Tag:pipeline=surge_tank
 pipeline =
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| Description |
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A tank designed to absorb water hammer power in a pipeline on valve closing or emergency stops. 
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| Group: pipelines |
| Used on these elements |
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| Useful combination |
Status: approved.svg.png){kind=icon}
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| Tools for this tag |
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A surge tank absorbs the excessive water hammer power in a pipeline or flooded tunnel on valve closings or emergency stops.
Depending on the volume of the upstream pipeline such a tanks can be huge shafts like 200 m of depth and 20 m of diameter - often found in the middle of nowhere. A surge tank may also be called surge drum or surge pool.
How to map
As strategic part of a pipeline system, we map them as nodes with pipeline= on the waterway where their function is, like pipeline=valve.
Despite such tanks can be huge shafts or chimneys, pipeline= should be used on a pipeline node located at the tank's connection to the pipeline or flooded tunnel.
If overground buildings exist they may be mapped with building=service.
Also consider drawing an area for the exact footprint of man_made=chimney or man_made=shaft depending on the actual structure of the tank.
Tagging
| Key | Value | Comment | Recommendation |
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pipeline |
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Point of the pipeline way connected to the surge tank | mandatory |
location |
<tank location> | Location of the surge tank. Can be outdoor, underground | recommended |
diameter |
<tank diameter> | The internal diameter of the tank | optional |
height |
<tank height> | The internal height of the tank, from the pipeline axis to the very top | optional |
ele |
<tank bottom elevation> | The bottom elevation of the tank | optional |
capacity |
<tank capacity> m3 | The capacity of the tank, if applicable | optional |
operator |
<surge tank operator> | Name of the company operating the surge tank | optional |
Examples
| Photo | Aerial view | Tagging | Note |
|---|---|---|---|
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At the center of the shaft or chimney, add a node and use :
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A chimney is installed above the pipeline it is supposed to protect |
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At the center of the shaft, add a node and use :
On the shaft actual footprint, an area:
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Here is an underground shaft acting as a surge tank for a penstock located 170 metres below. The shaft outlet is about 18 metres wide |