{"id":49183,"date":"2026-02-26T03:41:52","date_gmt":"2026-02-26T03:41:52","guid":{"rendered":"https:\/\/www.kdmsteel.com\/?p=49183"},"modified":"2026-03-07T10:31:13","modified_gmt":"2026-03-07T10:31:13","slug":"atmospheric-tank-vs-pressure-tank","status":"publish","type":"post","link":"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/","title":{"rendered":"Atmospheric Tank vs Pressure Tank: Detailed Comparison for Engineers"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Liquids in atmospheric tanks and pressure tanks are stored at very dissimilar operating conditions. Industrial purchasers and engineers must select the tank based on process requirements and safety codes. Incorrect selection increases lifecycle costs and downtime. This article compares the two tanks with respect to practical engineering requirements.<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u76ee\u6b21\u3092\u5207\u308a\u66ff\u3048\u308b\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u30c8\u30b0\u30eb<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#What_is_an_Atmospheric_Tank\" >What is an Atmospheric Tank?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#What_is_a_Pressure_Tank\" >What is a Pressure Tank?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Major_Differences_between_Atmospheric_Tank_and_Pressure_Tank\" >Major Differences between Atmospheric Tank and Pressure Tank<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#1_Operating_Pressure\" >1. Operating Pressure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#2_Design_and_Construction_Standards\" >2. Design and Construction Standards<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#3_Venting_vs_Sealing\" >3. Venting vs Sealing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#4_Material_and_Structural_Requirements\" >4. Material and Structural Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#5_Safety_and_Risk_Profile\" >5. Safety and Risk Profile<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#6_Installation_and_Support_Systems\" >6. Installation and Support Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#7_Shape_and_Structural_Form\" >7. Shape and Structural Form<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#8_Regulatory_and_Inspection_Requirements\" >8. Regulatory and Inspection Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#9_Cost_Considerations\" >9. Cost Considerations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#10_Typical_Uses_and_Applications\" >10. Typical Uses and Applications<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Atmospheric_Tank_vs_Pressure_Tank_%E2%80%93_Which_One_Is_Best\" >Atmospheric Tank vs Pressure Tank \u2013 Which One Is Best?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#FAQs\" >\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Can_an_atmospheric_tank_be_considered_a_pressure_vessel\" >Can an atmospheric tank be considered a pressure vessel?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#What_shapes_are_common_for_pressure_vessels\" >What shapes are common for pressure vessels?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Are_there_atmospheric_tanks_controlled\" >Are there atmospheric tanks controlled?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Can_an_atmospheric_tank_require_special_permits\" >Can an atmospheric tank require special permits?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Why_do_pressure_tanks_need_pressure_relief_devices\" >Why do pressure tanks need pressure relief devices?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Can_temperature_affect_pressure_inside_a_storage_tank\" >Can temperature affect pressure inside a storage tank?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#How_often_are_atmospheric_tanks_inspected\" >How often are atmospheric tanks inspected?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Can_all_the_tanks_that_are_not_within_the_pressure_vessel_category_be_used_safely_in_high-pressure_environments\" >Can all the tanks that are not within the pressure vessel category be used safely in high-pressure environments?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/#Get_Your_Customized_Tanks_by_KDM_Steel\" >Get Your Customized Tanks by KDM Steel<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_an_Atmospheric_Tank\"><\/span><b>What is an Atmospheric Tank?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49185\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-63.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-63.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-63-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-63-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-63-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">The liquids are held at atmospheric pressure in an<\/span><a href=\"https:\/\/www.sciencedirect.com\/topics\/engineering\/atmospheric-tanks\"> <span style=\"font-weight: 400;\">atmospheric tank<\/span><\/a><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\">It operates at or near atmospheric pressure, typically below 1 psi, and up to 2.5 psi when designed per API 650 Appendix F. <\/span><span style=\"font-weight: 400;\">Venting systems are applied by designers to avoid overpressure or temperature variations. Engineers use atmospheric tanks to store water, fuels, and <\/span><span style=\"font-weight: 400;\">chemicals that do not require pressurized storage.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_a_Pressure_Tank\"><\/span><b>What is a Pressure Tank?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49186\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-64.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-64.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-64-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-64-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-64-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Fluids are held in a pressure tank at much higher pressures than the atmospheric pressure. <\/span><span style=\"font-weight: 400;\">Under normal service conditions, it operates at pressures exceeding <\/span><span style=\"font-weight: 400;\">15<\/span><span style=\"font-weight: 400;\"> psi<\/span><span style=\"font-weight: 400;\">. Engineers provide pressure tanks with reinforced shells to safely manage the stresses that occur inside the tank. These tanks handle gases, steam, and volatile liquids in accordance with ASME pressure vessel codes.