(PE C) S FO R A LL YO UR INSPEC TIO N NEED S DACON INSPE CT ION - - PowerPoint PPT Presentation

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

DAC O N INSEPEC T IO N SERVIC ES

PUL SE D E DDY CURRE NT

(PE C)

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

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

PUL SE D E DDY CURRE NT

T hic kne ss re a ding s thro ug h c o a ting s a nd insula tio n E le c tro ma g ne tic te c hniq ue fo r me a suring the thic kne ss o f ste e l o b je c ts suc h a s pipe a nd ve sse ls E ddy Curre nt se nso r is pla c e d o n to p o f the the rma l insula tio n Ma g ne tic fie ld g e ne ra te d in the ma te ria l By me a suring the dura tio n fo r e ddy c urre nt to “de c a y” a re fe re nc e to the thic kne ss o f the ma te ria l c a n b e ma de .

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Pr inc iple

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

• Ma g ne tic pulse se nt o ut
• E

ddy Curre nts g e ne ra te d in the (pe rme a b le ) ma te ria l

• E

ddy c urre nts g e ne ra te a ma g ne tic fie ld o f the ir o wn, a ffe c ting the re c e ive r c o il

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT 2 3

PE C signal

1

• While pe ne tra ting the ma te ria l the e ddy c urre nts g e t we a ke r a nd de c a y
• Whe n the E

ddy c urre nts hit the b a c k wa ll a sudde n dro p in E ddy c urre nt stre ng th ta ke s pla c e

• T

he time o f b e twe e n the first pulse a nd whe n this sudde n dro p o ff ta ke s pla c e is a me a sure fo r the thic kne ss o f the ma te ria l

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Applic a tio ns:

• CUI
• I

nsula te d Piping

• I

nsula te d Ve sse ls

• I

nsula te d T a nks

• Hig h te mp a pplic a tio ns
• Surfa c e s c o ve re d b y ma rine g ro wth
• Offsho re rise rs
• Ca isso ns
• Po rt struc ture s, ste e l she e t piling
• Ship hulls
• Co mpo site wra p re pa ire d a re a s
• Be hind c o nc re te fire pro o fing
• Sphe re le g s
• Ve sse l skirts
• Bo ile rs
• Co nc re te c o a te d pipe s
• Po we r pla nt piping (F

lo w Ac c e le ra te d Co rro sio n, F AC)

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Applic a tio n e xa mple : Sphe re le g s

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Applic a tio n e xa mple : CUI

• Piping
• T

a nks

• Ve sse ls

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Applic a tio n e xa mple : Offsho re Rise rs/ Ca isso ns

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Applic a tio n e xa mple : Sub se a a pplic a tio ns

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Ca pa b ilitie s

• Hig h te mpe ra ture no c o nc e rn (-100 to 550 De g re e s C)
• 3-35 mm thic kne ss
• Pipe dia me te r 3” to fla t
• L

ift o ff ra ng e 0-200 mm (up to 200 mm insula tio n

• Ac c ura c y +/ - 10%
• Me a sure thro ug h Aluminum a nd SS she e ting
• Re sults hig hly re pe a ta b le , suita b le fo r c o rro sio n mo nito ring

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Disadvantage s

• Can only be use d on fe r

r

• - magne tic mate r

ials

• Me asur

e s var iations in wall thic kne ss within an obje c t, not absolute thic kne ss

• Can’t me asur

e thr

• ugh galvanize d she e te d insulation
• Small isolate d c or

r

• sion pits c an be misse d.
• Me asur

e s the ave r age wall thic kne ss ove r the footpr int of the pr

• be
• De pe nds on size of pr
• be and amount of lift off

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Re po rting

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PUL SE D E DDY CURRE NT

Re por ting

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