{"id":21336,"date":"2026-03-31T12:33:38","date_gmt":"2026-03-31T12:33:38","guid":{"rendered":"https:\/\/manuals.seakeeper.com\/seakeeper\/seakeeper-6-installation-manual-90402-6-6-254-8146-to-current-copy\/cooling-installation\/connecting-seawater-to-heat-exchanger\/"},"modified":"2026-08-27T15:16:08","modified_gmt":"2026-08-27T15:16:08","slug":"connecting-seawater-to-heat-exchanger","status":"publish","type":"page","link":"https:\/\/manuals.seakeeper.com\/seakeeper\/seakeeper-7-5-installation-manual\/cooling-installation\/connecting-seawater-to-heat-exchanger\/","title":{"rendered":"4.3  Connecting Seawater to Heat Exchanger"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Connecting Seawater to Heat Exchanger<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Refer to Figure 28 for typical seawater plumbing arrangement.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1522\" height=\"781\" src=\"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-content\/uploads\/Cooling-image-1.png\" alt=\"\" class=\"wp-image-21765\" style=\"width:716px;height:339px\" srcset=\"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-content\/uploads\/Cooling-image-1.png 1522w, https:\/\/manuals.seakeeper.com\/seakeeper\/wp-content\/uploads\/Cooling-image-1-768x394.png 768w\" sizes=\"auto, (max-width: 1522px) 100vw, 1522px\" \/><figcaption class=\"wp-element-caption\"><em><strong>Figure 28<\/strong> &#8211; Typical Seawater Plumbing Arrangement<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator is-style-wide\"\/>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Connect the seawater pump to the <span translate=\"no\"><span translate=\"no\">Seakeeper<\/span><\/span> dedicated through-hull fitting. A seacock valve, and a strainer should be installed between the seawater inlet and the pump (See Figure 45).<\/li>\n\n\n\n<li>Connect seawater from the installer-supplied pump to the lower \u00be in. (19 mm) hose barb on the heat exchanger. Use the same practices as other below-waterline seawater plumbing. Required flow rate is 4.5 GPM (17 LPM) minimum and 6 GPM (22.7 LPM) maximum.<\/li>\n<\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>Connect the seawater discharge (upper hose barb) to the overboard drain. It is recommended to install a visible flow meter in the discharge line, though it is not required for permanent installation. Use the same practices as other below-waterline seawater plumbing.<\/li>\n\n\n\n<li>In addition to initial operation at the dock, new installations should be checked for seawater flow while the vessel is at speed and when backing down. The flows should be recorded when the seawater pump is running and when it is off.<br>\n<ul class=\"wp-block-list\">\n<li>If no other method of confirming flow is available, the discharge line may be temporarily diverted to a bucket. Flow is calculated from the time required to fill a known volume (e.g., a 5-gal. bucket).<\/li>\n\n\n\n<li>A self-priming seawater pump (customer\/installer supplied) may be required at the installation location to maintain water flow in all underway conditions where cavitation may occur and potentially cause an air lock, restricting seawater flow to the heat exchanger.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Inspect raw water plumbing after sea trial for any signs of leakage.<\/li>\n\n\n\n<li>The heat exchanger has removable end caps to provide access for cleaning the tube bundle.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span translate=\"no\">Seakeeper<\/span> Optional DC Seawater Pump (P\/N 30685)<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><span translate=\"no\"><span translate=\"no\">Seakeeper<\/span><\/span> offers a self-priming DC Seawater pump as an optional addition, P\/N 30685\u2013 DC Seawater Pump Assembly, shown in Figure 29.<\/li>\n\n\n\n<li>The <span translate=\"no\"><span translate=\"no\">Seakeeper<\/span><\/span> Seawater Pump is a 12 VDC pump.<\/li>\n\n\n\n<li>The pump assembly is pre-wired for connection to <span translate=\"no\"><span translate=\"no\">Seakeeper<\/span><\/span> 7.5 &#8220;DC Seawater Pump Out&#8221; cable and includes a seawater strainer and various fittings. The pump specifications are as follows:<\/li>\n<\/ol>\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-text-color has-medium-font-size wp-block-paragraph\"><strong>Note:<\/strong> Use only SeaFlo<sup>\u00ae<\/sup>-provided threaded fittings for DC Seawater Pump 30685.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Volts<\/td><td>12 VDC<\/td><\/tr><tr><td>Rated Flow<\/td><td>5.5 GPM (20.8 LPM), maximum<\/td><\/tr><tr><td>Overcurrent Protection Rating<\/td><td>15 A at 12 Volts<\/td><\/tr><tr><td>Ignition Protection<\/td><td>ISO 8846 or equivalent<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1848\" height=\"783\" src=\"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-content\/uploads\/30685-pump-1.png\" alt=\"\" class=\"wp-image-22632\" style=\"width:700px;height:246px\" srcset=\"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-content\/uploads\/30685-pump-1.png 1848w, https:\/\/manuals.seakeeper.com\/seakeeper\/wp-content\/uploads\/30685-pump-1-768x325.png 768w, https:\/\/manuals.seakeeper.com\/seakeeper\/wp-content\/uploads\/30685-pump-1-1536x651.png 1536w\" sizes=\"auto, (max-width: 1848px) 100vw, 1848px\" \/><figcaption class=\"wp-element-caption\"><strong><em>Figure 29<\/em><\/strong><em>&#8211; <span translate=\"no\">Seakeeper<\/span> 7.5 DC Seawater Pump (P\/N 30685)<\/em><\/figcaption><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Connecting Seawater to Heat Exchanger Refer to Figure 28 for typical seawater plumbing arrangement. Seakeeper Optional DC Seawater Pump (P\/N 30685) Note: Use only SeaFlo\u00ae-provided threaded fittings for DC Seawater Pump 30685. Volts 12 VDC Rated Flow 5.5 GPM (20.8 LPM), maximum Overcurrent Protection Rating 15 A at 12 Volts Ignition Protection ISO 8846 or [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"parent":21330,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"manual":[373],"model":[],"document_type":[],"hidden":[],"class_list":["post-21336","page","type-page","status-publish","hentry","manual-seakeeper-7-5-installation-manual"],"acf":[],"_links":{"self":[{"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/pages\/21336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/comments?post=21336"}],"version-history":[{"count":8,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/pages\/21336\/revisions"}],"predecessor-version":[{"id":22633,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/pages\/21336\/revisions\/22633"}],"up":[{"embeddable":true,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/pages\/21330"}],"wp:attachment":[{"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/media?parent=21336"}],"wp:term":[{"taxonomy":"manual","embeddable":true,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/manual?post=21336"},{"taxonomy":"model","embeddable":true,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/model?post=21336"},{"taxonomy":"document_type","embeddable":true,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/document_type?post=21336"},{"taxonomy":"hidden","embeddable":true,"href":"https:\/\/manuals.seakeeper.com\/seakeeper\/wp-json\/wp\/v2\/hidden?post=21336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}