PPSA Member Case Studies
Our members have completed many challenging projects. By way of example, some of them are described here.
Members can submit their own case studies by contacting .
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Jee’s client was developing a number of fields in the Mediterranean Sea. As part of this
development a new subsea pipeline was to be laid carrying produced gas from two separate
wellsites to a tie-in to an existing larger diameter export pipeline. The pipeline system
was being designed to accommodate pigging operations through the field life. These pigging
operations would require pigs to be launched and received subsea, using diverless subsea
pig traps.
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Jee undertook the technical management and campaign design of in-line inspections of two deep water,
high pressure flowline loops from an FPSO in Angola. The campaign included inspections of clad pipe
sections and flexible risers, and was the first time either pipeline had been pigged during operation.
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BP asked Jee for support with the assurance of an emergency shutdown valve (ESDV) overhaul. The project
proposed to use a remote isolation tool downstream of the ESDV, where it would be set with the aim of
providing a safe isolation barrier to allow repair or replacement. BP operate the pipeline but a third-party
operates the platform where the ESDV is located, who were responsible for the execution of the work. BP took
an assurance role in the project with our support as an independent advisor.
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A major North Sea operator were planning the de-commissioning process for a number of interconnected fields,
comprising of fixed platforms, subsea structures and both interfield and export pipelines and umbilicals.
Jee was contracted to assess the options for flushing, pigging and conditioning of the pipeline infrastructure
and to advise an optimised base case cleaning methodology to be taken forward to the detailed engineering phase.
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Petrogas E&P Netherlands owns and operates interests in the A and B blocks in the Northern sector of the Dutch
continental shelf. In 2015, Petrogas requested that we review the sphering strategy for one of the existing
gas pipelines and a new gas pipeline soon to go into operation.
Removal of liquids from gas pipelines is crucial for maintaining pipeline integrity. The liquids are a potential corrosion threat as well as having flow assurance implications if the quantity of liquid in the pipeline becomes excessive for handling at receipt. There is therefore a high importance on optimisation of sphering strategies for maintaining operability of pipeline systems whilst minimising the number of sphering operations required.
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The inspection tool “Piglet” is based on ultrasonic technology. The inspection results are
displayed directly on-screen via an unique developed glass fibre optic module.
For standard steel, ultrasonic technology makes it possible to identify corrosion area’s
and to determine accurately the remaining wall thickness.
However in the water and waste water industry pipelines consists of other materials than steel. Normally PVC, HDPE, asbestos cement, cast iron and concrete lined steel pipes are used, which need another approach to determine its integrity. For these types of materials the degradation system is not fully known yet and other parameter than the remaining wall thickness could be important.
A. Hak Industrial Services has started a trial and error approach. Together with the water and wastewater industry some critical pipeline types were identified and were inspected using the existing ultrasonic Piglet technology.
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Weatherford P&SS have successfully completed the full precommissioning and start-up suite of
activities on over 1,000 miles (1600km) of pipelines for Starstoi on the Sakhalin II phase 2 pipeline
project. This was followed with full nitrogen commissioning works to bring oil and gas onto the
environmentally sensitive Sakhalin Island. Utilising strong environmental procedures and controls to
avoid any disruption to the key salmon spawning areas, the rare Steller Sea Eagle nesting areas and
general bear population, all facets of the project were completed successfully whilst also overcoming
the key engineering difficulties in this remote and rugged region.
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As part of the construction and
commissioning of the Darwin liquefied
natural gas (LNG) project, Weatherford’s
Pipeline & Specialty Services (Weatherford
P&SS) group performed several important
operations, contributing to the successful
startup of the ConocoPhillips LNG plant with 312.3 miles (502.6km) of 26-28
inch dual diameter pipeline and
188,000m3 LNG tank in
Darwin, Australia.
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During recent years, technology has
allowed the exploitation of oil and gas
reserves in increasingly deeper waters. In
addition to floating production facilities and
tanker transportation, pipeline construction
companies have also developed their
services to facilitate pipeline transportation
of oil and gas reserves from deepwater
installations. As a result, some construction
companies have been required to obtain a
real time solution for a “wet-buckle”
scenario. In an ideal world, construction of
offshore pipelines should be completed
without any incidents. However, in the real
world, and for a variety of reasons,
sections of a pipeline can sometimes
become damaged or even flooded during
the laying process. Such an occurrence of
unplanned flooding of the pipeline is known
as “wet-buckling”. Since a pipeline is most
likely to buckle during deepwater
installation, it is important to have detection
and correction methods in place at this
stage. While few deepwater projects
ultimately require a “wet-buckle”
contingency during pipe lay, construction
companies agree on the benefits of
providing it as an insurance. If any buckling
escapes detection during the installation,
and is only discovered post installation,
then the costs to correct the situation can
be huge.
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The Trans-Mediterranean pipeline, known
as the Libya Gas Transmission System
(LGTS), or Greenstream, is 322 miles
(518km) long, 32 inch diameter. The
pipeline runs from Melitah, Libya, North
Africa to Gela, Sicily, Italy (Fig. 1) and is
located in water depths exceeding 3,600
feet (1,100m).
In an ideal world, construction of offshore pipelines should be completed without any incidents. However, in the real world, and for a variety of reasons, sections of a pipeline can sometimes become damaged or even flooded during the laying process. Such an occurrence of unplanned flooding of the pipeline is known as “wet-buckling”. Since a pipeline is most likely to buckle during deepwater installation, it is important to have detection and correction methods in place at this stage.
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When iNPIPE were approached by National Grid they were challenged to find the safest and
most time efficient manner to change a valve on a LNG storage tank situated at Partington.
Safety was stressed as being of paramount importance as the LNG tanks held temperatures of
minus 160°C.
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