Installation of Electrical Heat Trace Flowline by Reel Lay y y 22nd ...
Installation of Electrical Heat Trace Flowline by Reel Lay y y 22nd ...
Installation of Electrical Heat Trace Flowline by Reel Lay y y 22nd ...
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<strong>Installation</strong> <strong>of</strong> <strong>Electrical</strong> <strong>Heat</strong> <strong>Trace</strong> <strong>Flowline</strong><br />
<strong>by</strong> y <strong>Reel</strong> <strong>Lay</strong>y<br />
<strong>22nd</strong> February 2012<br />
Marin Abélanet
Pipe in Pipe Track Record<br />
• 18 Towed Bundle Projects to Date<br />
• Shell Bonga (ITP) & Total CLOV(ITP) (ongoing) - J. <strong>Lay</strong><br />
• Total Tchibelli (ITP), Total Dunbar - S. <strong>Lay</strong><br />
• Including;<br />
– In-place design<br />
1-Mar-12<br />
– Procurement<br />
– Fabrication<br />
– <strong>Installation</strong> & Commissioning<br />
Page 2
Pipe-in-Pipe Pipe in Pipe R&D Program<br />
• Phase 1<br />
– Mechanical Trials<br />
• Phase 2<br />
– Thermal Performance<br />
• Phase 3<br />
– Scalability <strong>of</strong> results from phase 1 & 2<br />
1-Mar-12<br />
Page 3
Technology Development Programme<br />
1-Mar-12<br />
Page 4
Development Programme<br />
1-Mar-12<br />
Page 5<br />
Simulated reeling test rig.<br />
Bend Radius 7.5 mtrs.<br />
Herriot Watt University Scotland.
Enhanced Thermal Performance Pipe-in-pipe Pipe in pipe (PIP)<br />
Cool down Test Results on pre & post<br />
reeled Pipe-in-pipe<br />
1-Mar-12<br />
Page 6<br />
Reduced Pressure<br />
Cooldown 3 times longer for<br />
similar cost in same crosssection
ITP Experience p<br />
1-Mar-12<br />
Page 7
Enhanced Thermal Performance Pipe-in-pipe p pp ( (PIP) )<br />
Non ageing (Silica based - mineral)<br />
Superior thermal performance<br />
Iz<strong>of</strong>lex: U-value = 0,30 W/m 2 .K (on OD)<br />
Aerogels: U-value = 0,74 W/m 2 .K (on OD)<br />
PU Foam: U-value = 1,25 W/m 2 .K (on OD)<br />
Load bearing insulation: No centralizers<br />
Suitable for large range <strong>of</strong> temperature (-196°C + 900°C)<br />
1-Mar-12<br />
Page 8<br />
<strong>Flowline</strong><br />
Sleeve Pipe
The Iz<strong>of</strong>lexTM with reduced pressure advantages<br />
1-Mar-12<br />
Aerogel Iz<strong>of</strong>lex<br />
U = 1,3 W/m2K Cool down to 30 oC = 26 hrs<br />
U = 0.56 W/m 2 K<br />
Cool down to 30 o C = 63 hrs<br />
Enhanced thermal performance for same client provided pipe diameters<br />
Page 9
The Iz<strong>of</strong>lexTM with reduced pressure advantages<br />
Iz<strong>of</strong>lex<br />
OD: 300mm<br />
Aerogels<br />
OD: 340mm<br />
PU Foam<br />
OD: 406mm<br />
Reduced outer pipe diameter for specified thermal performance.<br />
Reduced top tension.<br />
Increased on bottom stability.<br />
L Longer length l th on vessel l reel. l<br />
Pipe-in-pipe benchmark: U = 0.6 W/m 2 2K, Inner Pipe: 236 x 16.3 (Rosa 1500 m WD)<br />
1-Mar-12<br />
Page 10
Drag Test – No centralisers<br />
Assembly <strong>of</strong> 36 mtr. Iz<strong>of</strong>lex test sample Test sample after 5 insertions into<br />
without centralisers 300mtr. outer pipe.(1500mtr. Total)<br />
demonstrating no detrimental impact.<br />
1-Mar-12<br />
Page 11<br />
36 mtr. test sample being positioned<br />
for drag test thru. 300mtr. outer pipe.
