DMT to inject biogas into Cadent’s LTS network

DMT Environmental Technology will inject biogas into the higher pressure local transmission systems (LTS) network in the UK using Hexel One plastic pipework.

DMT has partnered with Cadent and Storengy, a subsidiary of ENGIE, for the project.

LTSs are the ‘pillars’ of the national gas grid network in the UK, said DMT, and distribute gas from offtakes to towns and cities throughout the country. The LTSs are used to store natural gas at higher pressure.

The density of gas can change depending on the pressure. Increasing the pressure will influence the gas that will change the space between the gas molecules, and the molecules will be packed closer together. This results in more efficient gas storage because more gas can be carried to the storage facility. Bringing the pressure down will have the reverse effect.

“In the next 15 years, we will see larger projects similar to these projects where we are developing projects in collaboration with our partners, aiming to be more time-efficient and lower CAPEX costs,” said Stephen McCulloch, business director for DMT Environmental Technology.

This new project demonstrates DMT's ability to build a project for higher pressure grid connections. The development opens a new market aiming at larger projects that enter a higher-pressure network. The DMT team is working hand in hand with Cadent, which owns, operates and maintains the largest natural gas distribution network in the UK, to deliver the project’s LTS connection. Using Hexel One plastic piping instead of the traditional steel has seen ‘considerable savings’.

The scope includes a two kiosk GEU and ROV with a high-quality biomethane compressor to meet the higher pressure demands of the LTS network. DMT’s scope continues with a pressure reduction system incorporated for the supply of gas to the onsite combined heat and power (CHP) and all associated works.

Since the introduction of the Renewable Heat Incentive, the industry has seen the tariff level drop and with this, the demands of cost savings have been ‘paramount’ to projects being signed off by funders, said DMT. This brings new expectations from funders wanting to not only cut costs but also shift risk towards developers and suppliers. They are looking to guarantee the feasibility of a project and ensure deadlines are met to secure such tariff levels.

“It’s my belief that using higher pressure pipelines for biomethane injection is a key to sustainable growth for projects under the Green Gas Support Scheme format,” said McCulloch.

Higher levels of biomethane in tier 1 injection brings its own challenges with grid capacity in the summer. DMT said it can assist in these projects by injecting into the higher-pressure networks and reduce the risk of capacity issues and even the need for propane to be added within the biomethane.

The biogas upgrading plant at Deal Farm will enable the commercialisation of biogas delivered from AD with an agricultural waste-based feedstock. It is expected that the plant will produce 5 million cubic metres of biomethane annually.

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