Inspectability of Piping at the Valdez Marine Terminal By Tom - - PowerPoint PPT Presentation

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Inspectability of Piping at the Valdez Marine Terminal By Tom - - PowerPoint PPT Presentation

Jun 28, 2023 377 likes •644 views

Inspectability of Piping at the Valdez Marine Terminal By Tom Kuckertz & Anna Carey TOEM Commi8ee DifficulttoInspect Pipes at VMT Corrosion on uninspectable pipes Regulatory requirements for InspecDon Alyeskas

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SLIDE 1

Inspectability of Piping at the Valdez Marine Terminal

By Tom Kuckertz & Anna Carey TOEM Commi8ee

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SLIDE 2

Difficult‐to‐Inspect Pipes at VMT

  • Corrosion on “uninspectable” pipes
  • Regulatory requirements for InspecDon
  • Alyeska’s “smart” pigging acDviDes
  • Survey of state‐of‐the‐art pigging technologies
  • PWSRCAC’s inspectability of the VMT project
  • Alyeska’s in‐line‐inspecDon (ILI) project
  • Concluding remarks
  • QuesDons and answers

PWSRCAC September 2013 Board MeeDng

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SLIDE 3

Efforts to Address Corrosion on “Uninspectable” Pipes

  • “Uninspectable” aka “difficult‐to inspect”

– buried or insulated

  • Dr. Rust (2012)
  • Alyeska

– Berth 4 (2012 and extensive in 2013)

PWSRCAC September 2013 Board MeeDng

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SLIDE 4

An example of corrosion at a girth weld

  • n the riser pipes at Berth 4 (2012)

PWSRCAC September 2013 Board MeeDng

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SLIDE 5

Repairs using welded sleeves are

  • ccasionally necessary (2012)

PWSRCAC September 2013 Board MeeDng

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SLIDE 6

In 2012 Alyeska embarked on a program to inspect over‐ water girth welds for Berths 4 and 5 (inspecIon in progress: August 2013)

PWSRCAC September 2013 Board MeeDng

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SLIDE 7

Typical state of a girth weld as insulaDon was removed

PWSRCAC September 2013 Board MeeDng

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SLIDE 8

Typical repair, cleaning, & recoaIng of girth weld

PWSRCAC September 2013 Board MeeDng

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SLIDE 9

PWSRCAC became aware of differing requirements for inspecIon based upon regulatory cognizance

  • DOT –PHMSA – Pipeline up to Tanks 1 and 3

– 1 year over water, 3 years over land or buried

  • BLM & ADEC – Pipeline and VMT shared

– In accordance with Grant and Lease and Alaska AACs

  • Other Regulators (State and Federal)

PWSRCAC September 2013 Board MeeDng

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SLIDE 10

Ordinary instrumented “Smart” pigs are used for pipe inspecIon

  • MagneDc flux used to measure wall thickness

– ResoluDon about 1 in2

  • Propelled by fluid being transported
  • Limited to use in straight, constant‐diameter

secDons of pipe or secDons with only large radii bends

  • Typically not usable in buried and insulated

piping at the VMT

PWSRCAC September 2013 Board MeeDng

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SLIDE 11

Every three years Alyeska runs a “smart” (instrumented) pig through the Pipeline

PWSRCAC September 2013 Board MeeDng

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SLIDE 12

The end of the line for the “smart” pig is at the pig trap in Alyeska’s East Metering Facility

PWSRCAC September 2013 Board MeeDng

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SLIDE 13

Scraper (“dumb”) pigs are run through the Pipeline every 10 days

PWSRCAC September 2013 Board MeeDng

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SLIDE 14

Neither “smart” nor “dumb” pigs are run at the VMT beyond the East Metering pig trap

PWSRCAC September 2013 Board MeeDng

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SLIDE 15

Development of Improved InspecDon Technologies

  • MagneDc flux and/or ultrasound for wall

thickness measurements

– Precision less than 1 in2

  • Agile –

– small radii bends OK – VariaDon in diameter OK (pass through smaller valves)

  • Can propel itself with power umbilical
  • Can exit at entry locaDon
  • Applicable to VMT?

PWSRCAC September 2013 Board MeeDng

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SLIDE 16

Many vendors claim the capability to inspect heretofore uninspectable pipes.

PWSRCAC September 2013 Board MeeDng

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SLIDE 17

Newer pigs can inspect smaller diameter pipes

PWSRCAC September 2013 Board MeeDng

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SLIDE 18

Pipes with a diameter of 1 foot or less can be inspected using some

  • f the newer

pigs

PWSRCAC September 2013 Board MeeDng

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SLIDE 19

The newer pigs are very

  • agile. This pig

can navigate back to back small radii bends

PWSRCAC September 2013 Board MeeDng

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SLIDE 20

Some inspecDon technologies are roboDc and work from the outside of the pipe

PWSRCAC September 2013 Board MeeDng

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SLIDE 21

Some internal inspecDon technologies are roboDc and can propel themselves both forward and backwards

PWSRCAC September 2013 Board MeeDng

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SLIDE 22

PWSRCAC’s Inspectability

  • f Piping at the VMT Project
  • Survey of newer inspecDon technologies with respect

to supporDng inspecDon needs of VMT

  • Expert to compare new technologies with needs of

VMT

– RFP developed and ready for issuance – PotenDal vendors idenDfied

  • Assess extent of Alyeska’s exploraDon of in‐line‐

inspecDon technologies

  • Staff trained on modern pigging technologies
  • Pending confirmaDon of Alyeska support
  • Pending decision on expert vs. observaDon of Alyeska

in‐line‐inspecDon project

PWSRCAC September 2013 Board MeeDng

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SLIDE 23

Alyeska’s In‐Line‐InspecDon (ILI) Project

  • Early in development of concept
  • TesDng of concept

– B‐Header at Ballast Water Treatment Facility

  • Empty pipe – no fluid
  • Tethered pig

– Powered by umbilical – Can exit at entrance locaDon (back‐out)

– Specifics unknown

  • Can stakeholders observe?

PWSRCAC September 2013 Board MeeDng

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SLIDE 24

The are some limitaDons on what pigs can do

PWSRCAC September 2013 Board MeeDng

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SLIDE 25

QuesDons & Answers

PWSRCAC September 2013 Board MeeDng

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SLIDE 26

End

PWSRCAC September 2013 Board MeeDng