{"id":31204,"date":"2026-08-04T20:09:42","date_gmt":"2026-08-04T12:09:42","guid":{"rendered":"https:\/\/www.chimaytech.net\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/"},"modified":"2026-08-04T20:09:42","modified_gmt":"2026-08-04T12:09:42","slug":"oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume","status":"publish","type":"post","link":"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/","title":{"rendered":"Oil-in-Water Trending on Bilge and Slop-Water Reception Streams: A Shanghai ChiMay Instrument Brief"},"content":{"rendered":"<hr \/>\n<p>title: &ldquo;Oil-in-Water Trending on Bilge and Slop-Water Reception Streams: A Shanghai ChiMay Instrument Brief&rdquo;<br \/>\ndate: 2026-07-12<br \/>\nperspective: Technical Deep-Dive<br \/>\ntheme: Marine, Ballast Water &amp; Port Wastewater<\/p>\n<hr \/>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 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\" style=\"cursor:inherit\">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:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Oil-in-Water_Trending_on_Bilge_and_Slop-Water_Reception_Streams_A_Shanghai_ChiMay_Instrument_Brief\" >Oil-in-Water Trending on Bilge and Slop-Water Reception Streams: A Shanghai ChiMay Instrument Brief<\/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:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#The_Short_Version\" >The Short Version<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Why_Bilge_and_Slop_Reception_Is_a_Special_Case\" >Why Bilge and Slop Reception Is a Special Case<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Sensor_Technology_Trade-Offs\" >Sensor Technology Trade-Offs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Sample_Handling_Design\" >Sample Handling Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Correlating_OIW_With_Other_Reception_Facility_Signals\" >Correlating OIW With Other Reception Facility Signals<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Calibration_Strategy_That_Actually_Works\" >Calibration Strategy That Actually Works<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Alarm_Strategy_and_Discharge_Control\" >Alarm Strategy and Discharge Control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.chimaytech.net\/ru\/oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrume\/#Closing_Note\" >Closing Note<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 id=\"oil-in-water-trending-on-bilge-and-slop-water-reception-streams-a-shanghai-chimay-instrument-brief\"><span class=\"ez-toc-section\" id=\"Oil-in-Water_Trending_on_Bilge_and_Slop-Water_Reception_Streams_A_Shanghai_ChiMay_Instrument_Brief\"><\/span>Oil-in-Water Trending on Bilge and Slop-Water Reception Streams: A Shanghai ChiMay Instrument Brief<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2 id=\"the-short-version\"><span class=\"ez-toc-section\" id=\"The_Short_Version\"><\/span>The Short Version<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>MARPOL Annex I restricts overboard discharge of oily bilge water to below 15 ppm oil-in-water (OIW), and port reception facilities receive the heavier fractions that cannot be discharged at sea.<\/li>\n<li>Continuous OIW measurement across a reception facility separates emulsified oil (typically 5\u2013500 ppm) from free oil layers (thousands of ppm at the API separator surface).<\/li>\n<li>Fluorescence-based OIW sensors deliver the fastest response and best sensitivity for aromatic hydrocarbons; scatter-based sensors are more forgiving on heavy fuel oils and older bilge mixtures.<\/li>\n<li>Shanghai ChiMay&rsquo;s oil-in-water sensor is engineered for the sludge, particulate, and emulsion loads typical of bilge and slop-water reception lines, with automatic optical cleaning and dual-wavelength optics.<\/li>\n<\/ul>\n<h2 id=\"why-bilge-and-slop-reception-is-a-special-case\"><span class=\"ez-toc-section\" id=\"Why_Bilge_and_Slop_Reception_Is_a_Special_Case\"><\/span>Why Bilge and Slop Reception Is a Special Case<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A vessel&rsquo;s oily water separator (OWS) is designed to drop overboard discharge below 15 ppm, but real operations produce a broader spread of qualities. Sludge tanks, slop tanks, and bilge holding tanks accumulate the mixtures that the OWS cannot fully process \u2014 emulsified oils, cleaning solvents, engine coolant, and heavy fuel residues. These streams are transferred to a port reception facility for further treatment.