{"id":31136,"date":"2026-07-23T14:09:37","date_gmt":"2026-07-23T06:09:37","guid":{"rendered":"https:\/\/shchimay.com\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/"},"modified":"2026-07-23T14:09:37","modified_gmt":"2026-07-23T06:09:37","slug":"suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay","status":"publish","type":"post","link":"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/","title":{"rendered":"Suspended Solids Monitoring in API Separator Effluent: A Field Engineer&#8217;s View with Shanghai ChiMay"},"content":{"rendered":"<hr \/>\n<p>title: &ldquo;Suspended Solids Monitoring in API Separator Effluent: A Field Engineer&rsquo;s View with Shanghai ChiMay&rdquo;<br \/>\nperspective: Technical<br \/>\ntheme: Oil &amp; Gas \/ Petrochemical Wastewater<br \/>\ndate: 2026-07-03<\/p>\n<hr \/>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_50 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Suspended_Solids_Monitoring_in_API_Separator_Effluent_A_Field_Engineer%E2%80%99s_View_with_Shanghai_ChiMay\" title=\"Suspended Solids Monitoring in API Separator Effluent: A Field Engineer&rsquo;s View with Shanghai ChiMay\">Suspended Solids Monitoring in API Separator Effluent: A Field Engineer&rsquo;s View with Shanghai ChiMay<\/a><ul class='ez-toc-list-level-2'><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Key_Takeaways\" title=\"Key Takeaways\">Key Takeaways<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Why_API_Separator_Effluent_Is_a_Difficult_Measurement_Target\" title=\"Why API Separator Effluent Is a Difficult Measurement Target\">Why API Separator Effluent Is a Difficult Measurement Target<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Two_Practical_Technologies\" title=\"Two Practical Technologies\">Two Practical Technologies<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Optical_Backscatter_NIR_IR\" title=\"Optical Backscatter (NIR \/ IR)\">Optical Backscatter (NIR \/ IR)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Dual-Beam_Absorption_Beer-Lambert\" title=\"Dual-Beam Absorption (Beer-Lambert)\">Dual-Beam Absorption (Beer-Lambert)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Comparative_Snapshot\" title=\"Comparative Snapshot\">Comparative Snapshot<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Placement_Advice_from_the_Field\" title=\"Placement Advice from the Field\">Placement Advice from the Field<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Downstream_of_the_Weir_Before_the_DAF_Feed_Pump\" title=\"Downstream of the Weir, Before the DAF Feed Pump\">Downstream of the Weir, Before the DAF Feed Pump<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Include_a_Bubble_Trap\" title=\"Include a Bubble Trap\">Include a Bubble Trap<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Avoid_Vertical_Down-Flow_Installations\" title=\"Avoid Vertical Down-Flow Installations\">Avoid Vertical Down-Flow Installations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Provide_Cleaning_Access\" title=\"Provide Cleaning Access\">Provide Cleaning Access<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Shanghai_ChiMay_Instrumentation_for_API_Separator_TSS\" title=\"Shanghai ChiMay Instrumentation for API Separator TSS\">Shanghai ChiMay Instrumentation for API Separator TSS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Diagnostic_Interpretation\" title=\"Diagnostic Interpretation\">Diagnostic Interpretation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Cost_and_Benefit_Frame\" title=\"Cost and Benefit Frame\">Cost and Benefit Frame<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/shchimay.com\/fr\/suspended-solids-monitoring-in-api-separator-effluent-a-field-engineer-s-view-with-shanghai-chimay\/#Outlook\" title=\"Outlook\">Outlook<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 id=\"suspended-solids-monitoring-in-api-separator-effluent-a-field-engineers-view-with-shanghai-chimay\"><span class=\"ez-toc-section\" id=\"Suspended_Solids_Monitoring_in_API_Separator_Effluent_A_Field_Engineer%E2%80%99s_View_with_Shanghai_ChiMay\"><\/span>Suspended Solids Monitoring in API Separator Effluent: A Field Engineer&rsquo;s View with Shanghai ChiMay<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2 id=\"key-takeaways\"><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>API separator effluent carries <strong>20\u2013300 mg\/L total suspended solids (TSS)<\/strong> under normal operation, spiking above <strong>1,000 mg\/L<\/strong> during storm-water events and unit upsets.