T UBE ADVANCE INSPE CT ION UL T RASONIC IO N SERVIC ES DAC O - - PowerPoint PPT Presentation

ADVANCE UL T RASONIC INSPE CT ION

DAC O N INSPEC T IO N SERVIC ES

T UBE INSPE CT ION

PSE C vs. MF L & NF T

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

PSE C vs. MF L and NF T

F

• c us dur

ing this wor k shop will be on PSE C and how it c ompar e s to the othe r available te c hnique s.

• Pa rtia l Sa tura tio n E

d d y Curre nt

• Da c o n’ s pre fe rre d te c hniq ue fo r fin/ fa n tub e s a nd in so me c a se s no rma l CS tub e s
• Ma g ne tic F

lux L e a ka g e

• His
• Ne a r F

ie ld T e sting

• Only b e e n o n the ma rke t in re c e nt ye a rs.

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Par tial Satur ation E ddy Cur r e nt

T he or y

• Pro b e c o nta ins no rma l e d d y c urre nt c o ils
• In a d d itio n the pro b e c o nta ins 2 c o ils tha t a re use d a s e le c tro ma g ne t
• T

he e le c tro ma g ne t in the PSE C pro b e is use d to pa rtly c a nc e l o ut the ma g ne tic pro pe rtie s

• f the ma te ria l
• T

he e le c tro ma g ne ts fie ld is ma inly a c tive a t the inne r surfa c e o f the tub e ma te ria l

• Co mpe nsa te s the skin e ffe c t
• So me e d d y c urre nts c a n pe ne tra te

the ma te ria l

• De fe c ts will c a use a c ha ng e in pe rme a b ility

a nd in a mo unt o f e d d y c urre nts in tha t lo c a tio n

• T

he impe d a nc e o f the te st c o il will b e a ffe c te d b y a c o mb ina tio n o f c ha ng e s in pe rme a b ility a nd e d d y c urre nt stre ng th

• Sig na ls tha t re pre se nt the impe d a nc e o f the te st c o il a nd thus

the c o nd itio n o f the tub e a re pre se nte d o n a c o mpute r sc re e n

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advantage s

• Po ssib le to e xa mine c a rb o n ste e l

(finne d ) tub e s

• Bo th pits a nd o ve ra ll wa ll-lo ss c a n b e

d e te c te d (d ia m. pits > 2 mm)

• Sizing o f inte rna l d e fe c ts po ssib le

(pha se info rma tio n)

• Po ssib le to d isting uish b e twe e n

inte rna l a nd e xte rna l d e fe c ts

• No n vo lume tric d e fe c ts like c ra c ks

c a n b e d e te c te d d e pe nd ing o n size , sha pe a nd o rie nta tio n

• De fe c ts und e r suppo rt pla te s c a n b e

d e te c te d a nd to so me e xte nt q ua ntifie d

Disadvantage s

• Sizing o f e xte rna l d e fe c ts limite d

(b a se d o n sig na l vo lume )

• Cle a ning o f tub e s ve ry c ritic a l b e c a use

use o f b ig fill fa c to r pro b e re q uire d

Par tial Satur ation E ddy Cur r e nt

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

Magne tic F lux L e akage (MF L )

T he or y

• Pro b e c o nta ins pe rma ne nt ma g ne ts whic h a re use d to fo rm a ma g ne tic fie ld in the

tub e wa ll

• De fe c ts will influe nc e the pa th o f the ma g ne tic fie ld a nd will c a use so me o f flux to le ak
• ut o f tub e whic h will b e pic ke d up b y the c o ils in the pro b e
• Wa ll thinning will inc re a se the d e nsity o f the ma g ne tic flux line s in the re ma ining tub e

wa ll whic h is pic ke d up b y the ha ll se nso r

• Size o f le a ka g e fie ld s d e pe nd s o n pull spe e d a nd size , sha pe , o rie nta tio n o f the d e fe c t
• Sig na ls tha t re pre se nt the size o f the le a ka g e fie ld a nd thus the c o nd itio n o f the tub e

a re pre se nte d o n a c o mpute r sc re e n

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advantage s

• F

a st whe n use d a s sc re e ning te c hniq ue

• Po ssib le to e xa mine c a rb o n ste e l (finne d )

tub e s

• Bo th pits a nd o ve ra ll wa ll-lo ss c a n b e

d e te c te d (d ia m. Pits > 2 mm)

