{"id":307,"date":"2023-07-31T17:16:44","date_gmt":"2023-07-31T21:16:44","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/?post_type=chapter&#038;p=307"},"modified":"2023-11-02T14:35:55","modified_gmt":"2023-11-02T18:35:55","slug":"pipe-sizing","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/chapter\/pipe-sizing\/","title":{"raw":"Pipe Sizing","rendered":"Pipe Sizing"},"content":{"raw":"When it comes to sizing pipe, there are a few considerations for how to do it and why it matters:\r\n<ul>\r\n \t<li>How big is the hole the material will go through?<\/li>\r\n \t<li>How far is the material going?<\/li>\r\n \t<li>How thick does the wall of the pipe need to be?<\/li>\r\n \t<li>What factors are working against the system (friction, possibility of erosion, etc.)?<\/li>\r\n<\/ul>\r\nThe pipe needs to be the proper size to handle what it\u2019s carrying (water, gas, air, drainage, etc.), but it also cannot be too small, or it could cause the volume to travel too fast. And that could cause serious issues, such as water hammer (a hydraulic shock or pressure surge), which in turn could damage the pipe system and the fixtures attached to the piping.\r\n<h2>Days Gone By<\/h2>\r\nDetermining pipe sizes can be somewhat confusing, primarily because of the historical method of sizing and the fact that some current sizing still refers to those legacy systems.\r\n\r\nTake this example:\r\n\r\nYears ago, a half-inch pipe had an inner diameter of [latex]\\tfrac{1}{2}[\/latex] inches. It also had thick walls, as that was the manufacturing standard at the time.\r\n\r\nOver the years, improved technology has enabled the walls to be thinner while retaining the same capabilities. However, to match up with existing (larger walled) pipe, the inside diameter of the new pipe had to be larger. Which means the pipe was not [latex]\\tfrac{1}{2}[\/latex] inch, no matter which way you measured.\r\n\r\nWhen mass production of pipe began, there was a need for standardization. In 1927, the American Standards Association \u2013 which has since evolved into the American National Standards Institute (ANSI) \u2013 convened a committee to standardize the dimensions of wrought steel and wrought iron pipe and tubing. Back then, only a few wall thicknesses were used: standard weight (STD), extra strong (XS), and double extra strong (XXS), based on the iron pipe size (IPS) system of the day.\r\n\r\nBy 1939, schedule numbers were starting to come into use, but the original terms stuck and are often still used today, though XS and XXS were revised slightly to extra heavy (XH) and double extra heavy (XXH), respectively.\r\n\r\nBy the 1950s, stainless steel was coming into use more frequently, allowing the use of thinner pipes (e.g., 5S and 10S), which were based on pressure requirements. (It is worth noting that because of their thin walls, the smaller \u201cS\u201d sizes cannot be threaded but must be fusion welded.)\r\n<h2>Pipe Sizing<\/h2>\r\nIf the legacy of sizing isn\u2019t confusing enough, consider that pipes have been sized differently over the years depending on the specific sizing system:\r\n<ul>\r\n \t<li>\r\n<div class=\"textbox textbox--sidebar\">Alphabet Soup of Pipe Metrics: IPS, DIPS, NPS, CTS<\/div>\r\nIron Pipe Size (IPS) \u2014 sized by reference to the inside diameters; the standard from early 19th century through just after World War II; still used in PVC manufacturing and steel gas and water piping<\/li>\r\n \t<li>Ductile Iron Pipe Size (DIPS) \u2014 similar to NPS but used for larger pipes<\/li>\r\n \t<li>Copper Tube Sizing (CTS) \u2014 in the 1920s, this was combined with the IPS standard; the inside diameter is measured in the \u201ctypes\u201d (M, L, and K for thinnest, thicker, and thickest, respectively)<\/li>\r\n \t<li>Nominal Pipe Size (NPS) \u2014 outside diameter is fixed for a given pipe size and inside diameter varies depending on the wall thickness (referred to as \u201cschedules\u201d). NPS is the North American standard today. The current practice is to determine pipe size through two numbers: 1) the pipe bore (or diameter) and 2) the pipe schedule (or wall thickness) \u2013 though these two numbers can be configured in slightly different ways depending on the specific pipe used. NPS sizes are documented by a number of standards, including API (American Petroleum Institute) and ANSI\/ASME (American Society of Mechanical Engineers).