{"id":4446,"date":"2023-09-04T06:47:25","date_gmt":"2023-09-04T06:47:25","guid":{"rendered":"https:\/\/volleyballvnl.com\/?p=4446"},"modified":"2023-09-04T06:47:25","modified_gmt":"2023-09-04T06:47:25","slug":"fischer-know-your-valves-limitations","status":"publish","type":"post","link":"https:\/\/volleyballvnl.com\/?p=4446","title":{"rendered":"Fischer: Know your valve\u2019s limitations\u00a0"},"content":{"rendered":"\n<p>Robert L. Fischer, P.E., is a physicist and electrical engineer who spent 25 years in chemical plants and refineries. Fischer can be a part-time college professor. He is the principal reliability advisor for Fischer Technical Services. He may be reached at bobfischer@fischertechnical.com.<br\/>One of Dirty Harry\u2019s famous quotes was: \u201cA man\u2019s obtained to know his limitations.\u201d This story illustrates why you want to know your management valve\u2019s limitations.<br\/>A client lately known as for help downsizing burners on a thermal oxidizer. Changes in the manufacturing course of had resulted in too much warmth from the existing burners. All attempts to lower temperatures had led to unstable flames, flameouts and shutdowns. The higher temperatures didn\u2019t hurt the product however the burners have been guzzling 110 gallons of propane every hour. Given the high cost of propane at that plant, there were, literally, tens of millions of incentives to preserve energy and reduce costs.<br\/>Figure 1. Operation of a cross linked air\/gas ratio regulator supplying a nozzle combine burner system. The North American Combustion Practical Pointers e-book may be discovered online at https:\/\/online.flippingbook.com\/view\/852569. Fives North American Combustion, Inc. 4455 East 71st Street, Cleveland, OH 44015. Image courtesy of Fives North American Combustion, Inc.<br\/>A capital challenge to retrofit smaller burners was being written. One of the plant\u2019s engineers called for a price estimate to change burner controls. As we mentioned their efforts to reduce gasoline usage, we realized smaller burners might not be required to unravel the problem.<br\/>Oxidizer temperature is mainly determined by the position of a \u201ccombustion air\u201d management valve. Figure 1 reveals how opening that valve will increase strain in the combustion air piping. Higher pressure forces extra air via the burners. An \u201cimpulse line\u201d transmits the air strain to 1 side of a diaphragm within the \u201cgas control valve\u201d actuator. As air pressure on the diaphragm will increase, the diaphragm moves to open the valve.<br\/>The gas valve is mechanically \u201cslaved\u201d to the combustion air being provided to the burner. Diaphragm spring pressure is adjusted to ship the 10-to-1 air-to-gas ratio required for stable flame.<br\/>The plant was unable to keep up flame stability at significantly decrease gasoline flows as a outcome of there&#8217;s a limited vary over which any given diaphragm spring actuator can provide accurate management of valve place. This usable management range is named the \u201cturndown ratio\u201d of the valve.<br\/>In this case, the plant operators not needed to totally open the fuel valve. They needed finer decision of valve place with much decrease combustion air flows. The diaphragm actuator wanted to have the ability to crack open and then control the valve using significantly lower pressures being delivered by the impulse line. Fortunately, changing the spring was all that was required to allow recalibration of the fuel valve actuator \u2014 utilizing the existing burners.<br\/>Dirty Harry would undoubtedly approve of this cost-effective change to the valve\u2019s low-flow \u201climitations.\u201d No capital project.  <a href=\"http:\/\/gaugethai.com\">\u0e08\u0e33\u0e2b\u0e19\u0e48\u0e32\u0e22\u0e40\u0e01\u0e08\u0e27\u0e31\u0e14\u0e41\u0e23\u0e07\u0e14\u0e31\u0e19<\/a> . No important downtime. Only a few inexpensive components and minor rewiring had been required to save \u201ca fistful of dollars.\u201d<br\/>Share<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Robert L. Fischer, P.E., is a physicist and electrical engineer who spent 25 years in chemical plants and refineries. Fischer can be a part-time college professor. He is the principal reliability advisor for Fischer Technical Services. He may be reached at bobfischer@fischertechnical.com.One of Dirty Harry\u2019s famous quotes was: \u201cA man\u2019s obtained to know his limitations.\u201d [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4446","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/4446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4446"}],"version-history":[{"count":1,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/4446\/revisions"}],"predecessor-version":[{"id":4447,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/4446\/revisions\/4447"}],"wp:attachment":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}