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Antennas, Elevated Water Tanks, and Stud Welding
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Source：Internet Author：Unknow Pubdate：2008-10-27
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sewerratt (Civil/Environme)
20 Oct 08 14:00
Anyone have any experience with the use of nelson stud welding to attach antenna mounts to elevated water storage tanks? The structural part is OK, but I'm trying to determine the extent of damage, if any, to expect on the interior coating of the tank. The proposed studs are 3/8" dia and the tank plate is 1/4" thick. Nelson says everything is fine and don't worry, but they'll be gone in a year and I'll still have a tank to maintain. Anybody have any problems with interior coating burn when a antenna was put on your tank?
sbush (Civil/Environme)
20 Oct 08 17:47
It's definitely going to "brown" the interior coating in that spot. Will that compromise the coating? I wouldn't want to find out by trial and error.
The first time one of our welders forgot to install an exterior bracket for a tank name plate, I decided to have him affix the bracket with four low-heat tacks. The results: brown spots on the interior surfaces adjacent to the tacks. The tank was empty, at the time, so we were able to repair the coating. Now, if we forget to attach a name plate bracket and the vessel has already been coated, we use a high-strength epoxy (something like J-B Weld) to essentially glue it in place. 字串1
I would look for some other appendage (hand rail, ladder, leg, pipe flange, etc.), on or near the tank, that will allow for a good penetration weld.
Good luck! S. Bush
www.water-eg.com
greggy (Civil/Environme)
21 Oct 08 16:00
Have you considered magnetically mounted antennas? Check it out at http://www.metal-cable.com/, a product called "magnemount", which will prevent the need for welding and blistering the coating system on the interior of the tank.
gerhardl (Mechanical)
27 Oct 08 11:58
If you look to (European) magnetic powder applied epoxy coating of valves allowed for drinking water, some of the best coatings will have a coating manufacturor limit of 70deg C for fluids and 120 deg C for dry air, but also a limitation of 70 deg centigrade difference between outer and inner wall. 字串9
Reason and by experience: at around or above 100 - 110 deg Centigrade for fluids the coating will not keep colour and small bubbels inside coating or slips against wall may occur. This is then a start-point for corrosion.
General conclusion: if by welding the coating producers max temperature for any quality or methode of coating is exceeded, the producers guarantee for the coating will not be valid. The coating will be weakened, and corrosion or damage of tank walls may start at the weakened point.
Mis-coloring is a sign that the max temp. have been exceeded.
From insurance and quality point of view your action should be obvious.
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