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KonstruksjonsdagenUnderstell og overbyggUtfordringer og erfaringerVidar-André Gjerstad – 30. August 2017
August 22, 20171
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Cautionary Statement
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Drift av understell og overbygg – utfordringer og erfaringer
Agenda:
Introduksjon – Ekofiskfeltet – driftsutfordringer.
Bølge-i-dekk – typiske avbøtende tiltak.
Eksempel på sprekkfunn i understell (Jackets).
Lederør (Caisson).
Eksempler på utfordringer med overbygg.
Strukturintegritet - utfordringer
SWL
Subsidence
Increased MetOcean criteria
Design Airgap criteria:
API 1.5m + margin: Global Waves Local Waves
Wave-in-deck
(global & local)
Topside weight and
configuration changes,
corrosion
Degradation
1972 today
Bølge-i-dekk - typiske avbøtende tiltak
Raise bridge
Reinforce cantilever area(or replace plate with grating)
Local Wave
Protection
Grout strengthening
of jacket braces
Remove redundant
underdeck walkways,
equipment, pipes, risers,
conductors, etc.
Install sway bracesReinforce cellar deck
Install wave protection wall
(or open deck to let water flow though)
Remove
marine growth
Inspeksjon av understell - et eksempel
2 vannfylte stag fra 8-årlig rutineinspeksjon (FMD)
NDT (ACFM) med dykker –> ingen sprekk funnet
Alle rundsveiser og langsgående sveiser rengjort og inspisert med ROV.
Overflaten av begge stag sandblåst 100% -> årsak endelig funnet.
2 flooded members
Through thickness crack
in center line of weld
Longitudinal and
circumferential shop welds
Leg
Leg Double sided
stub to leg weld
Single sided stub to
brace closure weld
Anode attachment weldsDrilled hole
Stopphuller
20mm50mm
Wel
d
HA
Z/ed
ge o
f gr
ind
ing
~20
mm
~40
mm
100mm
#1
#3
75mm
crack
15mm
#2 #1
Sprekker i understell - lærepunkter
Utfordrende/vanskelig å finne sprekker med CVI (lys/sikt/bevegelser).
Sprekker oppstår ikke nødvendigvis der utmattingsanalyser indikerer. Inspeksjonsplan må ta hensyn til dette.
Viktig med god fabrikasjonsutførelse og oppfølging.
Viktig med god kommunikasjon, riktig rapportering og systemer for lagring av data (SIMS).
FMD er veldig effektivt/rimelig og pålitelig -> jacket strukturer bør designes med tørre stag.
Korrosjonshull i lederør for sjøvannspumper
-30m
-20m
-10m
0m
12 6
3
9
1/Ø1002/150x1003/100x75
4/100x75
5/Ø100
6/Ø1007/Ø40
-25m
-15m
-5m
+5m
guides
guides
3/Ø2004/Ø150
2/Ø75
1/Ø70
1/Ø80
1/200x150
1/80x100
1/80x450
1/Ø80
3a/80x3003b/90x1503c/80x1503d/100x2003e/100x2503f/Ø803g/Ø903h/Ø1103i/100x1503j/100x1503k/100x503l/100x1503m/100x150
1/Ø90
7/Ø50 3/Ø150
2/200x100
4/Ø200
5/Ø90
&/Ø90
Ø1140x20 Ø1140x20 Ø1140x20 Ø1140x20Ø700x25
approx. MSL
Korrosjonshull i lederør for sjøvannspumper
Lederør for sjøvannspumper i karbonstål malt både utvendig og innvendig.
Pumper i super-duplex - mangler anoder.
Lederører virker som anode - små skader i malingsbelegg fører til hurtig korrosjon.
Analyser basert på detaljert kartlegging av skader => integritet ok.
Lederør (caissons) - lærepunkter
Sekundær funksjon –> får begrenset oppmerksomhet.
Lederør i karbonstål med pumper i super duplex -> galvanisk korrosjon.
Avløpsrør med varmt vann kan være ekstra utsatt for korrosjon.
Lederør representerer en risiko som fallende last.
Rekkverk
Sokler til rekkverk utsatt for korrosjon.
Kostbart å inspisere/vedlikeholde sidemonterte sokler (krever stilas).-> sokler bør være toppmontert.
Material bør hvis mulig være aluminium (stål/brannbestandig i klassifisert område, ref. NORSOK S-002).
Regelverkskrav til rekkverk på lasteområdet er uoversiktlig/uklare (NORSOK C-002, N-003, R-002).
Varmepåkjent struktur – ‘waste heat recovery unit’
Høy korrosjonshastighet grunnet vekslende varmepåvirkning.
Utfordrende og kostbart å reparere.
Konstruksjoner i områder med vekslende varmepåkjenning må har korrosjonstillegg og overflate som tåler omgivende temperatur.
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