PRESSURE PIPE | MATERIALS
In one example, Jean-Louis Poisson, lead polymer materials engineer at Baker Hughes, described the use of spoolable composite pipes in high-temperature, high-pressure installations. Poisson said that composite pipe has compara-
ble strength to steel, but superior durability. Installation cost was also far lower. Other advan- tages include high corrosion- and erosion-resist- ance, flexibility and ease of installation. Pipe up to 8in diameter typically uses separate polymers – such as HDPE, PA or PPS – in various layers, including a base liner, tie-bond layer, centre layer (for high-temperature strength), a reinforce- ment layer and an abrasion-resistant jacket. Such a structure will have around 25% of the carbon footprint of steel, he said. He estimated the time and cost of installing
20km of pipe made from either steel or compos- ites: a steel line might require nearly 1700 connec- tions and take 24 weeks to install – by 30 workers – at a cost of US$10 million. The composite line, in contrast, might need 70 connections, which could be carried out by three workers in one week – at a cost of around US$40,000, he said.
Pipeline renewal Recently, Kier Infrastructure installed more than 13km of Aliaxis PE100 pipe in a UK pipeline renewal project. The project will replace existing glass-reinforced pipe (GRP) – which tended to rupture and leak – with GPS PE Blue pipe from Aliaxis. The pipe will upgrade the connection from a pumping station to a reservoir to deliver potable water to residents of the Cotswolds. PE100 pipe, 1200mm in diameter, will replace the GRP pipe, which was originally installed around 20 years ago – and had consistently failed. The design of the new pipeline started around eight years ago – which included advice on the installa- tion and benefits of PE100.
“It was decided to lay the majority of this
replacement pipeline in PE due to its flexibility and speed of installation,” said Nigel Gascoyne, key account manager at Aliaxis UK. “We’re the only company in the UK that can produce PE100 pipe to 1200mm sizes.” Andy Muncer, project director at Kier, added:
“While we considered a steel pipe, we selected the GPS PE Blue as a proven, economic solution. There
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