Magma m-pipe® is a unique high strength, light weight pipe that combines high quality Victrex PEEK polymer and Toray T700 carbon fibre. m-pipe® has a monolithic structure from bore to surface.
m-pipe® is highly resistant to corrosion and fatigue, making it the product of choice for subsea use. Typical applications include risers, jumper spools, flying leads and downline applications.
m-pipe® has a density of 20% that of equivalent steel pipe. This simplifies handling and allows the use of smaller vessels to reduce operating costs.
m-pipe® subsea performance advantages:
|1/5 density of equivalent steel or un-bonded flexible pipe||Light weight combined with high strength|
|Monolithic constructions eliminates rapid gas decompression||Better erosion resistance compared to steel|
|High resistance to permeation (100 x that of PA11, PCDF, PE)||Corrosion resistant to seawater and CO2|
|Long life fatigue performance||High temperature operation|
|Fatigue performance unaffected by sour service||Achieves operating strains up to 2%|
|Low thermal conductivity, 10x better than steel||High wear resistance|
m-pipe® is designed to operate at pressures up to 20 ksi (20,000 psi)
When operating within design limits m-pipe® does not fatigue . Extensive cyclic testing shows no knockdown on the long term performance of m-pipe®.
The surface smoothness of Victrex PEEK enhances flow rates compared to steel or un-bonded flexible pipe. For example, 3in ID m-pipe is able to deliver a flow rate 4x that of 2 3/8in ID steel coiled tube.
|Steel pipe||0.4 to 25μm|
m-pipe® light weight and high strength
m-pipe® strength is comparable to high strength steel and operates at strains up to 2%.
This performance, compared with steel and titanium, enables m-pipe® to solve many of the operational and longevity problems associated with the high pressures of deep water production environments.
Typically, an m-pipe® riser or jumper spool designed to match the pressure performance of conventional steel or flexible pipe would be around 20% of the weight.
Example weight of m-pipe® riser and jumper configuration
|3,000m 6in ID 10ksi riser (inc. coating)||In air||550Te||500Te||108Te|
|3,000m 6in ID 10ksi riser (inc. coating)||In water flooded||300Te||324Te||0Te *|
|60m 6in ID 10ksi jumper (excl. connectors)||In air||N/A||6.0Te||1.7Te|
|60m 6in ID 10ksi jumper (excl. connectors)||In water flooded||N/A||4.0Te||0.5Te|
* Neutrally buoyant
m-pipe® corrosion resistance and sour service performance
Whilst m-pipe® is manufactured from only Toray T700 and Victrex PEEK, the inner bore of m-pipe® is pure PEEK.
PEEK has excellent chemical resistance to hydrocarbons, bases, acids and organic / inorganic reagents, even at high temperatures.
In addition Victrex® PEEK gives m-pipe® exceptional hydrolysis resistance at elevated temperatures and pressures.
The table below shows PEEK performance for a range of oilfield chemicals:
Temperature °F (°C)
|Crude oil (Brent crude)||248 (140)||No attack absorption <1%|
|Hydrogen sulphide||347 (175)||No attack|
|Sea water||392 (200)||No attack little or no absorption|
|Methanol||392 (200)||No attack absorption <1%|
|Benzene||212 (100)||No attack little or no absorption|
|Ethylene glycol (50% aqueous)||392 (200)||No attack little or no absorption|
|Corrosion inhibitor (100%)||176 (80)||No attack little or no absorption|
|Naphtha (100%)||212 (200)||No attack little or no absorption|
|Biocide||392 (200)||No attack little or no absorption|
Victrex PEEK, used in the construction of m-pipe, offers the best permeation performance of all polymers available for the manufacture of thermoplastic composite pipe (TCP).
Tests with Hydrogen Sulphide at 17bar show permeation levels at least 100 times lower than PA11, PVDF and PE.
Hydrocarbon mixtures have minimal effect on the permation characteristics of m-pipe®.
Hydrocarbons cause other polymers to swell, accelerating permeation.
Permeation coefficient Q(cm²/s/atm)
Diffusion coefficient D(cm²/s)
|m-pipe®||155||17||6.2 x 10–9||6.5 x 10-8|
|m-pipe®||110||17||1.2 x 10-9||1.3 x 10-8|
|PVDF||100||–||1.3 x 10-6||—|
|PA 11||100||80||6.6 x 10-7||0.8 x 10-6|
|PA 6||30||–||0.3 x 10-8||5 x 10-10|