Abstract
The purpose was to measure the oxygen content of water in a district heating system including both plastic (64% of total grid, not including service pipes) and steel pipes taking seasonal and daily variations in temperature into account. The chemical water treatment was stopped before the measurements took place. The oxygen concentration did not exceed 10-20 {mu} g/l. Measurements were taken at the outflow from the power station, where the main pipe feeds the plastic pipes, at the consumer position furthest from the power station and where the main pipe feeds into steel pipes and returns to the power station. Whilst measurements of oxygen content during the winter period were stable, the results of measurements taken in July showed considerable variations in oxygen levels, from <10 {mu}g/l to >100 {mu} g/l, as the steam cushion over the accumulating tank which prevents oxygen reaching the district heating water in the tank was not stable. Measurements were taken in the autumn on diameter 50 mm PEX pipes, steel pipes, plate radiators, unit and steel fittings. The oxygen level is a sign of balance in the system. The balance of oxygen is only an indirect sign of corrosion-related conditions, measurements showed that corrosion
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Oestergaard, L;
[1]
Larsen, J;
[2]
Amby, L
[3]
- Dansk Energi Management A/S, Viby J (Denmark)
- Loegstoer Roer (Denmark)
- Dansk Teknologisk Institut (Denmark)
Citation Formats
Oestergaard, L, Larsen, J, and Amby, L.
Oxygen occurrence in total district-heating systems with a large number of plastic district heating pipes; Iltforekomster i komplette fjernvarmesystemer med store maengder plastfjernvarmeroer.
Denmark: N. p.,
1993.
Web.
Oestergaard, L, Larsen, J, & Amby, L.
Oxygen occurrence in total district-heating systems with a large number of plastic district heating pipes; Iltforekomster i komplette fjernvarmesystemer med store maengder plastfjernvarmeroer.
Denmark.
Oestergaard, L, Larsen, J, and Amby, L.
1993.
"Oxygen occurrence in total district-heating systems with a large number of plastic district heating pipes; Iltforekomster i komplette fjernvarmesystemer med store maengder plastfjernvarmeroer."
Denmark.
@misc{etde_10156975,
title = {Oxygen occurrence in total district-heating systems with a large number of plastic district heating pipes; Iltforekomster i komplette fjernvarmesystemer med store maengder plastfjernvarmeroer}
author = {Oestergaard, L, Larsen, J, and Amby, L}
abstractNote = {The purpose was to measure the oxygen content of water in a district heating system including both plastic (64% of total grid, not including service pipes) and steel pipes taking seasonal and daily variations in temperature into account. The chemical water treatment was stopped before the measurements took place. The oxygen concentration did not exceed 10-20 {mu} g/l. Measurements were taken at the outflow from the power station, where the main pipe feeds the plastic pipes, at the consumer position furthest from the power station and where the main pipe feeds into steel pipes and returns to the power station. Whilst measurements of oxygen content during the winter period were stable, the results of measurements taken in July showed considerable variations in oxygen levels, from <10 {mu}g/l to >100 {mu} g/l, as the steam cushion over the accumulating tank which prevents oxygen reaching the district heating water in the tank was not stable. Measurements were taken in the autumn on diameter 50 mm PEX pipes, steel pipes, plate radiators, unit and steel fittings. The oxygen level is a sign of balance in the system. The balance of oxygen is only an indirect sign of corrosion-related conditions, measurements showed that corrosion is also dependent on the flow of water and the temperature. It was shown that the oxygen content in the system resulting from plastic pipes is low. The level was about 0.25 {mu}g/l, approximately one third of the lowest measured value. It is concluded that there should be no problems with oxygen diffusion through a PEX plastic pipe with an EVAL barrier. (AB).}
place = {Denmark}
year = {1993}
month = {Mar}
}
title = {Oxygen occurrence in total district-heating systems with a large number of plastic district heating pipes; Iltforekomster i komplette fjernvarmesystemer med store maengder plastfjernvarmeroer}
author = {Oestergaard, L, Larsen, J, and Amby, L}
abstractNote = {The purpose was to measure the oxygen content of water in a district heating system including both plastic (64% of total grid, not including service pipes) and steel pipes taking seasonal and daily variations in temperature into account. The chemical water treatment was stopped before the measurements took place. The oxygen concentration did not exceed 10-20 {mu} g/l. Measurements were taken at the outflow from the power station, where the main pipe feeds the plastic pipes, at the consumer position furthest from the power station and where the main pipe feeds into steel pipes and returns to the power station. Whilst measurements of oxygen content during the winter period were stable, the results of measurements taken in July showed considerable variations in oxygen levels, from <10 {mu}g/l to >100 {mu} g/l, as the steam cushion over the accumulating tank which prevents oxygen reaching the district heating water in the tank was not stable. Measurements were taken in the autumn on diameter 50 mm PEX pipes, steel pipes, plate radiators, unit and steel fittings. The oxygen level is a sign of balance in the system. The balance of oxygen is only an indirect sign of corrosion-related conditions, measurements showed that corrosion is also dependent on the flow of water and the temperature. It was shown that the oxygen content in the system resulting from plastic pipes is low. The level was about 0.25 {mu}g/l, approximately one third of the lowest measured value. It is concluded that there should be no problems with oxygen diffusion through a PEX plastic pipe with an EVAL barrier. (AB).}
place = {Denmark}
year = {1993}
month = {Mar}
}