{"id":3155,"date":"2022-05-26T14:19:46","date_gmt":"2022-05-26T06:19:46","guid":{"rendered":"https:\/\/www.hginstrument.com\/?p=3155"},"modified":"2022-05-26T14:19:46","modified_gmt":"2022-05-26T06:19:46","slug":"common-faults-and-treatment-of-differential-pressure-flow-meter","status":"publish","type":"post","link":"https:\/\/www.hginstrument.com\/it\/common-faults-and-treatment-of-differential-pressure-flow-meter\/","title":{"rendered":"Guasti comuni e trattamento del misuratore di portata a pressione differenziale"},"content":{"rendered":"<table width=\"1126\">\n<tbody>\n<tr style=\"background-color: #d8d8d8;\">\n<td style=\"text-align: center;\" width=\"233\">Fenomeno di guasto<\/td>\n<td style=\"text-align: center;\" width=\"479\">Motivo<\/td>\n<td style=\"text-align: center;\" width=\"414\">Misure di trattamento<\/td>\n<\/tr>\n<tr>\n<td style=\"vertical-align: middle;\" width=\"233\">Indicates zero or very small movement<\/td>\n<td width=\"479\">1. Balance valve is not fully closed or leaking.<br \/>\n2.The stop valve of high pressure side and low pressure side at the root of the throttle device is not opened.<br \/>\n3.The valve and pipeline between throttling device and differential pressure gauge are blocked.<br \/>\n4.The steam tube is not fully condensed.<br \/>\n5.The gasket between throttling device and process piping is not pressed tightly.<br \/>\n6.The differential pressure gauge is faulty.<\/td>\n<td width=\"414\">1. Close balance valve and repair or replace.<br \/>\n2. Open the stop valve of the high pressure side and low pressure side.<br \/>\n3. Flush the pipeline and repair or replace the valve.<br \/>\n4. Open the meter after complete condensation.<br \/>\n5. Tighten bolts or replace pads.<br \/>\n6. Check and repair.<\/td>\n<\/tr>\n<tr>\n<td style=\"vertical-align: middle;\" width=\"233\">Indicating below zero<\/td>\n<td width=\"479\">1. The pipelines at high pressure side and low pressure side\u00a0 are reverse connected.<br \/>\n2. The signal line is connected reversely.<br \/>\n3. Pipe on the high-pressure side has a serious leak or crack.<\/td>\n<td width=\"414\">1-2. Connect correctly.<br \/>\n3. Replace the part or the pipe.<\/td>\n<\/tr>\n<tr>\n<td style=\"vertical-align: middle;\" width=\"233\">Indicating is lower than the standard value<\/td>\n<td width=\"479\">1. Pipe on the high-pressure side is not tight.<br \/>\n2. Balance valve is loose or not closed.<br \/>\n3. Air accumulates in the high-pressure side pipe.<br \/>\n4. Zero point of Differential pressure gauge or secondary instrument misalign or displace.<br \/>\n5. Throttling device and differential pressure gauge are not matched.<\/td>\n<td width=\"414\">1. Check and eliminate the leakage.<br \/>\n2. Inspect, close or repair.<br \/>\n3. Exhaust the air completely.<br \/>\n4. Check and adjust.<br \/>\n5. Replace the differential pressure gauge.<\/td>\n<\/tr>\n<tr>\n<td style=\"vertical-align: middle;\" width=\"233\">Indicating is higher than the standard value<\/td>\n<td width=\"479\">1. Pipe on the low-pressure side is not tight.<br \/>\n2. Air accumulates in the low-pressure side pipe.<br \/>\n3. The vapor pressure is below the design value.<br \/>\n4. Zero point of Differential pressure gauge drifts.<br \/>\n5.Throttling device and differential pressure gauge are not matched.<\/td>\n<td width=\"414\">1. Check and eliminate the leakage.<br \/>\n2. Exhaust the air completely.<br \/>\n3. Supplement the vapor pressure according to the actual density.<br \/>\n4. Check and adjust.<br \/>\n5. Replace the differential pressure gauge.<\/td>\n<\/tr>\n<tr>\n<td style=\"vertical-align: middle;\" width=\"233\">Indicating have large fluctuation<\/td>\n<td width=\"479\">1. The flow parameters themselves fluctuates too much.<br \/>\n2. Pressure measuring cells are sensitive to parameter fluctuation.<\/td>\n<td width=\"414\">1. Adjust the valve opening of the high pressure side and the low pressure side appropriately.<br \/>\n2. Adjust the damping effect appropriately.<\/td>\n<\/tr>\n<tr>\n<td style=\"vertical-align: middle;\" width=\"233\">Indicating does not move<\/td>\n<td width=\"479\">1. Antifreeze facilities fail, hydraulic of Differential pressure gauge and pressure tube freezes.<br \/>\n2. Valves of the high pressure side and the low pressure side are not opened.<\/td>\n<td width=\"414\">1. Strengthen the effect of anti-freezing facilities.<br \/>\n2. Open the valves of the high pressure side and the low pressure side<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"<p>Guasti comuni e trattamento del misuratore di portata a pressione differenziale<\/p>","protected":false},"author":1,"featured_media":2768,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[2130],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/posts\/3155"}],"collection":[{"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/comments?post=3155"}],"version-history":[{"count":0,"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/posts\/3155\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/media\/2768"}],"wp:attachment":[{"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/media?parent=3155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/categories?post=3155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hginstrument.com\/it\/wp-json\/wp\/v2\/tags?post=3155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}