A long range ultrasonic technique for survey of pipework ...farajoosh-co.com/files/tests/Teletest...
Transcript of A long range ultrasonic technique for survey of pipework ...farajoosh-co.com/files/tests/Teletest...
Plant Integrity Limited
Teletest ®
A long range ultrasonic technique for survey of pipework and pipelines
Plant Integrity Limited
Teletest ®
Reduction in the access costs
No removal of insulation
Inspect inaccessible areas (clamps)
Inspect buried pipes
The whole pipe wall is tested
Guided waves offer the following:
Plant Integrity Limited
Teletest ®
Internal Corrosion/Erosion
External Corrosion
Teletest® is sensitive to
loss of pipe wall cross-section
Plant Integrity Limited
Teletest ®
Weld
Minor Feature
Moderate
Feature
UK Chemical Plant
8" Monomer Line
Plant Integrity Limited
Teletest ®
• Diameters
–2" to 48"
• Coverage
– 100%
• Test Range
–Typical ±30m
–Under ideal conditions ±180m
• Productivity
–Typical 300m per day
• Temperature
–Can be used on pipes in service up to +125°C
Features
Plant Integrity Limited
Teletest ®
Validation of a 3.5km Heavy Fuel Oil Line
• Problem areas highlighted for inspection
- Road Crossings - Damaged insulation
- Corroded Casing - Evidence of Flooding
- Damaged Steam Tracing
• Solution
- 30 locations identified for Teletest® survey
- 800m of line tested in 4 days
- Metal loss features found at 12 positions - confirmed
- Teletest® adopted by Refinery’s NDT Service Provider
Case History
UK Refinery
Plant Integrity Limited
Teletest ®
• Riser Inspection • End customer PDVSA
• Main contractor TechCorr
• Teletest could inspect splash zone
• ‘Splashtron’ coating posed no problem
Case History
Lake Maracaibo
Plant Integrity Limited
Teletest ®
Annual road crossing inspections - 1999 to 2004
• Problem
- Road and Caribou Crossings up to 45m wide
- Pipe diameters from 6" to 42"
- Pipes contain oil, gas, water or a combination
- Pipes insulated with polyurethane foam
- Corrosion at field applied weld packs
• Solution
- Up to 175 crossings tested per annum at three production fields
- Teletest has identified corrosion at road crossings
- Confirmed by follow-up inspection
Case History
Alaska USA
Plant Integrity Limited
Teletest ®
• Water injection lines in oil processing facility
• Plastic coated lines 27 years old
• Some leaks have occurred
• Lines pass beneath process plant and control
room
Case History
10" buried lines
Plant Integrity Limited
Teletest ®
• APT (UK)
• ARCO (Alaska)
• BNFL (UK)
• BP (UK, USA)
• Caltex (Indonesia)
• Chevron (Venezuela)
• Conoco (UK)
• Dow Chem (Germany)
• Exxon (UK, USA)
• Hindustan Petroleum (India)
• Huntsman Chem. (USA)
• Loop LLC (USA)
• Maersk Oil (Denmark)
• Norsk Hydro (France)
• ONGC (India)
• PDVSA (Venezuela)
• Petrobras (Brazil)
• Phillips (USA)
• Shell (UK, SE Asia, USA)
• ST Services (UK)
• Suncor (Canada)
• TotalFinaElf (UK)
• Ultramar (Canada)
• Vopak (NL)
Clients
Plant Integrity Limited
Teletest ®
Method Elevated Insulated Buried
Visual 2.0 5.0 10.0
Manual UT 2.5 5.0 10.5
Mechanised UT 9.0 11.5 17.0
Prof ile RT 6.0 5.5 14.5
Pulsed EC 7.0 5.5 15.0
MFL 11.0 10.0 16.0
Teletest® 1.1 1.0 1.3
Comparative costs to inspect 100m of 12-inch pipe
Comparison of
Inspection Costs
Plant Integrity Limited
Teletest ® Unfocused result
Unfocused result
0
50
100
150
200
250
0.0
1
0.2
2
0.4
4
0.6
6
0.8
7
1.0
9
1.3
1
1.5
2
1.7
4
1.9
6
2.1
7
2.3
9
2.6
1
2.8
2
3.0
4
3.2
6
3.4
8
3.6
9
3.9
1
4.1
3
4.3
4
4.5
6
4.7
8
4.9
9
5.2
1
5.4
3
5.6
4
5.8
6
6.0
8
6.2
9
6.5
1
6.7
3
6.9
4
7.1
6
7.3
8
7.5
9
7.8
1
8.0
3
8.2
4
8.4
6
m
sig
na
l a
mp
litu
de
Notch position
Pipe endInitial pulse
Plant Integrity Limited
Teletest ® Focused result
Focused result
0
50
100
150
200
250
0.0
1
0.2
2
0.4
4
0.6
6
0.8
7
1.0
9
1.3
1
1.5
2
1.7
4
1.9
6
2.1
7
2.3
9
2.6
1
2.8
2
3.0
4
3.2
6
3.4
8
3.6
9
3.9
1
4.1
3
4.3
4
4.5
6
4.7
8
4.9
9
5.2
1
5.4
3
5.6
4
5.8
6
6.0
8
6.2
9
6.5
1
6.7
3
6.9
4
7.1
6
7.3
8
7.5
9
7.8
1
8.0
3
8.2
4
8.4
6
m
sig
na
l a
mp
litu
de
Initial pulse
Notch signal
Pipe end