multidirectional pigging
DESCRIPTION
Multidirectional PiggingTRANSCRIPT
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PPSA
Sem
inar
Aberd
een 2
009
Multi-diameter, bi-directional
Pigging for Pipeline Pre-
commissioning
The Alve Pigging Experience
Aidan O’Donoghue
www.pipeline-research.com
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PPSA
Sem
inar
Aberd
een 2
009 Pig Testing at K-Lab, Kårstø
Dual Diameter Pigging
Dewaxing R&D
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PPSA
Sem
inar
Aberd
een 2
009 Alve Field Overview
•10” x 12” Pipeline – 25% increase in diameter;
•12” 5D bends – no bends in 10”;
•Pigging facilities only topside Norne (No launcher/receiver subsea);
•Vertical launch and receipt;
•RFO Philosophy – two scenarios.
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PPSA
Sem
inar
Aberd
een 2
009 Pig Functional Requirements
• The pigs must be fully bi-directional with high sealing ability in
both directions;
• Low flow rates were expected, in the region of 300-400 l/min
resulting in pig velocity of 0.03 m/s to 0.08 m/s. The pig must be
able to operate at such low velocities;
• Good seal efficiency and pig support/centralisation were required
to ensure safe negotiation with minimum bypass through all
components along the system. The risk of gas bypassing on
return to Norne could result in hydrate formation;
• Ratio between pig flip differential pressure (pressure to flip the
seals forward and cause them to fail) and running differential
pressure to be at least 5:1;
• The drive differential pressure in all pipeline components was
requested to be less than 7 bars;
• Pigs to be fitted with isotope holder for tracking purposes;
• Pig handling to be considered for vertical launch and receipt.
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PPSA
Sem
inar
Aberd
een 2
009 Development Strategy
Study Options
Select Pig Type
/ Concept
Detailed
Design
Test /
Optimise
Base case pig and spares
Supply Four
off Pigs for
Alve Project
Single concept and spares – not
a competition!
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PPSA
Sem
inar
Aberd
een 2
009 Pig Selection for Alve
• “Traditional”, V-slot supports;
• Paddle Pig from Pipeline Engineering;
• Wheel Pig from FTL Seals Technology;
• Other technologies.
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PPSA
Sem
inar
Aberd
een 2
009 Initial Pig Concept
• Single seal for all diameters;
• Wheels in an axi-symmetrical layout.
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PPSA
Sem
inar
Aberd
een 2
009 Piggability – problem at bend
Limited interference between the seals and the inside of the bends.
There is therefore a risk of leakage.
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PPSA
Sem
inar
Aberd
een 2
009 Final Base case pig design
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PPSA
Sem
inar
Aberd
een 2
009 Buckling Modes
• No buckle;
• Buckles when forced, but recovers;
• Buckles only when forced but does not recover;
• Buckles even when not forced to do so.
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PPSA
Sem
inar
Aberd
een 2
009 Non-buckling Seal Design
Select seal size and parameters to avoid buckling in all diameters
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PPSA
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inar
Aberd
een 2
009 Test Facility
Fully Automated with SCADA type system
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PPSA
Sem
inar
Aberd
een 2
009 Open ended testing with water drive
I can’t see a
thing...but it
looks alright!
Allow sealing problems to be
picked up and corrected
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PPSA
Sem
inar
Aberd
een 2
009 Test List
1. Full Facility Test;
2. Reverse Pig in Full Facility;
3. Initial Spool Test, 10”;
4. Observation of rear of pig for buckling – buckle recovery test;
5. Main pipeline test, 12” 320mm ID;
6. Pig into 305mm ID section;
7. Bend test;
8. Flip test at bend;
9. Manifold Tests – Contingency testing;
10. Permanent Set Tests – leave in 10” overnight.
• Test at very low velocity 0.03 to 0.08m/s;
• Measure running DP, DP to reverse pig, flip DP;
• Observe leakage.
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PPSA
Sem
inar
Aberd
een 2
009 Buckle Recovery Test Video
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PPSA
Sem
inar
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een 2
009 Pig Parameters
•Tests performed at low velocity, 0.03 to 0.08 m/s;
• No visible leakage from seals (forward leakage);
• Pig reversible from 305mm straight pipe;
• Flip capacity ratio acceptable;
• No problem with permanent set;
• Non buckling performance of seals acceptable.
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PPSA
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inar
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een 2
009 Problem...Contingency Reversal from Manifold
If leading pig travels as far as the manifold, then can it be reversed?
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PPSA
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inar
Aberd
een 2
009 Requirement for reversal
1. Pig stopped at the ball valve. Bypass ports open to transfer pressure;
2. Start flow. Leaks past rear seal;
3. Increase flow and pressure starts to build;
4. Increase flow further, pressure eventually flips seals and starts to
reverse pig;
5. Finally pig moves but bypass ports need to be big enough to allow all
the flow past or else the seals with flip and the pig will stall again.
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PPSA
Sem
inar
Aberd
een 2
009 Testing at the Manifold
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PPSA
Sem
inar
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een 2
009 Final Position from where reversal was possible
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PPSA
Sem
inar
Aberd
een 2
009 Final Pig Design for Alve Pipeline RFO
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PPSA
Sem
inar
Aberd
een 2
009 Future Developments...
• 12” x 16” Dual Diameter, Bi-directional Pig – 40% Increase in Diameter
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PPSA
Sem
inar
Aberd
een 2
009
Thank You.