<\/li>\n<li>Reliable online TSS measurement is the single best early-warning signal for downstream dissolved air flotation (DAF), biological treater, and outfall performance.<\/li>\n<li>Optical backscatter and near-infrared absorption sensors are the field-proven technologies; each has a preferred window and known interferences.<\/li>\n<li>Shanghai ChiMay turbidity testers and SS sensors, paired with the broader Shanghai ChiMay <a href=\"\/tag\/water-quality-analyzer\" target=\"_blank\"><strong>water quality analyzer<\/strong><\/a> family, deliver continuous, hazardous-area-ready TSS visibility at the separator outfall.<\/li>\n<\/ul>\n<h2 id=\"why-api-separator-effluent-is-a-difficult-measurement-target\"><span class=\"ez-toc-section\" id=\"Why_API_Separator_Effluent_Is_a_Difficult_Measurement_Target\"><\/span>Why API Separator Effluent Is a Difficult Measurement Target<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The API separator is the first line of defense in refinery wastewater treatment. It removes free oil by gravity and settles heavy solids into a sludge blanket. What leaves the separator is a variable mixture of emulsified oil, fine suspended solids (iron sulfide fines, coke particles, catalyst dust, silt), and dissolved organics. TSS in that effluent stream is highly informative and highly variable \u2014 which is exactly why field engineers care about it.<\/p>\n<p>Under normal operation, TSS runs <strong>20\u2013150 mg\/L<\/strong>. During a storm-water event or an upstream desalter upset, TSS can spike above <strong>1,000 mg\/L<\/strong> in minutes. Without an online sensor, that spike travels straight into the DAF, the biotreater, and eventually the outfall. Discharge permit limits (<strong>NPDES daily maximums of 30\u2013100 mg\/L TSS<\/strong> are typical for U.S. refineries) leave very little tolerance for un-instrumented excursions.<\/p>\n<h2 id=\"two-practical-technologies\"><span class=\"ez-toc-section\" id=\"Two_Practical_Technologies\"><\/span>Two Practical Technologies<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Field engineers deploy two dominant online TSS technologies.<\/p>\n<h3 id=\"optical-backscatter-nir-ir\"><span class=\"ez-toc-section\" id=\"Optical_Backscatter_NIR_IR\"><\/span>Optical Backscatter (NIR \/ IR)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>An infrared LED illuminates the sample; a photodetector positioned at a defined angle (typically <strong>90\u00b0 or 135\u00b0<\/strong>) measures scattered light. The scattered signal correlates to particle concentration.<\/p>\n<p><strong>Strengths<\/strong><br \/>\n&#8211; Simple, robust, low-cost<br \/>\n&#8211; Wide range from <strong>1 to 4,000 mg\/L<\/strong><br \/>\n&#8211; Tolerant of colored water when using <strong>860 nm<\/strong> infrared wavelengths<br \/>\n&#8211; Self-cleaning versions available with wiper or ultrasonic cleaning<\/p>\n<p><strong>Limits<\/strong><br \/>\n&#8211; Sensitive to particle-size distribution changes<br \/>\n&#8211; Bubbles cause positive bias if not managed<br \/>\n&#8211; Requires clean window; oil film degrades signal<\/p>\n<h3 id=\"dual-beam-absorption-beer-lambert\"><span class=\"ez-toc-section\" id=\"Dual-Beam_Absorption_Beer-Lambert\"><\/span>Dual-Beam Absorption (Beer-Lambert)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Two wavelengths (<strong>typically 660 nm and 860 nm<\/strong>) pass through the sample. Absorption at each is compared to derive TSS while compensating for color and dissolved organics.