Unless it is 100% air tight, the pipe will breathe a little bit and pull humid air in which condenses. It's almost impossible to make a pipe with a cable pass through 100% sealed.If the pipe ends are sealed, how does new moist air get in to condense?
Temperature and humidity changes along with changes in atmospheric pressure all work to create condensation. I had a four inch PVC pipe loaded with many cables. It ran slightly downhill to the tower and then about three feet up to a 180 degree bend at the top to keep water out. One day I noticed the ground was damp at the tower base despite it being midsummer. The PVC pipe had filled with water was was slowly dripping out. I drilled a very small hole at the base and drained the water out. The water was crystal clear proving it was not just ground water infiltration. It is basically impossible to seal a pipe with cables in it tight enough to never cause an issue. One guy I knew even ran a small fan on one end to create airflow thinking he would not have a problem. He was wrong and it filled with water anyway. The Cushcraft 13B2 antenna has a sealed box at the feedpoint. Almost every one of them had problems with water. those that drilled a small weeping hole before installing it had no problems.If the pipe ends are sealed, how does new moist air get in to condense?
Incoming Region Produces X3 Solar Flare |
May 15, 2024 @ 14:55 UTC |
Another major solar flare, but this time from an active region just beginning to turn into view off the east limb. It is possible that the group responsible is old AR 3654 from the previous rotation. The latest flare, an X2.99 event just peaked at 14:38 UTC (May 15). Stay tuned |