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Major_Differences_between_Atmospheric_Tank_and_Pressure_Tank\"><\/span><b>Major Differences between Atmospheric Tank and Pressure Tank<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49187\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/Untitled-design-2.png\" alt=\"\" width=\"1920\" height=\"1080\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/Untitled-design-2.png 1920w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/Untitled-design-2-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/Untitled-design-2-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/Untitled-design-2-1536x864.png 1536w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/Untitled-design-2-18x10.png 18w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Operating_Pressure\"><\/span><b>1. <\/b><b>Operating Pressure<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks are operated at near-ambient pressure, and the design pressure is kept below 1 psi. <\/span><span style=\"font-weight: 400;\">The shell is only stiffened to resist loads of hydrostatic heads.<\/span> <span style=\"font-weight: 400;\">The design codes do not have to put atmospheric tanks under high sustained internal pressure, since the tanks are designed to contain low-volatility liquids.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Pressure tanks operate at pressures above atmospheric and are assigned a Maximum Allowable Working Pressure (MAWP). Hoop and longitudinal stresses are caused by internal pressure and must be calculated based on shell thickness and joint efficiency. Codes make the tank be designed at a set of MAWP that is maintained at normal operation.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Design_and_Construction_Standards\"><\/span><b>2. <\/b><b>Design and Construction Standards<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks are designed in accordance with<\/span><a href=\"https:\/\/kdmfab.com\/api-650-tank\/\"><span style=\"font-weight: 400;\"> API 650<\/span><\/a><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\">The code assumes negligible internal pressure during normal operation. <\/span><span style=\"font-weight: 400;\">The calculations of the shell thickness are based on the specific gravity of the liquid and the fill height. The roof structures only cope with uplift caused by wind loads and thermal expansion. <\/span><span style=\"font-weight: 400;\">Stress calculations for wind and seismic loads are required, but internal pressure stress formulas are not applicable.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Pressure tanks are built according to the ASME Boiler and Pressure Vessel Code of construction. The main design load considered in the code is internal pressure. Allowable stress values and joint efficiency factors are used in the calculation of shell thickness. <\/span><span style=\"font-weight: 400;\">Fabrication requires qualified weld procedures and mandatory hydrostatic testing.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Venting_vs_Sealing\"><\/span><b>3. <\/b><b>Venting vs Sealing<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks are equipped with normal and emergency vents to prevent internal pressure from exceeding design limits. Emergency venting is considered fire input heat as indicated by API 2000. Blocked vents can cause roof uplift even at low differential pressure.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Pressure tanks have closed systems and relief valves that are not below MAWP. The relief devices open only on overpressure events that are beyond the design limits. ASME regulations mandate certified sizing of valves to prevent an increase in pressure in case of upset and fire conditions.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Material_and_Structural_Requirements\"><\/span><b>4. <\/b><b>Material and Structural Requirements<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Carbon steel plates with adequate yield strength (e.g., \u2265250 MPa) are commonly used.<\/span><span style=\"font-weight: 400;\"> Structural design is resistant to the hydrostatic head wind and seismic loads. The thickness of plates is augmented by increasing the height of the liquid and not the pressure stress calculations.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Pressure tanks are made of pressure-rated carbon or alloy steels with regulated tensile and impact characteristics. Choice of materials is based on permissible stress levels that are determined by design temperature. <\/span><span style=\"font-weight: 400;\">Shell thickness is determined by internal pressure, allowable stress, and joint efficiency. Hydrostatic head is a secondary consideration.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Safety_and_Risk_Profile\"><\/span><b>5. <\/b><b>Safety and Risk Profile<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Tanks in the atmosphere are less vulnerable to the aspect of internal pressure but more vulnerable to the release of vapors.<\/span> <span style=\"font-weight: 400;\">These are roof uplift, shell buckling, and rim seal fires.<\/span> <span style=\"font-weight: 400;\">Low operating pressure results in the design minimizing stored energy.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Due to their high operating pressures, pressure tanks store significant internal energy. Failure may involve rapid decomposition, fragmentation, and blasting. Codes demand the provision of safety factors, pressure relief systems, as well as regular examination to manage catastrophic rupture and risks of fatigue.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Installation_and_Support_Systems\"><\/span><b>6. <\/b><b>Installation and Support Systems<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks are supported on ringwall or slab foundations designed for hydrostatic loads.<\/span><span style=\"font-weight: 400;\"> The foundation design is determined by the large tank diameters through the use of the differential settlement limits. Wind girders are resistant to lateral wind forces, as internal pressure does not offer structural stiffening.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Pressure tanks are mounted on skirts, saddles, or lugs that are used to carry pressure thrust loads and thermal loads. The support systems withstand the seismic accelerations and axial pressure forces. Anchor bolts hold back uplift caused by internal pressure in normal and upset operating conditions.