{"id":1396,"date":"2025-11-04T10:50:05","date_gmt":"2025-11-04T10:50:05","guid":{"rendered":"https:\/\/stvvalve.com\/?p=1396"},"modified":"2025-11-04T10:52:13","modified_gmt":"2025-11-04T10:52:13","slug":"api-standard-gate-valve-testing-procedure","status":"publish","type":"post","link":"https:\/\/stvvalve.com\/es\/api-standard-gate-valve-testing-procedure\/","title":{"rendered":"API Standard Gate Valve Testing Procedure"},"content":{"rendered":"<div dir=\"auto\" data-node=\"true\">API Standard Gate Valve Testing Procedure<\/div>\n<div class=\"ace-line heading-h2\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">1. Scope and Reference Standards<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">This procedure specifies the testing requirements, methods, and acceptance criteria for <\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">API\/ASME standard gate valves<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\"> (including ANSI Class 150~2500, NPS 1~48) used in oil and gas, petrochemical, power generation, and other industrial sectors. All tests shall comply with the following core standards:<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\"><a href=\"https:\/\/www.stvvalves.com\/api-598-valve-inspection-testing-standard-complete-guide\/\">API 598<\/a>: Valve Inspection and Testing<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">ASME B16.34: Valves\u2014Flanged, Threaded, and Welded End Connections<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">ANSI\/ASME B16.10: Face-to-Face and End-to-End Dimensions of Valves<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\"><a href=\"https:\/\/www.stvvalves.com\/china-api-600-cast-steel-gate-valve-review-for-2025-buyers\/?utm_source=chatgpt.com\">API 600<\/a>: Steel Gate Valves\u2014Flanged and Butt-Welding Ends, NPS 1 through 24<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h2\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">2. Pre-Test Preparation<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">2.1 Valve Preparation<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Visually inspect the valve body, bonnet, gate, stem, and sealing components for defects (e.g., cracks, scratches, corrosion) and ensure all parts are properly assembled per the manufacturing drawing.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Clean the valve internal cavity to remove debris, oil, or foreign particles that may affect test results.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Verify that the valve is fully open (for shell testing) and fully closed (for seat testing) during respective test phases.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Ensure gland packing or mechanical seals are properly installed with appropriate compression to prevent external leakage during testing.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">2.2 Test Equipment and Tools<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Hydrostatic test pump (with pressure gauge calibrated within the past 6 months, accuracy \u00b11.5% FS).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Pneumatic test equipment (for low-pressure air testing, if required) with pressure regulators and safety relief valves.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Test fixtures (flange adapters, blind flanges, clamping devices) compatible with the valve\u2019s end connections (flanged, threaded, or butt-welded).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Leakage measurement tools: graduated cylinders, bubble solution (for pneumatic testing), or electronic leak detectors.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Safety equipment: goggles, gloves, safety shoes, and pressure relief valves set to 1.25 times the test pressure.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">2.3 Test Medium<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Hydrostatic testing: Clean water (chloride content \u2264 25 ppm) or corrosion-inhibited water (for stainless steel valves to prevent pitting).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Pneumatic testing: Dry, oil-free compressed air or nitrogen (pressure \u2264 1.0 MPa) \u2014 only permitted if hydrostatic testing is not feasible (e.g., for lightweight or small-bore valves).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h2\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">3. Core Test Items and Procedures<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">3.1 Shell Test (Body Pressure Test)<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">Purpose<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">: Verify the structural integrity of the valve body, bonnet, and body-bonnet joint against internal pressure.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line ol-idaepuuDjY list-div list-start-number1\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"1\" data-origin-start=\"1\" data-start=\"1\">\n<li data-start=\"1\"><span data-leaf=\"true\"><span class=\"lb\">Close the valve gate partially (1\/4 open) to balance pressure inside the cavity, then install the valve in the test fixture and seal both ends.