EHTF - Full scale tests<br />
Joint Industry Project : 2000/2001<br />
Achievements : Validation <strong>of</strong> the concept (PREVENTION & RESTART<br />
conditions)<br />
U-value = 0,45 W/m 2 K<br />
7 W/m required for temperature maintenance above typical HAT<br />
10 W/m required for restart conditions<br />
1-Mar-12<br />
EHTF fabrication<br />
Page 12<br />
Glycol Jacket at Humble (TX)<br />
Other tests: Rosa pre-feed (2002), pre-feed review <strong>by</strong> JPK (2003), SS7 tests (2006-8)
EHTF System design<br />
Philosophy :<br />
• Optimize p the ppower efficiency y<br />
• High Passive insulation<br />
• Low power indirect heating<br />
Advantages for the Operator<br />
• Reduce power consumption<br />
• Lower CAPEX (no dedicated generator, payload, procurement)<br />
• Lower OPEX<br />
• More flexible in operation p<br />
System limits<br />
1-Mar-12<br />
• 20-50 km/power inlet (total length unlimited)<br />
• 250°C 250 C<br />
Page 13
EHTF design<br />
1-Mar-12<br />
Power<br />
supply<br />
φ1 φ2 φ3 Iz<strong>of</strong>lex<br />
Page 14<br />
Outer pipe<br />
STAR CONNECTION<br />
Neutral point<br />
Potential = 0V
Operational use <strong>of</strong> active flowlines: flowlines<br />
Preventative action during operation<br />
Low flow rate<br />
Varied effluent composition<br />
Longer shutdowns<br />
Restart capacity<br />
After long shutdown and wax formation Time<br />
Reduce chemical consumption<br />
1-Mar-12<br />
Page 15<br />
WAT<br />
HAT<br />
T°C<br />
Shutdown
System design process<br />
1-Mar-12<br />
Input parameters<br />
Output<br />
Notes<br />
• Critical temperatures p ( (HAT, , WAT) )<br />
• <strong>Heat</strong>-up requirements<br />
• Redundancy<br />
• Pipe OD, OD WT, WT Length<br />
• U-value<br />
• Voltage<br />
• Total copper cross section<br />
• Number <strong>of</strong> wires for redundancy<br />
• No interaction with cathodic protection<br />
• No interaction with pipe electrical or magnetic properties<br />
• Applicable up to to 250°C<br />
Page 16
EHT OPERATIONS & THERMAL MODELLING<br />
Hydrate dissociation<br />
<strong>Heat</strong>-up as a function <strong>of</strong> pipeline contents and power.<br />
With resistive heating, power supply is uniform along pipe<br />
no risk <strong>of</strong> local overheating<br />
1-Mar-12<br />
Page 17<br />
Same asymptote
EHTF DESIGN: main elements<br />
1-Mar-12<br />
Wires<br />
Page 18<br />
<strong>Electrical</strong> connectors<br />
Insulation<br />
Production Pipe<br />
Girth Weld<br />
<strong>Electrical</strong> Penetrators <strong>Electrical</strong> Cables<br />
Bulkhead (end-pieces)<br />
<strong>Electrical</strong> <strong>Heat</strong>ing Wires
FEA Results<br />
1-Mar-12<br />
Page 19<br />
<strong>Reel</strong>ing impact ca. 10%
BULKHEAD AND END PIECES<br />
Standard Subsea 1 kV connector: 1700 installed on Pazflor, 30,000+ worldwide<br />
1-Mar-12<br />
Page 20
FULL SCALE TESTS<br />
1-Mar-12<br />
Page 21
Conclusions<br />
• System defined<br />
• U value <strong>of</strong> 0.5 W/(m².K) after reeling is validated<br />
• Wire integrity after reeling and 25 years at 100°C verified and validated<br />
• Double barrier power feedthrough system available<br />
• Low voltage operation<br />
• High redundancy<br />
• EHTF in-situ in situ tests do not impact production<br />
• System can be completely tested onshore before installation<br />
1-Mar-12<br />
Page 22
<strong>Electrical</strong>ly y <strong>Trace</strong> <strong>Heat</strong>ed Pipe p in Pipe p<br />
• EHTF is an effective alternative to DEH.<br />
• Low Power requirement<br />
• Long distance applications<br />
• Technically Qualified <strong>by</strong> Total for Islay<br />
• DNV Qualified Q<br />
1-Mar-12<br />
Page 23
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