{"id":803,"date":"2024-07-06T01:00:00","date_gmt":"2024-07-05T19:30:00","guid":{"rendered":"https:\/\/ehs-hub.contentstudioo.com\/?p=803"},"modified":"2025-01-11T10:26:06","modified_gmt":"2025-01-11T04:56:06","slug":"pressure-relief-devices","status":"publish","type":"post","link":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/2024\/07\/06\/pressure-relief-devices\/","title":{"rendered":"Pressure Relief Devices"},"content":{"rendered":"\n
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\u2022 If pressure inside a tank rises due to any reason, it may burst the tank from its weakest part or cause leakage from where it is possible.<\/p>\n\n\n\n

\u2022 The content thus coming out is a material loss and in addition, it may create fire, explosion or toxic hazard.<\/p>\n\n\n\n

\u2022 Therefore to avoid such situation, pressure relief devices are necessary.<\/p>\n\n\n\n

\u2022 A \u2018Safety Valve\u2019 is a common pressure relief device.<\/p>\n\n\n\n

\u2022 It can be set to a desired pressure and when pressure exerted on it exceeds the pre-set value, it automatically opens and allows the pressure to release in atmosphere or in a catch pot or drowning tank if the content coming out is hazardous or hot.<\/p>\n\n\n\n

\u2022 It automatically closes down also after release of excessive pressure.<\/p>\n\n\n\n

\u2022Safety valves are used to release gas or vapor but not liquid.<\/p>\n\n\n\n

\u2022 A \u2018Rupture disc\u2019 is required for the fast release or more flow from a bigger size hole or if internal pressure is too high or too rapid or the material is sticky and chokes the safety valve.<\/p>\n\n\n\n

\u2022 This disc is selected based on many parameters (like type of chemical, W.P, temp, reaction, viscosity, corrosivity, toxicity etc.)<\/p>\n\n\n\n

\u2022 One disc can be used for one pressure i.e\u00a0 its set pressure can not be changed like safety valve, and after rupture the same disc can not be re used.<\/p>\n\n\n\n

\u2022 Once opened, it can not reset at the lowered pressure like safety valve and will allow the whole mass to come out till the hole is closed or disc is replaced.<\/p>\n\n\n\n

\u2022 This is its disadvantage.<\/p>\n\n\n\n

\u2022 Therefore, it is inadvisable on tanks containing flammable gases or liquids.<\/p>\n\n\n\n

\u2022 Rupture disc can be used in conjunction with safety or relief valve.<\/p>\n\n\n\n

\u2022 Then the disc will burst first without affecting the valve.<\/p>\n\n\n\n

\u2022 Pressure gauge is to be provided between the disc and the valve to indicate that the disc has opened and what is the bursting pressure.<\/p>\n\n\n\n

\u2022 The rupture disc is used to release gas, vapor or liquid.<\/p>\n\n\n\n

\u2022 \u2018Relief Valves\u2019 do not full open at set pressure like safety valve but open slightly and then further as the\u00a0 pressure increases.<\/p>\n\n\n\n

\u2022 Relief valves are used for liquid discharge and not for gas or vapors.<\/p>\n\n\n\n

\u2022 \u2018Safety relief valves\u2019 can be used either as a safety valve or relief valve, depending upon the application,.<\/p>\n\n\n\n

\u2022 They are used for gases, vapor and liquid.<\/p>\n\n\n\n

\u2022 \u2018Fusible Plug\u2019 is a fitting filled with an alloy that melts at a predetermined temperature (not pressure) and gives way to the materials to come out.<\/p>\n\n\n\n

\u2022 Fusible plugs are used in boilers, domestic pressure cookers and compressed gas cylinders to prevent violent bursting.<\/p>\n\n\n\n

\u2022 They are used for gas, vapor and liquids of high temperature.<\/p>\n\n\n\n

\u2022 \u2018Vacuum Breaker\u2019 is also a type of pressure relief device and works like a spring loaded safety or relief valve but in reverse direction.<\/p>\n\n\n\n

\u2022 The outside atmospheric air pressure being higher than that inside the vessel, opens it to break the vacuum.<\/p>\n\n\n\n

\u2022 This is required when the vacuum may increase to collapse the vessel.<\/p>\n\n\n\n

\u2022 This device is used for air only.<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

A \u2018Safety Valve\u2019 is a common pressure relief device<\/p>\n","protected":false},"author":2,"featured_media":805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129],"tags":[12,21,13,8,19,321,323,3,322],"class_list":["post-803","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-safety-blog","tag-accident","tag-gujaratsafetycouncil","tag-industrial-accident","tag-industrial-safety","tag-post-diploma-in-industrial-safety","tag-pressure-relief-device","tag-rupture-disk","tag-safety","tag-safety-valve"],"_links":{"self":[{"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/posts\/803","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/comments?post=803"}],"version-history":[{"count":1,"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/posts\/803\/revisions"}],"predecessor-version":[{"id":807,"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/posts\/803\/revisions\/807"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/media\/805"}],"wp:attachment":[{"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/media?parent=803"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/categories?post=803"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ehs-hub.contentstudioo.com\/index.php\/wp-json\/wp\/v2\/tags?post=803"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}