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The images below show the settings previously discussed used for the two target_smoke entities; the only difference being one's 'black' the other 'white', the info_notnull targets and 'gravity' set on the lower one - oh wait I changed the upper one to have a short delay so you could see the denser smoke effect.
Although the objects, entities and brushwork have been move further up the wall to make it easier to see the steam jet effect with two jets, it's the same brushwork setup as shown in the previous section of this tutorial discussing the use of just one steam jet..
Brushwork and Item placement
The two target_smoke entities are placed in the same location to give the impression of two streams of steam being emitted from the same location (fracture in the pipe). Both entities use the same settings and set up as previous (shown below).
Entity setup in the "Inspector" for multiple Steam effects

Connecting the target_smokes to the info_nulls
The in game results of this one are interesting and display one of the various 'issues' that seem to happen when trying to use multiple entities in this way (these 'issues' are separate from the ones that happen running under MP where the smoke appears to only go straight up or down), note the angle of the lower smoke, it's much shallower than shown in the in editor setup screen shot above.
note also that although the entities set up in editor is approximately the same the results are very different because of the variation based on distance between the info_notnull target and the shorter 'delay' key/value.
In game shot of the two steam jets
There does appear to be a 'bug' with approach though when trying to have more than one jet running at the same time from the same location. The angle on the lower jet doesn't match what's seen in game (less shallow angle) so there are some limits to what can be done.
It must be noted thought this only appears to apply to entities being active at the same time so it should be possible to have several in the same place in the editor and spawn/hide them according to the events needed without this error.
Displaced Terrain Mesh - using displace to make a basic terrain +optimisation tips
Displace & Simple Terrain - making a simple terrain in Blender 2.49 using displace
Render like SketchUp - image render scenes in Blender like SketchUp
Render Wireframe - settings to render scenes as wireframe images in Blender