{"id":2585,"date":"2024-08-04T11:32:01","date_gmt":"2024-08-04T11:32:01","guid":{"rendered":"https:\/\/svestudy.com\/?page_id=2585"},"modified":"2025-05-12T19:21:34","modified_gmt":"2025-05-12T19:21:34","slug":"mde-unit-5-q5","status":"publish","type":"page","link":"https:\/\/svestudy.com\/?page_id=2585","title":{"rendered":"MDE Unit 5 Q5"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/svestudy.com\/?page_id=3440\">Quiz<\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/svestudy.com\/?page_id=2586\">Next Unit<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"237\" src=\"https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-197-1024x237.png\" alt=\"\" class=\"wp-image-5913\" srcset=\"https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-197-1024x237.png 1024w, https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-197-300x69.png 300w, https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-197-768x178.png 768w, https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-197-1536x355.png 1536w, https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-197-1200x277.png 1200w, https:\/\/svestudy.com\/wp-content\/uploads\/2024\/08\/image-197.png 1613w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">With reference to scroll type fuel injection pumps:<br>(a) describe how the delivered quantity of fuel may be varied:(5)<br>(b) explain the purpose of the delivery valve:(3)<br>(c) describe how fuel oil is prevented from spraying out if the high pressure pipe fails in service.(2)<\/p>\n\n\n<div class=\"wp-block-ub-content-toggle wp-block-ub-content-toggle-block\" id=\"ub-content-toggle-block-251f30b2-dfe8-4116-ab79-11c08c47da14\" data-mobilecollapse=\"true\" data-desktopcollapse=\"true\" data-preventcollapse=\"false\" data-showonlyone=\"false\">\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; border-top-left-radius: 8px; border-top-right-radius: 8px; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; \" id=\"ub-content-toggle-panel-block-1500bec5-3d4a-4b85-a9b9-e716a7f17df6\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-0-251f30b2-dfe8-4116-ab79-11c08c47da14\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-251f30b2-dfe8-4116-ab79-11c08c47da14\" style=\"color: #000000; \">Scroll Metering Fuel Injection Pump<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-0-251f30b2-dfe8-4116-ab79-11c08c47da14\">\n\n<p class=\"wp-block-paragraph\"><strong>A scroll metering fuel injection pump is a type of jerk pump that utilizes a helical scroll to control fuel delivery.<\/strong><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY#:~:text=The%20helical%20groove%20plays%20a,being%20injected%20by%20the%20pump.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY#:~:text=The%20helical%20groove%20plays%20a,being%20injected%20by%20the%20pump.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Jerk-type or Plunger-type Fuel Injection Pump &#8211; Working and Animation &#8211; YouTube <\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY#:~:text=The%20helical%20groove%20plays%20a,being%20injected%20by%20the%20pump.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY#:~:text=The%20helical%20groove%20plays%20a,being%20injected%20by%20the%20pump.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How it works:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Plunger and Scroll:<\/strong> The pump has a plunger with a helical groove (scroll) machined into it. \u00a0 <a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY\" target=\"_blank\" rel=\"noreferrer noopener\">1. Jerk-type or Plunger-type Fuel Injection Pump &#8211; Working and Animation &#8211; YouTube <\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY\" target=\"_blank\" rel=\"noreferrer noopener\">www.youtube.com<\/a><a href=\"https:\/\/www.youtube.com\/watch?v=IjXnbFVJKRY\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n\n\n\n<li class=\"\"><strong>Fuel Delivery:<\/strong> As the plunger rotates, the scroll progressively opens and closes the fuel delivery port, controlling the amount of fuel injected.<\/li>\n\n\n\n<li class=\"\"><strong>Injection Timing:<\/strong> The timing of fuel injection is determined by the position of the plunger in relation to the fuel delivery port.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key advantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Precise fuel metering:<\/strong> The scroll design allows for accurate control of fuel delivery.<\/li>\n\n\n\n<li class=\"\"><strong>Smooth injection:<\/strong> The helical shape of the scroll contributes to smoother fuel injection.<\/li>\n\n\n\n<li class=\"\"><strong>Compact design:<\/strong> Scroll pumps can be relatively compact compared to other types of injection pumps.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">While scroll metering pumps offer advantages, they have largely been replaced by more advanced electronic fuel injection systems due to limitations in precision and control compared to modern technologies.<\/p>\n\n<\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; border-top-left-radius: 8px; border-top-right-radius: 8px; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; \" id=\"ub-content-toggle-panel-block-92e2789e-8869-4956-b4cc-af6505de3ce6\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-1-251f30b2-dfe8-4116-ab79-11c08c47da14\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-251f30b2-dfe8-4116-ab79-11c08c47da14\" style=\"color: #000000; \">Purpose of the Delivery Valve in a Scroll Metering Pump<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-1-251f30b2-dfe8-4116-ab79-11c08c47da14\">\n\n<p class=\"wp-block-paragraph\">While the scroll mechanism is primarily responsible for metering fuel in a scroll metering fuel injection pump, the delivery valve also plays a crucial role.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The primary function of the delivery valve is to prevent the backflow of fuel.