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</div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Compression fitting</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. 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print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" 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Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Compression+fitting%22">"Compression fitting"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Compression+fitting%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Compression+fitting%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Compression+fitting%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Compression+fitting%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Compression+fitting%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">April 2013</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Compression_fitting_isolating_valve_15mm_screwdriver_turn.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/14/Compression_fitting_isolating_valve_15mm_screwdriver_turn.jpg/220px-Compression_fitting_isolating_valve_15mm_screwdriver_turn.jpg" decoding="async" width="220" height="137" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/14/Compression_fitting_isolating_valve_15mm_screwdriver_turn.jpg/330px-Compression_fitting_isolating_valve_15mm_screwdriver_turn.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/14/Compression_fitting_isolating_valve_15mm_screwdriver_turn.jpg/440px-Compression_fitting_isolating_valve_15mm_screwdriver_turn.jpg 2x" data-file-width="1952" data-file-height="1218" /></a><figcaption>A compression fitting 15 mm <a href="/wiki/Isolation_valve" title="Isolation valve">isolating valve</a></figcaption></figure> <p>A <b>compression fitting</b> is a <a href="/wiki/Piping_and_plumbing_fitting" title="Piping and plumbing fitting">fitting</a> used in <a href="/wiki/Plumbing" title="Plumbing">plumbing</a> and electrical conduit systems to join two <a href="/wiki/Tubing_(material)" class="mw-redirect" title="Tubing (material)">tubes</a> or thin-walled <a href="/wiki/Pipe_(material)" class="mw-redirect" title="Pipe (material)">pipes</a> together. In instances where two pipes made of dissimilar materials are to be joined (most commonly <a href="/wiki/Polyvinyl_chloride" title="Polyvinyl chloride">PVC</a> and <a href="/wiki/Copper" title="Copper">copper</a>), the fittings will be made of one or more compatible materials appropriate for the connection. Compression fittings for attaching tubing (piping) commonly have <a href="/wiki/Ferrule" title="Ferrule">compression rings</a>, called <i>ferrules</i> (<a href="/wiki/American_English" title="American English">American English</a>) or <i>olives</i> (<a href="/wiki/British_English" title="British English">British English</a>), in them, and are sometimes referred to as flareless fittings. There are also <a href="/wiki/Flare_fitting" title="Flare fitting">flare fittings</a> that do not require ferrules/olives. </p><p>Compression fittings are used extensively in hydraulic, gas, and water systems to enable the connection of tubing to threaded components like valves and tools.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Compression fittings are suited to a variety of applications, such as plumbing systems in confined spaces where copper pipe would be difficult to solder without creating a fire hazard, and extensively in hydraulic industrial applications. A major benefit is that the fittings allow easy disconnection and reconnection. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Operation_principle">Operation principle</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Compression_fitting&action=edit&section=1" title="Edit section: Operation principle"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In small sizes, the compression fitting is composed of an outer <i>compression nut</i> and an inner <i>compression ring</i> (ferrule) that is typically made of brass, copper, or steel. Ferrules vary in shape and material but are most commonly in the shape of a ring with beveled edges. To work properly, the ferrule must be oriented correctly, in the case of copper olives they are normally barrel shaped and this means they cannot be fitted incorrectly, but where this is not so, particularly in Hydraulic and high pressure applications, the ferrule is fitted such that the longest sloping face of the ferrule faces away from the nut. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Fitok_Tube_Fittings.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Fitok_Tube_Fittings.jpg/220px-Fitok_Tube_Fittings.jpg" decoding="async" width="220" height="111" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Fitok_Tube_Fittings.jpg/330px-Fitok_Tube_Fittings.