<\/li>\r\n \t<li>Plastic Irrigation Pipe (PIP) \u2014 used in agricultural applications; comes in pressure ratings (psi) and is available in diameters from 6\u2033 to 24\u2033<\/li>\r\n<\/ul>\r\n<h2>The Most Common Pipes Used Today<strong><span style=\"color: #808000;\">\r\n<\/span><\/strong><\/h2>\r\n<ul>\r\n \t<li>Cast iron \u2014 mostly in use before 1960; used for drain\/waste\/vent (DWV) lines<\/li>\r\n \t<li>Steel (galvanized pipe) \u2014 common in older homes; lasts only about 50 years<\/li>\r\n \t<li>Plastic \u2014 used since mid 1970s; two types:\r\n<ul>\r\n \t<li>ABS (acrylonitrile\u2010butadiene\u2010styrene) \u2014 black color; first to be used in residential homes, though some areas restrict their use in new construction<\/li>\r\n \t<li>PVC (polyvinyl\u2010chloride) \u2014 white or cream color; rating and diameter are stamped on the pipe.\r\n<div class=\"textbox\">A few notes on PVC: Schedule 40 PVC is strong enough for drain lines and cold water lines, but local code will determine applicability. When used for cold water lines, it is generally not allowed for use inside a building. Schedule 80 PVC is often used for cold water lines but isn\u2019t allowed for use inside a building in some areas because it isn\u2019t suitable for hot water. CPVC (chlorinated polyvinyl chloride) is as strong as PVC but is heat resistant, which makes it acceptable in most areas for interior supply lines; it is most commonly measured with CTS standards (which is important when considering fittings for existing pipe; for example, a 2\u2033 fitting will not always fit on a 2\u2033 CTS pipe, but it will always fit on a 2\u201d nominal-size PVC pipe). Schedule 40 and 80 CPVC pipe and schedule 80 CPVC fittings are available and generally used in industrial applications<\/div><\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<ul>\r\n \t<li>Copper \u2014 commonly used in water lines and some drain lines; resists corrosion, lasts a long time<\/li>\r\n \t<li>Rigid Distribution Pipe \u2014 comes in three thicknesses: type M (thinnest), type L (thicker), type K (thickest)<\/li>\r\n \t<li>Rigid Drain Pipe \u2014 comes in one thickness Marked DWV and is thinner-walled than type M<\/li>\r\n \t<li>Flexible (soft) \u2014 often used with appliances lines (e.g., dishwasher, refrigerator, icemaker) and rolled out for under-slab installations<\/li>\r\n \t<li>PEX (cross\u2010linked polyethylene) \u2014 newest pipe for residential use; easy to install (cuts easily, is flexible); it can use compression fittings or push on fittings, more permanent connections require crimp style fittings and a crimping tool<\/li>\r\n<\/ul>\r\n<h2>Calculating Pipe Size<\/h2>\r\nKnowing the background on how and why the sizing is determined is critical, though you will not necessarily need to resort to advanced math to figure it out. Fortunately, there are tables for every type of piping that is approved for water service and distribution. These charts are used to determine pipe-size that will deliver the amount of water and at the pressure needed to operate a plumbing system that uses a variety of common household fixtures and appliances.\r\n\r\n<img class=\"aligncenter wp-image-685 size-full\" title=\"Did you know the square on the hypotenuse is the sum of the squares on the other two sides.\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3.png\" alt=\"Did you know the square on the hypotenuse is the sum of the squares on the other two sides.\" width=\"787\" height=\"323\" data-popupalt-original-title=\"null\" \/>\r\n\r\n&nbsp;\r\n\r\n<img class=\"alignnone size-medium wp-image-684\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-add-on-296x300.png\" alt=\"\" width=\"296\" height=\"300\" \/>\r\n\r\n<img class=\"wp-image-669 size-medium alignright\" title=\"Why did the obtuse angle go to the beach? Because it was over 90 degrees.\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/joke-6-300x173.png\" alt=\"Why did the obtuse angle go to the beach? Because it was over 90 degrees.\" width=\"300\" height=\"173\" data-popupalt-original-title=\"null\" \/>","rendered":"<p>When it comes to sizing pipe, there are a few considerations for how to do it and why it matters:<\/p>\n<ul>\n<li>How big is the hole the material will go through?<\/li>\n<li>How far is the material going?<\/li>\n<li>How thick does the wall of the pipe need to be?<\/li>\n<li>What factors are working against the system (friction, possibility of erosion, etc.)?<\/li>\n<\/ul>\n<p>The pipe needs to be the proper size to handle what it\u2019s carrying (water, gas, air, drainage, etc.), but it also cannot be too small, or it could cause the volume to travel too fast. And that could cause serious issues, such as water hammer (a hydraulic shock or pressure surge), which in turn could damage the pipe system and the fixtures attached to the piping.<\/p>\n<h2>Days Gone By<\/h2>\n<p>Determining pipe sizes can be somewhat confusing, primarily because of the historical method of sizing and the fact that some current sizing still refers to those legacy systems.