Click on one of the pictures to read more
Work at the biggest hydropower plant in Norway
Hennes & Mauritz
Akershus Energi Varme
In 2015, Hafslund decided to upgrade and expand Vamma hydropower plant in Glomma Production in Vamma currently amounts to 1,350 GWh per year, corresponding to fully 14 per cent of Oslo’s power consumption. The new unit will generate more than 1,000 GWh per year – 230 GWh of which will be completely new power, with the remainder replacing production from the old units. Vamma 12 delivers greater absorption capacity combined with improved efficiency; it also makes the power plant less vulnerable to outages and loss of production.
Infratek is tasked with installing around 900 metres of pipework in dimensions of 50 to 500 mm, with the associated bends and flanges. The system also features 23 shut-off valves and non-return valves. Moreover, Infratek is to deliver seven pumps in sizes from 2.4 to 170 kW, as well as two cooling water filters with automatic valves.
“Infratek is responsible for the cooling system for the entire facility and for the emptying system. Water cooling in such a huge hydropower plant requires all kinds of equipment, including storage and oil pressure units. Our job is to set up water intakes and to filter the water that flows in at various cooling points in the unit. The pumps we are to deliver will be used to empty drain water and cooling water from the basin,” explains Pål Hystad, fitter and team leader at Infratek.
“It’s is a heavyweight power plant that’s being built and expanded here. Vamma 12 features a head of 28.5 metres, and the absorption capacity of 500 cubic metres per second is simply enormous. By way of comparison, a standard household uses around 150–200 cubic metres of water per year,” he adds.
Infratek employee Emil Glommen Engebretsen is busy joining and welding 6-metre-long sections of acid-resistant pipes that stretch up towards the top of the tall installation.
“The welding technique is called TIG (Tungsten Inert Gas), which means that the pool crater and the electrode are protected by a gas flowing from the welding gun. The protective gas makes it possible to weld in an oxygen-free environment, preventing damage to the weld. The pipes that are being welded together are also filled with back gas – the acid-resistant pipes, that is,” says Glommen Engebretsen.
Installation of the pumps and emptying equipment is set to commence in winter, when the facility has begun to take shape and the various compartments have been poured and built.
Completion in 2019
Infratek has been working on the Vamma project since January 2017, and the project is scheduled to continue until autumn 2018, with follow-up running until May 2019.
“With the work we’re doing on this plant, we’ve had to be involved from the very start because we’re embedding all the pipes in concrete. It’s exciting to have Infratek involved in such a large construction project, where Vamma is cementing its position as the biggest hydropower plant in Norway,” concludes Pål Hystad.
The Vamma 12 project is scheduled for completion in spring 2019.
- The lines we build is in total 7.5 km, says Erik Olsen-Ruud of Infratek.
Together with his colleagues Peter Haugland, Hågen Jellum and Arnfinn Bredesen he is bulding lines to give Sørum municipality a better power supply with the 22 kV distribution grid lines.
- In the project we have transported new poles, stones forfoundations, power lines and other materials on the special vehicle we use for such jobs. There was a lot of mud when we worked in the fall, but it was a little easier when it got colder at night, says Olsen-Ruud.
- In this contract, we have the total responsibility, and this means high demands for service, availability and quality, says Leif Andersson, business developer for railways at Infratek.
The agreement was extended in 2012 and lasts until 2016.
Operation and maintenance contract with functional responsibility for engineering structures, tracks, electrical/aerial lines, signals and telecommunications. Telecommunications also covers passenger information systems (PIS), alarm supervision (SCADA), branch exchanges (PABX), closed-circuit television (CCTV), etc.
- We have had a long standing and close cooperation with Infratek, and we have had a common goal of being Sweden’s most accurate train operator. Arlanda Express has now kept this position for 10 years, says Per Thorstenson, CEO at A-train.
On commission from Stokab, we were involved in the construction of the largest open fibre network in Europe. The assignment involved contacting property owners to offer connection, project planning the network structure, and performing the actual channelisation and fibre work.
Infratek has for several years delivered quality EAS solutions with modern design to Hennes & Mauritz
The project directly cut the customer’s energy costs by 60 per cent – as proved by measurements taken immediately on the conclusion of the contract. The repayment time for the client’s investment was approx. 18 months.
The customer was Akershus Energi Varme.
The project involved upgrading two transformers, one from 315 kVA to 500 kVA (11 kV) and one from 500 kVA to 800 kVA (22 kV).
We have installed switchgear, effect switch and cables at the switchgear facility at Västberga, Sweden. Infratek has also initiated and carried out reporting on capacitors, done ESA-training and given advice on cable dimensioning.
The station is to receive power from a wind farm that is being constructed by Statkraft/SCA in the area.