2. Specialised
Pigging Modules
Our pigging modules range from small containerised units, for easy transport
to difficult sites, to trailer mounted 20ft and 40ft units. The units are modular
in design, require no additional ancillary equipment for operation, and can be
separated and lifted into inaccessible areas when required.
Our 40 ft pigging module has a liquid storage capacity of 40,000 litres, making this the only unit in
Australasia with the ability to Pigg® up to 350 metres of DN 400 (16”) in a fully closed circuit while
returning all waste streams to the unit.
Permanent
Location Option
Contract Resources can also provide clients
with resident pumping modules on site. This
gives the client immediate access to equipment
in emergent situations, removing the potential
equipment mobilisation lead time should the
need arise.
Minimal Client Involvement
& Impact on Site Resources
The client is only responsible for providing
pipeline access to the launch and retrieval point,
fresh water supply, and effluent discharge.
Due to the ability to close circuit Pigg®
, pipeline sections
up to 400 metres long can be cleaned in one set up. This
minimises line breaks, subsequent mechanical works, and
access requirements for overhead lines. Contract Resources
supervisors coordinate all operations with the client prior
to and throughout the pigging operations to ensure the
pipeline has been prepared as required, and that all safety
and site specific procedures have been adhered to.
Interior of a 40 ft clean water tank A 40 ft pigging module is completed in a CR engineering bay
SETTING NEW STANDARDS
3. Throughout the process, pig travel
and pipe cleaning are continuously
monitored, and hydraulic driving
pressure and “flow rate values versus
time” is recorded.
The resulting pressure profile measures the resistance to
pig travel, enabling the operator to determine the location
of fouled sections and the extent of the deposit build-up.
The recorded data of the pig propellant pressure clearly
delineates the fouling extent and pig travel. Clean return
water with consistent pressure and flow data signifies that
the progressive pigging program is completed.
A final pressure profile is obtained and recorded, and
compared with the initial pressure profile. This information
is available to the operator and client for confirmation that
all deposits have been removed from the pipeline.
01. A pressure profile before and after cleaning, showing the increase in
pipeline flow rate. 02. A computer model of a Pigging clean inside a pipeline
Continuous Monitoring
02.
01.
Utilising water as the propellant medium in a closed circuit configuration prevents all spills to grade,
and the solid/liquid separation system minimises the generated waste stream. The patented unique
closed circuit pigging process presents the least risk to the client, the operators, and the environment
available to the market today.
Environmental Advantages
A 20 ft modular container set up onsite for Pigging operations Removal of scale from a pipe section
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4. The Patented
Process
The DDT process is the safest, most environmentally friendly method for
removing pipeline debris.
01.
02. 03.
04.
01. Removed scale build-up in front of a DDT Pigg®
02-04. Specialised Pigg®
launchers setup on client pipelines
SETTING NEW STANDARDS
The DDT process employs a closed loop, self contained
hydraulic system and is the holder of 17 patents worldwide.
Contract Resources are a licensee for the use of this
technology. It is the only pigging technology that is able
to remove mineral laydown and hard scale deposits
from pipelines.
The process uses no chemicals and works at ambient
temperatures, with water being the propellant medium;
process water can also be utilised to further reduce
any environmental impact. Contract Resources is proud
to have played a significant part in the endeavour to
reduce unnecessary emissions; we have incorporated
environmental considerations into all areas in the design
and construction of our cleaning systems and the ensuing
operation of our pumping modules.
The pigging process is bi-directional, allowing the cleaning
Pigg®
to traverse the pipeline in both directions. It is the
only process that can direct the Pigg®
to travel repeatedly
over an isolated contaminated section of pipeline; this
expedites the cleaning process and abates non-productive
Pigg®
runs over unfouled pipeline sections.
5. 01. Different appendages designed to fit into Pigg®
bodies for different types
of scale and build up 02. A selection of Piggs®
03. View of the cleaning
studs on a Pigg®
body
The DDT Pigg®
is a compliant and flexible cleaning device key to the cleaning
process. This polymer Pigg®
is available in diameters from 50mm (2”) to 914mm
(36”). The Pigg®
can negotiate short radius elbows and U-Bends with ease,
obstacles that have long defeated conventional pigs.
Pressurised water, supplied from a pumping module, pushes a flexible pig
through the fouled pipeline. In the process, the appendages erode and remove
deposits. A controlled amount of the water flows around the pig and past the
appendages, flushing the loose deposits ahead of the unit and into the solids
separation system.
The DDT Pigg®
Pigging Process
Each Pigg® carries an array of interchangeable cleaning
appendages, each of which is threaded into the body of the
Pigg®. These cleaning appendages are radially dispersed in
a clockwise or counter clockwise configuration to provide a
complete, 360° cleaning action. The Pigg® size, number of
appendages and their specific selection, as well as height
are all matched to each stage of a cleaning run.
Liquid bypass around the Pigg® removes deposits from the
Pigg’s® path, eliminating the possibility of pig blockage - an
unparalleled feature of the Pigg®. It is also the only Pigg®
design that incorporates interchangeable appendages,
allowing the operator to adapt to any conditions
encountered and provide optimum cleaning performance
in the shortest possible timeframe.
