JULY, 2017 / NATIONAL CLOTHESLINE / PAGE 35 Remember that useless laser thermometer you bought to test your steam traps to no avail? Hooray! Go get it. We’re going to use it. First a note on obtaining ac- curate measurements using the laser thermometer. 1. The surface of the target should not be a highly reflec- tive color like silver or white or have a highly polished fin- ish like chrome or stainless. If it does, take a black Sharpie marker and blacken an area about the size of a quarter. Use this blackened area as the tar- get spot on the surface to be tested. 2. The laser pointer is nor- mally used to select the target area and illuminates the center of the sensed area. Since the sensor itself measures all of the infrared energy entering the lens, it becomes progressively more accurate the closer you place the sensor to the target area. When using the laser ther- mometer to run these tests, be sure to position the lens of the thermometer slightly above the surface of the area being measured; don’t just aim it and use the laser pointer to take the temperature. With the water column and boiler shell blowdown valves shut, open the globe-type, slow opening master blowdown valve (if one is present it will likely have a round handle un- like the ball valves which have a lever shaped handle) and al- low the boiler to run at least two hours. Then use the laser ther- mometer to obtain the temper- ature of the one-inch black pipe elbow on the floor men- tioned earlier in the article. Next, measure the tempera- ture of the pipe right after the blowdown valve under test. If this reading is more than 30° F. higher than the temperature of the elbow on the boiler room floor, the valve is likely leaking some very expensive super- heated water. Keep in mind that there is a blowdown valve for both the water column and the boiler pressure vessel (shell) and a leak in one will interact with measurements taken on either valve. That’s no big deal because once you determine there is a leak, the temperature of the piping closest to the leak will be higher, so just trace back looking for the point of highest temperature and the valve closest to that location will be the one that’s faulty. After having checked the ball valves, if they’re OK, close the slow opening master blow- down valve and crack (slightly open) the column blowdown valve. Wait about a half hour and run the test on the master blowdown valve. If this valve leaks but the other two are OK, you can get away with post- poning a repair for a while. Don’t forget to shut whatever valves were opened during testing. A note on boiler valves Valves used on boilers should be rated at next higher level of the maximum rated boiler operating pressure. For example, if the rated op- erating pressure (usually found on the name plate at- tached to the boiler) is 150 PSI, then the valve would be steam rated for at least 200 PSI. This rating usually appears on the body of the valve after the SWP abbreviation for “steam working pressure” (you won’t find these valves at Home De- pot or Lowe’s). The numbers following the ab- breviation WOG stands for the pressure rated for use with wa- ter-oil-gas and is not the rating for steam service. In order to comply with code, piping and fittings between the boiler and blowdown tank must be Schedule 80. Well that’s about it for this issue. We will be searching for more easy find and repair, dol- lar-wasting conditions in next month’s issue. Bruce Grossman is the chief of R&D for EZtimers Manufactur- ing, maker of the EZ Level return tank water level control which replaces the troublesome ball float valve in the return tank. The Sahara and Drop in the Bucket line of high purity separator water mister/evaporators and the Tattler steam trap tester, an accurate and easy to use device, are also part of the EZtimer product line. For more informa- tion, visit www.eztimers.com. Address any questions or com- ments to bruce@eztimers.com or call (702) 376-6693. Continued from page 34 Bruce Grossman Stop energy-wasting steam loss Brent Padon: 561-644-5517 email: bpadon@renzacci-usa.com - info@renzacci-usa.com Dry Cleaning Machines IS ALL YOU NEED EXCELLENCE 2.0 Huge range of machines hard & soft mounted with still and/or filtration unit from 20 up to 90 Lb. Washer Extractors Tumbling Dryers High Spin Soft Mounted, Extra & Regular Spin Hard Mounted from 20 up to 264 Lb. 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