{"id":42424,"date":"2020-02-04T05:00:00","date_gmt":"2020-02-04T05:00:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/10-places-to-check-for-gc-gas-leaks\/"},"modified":"2026-01-28T17:07:35","modified_gmt":"2026-01-28T17:07:35","slug":"10-places-to-check-for-gc-gas-leaks","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/zh-hans\/videos\/gnav3555\/10-places-to-check-for-gc-gas-leaks","title":{"rendered":"10 Places to Check for GC Gas Leaks"},"content":{"rendered":"\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"10 Places to Check for GC Gas Leaks\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/C9uhtt9le4U?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Description&nbsp;<\/h2>\n\n\n\n<p>Gas leaks are the bane of every gas chromatographer\u2019s existence. Even the smallest leak can cause a loss in sensitivity, contaminate samples, damage columns and instruments, and lead to a lot of wasted time.&nbsp;So grab your electronic leak detector and join us as we explore 10 places to check for&nbsp;leaks to&nbsp;help&nbsp;keep your&nbsp;gas chromatograph&nbsp;in tip-top condition!<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Additional Resources<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.restek.com\/articles\/leak-checking-a-GC-system\/\" target=\"_blank\" rel=\"noopener\">Leak Checking a GC System<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.restek.com\/articles\/how-much-sensitivity-is-needed-in-a-leak-detector\/\" target=\"_blank\" rel=\"noopener\">How Much Sensitivity is Needed in A Leak Detector?<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Restek Recommended Tools &amp; Parts<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.restek.com\/p\/28500\" target=\"_blank\" rel=\"noopener\">Restek Electronic Leak Detector<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Transcript&nbsp;<\/h2>\n\n\n\n<p>Gas leaks are the bane of every gas chromatographer\u2019s existence. Even the smallest leak can cause a loss in sensitivity, contaminate samples, damage columns and instruments, and lead to a lot of wasted time.&nbsp;&nbsp;<\/p>\n\n\n\n<p>In this Restek Tip, we\u2019re going to explore 10&nbsp;places&nbsp;you&nbsp;must&nbsp;check for&nbsp;leaks to keep your GC in tip-top condition. Let\u2019s get started!&nbsp;&nbsp;<\/p>\n\n\n\n<p>Prior to leak checking a GC, we recommend you increase system pressure while the GC is cool to accentuate any potential leaks, making them easier to detect.&nbsp;You will also need a leak detector.&nbsp;Today we\u2019ll be enlisting the help of Restek\u2019s&nbsp;electronic&nbsp;leak&nbsp;detector. These tools are huge time savers and are very effective in helping you troubleshoot and maintain your gas chromatograph.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Now that we\u2019re ready, let\u2019s hunt down those leaks!&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Gas Supply&nbsp;<\/h3>\n\n\n\n<p>Sometimes the leak isn\u2019t immediately near your GC. Always check your&nbsp;cylinders,&nbsp;generators, and&nbsp;manifolds. Each of these should be the first place you check when you suspect a leak. Pay special attention after installing new gas cylinders, particularly around the regulator.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Gas Filter Connections&nbsp;<\/h3>\n\n\n\n<p>Check for leaks any time you install new or replacement gas filters. If one of your gas filter compression fittings&nbsp;are&nbsp;leaking, check the fitting to make sure it is in good condition. Then tighten it appropriately.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Shutoff Valves&nbsp;<\/h3>\n\n\n\n<p>Moving parts can be more prone to leaking as they age and wear, so be sure to check the shutoff valves. A replacement may be necessary if you find a leak.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The EPC Connection&nbsp;<\/h3>\n\n\n\n<p>All gases enter the GC through the EPC so it\u2019s a critical spot to check for leaks. If you find a leak, ensure all the connections into the GC are clean and secure.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Split Vent Trap&nbsp;<\/h3>\n\n\n\n<p>Often overlooked during routine maintenance, the split vent trap could&nbsp;easily&nbsp;be the source of your leak. Be sure to check that the fittings are nice and snug. A replacement might be necessary&nbsp;if the leak is still present.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Septum Nut&nbsp;<\/h3>\n\n\n\n<p>Another common source of leaks is the septum. If the septum is leaking, first attempt to tighten the septum nut, but only to finger tight. If the nut is not the source, try the septum; it may need to be replaced.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The&nbsp;Weldment and the&nbsp;Weldment&nbsp;Lines&nbsp;<\/h3>\n\n\n\n<p>Check the weldment for leaks. If you detect a leak, it may be the result of an incorrectly tightened weldment, if so, retighten it. If a leak is still present, or detected around the weldment lines, it could indicate the presence of cracks. In this situation, the weldment should be replaced.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Reducing Nuts&nbsp;<\/h3>\n\n\n\n<p>Temperature cycling can loosen nuts if they are not properly tightened. If a leak is found, simply&nbsp;retighten the nut.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Inlet and Detector Column Nuts&nbsp;<\/h3>\n\n\n\n<p>Be sure to check the&nbsp;column&nbsp;nuts and fully tighten them if there is a leak. A damaged ferrule could also be the source of the leak and might need to be replaced.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Column Connectors&nbsp;<\/h3>\n\n\n\n<p>Don\u2019t forget the column! Column connectors are common sources for leaks, even if they are leak-free after initial installation. Check them regularly during use, reinstallation may be necessary if you discover a leak.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Even if a leak is not detected at any of these spots, it is good practice to inspect and leak check your gas lines and instrument daily, paying close attention to critical seals.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Experiencing other problems with your GC?&nbsp;Visit&nbsp;Restek.com&nbsp;for more&nbsp;troubleshooting tips.&nbsp;Like and subscribe for more helpful&nbsp;content, and&nbsp;thank you for joining us for&nbsp;this Restek Tip!<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Gas leaks are the bane of every gas chromatographer\u2019s existence. Even the smallest leak can cause a loss in sensitivity, contaminate samples, damage columns and instruments, and lead to a lot of wasted time. So grab your electronic leak detector and join us as we explore 10 places to check for leaks to help keep your gas chromatograph in tip-top condition!<\/p>\n","protected":false},"author":11,"featured_media":41004,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"default","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[8],"tags":[],"industries-application":[],"post-badge":[],"resource-type":[],"product-library":[2385,2372,2384,2386,2387,2389],"resource-technique":[2294,2295],"ppma_author":[414],"class_list":["post-42424","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-videos","product-library-ferrules-fittings-connectors","product-library-gas-chromatography-products","product-library-gc-columns","product-library-inlet-supplies","product-library-instrument-supplies-tools","product-library-tubing-regulators","resource-technique-gas-chromatography-gc","resource-technique-gcxgc"],"acf":[],"taxonomy_info":{"category":[{"value":8,"label":"Videos"}],"product-library":[{"value":2385,"label":"Ferrules, Fittings, Connectors"},{"value":2372,"label":"Gas Chromatography Products"},{"value":2384,"label":"GC Columns"},{"value":2386,"label":"Inlet Supplies"},{"value":2387,"label":"Instrument Supplies &amp; 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