{"id":422,"date":"2024-11-26T06:00:00","date_gmt":"2024-11-26T12:00:00","guid":{"rendered":"https:\/\/mthpumps.com\/blog\/?p=422"},"modified":"2024-11-14T10:35:55","modified_gmt":"2024-11-14T16:35:55","slug":"pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection","status":"publish","type":"post","link":"https:\/\/mthpumps.com\/blog\/2024\/11\/26\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\/","title":{"rendered":"Pressure vs. Head: What\u2019s the Difference and Why It Matters for Pump Selection"},"content":{"rendered":"\n<p class=\"\">When it comes to selecting the right pump, it\u2019s essential to understand some fundamental concepts. While factors like <strong>Head (H)<\/strong>, <strong>Flow Rate (Q)<\/strong>, and <strong>Fluid Characteristics<\/strong> (such as density, viscosity, and temperature) play a significant role in pump performance, one concept often misunderstood is the relationship between <strong>Head<\/strong> and <strong>Pressure<\/strong>. Though closely related, they\u2019re not the same\u2014and understanding this distinction can make all the difference in choosing the right pump, especially if you&#8217;re considering <a href=\"https:\/\/www.mthpumps.com\/training\/turbine.html\"><strong>regenerative turbine pumps<\/strong><\/a> like those from MTH Pumps.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Defining Head and Pressure<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Head<\/strong> is the height a pump can raise a liquid and is measured in feet or meters of liquid column. Notably, head remains constant regardless of the fluid\u2019s density, meaning that a pump can lift fluids like water, oil, or other liquids to the same height.<\/li>\n\n\n\n<li class=\"\"><strong>Pressure<\/strong>, by contrast, depends on the density of the fluid. The same height of fluid will produce different pressures based on the liquid\u2019s density. For example, while water and a denser fluid like sulfuric acid might rise to the same height, they exert different pressures due to their density difference.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator alignwide has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">How Pressure and Head Are Measured<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Head<\/strong> isn\u2019t measured directly. Instead, we measure <strong>Pressure<\/strong> at the pump\u2019s suction and discharge points using gauges, typically in PSI (pounds per square inch). To convert this pressure to head, we must account for the specific gravity of the fluid.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Conversion Example<\/h3>\n\n\n\n<p class=\"\">Let\u2019s consider a <strong>pump<\/strong> that operates at 33 gallons per minute (GPM) with a head of 33 feet, moving both water and sulfuric acid (H\u2082SO\u2084):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">For <strong>water<\/strong> (specific gravity = 1.0), the pressure is about <strong>14.7 PSI<\/strong>.<\/li>\n\n\n\n<li class=\"\">For <strong>sulfuric acid<\/strong> (specific gravity = 1.8), the pressure is approximately <strong>26.5 PSI<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"\">The relationship between head and pressure can be expressed as:<\/p>\n\n\n\n<p class=\"\"><strong>P [PSI] = 0.433 \u00d7 H [feet] \u00d7 \u03b3 [specific gravity]<\/strong><\/p>\n\n\n\n<p class=\"\">Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>0.433<\/strong> is the conversion factor from feet of water column to PSI.<\/li>\n\n\n\n<li class=\"\"><strong>H<\/strong> is the head in feet.<\/li>\n\n\n\n<li class=\"\"><strong>\u03b3<\/strong> is the specific gravity of the fluid.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"420\" src=\"https:\/\/i0.wp.com\/mthpumps.com\/blog\/wp-content\/uploads\/2024\/11\/Head-vs-Pressure.png?resize=1000%2C420&#038;ssl=1\" alt=\"\" class=\"wp-image-423\" srcset=\"https:\/\/i0.wp.com\/mthpumps.com\/blog\/wp-content\/uploads\/2024\/11\/Head-vs-Pressure.png?w=1000&amp;ssl=1 1000w, https:\/\/i0.wp.com\/mthpumps.com\/blog\/wp-content\/uploads\/2024\/11\/Head-vs-Pressure.png?resize=300%2C126&amp;ssl=1 300w, https:\/\/i0.wp.com\/mthpumps.com\/blog\/wp-content\/uploads\/2024\/11\/Head-vs-Pressure.png?resize=768%2C323&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">PSI \u2013 Head relationship of identical pumps handling liquids of differing specific gravities.<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator alignwide has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Power Consumption Considerations<\/h3>\n\n\n\n<p class=\"\">Power consumption also depends on pressure, and the power formula is as follows:<\/p>\n\n\n\n<p class=\"\"><strong>N [kW] = (\u03b3 [specific gravity] \u00d7 Q [GPM] \u00d7 H [feet]) \/ (3956 \u00d7 \u03b7)<\/strong><\/p>\n\n\n\n<p class=\"\">Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Q<\/strong> is the flow rate in gallons per minute.<\/li>\n\n\n\n<li class=\"\"><strong>H<\/strong> is the head in feet.<\/li>\n\n\n\n<li class=\"\"><strong>\u03b7<\/strong> is the pump efficiency.<\/li>\n<\/ul>\n\n\n\n<p class=\"\">For more information on optimizing power usage, visit our <strong>efficiency and performance page<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator alignwide has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Practical Tips for Pump Technicians<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\"><strong>Fluid Viscosity<\/strong>: These relationships apply mainly to low-viscosity fluids like water. Higher-viscosity fluids may require adjustments to pump performance.<\/li>\n\n\n\n<li class=\"\"><strong>Head and Flow Rate<\/strong>: A pump\u2019s head at a fixed speed depends on the flow rate and follows its characteristic performance curve.