Read about JF NDT`s corrosion mapping and

James Fisher \ NDT
Contact us
James Fisher
NDT
T: +44 (0) 1244 520058
F: +44 (0) 1244 535440
E: contact@jfndt.com
W: www.jfndt.com
James Fisher NDT
Unit 44, First Avenue, Deeside Industrial Park, CH5 2NU
James Fisher NDT is part of James Fisher Nuclear Limited. James Fisher Nuclear Limited is registered in Scotland:SC204768 North Meadows,
Oldmeldrum, Inverurie, Aberdeenshire, AB51 0GQ. James Fisher Nuclear Limited is a subsidiary of James Fisher and Sons plc.
1284
James Fisher
NDT
Corrosion Mapping
and Monitoring
James Fisher \ NDT
What we do
Pipework or tank failures due to corrosion
can halt production and if valuable product
escapes into the environment can cost a
business a lot more.
James Fisher NDT (JF NDT) offers a comprehensive range of
non-invasive corrosion mapping and monitoring services,
delivered by experienced engineering consultants and industry
qualified NDT technicians that can cover all installations from a
single pipe or tank to complex and wide-spread installations.
It enables companies to meet their regulatory and statutory
obligations (including EEMUA 159) and equips them to
undertake intelligent predictive maintenance and asset
management to reduce costs and protect production.
James Fisher \ NDT
Pipeline Corrosion
Mapping - SLOFEC
Service
SLOFEC (Saturated Low Frequency Eddy Current)
is the world’s leading technology to fast scan for
corrosion and check the general condition of
pipelines, with an exceptional capability to deliver
defect reports.
The SLOFEC Pipe Scanner can carry out external
scans on pipelines with a wall thickness up to 25mm
and surface coatings or wrapping up to 7mm, and
allows high speed inspection on pipes with surface
temperatures up to 120 degrees C and a curvature of
1” diameter upwards.
SLOFEC Pipe Scanners are able to fulfil all defect
marking and documentation requirements. Signal
data can be stored on the computer hard disk and
retrieved whenever necessary, and every scanned
track can be processed and combined to a colour
scan of the inspected pipe, using original
SLOFEC software.
Advantages
n Fast screening method for local metal loss
n Inspection of thick wall components and through
thick coating
n Higher defect detection sensitivity than magnetic
flux leakage
n Distinction between topside and bottom defects
n Colour condition mapping
n Minimum subject preparation and inspection costs
n Inspection at high temperatures
n Inspection of galvanised or aluminium
protected piping
James Fisher \ NDT
James Fisher \ NDT
Guided Wave
System Pipeline
Corrosion
Monitoring
Where regular inspection is needed substantial cost
savings can be made by leaving a gPIMS® transducer
ring permanently bonded to the pipe with a cable link
to a connection box in an easy-to-access point.
On buried pipe and on elevated sections a cable
connection is brought to ground level, while on risers
the connection can be made on the platform.
The polyurethane moulding on the transducer ring
normally limits gPIMS® to a maximum operating
temperature of 95°C, although gPIMS® will survive
excursions to around 120°C. A higher temperature
variant is being developed using a silicone moulding.
Advantages
Service
Long range ultrasonic guided wave screening gives
the ability to check for areas of corrosion or erosion on
large lengths of pipeline from a single access point or
through continuous monitoring from a permanent
installation, and is particularly suitable for buried pipes,
offshore and other locations where moisture resistance
is particularly important.
The inspection can be performed while the pipe is still
in service, even if it is filled with fluid or is operating at
an elevated temperature. With the guided wave
method, hundreds of metres of pipe can be screened
in one day, making it hugely efficient.
Gaining access to pipelines accounts for a large
proportion of inspection costs and is a particular issue
offshore, on buried pipes and at any location where
scaffolding is required. Guided Wave screening offers
substantial savings because it requires only a single
access point for a pipe length of up to 100 metres. It is
particularly useful for screening sleeved road crossings
and road jump overs, corrosion under insulation, wall
penetrations, pipe racks and pipe support corrosion.
JF NDT employs the Wavemaker guided wave system,
which can be used as part of the initial inspection of
pipelines or as a permanent monitoring device
delivering a stream of data to a remote collection point.
Trend analysis can be formulated to manage and
understand potential corrosion rates as part of an
on-going integrity management project.
The system uses a transducer ring to generate guided
waves sent out in each direction. The Wavemaker
instrument linked to a laptop computer generates the
signal and detects the corrosion, using Wavepro
software to analyse the reflections.
n Rapid screening of long pipe lengths to detect
external or internal corrosion.
n A range of more than 100m can be screened and
sensitivity to changes of less than 1% in crosssectional area can be achieved.
n Available in the full range of sizes from 2-60 inch;
the pre-moulded gPIMS® is initially available in the
range from 6-24 inch.
The result below shows a typical Guided Wave result
from a permanent installation on a section of straight
above ground pipe. Three data sets are shown over
the course of a year.
