Tank Testing Nightmares MA скачать в хорошем качестве

Tank Testing Nightmares MA

http://www.commtank.com/tank-articles... This video chronicles tank testing jobs that are difficult to work on. The images in this video are examples of maintenance or installation issues which make tank tightness testing difficult or require further modifications to the underground storage tank (UST). Water in UST sumps is the number one issue a tank tester encounters when working on tanks. Tightness testing of UST sumps is required by law in Massachusetts and New Hampshire. A sealed sump will not allow water to enter and minimizes corrosion that occurs on fuel and return lines, test points, sensor wiring and vent pipes. Having to remove water from the sump delays the start of the test and creates hazardous waste that must be disposed of properly. Interstitial manways allow access to the secondary containment of double-wall tanks. In order to test the interstitial space, the cap that covers the access pipe must be removed, and the pipe must be sealed and pressurized to no more than 1 PSI. If the manway is filled with soil, it must be cleaned and any rust removed from the access pipe. These extra steps will slow down or halt the test if the pipe has been badly damaged by corrosion. Vent pipes that are mounted beyond the reach of a standard 24 foot ladder but are not accessible from the building roof create a problem for tank tightness testing. If the vent pipe cannot be plugged from the pipe end then a ladder lift or boom truck must be brought to the site. Regulations do not allow shutoff valves on vent lines due to the danger of pressure build up in the tank and tank installers rarely place a union at the flange where the vent line comes off the tank. Corroded fuel lines usually are difficult to open in the limited space available of a UST sump. Large wrenches don’t have enough swing room to be effective. Keeping the sump dry and the lines free of corrosion will allow testing to go smoothly. Monitoring wells are required for testing because knowing the ground water level will dictate the pressure of the tightness test. You have to overcome the exterior water pressure if you’re going to find a leak in a tank submerged in water. An improperly marked or installed well can cause accuracy issues and affect the test outcome adversely. Corrosion in the fill pipe will prevent test plugs from seating properly and allow air to pass by the plug. Angled fill pipes prevent a sonde or microphone from being placed at the top of the tank. If a microphone is placed high in a fill pipe it limits the sounds that can be picked up from the ends of the tank. Sealing compound placed on UST piping threads will dry out over time. Dry compound becomes flakey and loose which reduces the effectiveness of the seal. Vent pipes that are exposed to sun and wind should have their seals checked annually to make sure they are holding up. Tank vents that are terminated in a wall do not allow for access to the pipe for plugging. If the UST does not have a manway over the buried vent line then the only option for testing is to break up the wall. USTs that are designed and installed with tank tightness testing in mind make for easy testing and accurate test results. For more information about our tank tightness testing services, call CommTank at 1-800-628-8260. Or you can reach us by email at sales@commtank.com. CommTank, Inc. 84 New Salem Street Wakefield, Ma. 01880 www.commtank.com Hit the Streets (Version 1) by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...) Artist: http://incompetech.com/