When the exhaust system is cleaned, water fills one of the light fixtures in the exhaust hood. The cause is probably a poor weld during the original installation. The exhaust cleaning was done by another company for several years. When we started to clean the exhaust system, there were heavy grease deposits in the duct. Over time, we were able to remove the grease, getting the duct to bare metal. This removal of the grease exposed the voids in the welds. Water is now getting through the voids and puddling on top of the hood. The water then leaks into the light fixture. The real problem is if water gets on top of the hood, grease is also getting on top of the hood. The fire suppression system is not designed to control a fire outside of the hood. Grease on the hood can lead to another fire, but would be more severe than the previous fire.
Our process to investigate the cause of the leakage will be:
1. Examine the inside of the duct for voids in the welds.
2. Grind excess metal off the welds as needed.
3. If the above process does not reveal voids in the welds, we will put a light inside the duct. We will make holes in the sheet rock above the hood for camera access. This would also allow us to see how much grease is on the top of the hood. If the depth of the grease is more than 50 Microns, we will make access holes so the grease could be removed. If voids are found, a qualified welder will be hired to fill the voids. Welds will be ground smooth and checked for voids with a light, until the voids are filled.
Did I miss anything? Any thing else to look for? Best response gets $5.00 donated in their name to keep this board going. ( I'll just add the $5.00 to the job)
Our process to investigate the cause of the leakage will be:
1. Examine the inside of the duct for voids in the welds.
2. Grind excess metal off the welds as needed.
3. If the above process does not reveal voids in the welds, we will put a light inside the duct. We will make holes in the sheet rock above the hood for camera access. This would also allow us to see how much grease is on the top of the hood. If the depth of the grease is more than 50 Microns, we will make access holes so the grease could be removed. If voids are found, a qualified welder will be hired to fill the voids. Welds will be ground smooth and checked for voids with a light, until the voids are filled.
Did I miss anything? Any thing else to look for? Best response gets $5.00 donated in their name to keep this board going. ( I'll just add the $5.00 to the job)