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Shape_and_Structural_Form\"><\/span><b>7. <\/b><b>Shape and Structural Form<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks consist of a large-diameter thin-wall cylindrical shell having flat cone or dome roofs. Height-limited designs are permitted by low internal pressure. The stability of shells is not based on the stress distribution of pressure but on the ratios between diameter and thickness and the hydrostatic head.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Pressure tanks use cylindrical or spherical geometry to efficiently contain internal pressure. Spherical shapes provide uniform stress distribution; cylindrical shells require dished heads to minimize stress concentrations at ends.<\/span><span style=\"font-weight: 400;\"> Dished heads eliminate stress concentration at shell junctions. With reduced diameter to thickness ratios, high internal pressure can be safely contained with a predictable deformation behavior.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Regulatory_and_Inspection_Requirements\"><\/span><b>8. <\/b><b>Regulatory and Inspection Requirements<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks are inspected in accordance with API 653. Inspections can be done on shell corrosion, floor thinning, and settlement. The internal inspections are done at a longer period since operating pressure is less than 1 psi, and the stored energy levels are low.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The inspection of the pressure tanks is <\/span><span style=\"font-weight: 400;\">in accordance with<\/span><a href=\"https:\/\/www.asme.org\/codes-standards\/bpvc-standards\"> <span style=\"font-weight: 400;\">ASME Boiler and Pressure Vessel Code<\/span><\/a> <span style=\"font-weight: 400;\">requirements and jurisdictional regulations.<\/span><span style=\"font-weight: 400;\"> The inspection covers pressure boundary assessment and testing of relief valves. <\/span><span style=\"font-weight: 400;\">Higher operating pressure requires shorter inspection intervals and more rigorous integrity assessments.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Cost_Considerations\"><\/span><b>9. <\/b><b>\u30b3\u30b9\u30c8\u306e\u8003\u616e<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks are cheaper because of low design pressure and finer thickness of the shell plates. The common thickness of plates is between 6 and 25 mm. It is welded without full radiography. Less frequent inspection minimizes the maintenance and compliance expenses in the long term.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The use of thicker shells that can be in excess of 30 mm at high pressure makes pressure tanks more expensive. High-grade materials and combined efficiency demands are other factors that make fabrication more complicated. The cost of radiography, hydrostatic testing, and relief systems is mandatory and increases the initial cost and long-term inspection costs.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Typical_Uses_and_Applications\"><\/span><b>10. Typical Uses and Applications<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Atmospheric Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks will help you in storing high quantities of low-volatile liquids like chemicals, crude oil, water, etc. Below 1 psi operating pressure. They are applicable in bulk storage with constant flow rates and no pressure containment.<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"> \u00a0 <\/span> <b>Pressure Tank:<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Engineers will find pressure tanks in those areas and processes that have pressure storage of gases, steam, and volatile liquids, where maximum control is needed. It is frequently operated under pressure of more than 15 psi. Moreover, it can be used as reactors and surge vessels, <\/span><span style=\"font-weight: 400;\">where pressure containment is required.<\/span><b>\u00a0<\/b><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Parameter<\/b><\/td>\n<td><b>Atmospheric Tank<\/b><\/td>\n<td><b>Pressure Tank<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Operating Pressure<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Near atmospheric (\u22641\u20132.5 psig)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Above 15 psig<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Governing Design Load<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Hydrostatic liquid head<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Internal pressure stress<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Design Code<\/span><\/td>\n<td><span style=\"font-weight: 400;\">API 650<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASME Section VIII<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Venting<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Open\/vented system<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Closed system with relief valves<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Shell Thickness Basis<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Liquid height &amp; specific gravity<\/span><\/td>\n<td><span style=\"font-weight: 400;\">MAWP &amp; allowable stress<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Structural Form<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Large-diameter, thin-wall<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Thick-wall cylindrical\/spherical<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Stored Energy<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Low<\/span><\/td>\n<td><span style=\"font-weight: 400;\">High<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Inspection Standard<\/span><\/td>\n<td><span style=\"font-weight: 400;\">API 653<\/span><\/td>\n<td><span style=\"font-weight: 400;\">API 510 \/ NBIC<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Fabrication Complexity<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Moderate<\/span><\/td>\n<td><span style=\"font-weight: 400;\">High (NDT &amp; hydrotest required)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Typical Service<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Bulk liquid storage<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gas\/volatile fluid containment<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Atmospheric_Tank_vs_Pressure_Tank_%E2%80%93_Which_One_Is_Best\"><\/span><b>Atmospheric Tank vs Pressure Tank \u2013 Which One Is Best?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49188\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-65.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-65.