Help! We have water in junction box on control loop 7.
Dry Junction Box
Flooded Junction Box
Water in junction box…how many times have you seen this in your plant? Where does the water come from? Here are some possible causes…and an easy way to find out if you have hidden problems in YOUR junction boxes.
Over time heating and cooling of conduits can cause expansion and contraction of joints causing gaps where liquids can get in. Seals, gaskets and O-rings can deteriorate over time, especially when they are dried out or attacked by process chemicals or fumes.
Condensation in conduits
Warm air is capable of holding more moisture than cold air. When air is trapped in a warm conduit, and the conduit is cooled, some of the moisture will deposit as water drops on the walls of the conduit. As the process is repeated more drops form and eventually flow along the conduit and into a junction box.
Conduits that are exposed to the sun, running next to a hot process, or are exposed to freezing temperatures are especially susceptible to condensation.
Inspections to look for water in junction box
In some facilities, junction boxes are inspected on a regular basis to check for moisture and corrosion. While this is considered preventative maintenance each time the junction box is opened there is a chance of introducing moisture or contaminants and taking the risk of striping screws, cross threading covers, or tearing gaskets. Loose covers can also cause problems down the road.
Whether caused by accidents or Mother Nature there are times that process areas get flooded. Prolonged exposure to standing water or process chemicals will seep through small holes or cracks. This is a major reason to check for water in junction box.
As replacement or additional wires are pulled through a conduit plumbers putty and seals can get displaced or damaged.
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