Slickline Services
At PNS we fully understand the unique challenges that can be presented due to
the cryogenic nature of the LNG industry. From design philosophy through
construction and into start up PNS have tailored our service offerings to improve
safety, efficiency and quality during the complete project. PNS have been involved
in several major LNG terminals across many countries.
Design
PNS engineers have assisted with design reviews
of LNG terminals in order to assess the
constructability, testing philosophy and future
maintenance requirements. A good up front
understanding of the project requirements is the
first step to achieving a clean start up. This is
especially important when a fully welded plant is
being considered as this can create different
potential problems.
Construction
It is during the construction phase of any project
where efficient working can offer the most
significant benefits, Whether working for a
construction company, EPC contractor or end
user , PNS can offer improved working efficiency
by utilising our multi-skilled work force. One of
the most important activities during this phase is
the pneumatic pressure testing, PNS have
implemented tried and tested procedures and
safety systems to ensure that every precaution is
in place prior to these operations being carried
out. At PNS we believe it is important to work
towards the start up of the facility from day one,
In this way systems can have all critical joints
torque/tensioned and tagged, be camera
inspected, pressure tested, high velocity blown
and even dried to a certain extent during the
testing phase, This can lead to early handover of
systems and drastically reduce the time required
for pre-commissioning.
Pre-Commissioning
Prior to the start up of any LNG terminal certain
requirements must be met, these can include:
All Critical joints correctly assembled
and tightened
All spades and spacers in the correct position
All cryogenic systems dried (-60˚C Dewpoint)
All Non cryogenic gas systems dried
(-25˚C Dewpoint)
All Hydrocarbon systems leak tested.
All Hydrocarbon systems Oxygen free
(Less than 2%)
PNS - Al Arabia Industrial Services (AIS) can
facilitate all of the above requirements using our
well trained, multi skilled work force together
with our fleet of purpose built state of the art
equipment.
Start Up
The most critical time of any oil & gas project is
the start up phase, even more so on an LNG
terminal as the first cargo can be waiting to be
unloaded. Using our proprietary cool down
system which are designed to supply only cold
Nitrogen gas, PNS are able to reduce the wall
temperature of the terminal unloading header to
temperatures down to -140˚C in a short period
of time, This can allow the first cargo to be
discharged straight into the unloading system with
less concern worry of pipe work movement due
to T emperature difference across the pipe wall. A
typical example of this was the Dragon LNG
project in Milford Haven UK where PNS cooled
the 2800m 30” unloading system uniformly to -
120˚C in 48 hrs, a total of 700 tonnes of Liquid
Nitrogen was required for this operation.
A wireless temperature transmitting systems was
designed and installed by PNS to monitor and log
the top/bottom of the pipe work every 100m
and the Nitrogen inlet flow rate and
temperatures. This information could be viewed
in real time in the central control room which
improved the overall operation.