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Once the fuel is injected into the high-pressure line, the delivery valve closes to maintain the pressure and prevent fuel from returning to the pump. This is crucial for ensuring accurate fuel delivery and preventing fuel leakage. \u00a0<a href=\"https:\/\/patents.google.com\/patent\/KR20060117567A\/en\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/patents.google.com\/patent\/KR20060117567A\/en\" target=\"_blank\" rel=\"noreferrer noopener\">1. KR20060117567A &#8211; The delivery valve with back pressure function of fuel injection pump for diesel engine &#8211; Google Patents <\/a><a href=\"https:\/\/patents.google.com\/patent\/KR20060117567A\/en\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/patents.google.com\/patent\/KR20060117567A\/en\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally, the delivery valve contributes to the precise timing of fuel injection by controlling the pressure build-up in the fuel line.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In essence, the delivery valve acts as a seal to maintain fuel pressure and control the injection process, working in conjunction with the scroll mechanism to ensure accurate fuel delivery.<\/p>\n\n<\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; border-top-left-radius: 8px; border-top-right-radius: 8px; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; \" id=\"ub-content-toggle-panel-block-65162093-bca3-47eb-9a53-e04838588172\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-2-251f30b2-dfe8-4116-ab79-11c08c47da14\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-251f30b2-dfe8-4116-ab79-11c08c47da14\" style=\"color: #000000; \">Preventing Fuel Oil Spray in Case of High-Pressure Pipe Failure<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-2-251f30b2-dfe8-4116-ab79-11c08c47da14\">\n\n<p class=\"wp-block-paragraph\">To mitigate the risks associated with a high-pressure fuel pipe failure, several safety measures are employed:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Containment Systems:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Jacketed Piping:<\/strong> High-pressure fuel lines are often encased in a secondary outer pipe. This containment system can capture leaking fuel, preventing it from spreading.<\/li>\n\n\n\n<li class=\"\"><strong>Drip Trays:<\/strong> These are placed beneath potential leak points to collect any spilled fuel.<\/li>\n\n\n\n<li class=\"\"><strong>Fire-Resistant Materials:<\/strong> Components in the vicinity of high-pressure fuel lines are often made of or covered with fire-resistant materials to minimize fire hazards.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Safety Devices:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Pressure Relief Valves:<\/strong> While not directly preventing spraying, these valves can help to reduce pressure buildup in case of a blockage or failure, potentially reducing the severity of a leak.<\/li>\n\n\n\n<li class=\"\"><strong>Quick-Closing Valves:<\/strong> Some systems incorporate valves that can be rapidly closed to isolate a damaged section of the fuel line.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Design Considerations:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Redundancy:<\/strong> In critical systems, redundant components or backup systems can be used to reduce the risk of catastrophic failure.<\/li>\n\n\n\n<li class=\"\"><strong>Material Selection:<\/strong> High-quality materials resistant to fatigue and corrosion are used for fuel lines to minimize the risk of failure.<\/li>\n\n\n\n<li class=\"\"><strong>Installation and Maintenance:<\/strong> Proper installation and regular inspection of fuel lines are crucial to prevent leaks. \u00a0 <a href=\"https:\/\/safety4sea.com\/cm-lessons-learned-from-fuel-oil-leakage-accident-onboard\/#:~:text=To%20help%20eradicate%20fuel%20oil,the%20special%20tool%20on%20board.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/safety4sea.com\/cm-lessons-learned-from-fuel-oil-leakage-accident-onboard\/#:~:text=To%20help%20eradicate%20fuel%20oil,the%20special%20tool%20on%20board.\" target=\"_blank\" rel=\"noreferrer noopener\">1. Lessons Learned from fuel oil leakage accident onboard &#8211; SAFETY4SEA <\/a><a href=\"https:\/\/safety4sea.com\/cm-lessons-learned-from-fuel-oil-leakage-accident-onboard\/#:~:text=To%20help%20eradicate%20fuel%20oil,the%20special%20tool%20on%20board.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/safety4sea.com\/cm-lessons-learned-from-fuel-oil-leakage-accident-onboard\/#:~:text=To%20help%20eradicate%20fuel%20oil,the%20special%20tool%20on%20board.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/safety4sea.com\/cm-lessons-learned-from-fuel-oil-leakage-accident-onboard\/#:~:text=To%20help%20eradicate%20fuel%20oil,the%20special%20tool%20on%20board.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/safety4sea.com\/cm-lessons-learned-from-fuel-oil-leakage-accident-onboard\/#:~:text=To%20help%20eradicate%20fuel%20oil,the%20special%20tool%20on%20board.\" target=\"_blank\" rel=\"noreferrer noopener\">safety4sea.com<\/a><a href=\"https:\/\/safety4sea.com\/cm-lessons-learned-from-fuel-oil-leakage-accident-onboard\/#:~:text=To%20help%20eradicate%20fuel%20oil,the%20special%20tool%20on%20board.\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By implementing these measures, the risk of fuel oil spraying in case of a high-pressure pipe failure can be significantly reduced, enhancing safety and protecting personnel and equipment.<\/p>\n\n<\/div>\n\t\t<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Quiz Next Unit With reference to scroll type fuel injection pumps:(a) describe how the delivered quantity of fuel may be varied:(5)(b) explain the purpose of the delivery valve:(3)(c) describe how fuel oil is prevented from spraying out if the high pressure pipe fails in service.(2)<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"templates\/template-full-width.php","meta":{"nf_dc_page":"","footnotes":""},"class_list":["post-2585","page","type-page","status-publish","hentry"],"featured_image_src":null,"_links":{"self":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/2585","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/svestudy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2585"}],"version-history":[{"count":4,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/2585\/revisions"}],"predecessor-version":[{"id":9596,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/2585\/revisions\/9596"}],"wp:attachment":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}