpre ta tio n

• E

xisting c o d e s c a n no t a lwa ys b e a pplie d (so lve d b y ASME c c 2235 a nd 181)

Advanc e d Ultr asonic Inspe c tion

T OF D Adva nta g e s & Disa dva nta g e s

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

How Can We He lp?

Contac t

E ma il : info @ d a c o n-inspe c tio n.c o m Pho ne : +66 (0) 33 012 484-7

www.dac on- inspe c tion.c om