<\/p>\n<p><strong>Strengths<\/strong><br \/>\n&#8211; Better rejection of dissolved-organic and color interference<br \/>\n&#8211; Well-suited for <strong>high-COD, colored effluent<\/strong> typical of refinery service<br \/>\n&#8211; Wide range possible with optical path adjustment<\/p>\n<p><strong>Limits<\/strong><br \/>\n&#8211; More expensive<br \/>\n&#8211; Still sensitive to bubbles and oil films<br \/>\n&#8211; Calibration model must match the specific solids matrix<\/p>\n<h2 id=\"comparative-snapshot\"><span class=\"ez-toc-section\" id=\"Comparative_Snapshot\"><\/span>Comparative Snapshot<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead>\n<tr>\n<th>Attribute<\/th>\n<th>Optical Backscatter<\/th>\n<th>Dual-Beam Absorption<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Typical range<\/td>\n<td>1\u20134,000 mg\/L<\/td>\n<td>5\u201310,000 mg\/L<\/td>\n<\/tr>\n<tr>\n<td>Color rejection<\/td>\n<td>Moderate<\/td>\n<td>Strong<\/td>\n<\/tr>\n<tr>\n<td>Oil-film sensitivity<\/td>\n<td>Higher<\/td>\n<td>Lower<\/td>\n<\/tr>\n<tr>\n<td>Response time<\/td>\n<td>&lt;5 s<\/td>\n<td>5\u201310 s<\/td>\n<\/tr>\n<tr>\n<td>Calibration frequency<\/td>\n<td>Weekly to monthly<\/td>\n<td>Monthly<\/td>\n<\/tr>\n<tr>\n<td>Best fit<\/td>\n<td>General API separator effluent<\/td>\n<td>High-color, high-COD post-DAF streams<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"placement-advice-from-the-field\"><span class=\"ez-toc-section\" id=\"Placement_Advice_from_the_Field\"><\/span>Placement Advice from the Field<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The right sensor in the wrong location gives bad data. Field engineers converge on the following placement principles.<\/p>\n<h3 id=\"downstream-of-the-weir-before-the-daf-feed-pump\"><span class=\"ez-toc-section\" id=\"Downstream_of_the_Weir_Before_the_DAF_Feed_Pump\"><\/span>Downstream of the Weir, Before the DAF Feed Pump<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This point captures the true separator effluent quality without contamination from downstream chemistry. A <strong>short, slow-flow sample line<\/strong> with automated flushing keeps the sensor representative.<\/p>\n<h3 id=\"include-a-bubble-trap\"><span class=\"ez-toc-section\" id=\"Include_a_Bubble_Trap\"><\/span>Include a Bubble Trap<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bubbles are the number-one false-positive source for optical TSS. A <strong>10-second residence-time bubble trap<\/strong> upstream of the sensor eliminates most of the problem.<\/p>\n<h3 id=\"avoid-vertical-down-flow-installations\"><span class=\"ez-toc-section\" id=\"Avoid_Vertical_Down-Flow_Installations\"><\/span>Avoid Vertical Down-Flow Installations<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Solids can accumulate in vertical down-flow pipe sections and produce falsely low readings between wash cycles. <strong>Horizontal or upflow orientations<\/strong> are preferred.<\/p>\n<h3 id=\"provide-cleaning-access\"><span class=\"ez-toc-section\" id=\"Provide_Cleaning_Access\"><\/span>Provide Cleaning Access<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Any TSS sensor at an API separator will foul. Design for <strong>inspection and manual cleaning every 2\u20134 weeks<\/strong> even with automated wipers.<\/p>\n<h2 id=\"shanghai-chimay-instrumentation-for-api-separator-tss\"><span class=\"ez-toc-section\" id=\"Shanghai_ChiMay_Instrumentation_for_API_Separator_TSS\"><\/span>Shanghai ChiMay Instrumentation for API Separator TSS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Shanghai ChiMay offers both technology families for suspended solids monitoring:<\/p>\n<ul>\n<li><strong>Shanghai ChiMay <a href=\"\/tag\/Turbidity-Tester\" target=\"_blank\"><strong>Turbidity Tester<\/strong><\/a><\/strong> \u2014 860 nm infrared backscatter head with automatic wiper, range 0.001\u20134,000 NTU (correlated to TSS), and hazardous-area-rated transmitter option.<\/li>\n<li><strong>Shanghai ChiMay SS Sensor<\/strong> \u2014 dual-beam near-infrared design for direct TSS reporting in mg\/L, range 0\u201320,000 mg\/L, engineered for high-solids and high-color service.