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-65-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-65-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-65-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">An atmospheric tank performs best when storage responsibility entails low volatility liquids and negligible internal pressure. These tanks are specifically developed to minimize pressure related to stress and minimize failure energy. High-volume storage using large-diameter construction has less complex fabrication requirements. They are widely used in applications in which venting control, corrosion allowance, and settlement tolerance are the factors controlling performance and not pressure containment.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The design of pressure tanks is made to secure the handling of stored energy through calculated shell thickness and relief systems. They allow a small design and high accuracy of control. They will be selected based on the margins of pressure duty, safety, and regulatory compliance requirements.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><b>\u3088\u304f\u3042\u308b\u8cea\u554f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Can_an_atmospheric_tank_be_considered_a_pressure_vessel\"><\/span><b>Can an atmospheric tank be considered a pressure vessel?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks are to be built at pressures limited to 1 psi, although they can be as high as 2.5 psi when built to API 650 Appendix F.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_shapes_are_common_for_pressure_vessels\"><\/span><b>What shapes are common for pressure vessels?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">You will mostly find pressure vessels in cylindrical shapes with dished ends or spherical ends. The reason for these shapes is evenly distributed internal pressure stresses.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Are_there_atmospheric_tanks_controlled\"><\/span><b>Are there atmospheric tanks controlled?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Yes. In API 650, atmospheric tanks are governed, and in API 653, inspected.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_an_atmospheric_tank_require_special_permits\"><\/span><b>Can an atmospheric tank require special permits?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Yes. Atmospheric tanks might need special permits, which depend upon the size, location, and type of liquid to be stored.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_do_pressure_tanks_need_pressure_relief_devices\"><\/span><b>Why do pressure tanks need pressure relief devices?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Relief devices will help you in preventing internal pressure from exceeding the MAWP during fire exposure.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_temperature_affect_pressure_inside_a_storage_tank\"><\/span><b>Can temperature affect pressure inside a storage tank?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Particularly in the closed pressure tanks, if you increase the temperature, the vapor pressure and internal pressure will increase.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_often_are_atmospheric_tanks_inspected\"><\/span><b>How often are atmospheric tanks inspected?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Atmospheric tanks should be inspected every 5 to 10 years. It totally depends on the rate of corrosion and service provisions.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_all_the_tanks_that_are_not_within_the_pressure_vessel_category_be_used_safely_in_high-pressure_environments\"><\/span><b>Can all the tanks that are not within the pressure vessel category be used safely in high-pressure environments?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u3044\u3044\u3048\u3002 <\/span><span style=\"font-weight: 400;\">The tanks, which are not able to withstand the pressure and which lack structural support, will fall down when the pressure exerted on them is more than the design limits.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Get_Your_Customized_Tanks_by_KDM_Steel\"><\/span><b>Get Your Customized Tanks by KDM Steel<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49189\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-66.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-66.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-66-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-66-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-66-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">KDM\u30b9\u30c1\u30fc\u30eb<\/span> <span style=\"font-weight: 400;\">designs and builds atmospheric and pressure tanks to the precise design codes and process standards. We provide solutions that are adherent to industrial requirements. We provide reliability in terms of performance and requirements in design review, fabrication, and delivery.<\/span><a href=\"https:\/\/www.kdmsteel.com\/ja\/\u63a5\u89e6\/\"> <span style=\"font-weight: 400;\">\u63a5\u89e6<\/span><\/a> <span style=\"font-weight: 400;\">\u79c1\u305f\u3061<\/span><span style=\"font-weight: 400;\"> and speak about your projects.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Liquids in atmospheric tanks and pressure tanks are stored at very dissimilar operating conditions. Industrial purchasers and engineers must select the tank based on process requirements and safety codes. Incorrect selection increases lifecycle costs and downtime. This article compares the two tanks with respect to practical engineering requirements. What is an Atmospheric Tank? The liquids [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":49184,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"disabled","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-49183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Atmospheric Tank vs Pressure Tank: Detailed Comparison for Engineers - KDM Steel<\/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:\/\/www.kdmsteel.com\/ja\/atmospheric-tank-vs-pressure-tank\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Atmospheric Tank vs Pressure Tank: Detailed Comparison for Engineers - KDM Steel\" \/>\n<meta property=\"og:description\" content=\"Liquids in atmospheric tanks and pressure tanks are stored at very dissimilar operating conditions. 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Industrial purchasers and engineers must select the tank based on process requirements and safety codes. Incorrect selection increases lifecycle costs and downtime. This article compares the two tanks with respect to practical engineering requirements. What is an Atmospheric Tank? 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