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  • Oil Tank Replacement with Pipe in Pipe fittings

    We have just completed a major oil tank replacement project on a site near Blackpool. Our scope of works was to remove existing oil tanks which were installed over 20 years ago and had become corroded and were leaking from the tank and the pipework that lead to and from it.

    The first of the old oil tanks is removed from site ready to be loaded for transportation

    The first of the old oil tanks is removed from site ready to be loaded for transportation

    The remaining oil tank in situ waiting to be removed

    The remaining oil tank in situ waiting to be removed

    The second tank is out now too and in the background you can see the first tank already loaded

    The second tank is out now too and in the background you can see the first tank already loaded

    A cleared site all ready for the new tanks, but first we need to sort the pipework

    A cleared site all ready for the new tanks, but first we need to sort the pipework

    They have been replaced with two new 20,000 litre tanks which will eradicate any leakage and allow the installation of an automated leak detection system. But more of this below.

    The process of removing the tanks was a tough one as the existing tanks weighed nearly four tonnes each and had to be removed from the site using a crane and then taken away for recycling on a low loader.The new tanks which carry a similar weight were purpose-built to sit on the existing concrete plinths that held the previous tanks.

    The two new tanks ready for the oil tank replacement arrive on site ready to be craned into their positions

    The two new tanks arrive on site ready to be craned into their positions

    Lifted over the building and into place, the first of the new tanks arrives

    Lifted over the building and into place, the first of the new tanks arrives

    oil tank replacement complete with Ladder and inspection system installed and they are almost ready to go

    Ladder and inspection system installed and they are almost ready to go

    Once in place the new tanks were connected to all new pipework that leads into a dual fuel burner.

    The new below ground pipework was a first for us as we used a twin walled ‘Pipe-in-Pipe’ material. This is a relatively new technology that has become the norm in oil and gas movement. Pipe in Pipe, as the name indicates, is made up of an inner pipe where the oil flows through with a second pipe surrounding it, that protects the inner pipe and adds a few extra benefits too.

    It offers the highest level of environmental protection and in this case has been installed with an automated leak monitoring system, so if the inner pipe begins to leak, this is detected and the system notifies the operator of an issue, before it gets chance to breach the outer pipe. Not only this, as it’s HDPE (High Density Polyethylene) it’s also corrosion resistant too, so should last for many years to come with little ongoing maintenance.

    And with oil tank replacement the lengths of pipe are increasingly being joined using electrofusion welding. This is an incredibly clever process, as the couplings have copper wire embedded into them which when heated cause controlled melting of the inner pipes and create a permanent and leak free join, without the risk of sparks that conventional welding brings – never a great idea near oil tanks.

    If you’ve not seen electrofusion in action before, here’s how it works.

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