<\/p>\n<p>Take this example:<\/p>\n<p>Years ago, a half-inch pipe had an inner diameter of [latex]\\tfrac{1}{2}[\/latex] inches. It also had thick walls, as that was the manufacturing standard at the time.<\/p>\n<p>Over the years, improved technology has enabled the walls to be thinner while retaining the same capabilities. However, to match up with existing (larger walled) pipe, the inside diameter of the new pipe had to be larger. Which means the pipe was not [latex]\\tfrac{1}{2}[\/latex] inch, no matter which way you measured.<\/p>\n<p>When mass production of pipe began, there was a need for standardization. In 1927, the American Standards Association \u2013 which has since evolved into the American National Standards Institute (ANSI) \u2013 convened a committee to standardize the dimensions of wrought steel and wrought iron pipe and tubing. Back then, only a few wall thicknesses were used: standard weight (STD), extra strong (XS), and double extra strong (XXS), based on the iron pipe size (IPS) system of the day.<\/p>\n<p>By 1939, schedule numbers were starting to come into use, but the original terms stuck and are often still used today, though XS and XXS were revised slightly to extra heavy (XH) and double extra heavy (XXH), respectively.<\/p>\n<p>By the 1950s, stainless steel was coming into use more frequently, allowing the use of thinner pipes (e.g., 5S and 10S), which were based on pressure requirements. (It is worth noting that because of their thin walls, the smaller \u201cS\u201d sizes cannot be threaded but must be fusion welded.)<\/p>\n<h2>Pipe Sizing<\/h2>\n<p>If the legacy of sizing isn\u2019t confusing enough, consider that pipes have been sized differently over the years depending on the specific sizing system:<\/p>\n<ul>\n<li>\n<div class=\"textbox textbox--sidebar\">Alphabet Soup of Pipe Metrics: IPS, DIPS, NPS, CTS<\/div>\n<p>Iron Pipe Size (IPS) \u2014 sized by reference to the inside diameters; the standard from early 19th century through just after World War II; still used in PVC manufacturing and steel gas and water piping<\/li>\n<li>Ductile Iron Pipe Size (DIPS) \u2014 similar to NPS but used for larger pipes<\/li>\n<li>Copper Tube Sizing (CTS) \u2014 in the 1920s, this was combined with the IPS standard; the inside diameter is measured in the \u201ctypes\u201d (M, L, and K for thinnest, thicker, and thickest, respectively)<\/li>\n<li>Nominal Pipe Size (NPS) \u2014 outside diameter is fixed for a given pipe size and inside diameter varies depending on the wall thickness (referred to as \u201cschedules\u201d). NPS is the North American standard today. The current practice is to determine pipe size through two numbers: 1) the pipe bore (or diameter) and 2) the pipe schedule (or wall thickness) \u2013 though these two numbers can be configured in slightly different ways depending on the specific pipe used. NPS sizes are documented by a number of standards, including API (American Petroleum Institute) and ANSI\/ASME (American Society of Mechanical Engineers).<\/li>\n<li>Plastic Irrigation Pipe (PIP) \u2014 used in agricultural applications; comes in pressure ratings (psi) and is available in diameters from 6\u2033 to 24\u2033<\/li>\n<\/ul>\n<h2>The Most Common Pipes Used Today<strong><span style=\"color: #808000;\"><br \/>\n<\/span><\/strong><\/h2>\n<ul>\n<li>Cast iron \u2014 mostly in use before 1960; used for drain\/waste\/vent (DWV) lines<\/li>\n<li>Steel (galvanized pipe) \u2014 common in older homes; lasts only about 50 years<\/li>\n<li>Plastic \u2014 used since mid 1970s; two types:\n<ul>\n<li>ABS (acrylonitrile\u2010butadiene\u2010styrene) \u2014 black color; first to be used in residential homes, though some areas restrict their use in new construction<\/li>\n<li>PVC (polyvinyl\u2010chloride) \u2014 white or cream color; rating and diameter are stamped on the pipe.\n<div class=\"textbox\">A few notes on PVC: Schedule 40 PVC is strong enough for drain lines and cold water lines, but local code will determine applicability. When used for cold water lines, it is generally not allowed for use inside a building. Schedule 80 PVC is often used for cold water lines but isn\u2019t allowed for use inside a building in some areas because it isn\u2019t suitable for hot water. CPVC (chlorinated polyvinyl chloride) is as strong as PVC but is heat resistant, which makes it acceptable in most areas for interior supply lines; it is most commonly measured with CTS standards (which is important when considering fittings for existing pipe; for example, a 2\u2033 fitting will not always fit on a 2\u2033 CTS pipe, but it will always fit on a 2\u201d nominal-size PVC pipe). Schedule 40 and 80 CPVC pipe and schedule 80 CPVC