<\/li>\n<li><strong>Shanghai ChiMay 4-in-1 Multi-Parameter Sensor<\/strong> \u2014 complementary pH, ORP, DO, and temperature data that helps interpret TSS trends in context.<\/li>\n<\/ul>\n<p>Because these instruments share the Shanghai ChiMay transmitter platform, refineries can standardize on a single spare-parts inventory and one DCS integration pattern for the entire separator outfall monitoring stack.<\/p>\n<h2 id=\"diagnostic-interpretation\"><span class=\"ez-toc-section\" id=\"Diagnostic_Interpretation\"><\/span>Diagnostic Interpretation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A TSS trend is only useful if the operator can interpret it. Field engineers develop simple diagnostic rules such as:<\/p>\n<ul>\n<li><strong>Slow rise over hours<\/strong>: sludge blanket approaching the weir; investigate sludge draw rate.<\/li>\n<li><strong>Fast spike lasting minutes<\/strong>: upstream desalter upset or brine slug; verify with pH and conductivity trend.<\/li>\n<li><strong>Ratcheting oscillation<\/strong>: bubble trap failure or pump cavitation; inspect sample panel.<\/li>\n<li><strong>Baseline drift upward over weeks<\/strong>: window fouling; schedule cleaning.<\/li>\n<\/ul>\n<p>Pairing TSS with <strong>oil-in-water, pH, and flow<\/strong> data closes the diagnostic loop and turns TSS from a compliance number into an operating insight.<\/p>\n<h2 id=\"cost-and-benefit-frame\"><span class=\"ez-toc-section\" id=\"Cost_and_Benefit_Frame\"><\/span>Cost and Benefit Frame<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Benchmark data from three U.S. Gulf Coast refineries shows that adding continuous TSS monitoring at the API separator outfall reduced downstream biotreater upsets by <strong>28\u201341%<\/strong> and cut per-event corrective chemical spend by roughly <strong>USD 8,000 to USD 22,000<\/strong>. Payback on a <strong>USD 20,000\u201335,000<\/strong> sensor and sample panel installation was typically <strong>6\u201312 months<\/strong>.<\/p>\n<h2 id=\"outlook\"><span class=\"ez-toc-section\" id=\"Outlook\"><\/span>Outlook<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>As refinery discharge limits tighten and produced-water reuse programs expand, API separator effluent monitoring will grow from &ldquo;advisable&rdquo; to &ldquo;expected.&rdquo; Shanghai ChiMay&rsquo;s turbidity testers, SS sensors, and companion water quality analyzers give field engineers a proven, hazardous-area-ready toolkit for a measurement problem whose importance is only increasing. The best operators will be the ones who instrument the separator outfall now, not after the next enforcement action.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>title: &ldquo;Suspended Solids Monitoring in API Separator Effluent: A Field Engineer&rsquo;s View with Shanghai ChiMay&rdquo; perspective: Technical theme: Oil &amp; Gas \/ Petrochemical Wastewater date: 2026-07-03 Suspended Solids Monitoring in API Separator Effluent: A Field Engineer&rsquo;s View with Shanghai ChiMay Key Takeaways API separator effluent carries 20\u2013300 mg\/L total suspended solids (TSS) under normal operation,&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"categories":[1],"tags":[134481,11066,154],"translation":{"provider":"WPGlobus","version":"2.12.0","language":"fr","enabled_languages":["en","es","fr","ru","ar"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false},"ar":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/posts\/31136"}],"collection":[{"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/comments?post=31136"}],"version-history":[{"count":0,"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/posts\/31136\/revisions"}],"wp:attachment":[{"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/media?parent=31136"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/categories?post=31136"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shchimay.com\/fr\/wp-json\/wp\/v2\/tags?post=31136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}