10-12-2012, 12:55 AM
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If I were doing such a thing, this is what I would do:
-> I would place the bridge so that both ends are fully underwater
-> The I would take some airline hosing, or possibly something a bit thicker, like the hose on a gravel vac, and run it UNDER one end of the bridge, up INTO the air that is captured inside.
---->Another option is to have the hose already attached to the bridge in such a way that when submerged, the end of the hose will be as near the top of the bridge as possible. This method will also allow the bridge to be set into the water more easily, as the air trapped will be pushed out when the water rises in the individual ends.
-> NEXT is the tricky part. VERY CAREFULLY, being super sure to have a thumb ready to cover the end of the tube, I would use my mouth to suck the air out of the bridge. Such as when blowing up a balloon, you would suck out air, create a seal with your mouth, breathe, then repeat the process until all, or nearly all of the air had been removed from the cavity.
---->You can MAYBE use a vacuum to do this, by creating a seal between the nozzle of the vacuum and the end of the tube (a balloon would actually be useful here, if you think about it), but there is a HUGE risk of a) sucking water into your vacuum cleaner, which could be a very bad thing, or b) once you turn off the cleaner, which isn't airtight, unless you are ABSOLUTELY READY, air from your cleaner could be sucked into your bridge, making one heck of a mess. I'd stick to the mouth method, it is much easier to control.
---->To assist removing the air, you, or even better, an assistant, could tilt the bridge so that while both ends are still fully submerged, the air that is trapped moves to the higher end, where you can remove it more efficiently.
-> Once you have removed as much of the air as you can, BEING SURE TO KEEP THE HOSE CLOSED WITH YOUR MOUTH OR YOUR THUMB, remove the other end from your bridge. Empty the hose back into your tank, and Voila, Aquabridge.
That's how I would do it, anyway :3