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Fitok_Tube_Fittings.jpg/440px-Fitok_Tube_Fittings.jpg 2x" data-file-width="907" data-file-height="459" /></a><figcaption>Fitok tube fittings</figcaption></figure> <p>When the nut is tightened, the ferrule is compressed between the nut and the receiving fitting; causing both ends of barrel shaped copper olives to be clamped around the pipe when the middle of the ferrule bows away from the pipe, in the case of hydraulic style ferrules they currently have one end which is larger with a 45 degree chamfer which tapers away (from installation contact with the nut) and the small end generally has two internal biting edges, for applications demanding much higher pressure, that penetrate the outside diameter of the tube, the fittings must be tightened to guidelines as per DIN2353 as not to exceed the elastic limit of the steel ferrules, The result is that the ferrule seals the space between the pipe, nut, and receiving fitting, thereby forming a tight joint. The clamping support of the pipe by the force at the taper at both ends help prevent movement of the pipe in the fitting, but it is only the taper at the receiving fitting itself that needs to seal completely, since if it does seal (to both the pipe and the compression fitting) then no fluid can get to the nut threads or the taper at the nut end to result in any leaks. As a result some similar fittings can be made using an olive with only one taper (or a fixed cone sealed to the pipe) where the sealing at that taper prevents fluid from reaching the nut. </p><p>Larger sizes of compression fitting do not have a single nut to compress the ferrule but a flange with a ring of bolts that performs this task. The bolts have to be tightened evenly. </p><p>Thread sealants such as joint compound (<a href="/wiki/Pipe_dope" title="Pipe dope">pipe dope</a> or <a href="/wiki/Thread_seal_tape" title="Thread seal tape">thread seal tape</a> such as <a href="/wiki/PTFE" class="mw-redirect" title="PTFE">PTFE</a> tape) are unnecessary on compression fitting threads, as it is not the thread that seals the joint but rather the compression of the ferrule between the nut and pipe. However, a small amount of <a href="/wiki/Silicone_grease" title="Silicone grease">plumber's grease</a> or light oil applied to the threads will provide lubrication to help ensure a smooth, consistent tightening of the compression nut. </p><p>It is critical to avoid over-tightening the nut or else the integrity of the compression fitting will be compromised by the excessive force. If the nut is overtightened the ferrule will deform improperly causing the joint to fail. Indeed, overtightening is the most common cause of leaks in compression fittings. A good rule of thumb is to tighten the nut first by hand until it is too difficult to continue and then tighten the nut one half-turn more with the aid of a wrench; the actual amount varies with the size of the fitting, as a larger one requires less tightening. The fitting is then tested: if slight weeping is observed, the fitting is gradually tightened until the weeping stops. </p><p>The integrity of the compression fitting is determined by the ferrule, which is easily prone to damage. Thus care should be taken when handling and tightening the fitting, although if the ferrule is damaged it is easily replaced. </p> <div class="mw-heading mw-heading2"><h2 id="Types_of_fittings">Types of fittings</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Compression_fitting&action=edit&section=2" title="Edit section: Types of fittings"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are two types of compression fitting, standard (British type-A/non-manipulative) and <i>flare</i> fittings (British type-B/manipulative). Standard fittings require no modifications to the tubing. <a href="/wiki/Flare_fitting" title="Flare fitting">Flare fittings</a> require modification of the tubing with a special tool. Standard fittings are typically used for water, hydraulic, and compressed air connections, whereas flare fittings are used for gas and high pressure lines. </p><p>A standard fitting can be installed using an ordinary wrench to tighten the surrounding nut. To remove it, a specialized puller is often used to slide the nut and ferrule off the tube. If the ferrule is difficult to remove it can be weakened with a cut, care being taken to not nick the pipe while cutting. </p> <div class="mw-heading mw-heading2"><h2 id="Advantages">Advantages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Compression_fitting&action=edit&section=3" title="Edit section: Advantages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Compression fittings are popular because they do not require soldering, so they are comparatively quick and easy to use. They require no special tools or skills to operate. They work at higher pressures and with toxic gases. Compression fittings are especially useful in installations that may require occasional disassembly or partial removal for maintenance etc., since these connections can be broken and remade without affecting the integrity of the joint. They are also used in situations where a heat source, in particular a soldering torch, is prohibited, or where it is difficult to remove remains of water from inside the pipe which prevent the pipe heating up to allow soldering. </p> <div class="mw-heading mw-heading2"><h2 id="Disadvantages">Disadvantages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Compression_fitting&action=edit&section=4" title="Edit section: Disadvantages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Compression fittings are not as robust as soldered fittings. They are typically used in applications where the fitting will not be disturbed and not subjected to flexing or bending. A <a href="/wiki/Soldering#Pipe_soldering" title="Soldering">soldered joint</a> is highly tolerant of flexing and bending (such as when pipes knock or shake from sudden pressure changes e.g. caused by <a href="/wiki/Water_hammer" title="Water hammer">water hammer</a>). Compression fittings are much more sensitive to these type of dynamic stresses. They are also bulkier, and may be considered less aesthetically pleasing than a neatly soldered joint. Compression fittings work best when tightened once and not disturbed.