The development of technology helps us deliver affordable, reliable, economical energy that can benefit our world. The technology behind us not only help us find the sufficient way to explore new material, new solution in composite pipe field, but also replace current composite/reinforced pipe under lower costs. The new generation of thermoplastic composite pipe (TCP) now benefits oil & gas and water supply industries. These data enable us to develop and manage global assets efficiently. It also provides us great opportunity to step up into more scalable, economical new resources while reducing environmental damage.
What is general RTP pipe and bonded RTP( known as TCP)?
The reinforced thermoplastic pipe (RTP) as well known as flexible composite pipe (FCP) is generic term referring to a reliable high strength synthetic fiber (such as glass, aramid or carbon) or high strength steel wire reinforced pipe system. It is an alternative to traditional pipelining materials. It consists of three basic layers including a thermoplastic liner, helically wrapped continuous high-strength fiber reinforcement and an external thermoplastic jacket.
Typically, the materials used in the construction of the pipe might be polyethylene (PE), PA11 or PVDF and may be reinforced with aramid or polyester fiber or high strength steel wire, although other combinations are used. It is available in coils up to 400 m (1,312 ft) in length. The pipes are available in pressure ratings from 30 to 450 bar (3 to 45 MPa; 435 to 6,527 psi). Recent innovations include gas tight RTP and RTP for high operating temperatures.
The general RTP pipe is unbonded cause the holt-melt adhesive is made from Polyethylene (PE) matrix. The hot-melt adhesive is used to stick the inner lining and the outer jacket to the reinforced layer and it fully integrates with the HDPE when it is heated together. It is used in lower pressure and less demanding temperature applications compared to the fully bonded TCP (thermoplastic composite pipe).
The thermoplastic composite pipe (TCP), which named bonded-reinforcement structure of RTP pipe, also consist of reinforced thermoplastic composites, quite similar as general RTP pipes, they are suited to higher pressures and a greater temperature range for following reasons. First, some bonded RTP(TCP) uses higher performing thermoplastic resins, such as PEEK, and/or carbon fiber. Second, TCP pipe reinforcement layers are bonded to each other through melt-fusion, which yields higher performance properties than RTP made from the same materials.
The history of RTP and TCP pipe
RTP – Initially developed in the early 1990s by Wavin Repox, Akzo Nobel and by Tubes d’Aquitaine from France, who developed the first pipes reinforced with synthetic fibre to replace medium pressure steel pipes in response to growing demand for non-corrosive conduits for application in the onshore oil and gas industry, particularly from Shell in the Middle East.
Because of its expertise in producing pipes, Pipelife Netherlands was involved in the project to develop long length RTP in 1998. The resulting system is marketed today under the name SoluForce. More recently the technology of producing such pipe, including the marketing, rests with a few key companies.
To be able to withstand high pressures, a reinforcement layer was added to the flexible thermoplastic pipe. Hence the name ‘Reinforced Thermoplastic Pipe’, or RTP.
TCP- TCP pipe concept started in the ’1980s. One prominent development was made in France by Institute Francais de Petrole (IFP) and Composite Aquitaine who developed a small diameter thermoplastic pipe for the choke and kill lines. These were discrete pipes in which a steel inner pipe was overwrapped with thermoplastic composite.
In the ’1990s there was a next wave of composite pipe development and specific conferences were initiated, like the CMOO-series (Composite Materials for Offshore Operations). The first conference in 1993 for example had almost 400 pages of projects on composite developments! Another area of interest in the ’90s was the development of thermoset spoolable composite pipe. Two applications were envisaged, being composite coiled tubing to be used inside the well and small diameter flowlines.
Frontrunners were companies such as Fiberspar (US), Hydril (US) and Compipe (Norway). The brittleness of the thermoset material proved to be problematic: when a pipe is bent, micro-cracks are formed and these give issues when the pipe is used inside the well, where temperatures and pressures are high. Fiberspar emerged as a leading supplier in spoolable onshore composite pipe and developed into a commercially successful company.
What is the structure of the RTP pipe and TCP pipe ?
Both RTP pipe and TCP pipe comes up with three basic layers : an inner thermoplastic layer, a continuous fiber reinforcement wrapped around the pipe, and an outer thermoplastic layer.
Inner layer generally comes up with polyethylene (PE100), inner layer can also apply PERT-1, PERT-2, EVOH etc. material as core pipe (inner layer).
, RTP pipe reinforcement layer is unbonded structure, which consists of separate unbonded polymeric and metallic layers, which allows relative movement between layers.
Post time: Aug-25-2020