{"id":7922,"date":"2026-09-01T08:26:08","date_gmt":"2026-09-01T08:26:08","guid":{"rendered":"https:\/\/dwi.dk\/?page_id=7922"},"modified":"2026-09-01T08:32:19","modified_gmt":"2026-09-01T08:32:19","slug":"laekagesporing-paa-bornholm","status":"publish","type":"page","link":"https:\/\/dwi.dk\/en\/laekagesporing-paa-bornholm\/","title":{"rendered":"Leak detection on Bornholm"},"content":{"rendered":"
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Leak detection on Bornholm<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The rock carries the sound further than the distance suggests<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The bedrock lies close below the surface in large places on Bornholm, and the pipes are laid where there is space: in natural crevices or in thin layers of soil on top of solid rock. This gives a sound image that does not behave like in sandy soil.<\/p>

Solid rock conducts sound far and with little attenuation. A strong signal in a valve well can therefore originate from a leak a good distance from the point where you are standing, and an operator who does not know the subsurface will end up pointing incorrectly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What bedrock means for leak detection on Bornholm<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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We don't let one listening point decide the matter. The signal is measured at two points, and the position is calculated from the time difference between them, so the distance is based on a calculation rather than an assessment of how loud it sounds. The method is strongest on long, straight stretches, and there are some of these between the towns on the island.<\/p>

The rock also affects the water. If water flows into a crevice, it moves along the rock until the crevice gives access to the surface, and the moisture therefore appears in a completely different place than the hole. A wet spot on the side of the road is an even worse indicator on Bornholm than in sandy soil.<\/p>

If the sound image is still ambiguous, we switch to tracer gas. Harmless gas is injected into the pipe, and the surface is scanned afterwards. The gas comes from only one place, and the acoustics of the rock therefore play no role in the result, which lands with an accuracy of a few centimeters.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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July puts more pressure on the network than February<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Summer consumption on Bornholm is far higher than winter consumption, and this changes what a leak means. A loss that is tolerable in February can cost pressure at the ends of the network, where the summer homes and campsites are located, during the peak season.<\/p>

The season also hides the loss in the statistics. When the water pumped out increases sharply from May, a constant loss disappears into an increase that everyone expects, and a waterworks may end up explaining the entire difference with the guests. Only when autumn sets in and consumption does not fall back completely, the loss becomes visible again.<\/p>

This speaks in favor of measuring outside the season, when consumption is low and the nighttime noise picture is quiet. But it also speaks in favor of having data loggers<\/a> sitting in the net over the summer, where they listen around the clock, and where HydrantAI<\/a> automatically alerts if consumption patterns change faster than the season can explain.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Leak search on Bornholm planned from the back<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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An operator who is going by ferry or plane will not just leave again tomorrow. That is why we put the task in reverse: first we agree on what needs to be measured when the visit is over, and then how many days it will take.<\/p>

It also changes what needs to be taken with you. The equipment for acoustic measurement and for tracer gas comes on the same trip, so the change of method can be done on site instead of having to pay for a new trip. If there is a suspicion that the map material is not suitable, we plan wire search<\/a> into the same visit.<\/p>

Before the trip, we review the map material and measurement setup with you, so that it is known in advance which wells and valves can be opened, and who has the key. The search is carried out from the surface and from the network's existing measurement points, so there is no need to block off or dig along the way, and a review can therefore be scheduled in the middle of an operating week. This is also why several water utilities can advantageously coordinate a joint visit \u2014 the drive between two small networks on the island is short, and the days are spent on measurement instead of transport.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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When the equipment must stay on the island<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Some networks need a review once a year. Others need to be able to screen themselves between visits, especially when the distance to the mainland makes each call a planned action. Search equipment can be purchased or leased from us with service by agreement, and that makes a difference here: if an instrument stops, it will have to be taken by ferry to the mainland before anyone can measure again. We are an authorized distributor of, among other things Gutermann<\/a>.<\/p>

If your own operator is to be able to use it sensibly, he can take a basic course in wiring and leak detection<\/a> at DWI Leak Academy in H\u00f8rsholm, where the theory is followed by exercises on a test track. Then the first assessment is made locally, and we are called in for what requires more.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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