Heat Network Hot Tap Connection

Successful DN200 Twin Pipe Hot Tap Connection to a live pressured network without any customer disruption.


The project, connecting a new customer to the existing Veolia heat network, required a live connection to be formed in to the existing heat network without service interruption. The live connection, once facilitated, was extended using DN100 Series 2 pre-insulated pipe to a new plate heat exchanger located in the basement of the building.


Once the excavation of the existing heat network had been completed and the existing DN200 twin pre-insulated pipe exposed, the Eneteq technicians got to work removing the pre-insulated outer jacket of the pipe to expose the steel carrier pipe. A new strengthening saddle was welded to the carrier pipe before attaching the bespoke hot tap valve assembly.

Eneteq operatives then attached the Hot Tap drilling tool to the valve prior to drilling the live main. Once the penetration was completed the hot tap drill was removed, sealing the live network against the hot tap valve and permitting the future work to the building to be completed safely.

Both bespoke connections were then insulated in the trench using the flexible and adaptable Mittel non-standard joint which was manufactured on site to suit the connection location/angle by the Eneteq technicians.

The pre-insulated series 2 pipe was then installed in the traditional manner between the hot tap connection and the PHE substation.

Eneteq’s directly employed heat network technicians received extensive training in Sweden over a two-year period and are now amongst a very select number of UK based resources who are qualified and certified to undertake the hot tapping operation on live heat networks.


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