The appropriate diameter pig, height, type of appendages,
and amount of water to bypass the pig is all determined by
the operator. A series of valves controls the direction the
pig travels.
Since the fouling may not be uniform throughout the
pipeline, the Contract Resources operator has the ability
to direct the pig to travel over the most fouled section as
required. This bi-directional Pigg® control method is a
patented process. A significant benefit of the directional
control is that it also permits the cleaning of pipelines
with changing pipe diameters. The DDT process operates
nominally in a pressure range of between 75 to 200
psi, eliminating the risks associated with HPW cleaning
methods.
02.
03.
01.
The 40 ft Pigging module set up on site
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6. Chemical Pigg Trains
Clean and Gauge
Chemical Pigg Trains are used to
achieve Pre-Commissioned Pipeline
Pigging requirements together with
the following objectives:
• Environmentally friendly
• Minimisation of the volume and hence the
cost of chemicals required
• Minimisation of the transport and disposal
costs of spent chemicals
• Ensure complete internal surface contact
with the cleaning chemicals
• Offer visual confirmation of pipe wall
cleanliness
The cost and environmental benefits of this system are
enormous. As an example, to clean 100 meters of 150mm
(6”) pipe via the traditional method would require 3,200
litres of chemicals per run. With the batching technique,
chemical usage is down a massive 96%; to just 128 litres
per run. This equates to considerable financial savings for
clients in both the purchase and subsequent disposal of
chemicals and resultant residues.
SETTING NEW STANDARDS
Contract Resources provides pre ILI inspections
and routine pipeline cleaning programme
services to clients across Australasia, with a
large inventory of piggs (6” - 30”) and tracking
equipment in stock in Australia to assist with
emergent cleaning runs as required.
Pigg
Pigg Tracking equipment
Cup Pigg
STAGE ONE
Removal of heavy Corrosion
scales using select pigs and
nitrogen gas for propulsion.
Nitrogen (N2
)
STAGE TWO
Chemical Train using
batched chemicals for
cleaning, passivation, and
hydrocarbon removal.
STAGE THREE
Final drying and inspection
wiping using select drying swabs.
7. Decoking Fired Heaters
The Pigging System, pioneered by DDT, is the most advanced system for decoking
fired process Heaters and Furnaces. It is a fully proven and extremely effective
process that removes even the hardest coke and scale from heater tubes.
The DDT Service
• Complete deposit removal • Increased Capacity
• Greater run-lengths • Higher heat fluxes
• Lower fuel usages • Longer tube life
• Reduced environmental emission
Greater run-lengths are accomplished by polishing
the inside surface of the tubes with specially designed
appendages. Contract Resources’ new 40ft unit out-
performs all competitor single and two pass trailer units.
Intelligent Pigging
DDT International and Contract Resources have worked
alongside many of the world leaders in Intelligent Pigging.
We are also able to assist with internal inspection of
pipelines by means of intelligent pigging.
We have complete confidence in the quality of our service.
Our dedicated and qualified service personnel will safely,
effectively, and efficiently fulfill all pigging requirements.
The CR guarantee
We guarantee the complete removal of pipeline deposits;
improving performance while increasing reliability, flow
rates, and capacity. DDT has a proven track record, having
begun pigging operations in 1991. It is the only company
with a patent for selectively cleaning contaminated
sections only.
Industry Sectors and
Services Facilitated
• Refinery Heaters • Process Heaters
• Transfer Lines • Power Plants
• Chemical Plants • Steel Mills
• Sewage Treatment Plants • Pulp Paper Mills
• Mines
• New Construction
• Onshore and Offshore Pipelines
• Removal and conditioning of
Internal Weld Seams in Tubes
A diagram of the Pigging system set up
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The process removes this build-up from heater tubes in
a series of highly controlled incremental cleaning runs.
Because the process is much more effective than steam-air
decoking, chemical cleaning, or any other mechanical
cleaning method, the economical benefits of an increased
run length, longer tube life, lower fuel usage, and improved
heater reliability are assured for as long as possible.
DDT’s bi-directional Pigg® control method facilitates
the cleaning of heaters which incorporate reducers and
changing pipe diameters, without having to make any
modifications. It will also permit closer attention to the
most contaminated section of a heater, further optimising
the cleaning process.
8. FOR FURTHER INFORMATION CONTACT // www.contractresources.com
NEW ZEALAND
Auckland Office
Phone: +64 9 2652 083
Fax: +64 9 2652 084
Email: crnz@contractresources.com
AUSTRALIA
1300 66 11 91
Sydney Office
Phone: +61 2 8723 2111
Fax: +61 2 8723 2199
Email: sales@contractresources.com
MIDDLE EAST
Abu Dhabi Office
Phone: +971 2 5504 355
Mobile: +971 503 790 986
Fax: +971 2 5504 357
Email: crme@contractresources.com
SOUTH AMERICA
Chile Office
Phone: +56 99 8223 894
Fax: +56 32 2133 222
Email: crsa@contractresources.com
USA
+1 855-CHR-4CAT
Houston Office
Phone: +1 281-538-0529
Fax: +1 281-538-6370
Email: service@catalysthandling.com
Contract Resources has equipment spread throughout
Australia, New Zealand, North and South America, and the
Middle East; ensuring fast mobilisation.
Global Network