<\/p>\n<p>The chemistry inside a reception facility differs fundamentally from a refinery API separator. Cruise-ship greywater, container-ship bilge, and tanker slop each carry a different oil signature, particle size distribution, and detergent load. A single reception facility may see a 100:1 range of oil concentrations during a busy 24-hour shift, and the sensor stack must resolve that entire range without saturating.<\/p>\n<h2 id=\"sensor-technology-trade-offs\"><span class=\"ez-toc-section\" id=\"Sensor_Technology_Trade-Offs\"><\/span>Sensor Technology Trade-Offs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Three sensor technologies dominate industrial oil-in-water measurement:<\/p>\n<ul>\n<li><strong>UV fluorescence:<\/strong> excitation at 254 nm or 365 nm produces fluorescence from aromatic ring compounds in oil. Very sensitive to petroleum hydrocarbons (detection limits of 0.05 ppm), but responds unevenly to weathered heavy fuel oils that have lost lighter aromatic fractions.<\/li>\n<li><strong>Scattered light (nephelometric):<\/strong> measures the light scattered by oil droplets in the sample. Tolerant across a broad oil signature, less selective (particulates can register as apparent oil).<\/li>\n<li><strong>Dual-wavelength optical:<\/strong> combines fluorescence and scatter to reject particulate interference and cover a wider oil signature range.<\/li>\n<\/ul>\n<p>For reception facility service, a dual-wavelength sensor is typically the best compromise. Shanghai ChiMay&rsquo;s oil-in-water sensor uses this dual-wavelength design with a titanium or PEEK body, automatic optical cleaning, and a measurement range of 0\u2013500 ppm with switchable higher ranges for sludge return streams.<\/p>\n<h2 id=\"sample-handling-design\"><span class=\"ez-toc-section\" id=\"Sample_Handling_Design\"><\/span>Sample Handling Design<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The most common failure mode in bilge and slop reception is not sensor drift \u2014 it is sample line contamination. Oil is sticky, particulates settle, and biofilm grows quickly. A sample handling design that succeeds in this environment shares four features:<\/p>\n<ul>\n<li><strong>Fast-loop bypass:<\/strong> sample flows continuously past the sensor at 0.5\u20131.5 L\/min, so the response reflects live conditions rather than a stagnant slug.<\/li>\n<li><strong>Pre-filtration and de-aeration:<\/strong> a coarse strainer at the sensor inlet removes solids larger than 500 \u00b5m, and a small de-aeration chamber removes free gas that would otherwise scatter the optical signal.<\/li>\n<li><strong>Cleaning-in-place (CIP) capability:<\/strong> the sample loop should include a valve that lets a caustic or solvent rinse pass through the sensor cell without dismantling.<\/li>\n<li><strong>Reference tap for grab sampling:<\/strong> a small dead-leg with a valve lets a technician draw a comparison sample without breaking the main sample loop.<\/li>\n<\/ul>\n<p>Installations that include all four features typically deliver 6\u201312 months of continuous service between manual sensor cleaning. Installations that skip any of them require weekly interventions.<\/p>\n<h2 id=\"correlating-oiw-with-other-reception-facility-signals\"><span class=\"ez-toc-section\" id=\"Correlating_OIW_With_Other_Reception_Facility_Signals\"><\/span>Correlating OIW With Other Reception Facility Signals<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A single OIW value tells only part of the story. Modern reception facilities correlate the sensor stack across four signals:<\/p>\n<ul>\n<li><strong>Oil-in-water plus turbidity:<\/strong> high turbidity plus modest OIW indicates a suspended-solids-dominated stream; high OIW without high turbidity indicates true emulsified oil.<\/li>\n<li><strong>Oil-in-water plus pH:<\/strong> low pH combined with high OIW often indicates a mineral-acid cleaner discharge or a battery leak; high pH plus high OIW typically indicates a strong detergent flush.<\/li>\n<li><strong>Oil-in-water plus conductivity:<\/strong> unusually high conductivity signals seawater contamination in the bilge stream, which changes the downstream treatment strategy.<\/li>\n<li><strong>Oil-in-water plus flow:<\/strong> the concentration multiplied by flow gives the mass loading to the downstream treatment train, which is more useful than concentration alone for tank sizing and dosing.