<\/li>\n\n\n\n<li class=\"\"><strong>Determining Required Head<\/strong>: Calculating the head a pump needs involves more than the vertical distance. Be sure to consider: <strong>Geodetic head<\/strong>: The height difference between suction and discharge. <strong>Pressure differences<\/strong> at suction and discharge. <strong>Friction losses<\/strong> from the piping system.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator alignwide has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">The Bottom Line for MTH Pumps\u2019 Regenerative Turbine Pumps<\/h3>\n\n\n\n<p class=\"\">With a solid understanding of head versus pressure, you\u2019ll be better equipped to choose the right pump for your specific application. <a href=\"https:\/\/www.mthpumps.com\/standard\/standard.html\"><strong>MTH\u2019s regenerative turbine pumps<\/strong><\/a> are engineered to deliver precise fluid handling across industries, accommodating a wide variety of liquids while maintaining efficiency and reliability.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Selecting the right pump means understanding the critical relationship between pressure and head\u2014two terms often used interchangeably but with distinct impacts on pump performance. In this post, we break down the difference between pressure and head, why it matters, and how these factors influence pump efficiency, especially in regenerative turbine pumps. Whether you\u2019re an engineer, technician, or simply looking to deepen your knowledge, this guide offers practical insights and tips for making informed pump selections.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","om_disable_all_campaigns":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[8],"tags":[95,24,119,181,183,92,94,179,184,123,105,180,182,91],"class_list":["post-422","post","type-post","status-publish","format-standard","hentry","category-regenerative-turbine-pump-tuesday","tag-centrifugal-pumps","tag-engineering","tag-fluid-dynamics","tag-fluid-handling","tag-head-pressure","tag-industrial-pumps","tag-mth-pumps","tag-pressure-vs-head","tag-pump-basics","tag-pump-efficiency","tag-pump-performance","tag-pump-selection","tag-pump-terminology","tag-regenerative-turbine-pumps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pressure vs. Head: What\u2019s the Difference and Why It Matters for Pump Selection - MTH Pumps<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mthpumps.com\/blog\/2024\/11\/26\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pressure vs. Head: What\u2019s the Difference and Why It Matters for Pump Selection - MTH Pumps\" \/>\n<meta property=\"og:description\" content=\"Selecting the right pump means understanding the critical relationship between pressure and head\u2014two terms often used interchangeably but with distinct impacts on pump performance. In this post, we break down the difference between pressure and head, why it matters, and how these factors influence pump efficiency, especially in regenerative turbine pumps. Whether you\u2019re an engineer, technician, or simply looking to deepen your knowledge, this guide offers practical insights and tips for making informed pump selections.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mthpumps.com\/blog\/2024\/11\/26\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\/\" \/>\n<meta property=\"og:site_name\" content=\"MTH Pumps\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/mthpumps\" \/>\n<meta property=\"article:published_time\" content=\"2024-11-26T12:00:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mthpumps.com\/blog\/wp-content\/uploads\/2024\/11\/Head-vs-Pressure.png\" \/>\n<meta name=\"author\" content=\"Scott Carlson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@mthpumps\" \/>\n<meta name=\"twitter:site\" content=\"@mthpumps\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Scott Carlson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/2024\\\/11\\\/26\\\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/2024\\\/11\\\/26\\\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\\\/\"},\"author\":{\"name\":\"Scott Carlson\",\"@id\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/#\\\/schema\\\/person\\\/849ad835a26816115b4357629147827b\"},\"headline\":\"Pressure vs. Head: What\u2019s the Difference and Why It Matters for Pump Selection\",\"datePublished\":\"2024-11-26T12:00:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/2024\\\/11\\\/26\\\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\\\/\"},\"wordCount\":549,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/2024\\\/11\\\/26\\\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/wp-content\\\/uploads\\\/2024\\\/11\\\/Head-vs-Pressure.png\",\"keywords\":[\"centrifugal pumps\",\"Engineering\",\"fluid dynamics\",\"fluid handling\",\"head pressure\",\"industrial pumps\",\"MTH Pumps\",\"pressure vs head\",\"pump basics\",\"pump efficiency\",\"pump performance\",\"pump selection\",\"pump terminology\",\"regenerative turbine pumps\"],\"articleSection\":[\"Regenerative Turbine Pump Tuesday\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/mthpumps.com\\\/blog\\\/2024\\\/11\\\/26\\\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/2024\\\/11\\\/26\\\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\\\/\",\"url\":\"https:\\\/\\\/mthpumps.com\\\/blog\\\/2024\\\/11\\\/26\\\/pressure-vs-head-whats-the-difference-and-why-it-matters-for-pump-selection\\\/\",\"name\":\"Pressure vs. Head: What\u2019s the Difference and Why It Matters for Pump Selection - 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