• Po ssib le to d isting uish b e twe e n

in-a nd e xte rna l d e fe c ts

• No n vo lume tric d e fe c ts like c ra c ks c a n b e

d e te c te d d e pe nd ing o n size , sha pe a nd

• rie nta tio n
• De fe c ts und e r suppo rts c a n b e d e te c te d

a nd to so me e xte nd q ua ntifie d

Disadvantage s

• L

e ss suita b le a s sta nd a lo ne te c hniq ue

• Sizing o f in- a nd e xte rna l d e fe c ts limite d

(b a se d o n sig na l vo lume )

• Pro b e spe e d d e pe nd e nt
• Cle a ning o f tub e s ve ry c ritic a l b e c a use
• f hig h fill fa c to r pro b e re q uire me nt

Magne tic F lux L e akage (MF L )

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

Ne ar F ie ld T e sting (NF T )

T he or y

In Ne a r F ie ld T e sting the pic kup c o ils a re lo c a te d within 0-1.5 tub e d ia me te rs a wa y fro m the e xc ite r c o ils. Within the ne a r fie ld zo ne the e d d y c urre nts g e ne ra te d in the tub e wa ll b y the a lte rna ting c urre nt d rive n e xc ite r c o il c re a te a shie ld ing e ffe c t o f the e xc ite rs flux. As e d d y c urre nts pro pa g a te thro ug h the ma te ria l’ s inne r wa ll, a n o ppo sing se c o nd a ry ma g ne tic flux is d e ve lo pe d in the ma te ria l tha t a tte nua te s the prima ry fie ld stre ng th a nd limits its e xte nsio n. L

• g ic a lly, the ne a r zo ne wo uld b e the a re a whe re the re is g re a te st se nsitivity to

d isc o ntinuitie s b e c a use o f the hig h c o nc e ntra tio n o f ma g ne tic flux.

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Advantage s

• F

a st whe n use d a s sc re e ning te c hniq ue

• Po ssib le to e xa mine c a rb o n ste e l (finne d )

tub e s

• Bo th pits a nd o ve ra ll wa ll-lo ss c a n b e

d e te c te d (d ia m. Pits > 3 mm)

• De te c tio n o f inte rna l thinning a nd pitting

b a se d o n se nsitivity o f e d d y c urre nt lift o ff

• Cle a ning o f tub e s le ss c ritic a l

Ne ar F ie ld T e sting (NF T )

Adva nta g e s & Disa dva nta g e s

Disadvantage s

• Ca nno t d e te c t e xte rna l d e fe c ts
• Sizing d e fe c ts limite d

(b a se d o n sig na l vo lume )

• L

e ss suita b le a s sta nd a lo ne te c hniq ue

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Signals e xplaine d

Conve ntiona l E T sig na l Ca libra tion tube 20,40,60,80 % E xt 10 % ID g roove

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

MF L signal c alibr ation tube

Ca libra tion tube 5 mm dia m. de fe c ts

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PSE C signal c alibr ation tube

Ca libra tion tube 5 mm dia m. de fe c ts

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PSE C signal c alibr ation tube , phase spr e ad

Ca libra tion tube 5 mm dia m. de fe c ts

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PSE C signal c alibr ation tube , absolute c hanne l

Ca libra tion tube Absolute e xte rna l 25% 50E (inc luding some e xte rna l da ma g e ) hole 5 mm

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

PSE C signal finne d tube

F inne d tube Drille d hole s 1.5 mm 2.0 mm 3.0 mm

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

NF T signal c alibr ation tube

Ca libra tion tube 6.35 mm Dia m. De fe c ts

DACON INSPE CT ION SE RVICE S

FO R A LL YO UR INSPEC TIO N NEED S

Signal c ompar ison PSE C, MF L , NF T

PSE C

5 mm ho le

MF L

5 mm ho le

NF T

6.35 mm ho le

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