<\/li>\n<\/ul>\n<p>Shanghai ChiMay&rsquo;s oil-in-water sensor, online turbidity tester, inline pH electrode, and inline conductivity meter share a common digital protocol so this cross-correlation is straightforward for the reception facility control system.<\/p>\n<h2 id=\"calibration-strategy-that-actually-works\"><span class=\"ez-toc-section\" id=\"Calibration_Strategy_That_Actually_Works\"><\/span>Calibration Strategy That Actually Works<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>OIW sensors are notorious for calibration drift because oil chemistry varies more than any other analyte. A practical calibration strategy for reception facility service:<\/p>\n<ol>\n<li>Establish a baseline zero on a clean-water background matching the plant&rsquo;s typical tap or process water.<\/li>\n<li>Prepare a two-point span calibration using the actual site oil mix at 10 ppm and 100 ppm (or 50 ppm and 500 ppm for heavier ranges), rather than a generic reference oil.<\/li>\n<li>Verify weekly with a grab sample analysed by IR extraction or gravimetric method.<\/li>\n<li>Recalibrate whenever the response drifts more than 15% from the reference or when the site&rsquo;s typical oil mix changes.<\/li>\n<\/ol>\n<p>Shanghai ChiMay recommends this site-specific calibration approach in its instrument brief for reception facilities. A generic factory calibration will read plausibly but will not match the specific chemistry of the port&rsquo;s incoming mix.<\/p>\n<h2 id=\"alarm-strategy-and-discharge-control\"><span class=\"ez-toc-section\" id=\"Alarm_Strategy_and_Discharge_Control\"><\/span>Alarm Strategy and Discharge Control<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The OIW sensor&rsquo;s most important operational role is triggering interventions before non-compliant water reaches the outfall. A working alarm strategy uses three levels:<\/p>\n<ul>\n<li><strong>Advisory (30% of discharge limit):<\/strong> log the excursion and flag for operator review.<\/li>\n<li><strong>Warning (60% of discharge limit):<\/strong> notify the shift supervisor and prepare for flow diversion.<\/li>\n<li><strong>Trip (90% of discharge limit or above):<\/strong> automatically divert flow to a holding tank and hold outfall discharge until the operator clears the event.<\/li>\n<\/ul>\n<p>This graded strategy avoids nuisance shutdowns while still guaranteeing that a real excursion never reaches the receiving water. The graded alarm depends on a sensor whose response time is short enough to catch the event \u2014 typically under 30 seconds from the moment concentration rises.<\/p>\n<h2 id=\"closing-note\"><span class=\"ez-toc-section\" id=\"Closing_Note\"><\/span>Closing Note<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Continuous oil-in-water trending is the difference between a reception facility that can defend its outfall record and one that operates on grab samples and hope. A sensor specified for the actual oil mix, installed with a proper sample handling loop, and calibrated on site chemistry produces the evidence trail that both MARPOL surveyors and coastal environmental regulators now expect. Ports that treat OIW instrumentation as a compliance foundation rarely see enforcement actions on their reception facilities.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>title: &ldquo;Oil-in-Water Trending on Bilge and Slop-Water Reception Streams: A Shanghai ChiMay Instrument Brief&rdquo; date: 2026-07-12 perspective: Technical Deep-Dive theme: Marine, Ballast Water &amp; Port Wastewater Oil-in-Water Trending on Bilge and Slop-Water Reception Streams: A Shanghai ChiMay Instrument Brief The Short Version MARPOL Annex I restricts overboard discharge of oily bilge water to below 15&#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":[158,11443,11066],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"ru","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:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/posts\/31204"}],"collection":[{"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/comments?post=31204"}],"version-history":[{"count":0,"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/posts\/31204\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/media?parent=31204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/categories?post=31204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chimaytech.net\/ru\/wp-json\/wp\/v2\/tags?post=31204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}