buried piping
TRANSCRIPT
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 1/26
What Lies Beneath
A Comprehensive Look at the
Inspection of Buried Plant Piping
Brant Shields
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 2/26
Technical Manager
Over 20 years in the inspection and NDE field.
Currently hold API 510 Inspection of Pressure essels and API
!5" Inspection of A#ove $round %tora&e 'an(s
$uided )ltrasonics *evel I +advanced, and C%-IP *evel II.
Certified *evel II in )ltrasonics Penetrant testin& /a&netic
Particle testin& and isual inspection.
I also copleted trainin& in Direct Assessent of #uried &as and
liuid pipelines 3 assessent and $- assessent of cased
road crossin&s.
I have ana&ed nuerous pro4ects involvin& ECDAICDA on
natural &as as 6ell as liuid pipelines.
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 3/26
Buried Plant Piping Inspection
Goal
)tili7in& direct assessent
ethodolo&y to inspect
#uried process pipin& to
a8ii7e results and costeffectiveness.
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 4/26
Buried Plant Piping!"#stacles
9 :ound in ost all facilities
9 /ost non; pi&&a#le
9 %hort len&ths
9 Coplicated
confi&urations
9 *iited access
9 In soe cases; liited
(no6led&e
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 5/26
9 Developed fornatural gastransmission
pipelines
9 Used for theinspection of non-piggable pipelines
9 Uses complimentarytechnologies toperform inspections
Direct Assessment- History
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 6/26
Five Steps of Direct
Assessment
9 Pre-Assessment (Gather Information on the
System)
9 Indirect Examination (Gather Data on System)
9 Direct Examination (Excavation of Priority Areas)
9 Remediation (Repair or Replacement)
9 Post-Assessment (Effectiveness of Remediation)
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 7/26
Inspection of Buried Piping
9 'here are any different
considerations to #e &iven 6hen
inspectin& #uried pipin&. %oe
include<
9 1. Pipin& location si7e and
len&th
9 2. Accessi#ility of #uried portion
9 ". Any value of cathodic
protection
9 =. Potential for corrosion
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 8/26
$istorical %ata
9 evie6in& past history canprovide a 6ealth ofinforation. 'his inspectionpractice is already used #ythe a4ority of en&ineer andinspection personnel.
9 >ears of service
9 Past corrosion pro#les
9 %iilar service
9 Chan&es in service
9 Pipin& specifications
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 9/26
Buried Piping! %amage Mechanisms
9 3uried pipin& typically involvesore plannin& and liited accessto perfor siilar a#ove &radeinspections. %everal conditionsarise 6hen perforin& inspectionson #uried pipin&; only the solutions&et ore difficult.
9 %oe daa&e echaniss
9 ErosionCorrosion
9 InternalE8ternal
9 Coatin& dis#ondent
9 Inherent ill defects
9 Insta#ility
9 'hird Party Daa&e
9 %oil to Air Interface
9 Environental crac(in&
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 10/26
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 11/26
&evie' of Techni(ues
9 3y utili7in& soe ethods fro DA in con4unction6ith advanced NDE ethods users can identifyhi&h conseuence areas. /ethods to #e revie6ed<
9CIPS )Close Interval Potential %urvey,
9 %C*G (Direct Current Voltage Gradient)
9 AC*G (Alternating Current Voltage Gradient)
9 GW +$uided -ave )ltrasonics,
9 A+T (Automated Ultrasonics)
9 AC,M (Alternating Field Current Measurement)
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 12/26
9 /ost cases; this is
already perfored if
the pipin& in uestion
has CP9 /easure the pipe to
soil potential
9 Current is interrupted
to provide Btrue
potential
9 Assessent e8tends
for the entire len&th of
the pipin&
Close Interval Potential Surve-
)CIPS.
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 13/26
9 Measres volta!e
!radient on "ried
pipin!
9 Measres the crrent
attenation todetermine coatin!
#ality and inte!rity
9 Difference is spplied
crrent D$%G ses plsed
D$ crrent
A$%G ses isolated
A$ crrent
%irect and Alternating Current *oltage
Gradient
)%C*G / AC*G.
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 14/26
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 15/26
9 &ing of transducers)collar0tool. is placed
on the pipe
9Pressured 'ith air )23
to 43 psi.
9 Instrument and laptop
connected
9 Waves sent do'n the
pipe #i!directionall-
9 &esults are anal-1ed
Guided Waves! General Information
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 16/26
Guided Wave +ltrasonics
9 5uantitative method
9 A#ove0Belo' grade
9 Limited #- somepiping configurations
9 %istance limited #-
soil0coatingconditions
9 Can locate areas ofpro#a#le concern
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 17/26
GW Applications
9 Soil to air interface
9 Buried piping 'ith someaccessi#ilit-
9 %ike0containment penetrations
9 Sleeved road crossings
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 18/26
A+T General Information
9 Technolog- driven to ensure complete
coverage
9 6liminate human error
9 +ses semi or completel- automated raster t-pe
or encoded scanning s-stems
9 Man- s-stems include A!scan7 B!scan and C!
scan displa-s )%!scan also availa#le.
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 19/26
Automated +ltrasonics
9 5ualitative results
9 Scanned image in colormap or gridded format
9 $igh temperatures can #e
inspected
9 Limited configurations
9 Piping has to #e fairl-clean
9 All pipeline coatings haveto #e removed
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 20/26
A+T Applications
9 An- piping 89 and greater )t-picall-.
9 Guided Wave verification points
9 Pipeline surve-s for detailedinspection
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 21/26
AC,M General Information
9 +ses an alternating current field 'hich flo's
on the surface of the pipe #eing inspected
9 %istur#ances in the current field locate cracks
9 +sed as a replacement for conventional Magnetic
Particle and Li(uid Penetrate testing
9 Standard pro#es can operate through non!
conductive coatings up to 3mm thick
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 22/26
Alternating Current ,ield
Measurement
9 Capa#le of detectingand si1ing cracks in
most metals
9 +ses B: and B1components to(uantif- and si1ecracks
9 Can provide accuratedata for engineeringcalculations
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 23/26
AC,M Applications
9 Locating environmental
cracking )SCC.
9 Si1ing cracking defects
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 24/26
The “Miracle Tool
9%iply does not
e8ist.
FFAll ethods and technolo&ies should #e used
to coplient other inspections.
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 25/26
!eys to a Successful
"nspection
9 Ipleentation of the correct inspectiontechniue
9 Pro;active use of ne6 technolo&ies
9 Gno6 the liitations of the techniue
9 In ost cases the euipent is only as &oodas the technician.
8/13/2019 Buried Piping
http://slidepdf.com/reader/full/buried-piping 26/26
Thank ;ou #
9 HuestionsCoents