Microflex insulated flexible underground pipe

Microflex pre-insulated flexible pipe system. Microflex comes in single coil lengths of up to 100m which means you can have continuous pipe runs without joins. Installation is quick and easy; Microflex copes very well with bends and curves in the runs and, unlike some other systems, you do not need to weld joins and connections. Microflex is ideal for smaller applications like carrying heat to a single house where the boiler room is a little way away, which is a common occurrence where you have a log gasification or pellet boiler in an outbuilding. Microflex is also ideal for larger district or community heating schemes where several houses are serviced by the one boiler. Here you would commonly run one heating loop or 'main' using Microflexc Duo pipe which has two pipes one of which you would use as to carry the hot water (the flow) and the other for the cooler returning water (the return). Each house then connects to the loop drawing off as much heat as is needed.

Microflex can also be used to carry potable hot or cold water - so water for drinking, washing or bathing, Microflex Quadro which has four pipes in total you can carry water for heating as well as potable water or you may choose to use Microflex for cooling or waste water applications.

Microflex is very well insulated so heat losses are kept to a minimum. You have a choice of outer diameters with Microflex of either 160mm or 200mm. Of course the 200mm is the better insulated of the two but even the 160mm is very acceptable. As an example lets say that we are using a 10m run of Microflex duo pipe with an outer diameter 160mm and two internal pipe 40mm water pipes. We use the pipe to supply heat to a house with a flow temperature of 70°C and a return temperature of 40°C and a ground temperature of 5°C. The total heat loss would be less than 200W/hr - very low.

To install Microflex a 100mm layer of pea gravel is laid in the bottom of the trench, next comes the the Microflex, pea gravel to 150mm over the Microflex, warning tape and then fill in the trench. If vehicles will be driving over the trench then the overall depth should be around 1100mm, if not then 700mm. Even though the corrugated dual layer outer casing of Microflex is flexible it is still very stable and tough; you would have a job on your hands to crush or damage it.

You do not have to run Microflex underground, another application is for surface runs inside bold buildings such as a barn or workshop where you need a tough, very well insulated pipe. On a past project, a small district heating scheme in Devon, we run Microflex externally for some portions of the runs and then clad it with local larch.

The internal carrier pipes are stable, corrosion resistant, can take pressurised at up to 95°C. The internal pipes come in a variety of internal diameters (20mm, 25mm, 32mm, 40mm, 50mm) to suit the flow rate needed for your particular project. The carrier pipes are made from PE-Xa, a high density, cross-linked polyethylene inherently resistant to chemical corrosion, able to withstand high temperatures and with a non-permeable membrane to stop oxygen ingress.

There are off the shelf components such as T-pieces, straight connectors, dust caps and such-like, as well as end connectors which allow you to join up to your standard pipework.

Model Diameter
10m Pack Microflex125 duo 25 25mm
10m Pack Microflex125 duo 32 32mm
15m Pack Microflex125 duo 25 25mm
15m Pack Microflex125 duo 32 32mm
20m Pack Microflex125 duo 25 25mm
20m Pack Microflex125 duo 32 32mm
25m Pack Microflex125 duo 25 25mm
25m Pack Microflex125 duo 32 32mm
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