James Fisher \ NDT
James Fisher \ NDT
Pipeline Corrosion
Monitoring with
RIGHTTRAX
Advantages
Service
n Meets regulatory requirements for monitoring
pipeline assets
The RIGHTRAX system uses ultrasonic sensors
permanently installed at strategic locations to
continuously monitor the thickness of buried pipeline
along its full length using standard ultrasonic pulse
echo techniques
RIGHTRAX uses fourteen discrete embedded sensors
located uniformly along the flexible strip 240 mm x
60 mm. Once fitted the excavation is filled in and
readings are taken from above ground positions via a
single high temperature coaxial cable up to 70m long.
The system was originally designed for non-intrusive
monitoring of pipelines in the Oil and Gas sector.
It can be used as part of an integrated system or
stand alone for monitoring isolated areas of concern,
and can be monitored as a remote system many
miles from site.
RIGHTRAX is suitable for a pipe wall thickness range
up to 100 mm and identifies wall thickness resolution
to 0.2 mm with an accuracy up to +/- 0,0025mm
n Cost effective system for continuous non-intrusive
monitoring of asset condition.
n Built in temperature sensor, user memory area and
an internal calibration reference.
n Self-adhesive for simple installation providing high
temperature permanent ultrasonic coupling
operating at -25˚C to 125˚C.
n Fully automated and self-calibrating system (no
intervention required)
n Monitoring of corrosion rates makes remaining life
calculations very accurate.
n In built alarm systems for highlighting areas of
concern (pre-set at installation stage to client
requirements)
n System collects the data automatically so the
quality of the data is preserved.
n Measurement data can be stored on a software
database.
n The system manager can evaluate corrosion trend
of very specific measurement points.
James Fisher \ NDT
James Fisher \ NDT
Remote Access
Corrosion Mapping
& Thickness
Measurement
Advantages
Service
Thickness measurements of storage tanks, pressure
and containment vessels, pipe work and other steel
structures are an important part of periodic
inspections and in some cases may be a statutory
requirement. Thickness measurements can be used to
monitor corrosion, erosion and defects including
hydrogen blistering.
JF NDT can deliver cost effective corrosion mapping
& thickness measurement services by employing a
range of remote access crawlers fitted with ultra
sound thickness measurement probes, able to climb
ferro-magnetic structures for repeatable and reliable
inspections.
For corrosion mapping, JF NDT use the RMS
corrosion mapping systems. The RMS is a C-Scan
imaging system mounted on a magnetic crawler to
enable reliable and safe remote access to ferromagnetic structures.
The RMS crawler has a scan width of 600mm for large
areas and 300mm for more constricted surfaces and
pipework. With a scan speed of up to 730mm/second,
the RMS can rapidly map the thickness of a steel
structure and automatically record the A-Scan image,
the C scan image and the thickness measurement for
analysis and reporting. With the 600mm scan width,
12m can be scanned in an hour.
For thickness measurements, JF NDT employs
Silverwing Scorpion lightweight magnetic crawlers.
The Scorpion is a magnetic crawler with a 5MHz twin
crystal transducer which records spot thickness
measurements. The Scorpion crawler is capable of
climbing any ferro-magnetic surface and is
particularly manoeuvrable and suitable for recording
thicknesses around pipe junctions and nozzles.
n Crawlers can be rapidly mobilised for inspections
minimising on site disruption of operations.
n There is no requirement to use scaffolding to
access the vessel surface
n Crawlers are reliable and can travel and operate
vertically, horizontally and even upside down.
n With umbilical lengths of 30m, the crawlers can
access the majority of structures.
James Fisher \ NDT
James Fisher \ NDT
Ultrasonic
Corrosion Mapping
with Video Tracking
Advantages
n Effective scanning of difficult areas
n High quality colour images precisely map the
topography of the area scanned
n Scans build up into composite picture of
larger areas
n Capability to inspect plant on-line in temperatures
of up to 350 degrees C.
Service
Areas of tanks or pipework that are difficult to access,
or component parts with awkward geometry such as
elbows, tees, dished ends, manifolds and nozzles can
be inspected using pulse-echo ultrasonic C-scan
technology offered by JF NDT.
The non-intrusive technique is not suitable for large
areas because it is comparatively slow but it delivers
outstanding colour graphic imaging of the area scanned.
The video-tracking technology is employed using free
hand scanners, and each scan typically covers
0.25sq metre.
The technique involves scanning one or more straight
beam probes over a prescribed, dual axis scan pattern
over a pipe or pressure vessel surface whilst taking
thickness measurements. Measurements are
automatically converted into digital values which are
color-coded to create topographic maps of the vessel
or pipe wall thickness profile.
Multi-scans are then compiled into a composite to show
the complete colour graphic image of the inner surface.
Images (C-scans) from individual scan areas can also be
assembled together to create composite images
covering larger areas of material, and the technique
particularly effective for management reporting or to
observe widespread effects.
James Fisher \ NDT