Hydroram AB

Gullrisgatan 6D

417 20 Göteborg


Phone +46(0)731-002827

Easy to print: resume17bE

Branch of business: Hydraulic consultation in the field of complex pipe system calculations.


We use and develop programs for steady state and transient flow.

The programs are used by us and owners of larger district heating (and cooling) systems.

We also work in fields as mining, black water, oil and process industry.

Examples of work

Hydraulic analyses of present or future district heating (and cooling) systems.

The systems are test driven in models that presents the hydraulic behavior of the systems in various points of operation. Problems as water hammers are solved as god as possible with our knowledge. More then half of the amount of district heating water in Sweden is in our computer models. About two thirds of the power in district cooling systems in Sweden is simulated by us.

Analyses of transient behavior (water hammer) in various systems. In best case we analyse and prevent damages, but sometimes it’s a matter of accident commission.

Education about district heating (and cooling) systems. In round figures a thousand people have had are courses. Most of them are operating staff but also consultants from companies as FVB, SWECO and ÅF have been educated.

International missions

2017 Lusail, Qatar, 1100 MW district cooling system for Marafeq.
2016 Hohhot, China, 2.3 GW district heating project, through Termoekonomi.
2016 Shijiazhuang, China, 2.5 GW district heating project, through Termoekonomi.
2016 Cayuga, USA, Water intake, through Makai Ocean Engineering.
2015, Tara Mine, Ireland, Mine water, Boliden.
2015, Odessa, Sewage pumping, through Pios Ekoklar.
2014 Jinan, China, 1230 MW district heating project, though Termoekonomi AB.
2012 Lipa Swamp, Colombia, Sand/Slurry system trough Flygt pumps.
2011 Lamma Island, China, sewage water trough Flygt pumps.
2011, Lusail, 1100 MW district cooling system, trough Capitol Cooling.
2008, Helsingfors, 1000 MW waste heat from nuclear power plant, for Fortum
2007, Amsterdam, district cooling, trough FVB and Capitol Cooling.
2005, Bahrain, water intake for district cooling, trough FVB/Kattner.
2003, Bandar abbas, Iran, black water, trough ABS pumps.
2001, Baltimore, district cooling, trough FVB/Kattner.
1998, Windsor, Canada, district cooling, via FVB/Kattner.
1998, Riga, Latvia, district heating, trough FVB.
1998, Kralkizi and Gökzu, Turkey, fresh water supply, trough ABS pumps.
1998, Istanbul, Turkey, fresh water supply, trough ABS pumps.
1997, 14 Tunisian pump stations for sewage water, trough Kvaerner Water.
1996, Chicago, USA, district cooling, via FVB.
1995, Doga, Turkey, district heating, troug Gothenburg Energy International.
1992, Edmonton, Canada, district heating and cooling, trough FVB.


Ola Rossing

Education: Bachelor of Science, Chalmers University of Sweden (CTH).

1987-1989 Science engineer, flow machinery, CTH

1990-2003 Ola Rossing AB

2003 – Hydroram AB

Gunnar Larsson

Education: Phd on dynamic of district heating systems , CTH.

1999-2001 Halftime as researcher, thermo and flow dynamic, CTH.

1999-2001 Halftime on Ola Rossing AB

2001-2003 Ola Rossing AB

2003 – Hydroram AB

Customers producing energy :

Affärsverken i Karlskrona AB
Borås Energi AB
Falu Energi och Vatten AB
Fortum Värme samägt med Stockholmsstad AB
Graninge Energi AB
Göteborg Energi AB
Halmstad Energi AB
Jämtkraft AB
Jönköping Energi AB
Kalmar Energi AB
Karlshamn Energi AB
Karlskoga Energi AB
Kungälv Energi AB
Landskrona Energi AB
Lundsenergikoncernen AB
Norrenergi AB
Orust Kommun
Sigtuna Energi AB
Skellefteå kraft AB
Söderenergi AB
Telge Energinät AB
Trollhättan Energi AB
Uddevalla Energi AB
Umeå Energi AB
Varberg Energi AB
Vattenfall AB
Växjö Energi AB
Öresundskraft AB

Other customers :

ABS pumps International AB
Birka Teknik & Miljö AB
Capitol Cooling
Chalmers Univercity of Technology
Falköpings Kommun
Hydroplast AB
Högskolan i Borås
Industriarmatur AB
Midroc Engineering AB
Outotec AB
Port of Gothenburg
Pöyry Sweden AB
Ramböll AB
Ringhals AB
Rintekno AB
Stockholm Vatten AB
Svenskfjärrvärme AB
SWECO Industry AB
SwedPower AB
VA-Ingenjörerna AB
VVS-Kontroll AB

Vi erbjuder konsultation och beräkningar angående hydrauliskt stationära och transienta förlopp i rörsystem.