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Ten kilometres north of central Umeå are two of Umeå Energi’s power plants, Dåva 1 and 2, with waste and biomass boilers that provide the region with energy. The first plant – Dåva 1 – was built in 1999 and has therefore had time to be tuned up properly. A number of maintenance needs have also become apparent such as the need for a new superheater.

Niklas Jakobsson, plant owner of waste boiler Dåva 1, explains that the need for a new superheater was discovered during an audit in 2011.

“After doing some calculations, we decided that we would invest in a new combination of materials. The principle and the base are the same as before, but the surface is coated with two millimetres of Inconel 625.”

The reason was they wanted to extend the change interval of the superheater. With the new material, every tenth year may be enough, instead of every third or fourth year as needed before.

“It is a more expensive material, of course, but overall we expect it to be more profitable. Especially as we see that the fuel is not getting ‘kinder’, the risk of corrosion seems to increase all the time.”

 

Complex preparatory work

Jernbro won the turnkey contract to replace the superheater in the procurement process.

“Time was an important factor in the contract, because we knew which weeks in May were possible – the replacement should occur at the same time as we had our normal auditing stop. And then it was important that the supplier could handle the complex preparatory work and be one hundred per cent ready when the time came. The new equipment had to meet all standards and requirements, so the manufacturing part was critical,” says Niklas Jakobsson.

Another aspect that was important to him was communication. He wanted to be informed of any deviations from the schedule and to be able to align with other contractors Umeå Energi was using during the same period.

“Jernbro managed it very well. For example, we had one situation when we risked delay and then they added extra resources and increased the pace until it was resolved.”

Another part of the assignment was to take care of all official controls required under the Pressure Vessels Ordinance, which controls everything from permit to execution.

“Good material can be totally worthless in practice if we don’t have the documentation needed. Another control element was connected with the working environment,” says Niklas Jakobsson.

“We have very high demands on the working environment at Umeå Energi. So in the bigger jobs, we do inspection rounds ourselves, but the Swedish Work Environment Authority is also here regularly on inspection.”

IMPRESSED BY THE WORK

Jernbro won a further procurement contract with Umeå Energi. This time it concerned the replacement of two other parts on the superheater and changing parts of a panel wall in the furnace.

For this assignment Jernbro got considerably less time than normal for preparatory work as Umeå Energi was forced to reschedule the work when their audit supplier went into bankruptcy.

“I am impressed by how Jernbro has handled the work so far. We signed the contract in June and the audit will take place in September.”

He adds that it was never an option to have the audit later as they then start to come into the energy-intensive period of the year – quite simply because it gets colder.

“In general, we are extremely keen to reduce the number of unplanned shutdowns in winter. It has a lot to do with economy. One day of downtime in Dåva 1 costs us twice as much during the winter as it does during the summer – and we are talking big money,” says Niklas Jakobsson emphatically.

JERNBRO GATHERS FORCES

Håkan Persson is Jernbro’s project and assembly leader at Umeå Energi.

“We are very proud of getting these assignments, which are extremely critical for operations at Umeå Energi. One of the reasons Jernbro won the contract is their sound experience of similar projects,” says Håkan Persson.

“We have people who have worked with a variety of assignments at plants in western Sweden. We can benefit from their experience in an assignment like this.”

He also sees Jernbro’s ability to gather forces in a short time as an important factor in Umeå Energi being satisfied with deliveries so far. We can call in competence from different areas when needed. This is very useful in many situations.

“I am impressed by how Jernbro has handled the work so far. We signed the contract in June and the audit will take place in September.”
Niklas Jakobsson, plant owner for the waste boiler Dåva 1, Umeå Energi.

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Urban Sjöström, Skultuna (Mid-North) Regional Manager Mid-North +46104830492 Email

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