www.heatingandv entilating.net EMISSIONS SAVING EQ A VING EQUAL TO TA


reinforced pre-insulated polymer pipe system that can operate at temperatur es normalles normally reserved for steel pipes, has been utilised for what is said to be the first time in the UK on a St Helier heat network serving The Merton, Jersey’s largest resort hotel.


During a process of upgrading the site's aging oil-fired HTHW heating and hot water system – including the replacement of a 6MWt steam plant with a 2MWt packaged energy centre – the project's consulting engineer Rambollting engineer Ramboll was faced with the task of replacing the existing steel distribution pipe system to feed the various pr


stem to feed the various properties around the site. Sue Follow


at the available pr ollows, building services engineer with Rambol building services engineer with Rambolll, explains: “We looked


at the available pre-insulated pipe systems on the market and whilst pre- insulated steel pipes are a proven solution, we were drawn to the corrosion-free characteristics of polymer systems and the opportunity to lay the systems directly underground.


“Needing to operate the new primary distribution system at flow temperatures up to 95°C in order to satisfy the loads from the secondary systems in each of the connected properties, we were concerned that materials such as PEX and PP would not achieve an acceptable design life at the continuous temperature rating and also be beyond the upper limits of what would be considered safe.


“During our research into viable options, we were introduced to a new flexible pre-insulated composite polymer system that has a polymer service pipe reinforced with aramid fibres, meaning that it can safely operate at temperatures of up to 115°C and pressures of 16 bar,r, comfortably above our requirements.


of 16 bar


“This system, known as Hiline FibreFlex Pro, offered the design life we required, plus being polymer based meant it had none of the corrosion risks associated with steel.”


offer Mark Whettall Whettall, managing director of CPV says: “Aramid fibres are AKING


Pipes, valv


lves & fittings TAKING 383 CARS OFF THE RO bullet THE RO AD


commonly used in items such as bullet-proof vests and ar e


renowned for their mechanical strength and ability to withstand high temperatures – making them perfect for use in this application. “With the service pipe being reinforced with a mesh of this material, it enables the wall thickness to be reduced when compared to normal PEX pipes, which provides additional space inside the casing for a thicker lay er of bonded PUR insulation and greater flexibility during installation.


all installation. This results in


improved thermal performance, with heat loss levels lower than alternative systems using Series 3 insulation thickness for sizes up to 80mm diameter and lower than Series 2 for larger sizes.”


In total, some 683 metres of Hiline FibreFlex, ranging in dimensions from 50 to 160 mm, was installed – rolled out dir trenches excavated in parallel to the e


disruption to the hotel’s supply. Where required, service pipe joints were made using a unique hydraulic press fitting that negates the need to expand the service pipe end as normally found with press fittings for PEX systems. The upgrade to the hotel's heating and hot water systems will


the service pipe end as normall substantiall equivalent to taking ar


substantially reduce operating costs for the hotel’s owner Seymour Hotels of Jersey, and annuall and annually prevent around 613 tonnes of carbon emissions – equivalent to taking around 383 family cars off the r oad.


stems will r,,


s off the r


as installed – rolled out directly from coils into pre-prepared avated in parallel to the existing concrete ducts to minimise


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