fittings are available and generally used in industrial applications<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>Copper \u2014 commonly used in water lines and some drain lines; resists corrosion, lasts a long time<\/li>\n<li>Rigid Distribution Pipe \u2014 comes in three thicknesses: type M (thinnest), type L (thicker), type K (thickest)<\/li>\n<li>Rigid Drain Pipe \u2014 comes in one thickness Marked DWV and is thinner-walled than type M<\/li>\n<li>Flexible (soft) \u2014 often used with appliances lines (e.g., dishwasher, refrigerator, icemaker) and rolled out for under-slab installations<\/li>\n<li>PEX (cross\u2010linked polyethylene) \u2014 newest pipe for residential use; easy to install (cuts easily, is flexible); it can use compression fittings or push on fittings, more permanent connections require crimp style fittings and a crimping tool<\/li>\n<\/ul>\n<h2>Calculating Pipe Size<\/h2>\n<p>Knowing the background on how and why the sizing is determined is critical, though you will not necessarily need to resort to advanced math to figure it out. Fortunately, there are tables for every type of piping that is approved for water service and distribution. These charts are used to determine pipe-size that will deliver the amount of water and at the pressure needed to operate a plumbing system that uses a variety of common household fixtures and appliances.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-685 size-full\" title=\"Did you know the square on the hypotenuse is the sum of the squares on the other two sides.\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3.png\" alt=\"Did you know the square on the hypotenuse is the sum of the squares on the other two sides.\" width=\"787\" height=\"323\" data-popupalt-original-title=\"null\" srcset=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3.png 787w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-300x123.png 300w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-768x315.png 768w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-65x27.png 65w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-225x92.png 225w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-350x144.png 350w\" sizes=\"auto, (max-width: 787px) 100vw, 787px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-684\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-add-on-296x300.png\" alt=\"\" width=\"296\" height=\"300\" srcset=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-add-on-296x300.png 296w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-add-on-65x66.png 65w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-add-on-225x228.png 225w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-add-on-350x355.png 350w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/Did-you-know3-add-on.png 488w\" sizes=\"auto, (max-width: 296px) 100vw, 296px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-669 size-medium alignright\" title=\"Why did the obtuse angle go to the beach? Because it was over 90 degrees.\" src=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/joke-6-300x173.png\" alt=\"Why did the obtuse angle go to the beach? Because it was over 90 degrees.\" width=\"300\" height=\"173\" data-popupalt-original-title=\"null\" srcset=\"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/joke-6-300x173.png 300w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/joke-6-65x38.png 65w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/joke-6-225x130.png 225w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/joke-6-350x202.png 350w, https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-content\/uploads\/sites\/2022\/2023\/07\/joke-6.png 676w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n","protected":false},"author":2001,"menu_order":4,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-307","chapter","type-chapter","status-publish","hentry"],"part":92,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/users\/2001"}],"version-history":[{"count":4,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/307\/revisions"}],"predecessor-version":[{"id":870,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/307\/revisions\/870"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/parts\/92"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapters\/307\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/media?parent=307"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/pressbooks\/v2\/chapter-type?post=307"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/contributor?post=307"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/tradeskillsforsuccessnumeracy\/wp-json\/wp\/v2\/license?post=307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}