<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Category:All_self-contradictory_articles" title="Category:All self-contradictory articles"><span title="This text contradicts material elsewhere on this page. (August 2021)">contradictory</span></a></i>]</sup> Some compression connectors may never be reused, such as a ferrule ring type. It can never be reused once they have been compressed. This connector is directly placed over the pipe and the nut is tightened compressing the ferrule between the pipe and the body of the fitting. Compression of this ferrule also results in deformation of the copper tubing. If a compression type connection needs to be redone, more often than not the compressed copper/ferrule would need to be cut off and a new ferrule is to be used on a clean non-compressed piece of pipe end. This is to assure a leak proof sound connection. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Compression_fitting&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/AN_thread" title="AN thread">AN thread</a></li> <li><a href="/wiki/Cutting_ring_fitting" title="Cutting ring fitting">Cutting ring fitting</a></li> <li><a href="/wiki/Flare_fitting" title="Flare fitting">Flare fitting</a></li> <li><a href="/wiki/JIC_fitting" title="JIC fitting">JIC fitting</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes_and_references">Notes and references</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Compression_fitting&action=edit&section=6" title="Edit section: Notes and references"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="Basics" class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.beswick.com/resources/the-basics-of-compression-fittings/">"The Basics of Compression Fittings"</a>. <i>Beswick Engineering</i><span class="reference-accessdate">. Retrieved <span class="nowrap">18 April</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Beswick+Engineering&rft.atitle=The+Basics+of+Compression+Fittings&rft_id=https%3A%2F%2Fwww.beswick.com%2Fresources%2Fthe-basics-of-compression-fittings%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACompression+fitting" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Compression_fitting&action=edit&section=7" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20200918080736/http://copperplumbing.org.uk/sites/default/files/content_attachments/jointing-compression.pdf">"Jointing Copper Tubes: Compression Joints"</a> <span class="cs1-format">(PDF)</span>. UK Copper Board. Archived from the original on 2020-09-18.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Jointing+Copper+Tubes%3A+Compression+Joints&rft.pub=UK+Copper+Board&rft_id=http%3A%2F%2Fcopperplumbing.org.uk%2Fsites%2Fdefault%2Ffiles%2Fcontent_attachments%2Fjointing-compression.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACompression+fitting" class="Z3988"></span><span class="cs1-maint citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_web" title="Template:Cite web">cite web</a>}}</code>: CS1 maint: unfit URL (<a href="/wiki/Category:CS1_maint:_unfit_URL" title="Category:CS1 maint: unfit URL">link</a>)</span></li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Compression_fitting&oldid=1225755505">https://en.wikipedia.org/w/index.php?title=Compression_fitting&oldid=1225755505</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Category</a>: <ul><li><a href="/wiki/Category:Plumbing" title="Category:Plumbing">Plumbing</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_matches_Wikidata" title="Category:Short description matches Wikidata">Short description matches Wikidata</a></li><li><a href="/wiki/Category:Articles_needing_additional_references_from_April_2013" title="Category:Articles needing additional references from April 2013">Articles needing additional references from April 2013</a></li><li><a href="/wiki/Category:All_articles_needing_additional_references" title="Category:All articles needing additional references">All articles needing additional references</a></li><li><a href="/wiki/Category:All_self-contradictory_articles" title="Category:All self-contradictory articles">All self-contradictory articles</a></li><li><a href="/wiki/Category:Self-contradictory_articles_from_August_2021" title="Category:Self-contradictory articles from August 2021">Self-contradictory articles from August 2021</a></li><li><a href="/wiki/Category:CS1_maint:_unfit_URL" title="Category:CS1 maint: unfit URL">CS1 maint: unfit URL</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 26 May 2024, at 14:14<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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