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line ol-id4sqYcEbF list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"2\" data-origin-start=\"2\" data-start=\"2\">\n<li data-start=\"2\"><span data-leaf=\"true\"><span class=\"lb\">Fill the valve cavity with the test medium, vent all air through the air release valve to avoid air pockets.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line ol-idrvd1RiVr list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"3\" data-origin-start=\"3\" data-start=\"3\">\n<li data-start=\"3\"><span data-leaf=\"true\"><span class=\"lb\">Gradually increase the pressure to <\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">1.5 times the valve\u2019s rated pressure (PN\/Class)<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">. For example:<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet2 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Class 150 (PN20) valve: Test pressure = 20 \u00d7 1.5 = 30 bar (435 psi)<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet2 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Class 600 (PN100) valve: Test pressure = 100 \u00d7 1.5 = 150 bar (2175 psi)<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line ol-idHCgQCuRQ list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"4\" data-origin-start=\"4\" data-start=\"4\">\n<li data-start=\"4\"><span data-leaf=\"true\"><span class=\"lb\">Maintain the test pressure for the specified duration (per API 598):<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\">\n<div class=\"ace-table-wrapper-outer\" contenteditable=\"false\">\n<p><span data-zero-space=\"true\">\u200b<\/span><\/p>\n<div class=\"ace-table-wrapper\">\n<div class=\"ace-table-wrapper-inner tb-scrollable\">\n<div class=\"tb-scrollable-content\">\n<div class=\"tb-scrollable-children\">\n<table class=\"ace-table\" style=\"height: 488px;\" width=\"670\" data-ace-table-col-widths=\"200;200\">\n<colgroup>\n<col width=\"200\" \/>\n<col width=\"200\" \/><\/colgroup>\n<tbody>\n<tr class=\"ace-table-row\">\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r0xeifkv5z0krkeuyasmq9yc0\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r0xeifkv5z0krkeuyasmq9yc0 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r0xeifkv5z0krkeuyasmq9yc0\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">Valve Size (NPS)<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r0xeifkv5z0krkeuyasmq9yc1\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r0xeifkv5z0krkeuyasmq9yc1 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r0xeifkv5z0krkeuyasmq9yc1\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">Test Duration (Minutes)<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<tr class=\"ace-table-row\">\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r1xeifkv5z0krkeuyasmq9yc0\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r1xeifkv5z0krkeuyasmq9yc0 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r1xeifkv5z0krkeuyasmq9yc0\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">\u2264 2<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r1xeifkv5z0krkeuyasmq9yc1\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r1xeifkv5z0krkeuyasmq9yc1 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r1xeifkv5z0krkeuyasmq9yc1\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">5<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<tr class=\"ace-table-row\">\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r2xeifkv5z0krkeuyasmq9yc0\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r2xeifkv5z0krkeuyasmq9yc0 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r2xeifkv5z0krkeuyasmq9yc0\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">2.5 ~ 8<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r2xeifkv5z0krkeuyasmq9yc1\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r2xeifkv5z0krkeuyasmq9yc1 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r2xeifkv5z0krkeuyasmq9yc1\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">10<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<tr class=\"ace-table-row\">\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r3xeifkv5z0krkeuyasmq9yc0\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r3xeifkv5z0krkeuyasmq9yc0 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r3xeifkv5z0krkeuyasmq9yc0\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">\u2265 10<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<td class=\"ace-table-cell tb-resizable\" contenteditable=\"true\">\n<div class=\"separate-td-content-editable\" contenteditable=\"false\">\n<div class=\"inner-zone-ace-editor-wrapper\" contenteditable=\"false\" data-ace-inner-zone-content-wrapper-zone-id=\"xkekkdlqpdjqlannzfm4r3xeifkv5z0krkeuyasmq9yc1\">\n<div class=\"zone-container zoneId-xkekkdlqpdjqlannzfm4r3xeifkv5z0krkeuyasmq9yc1 ace-editor\" data-zone-id=\"xkekkdlqpdjqlannzfm4r3xeifkv5z0krkeuyasmq9yc1\" data-zone-container=\"*\" data-slate-editor=\"true\">\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-string=\"true\" data-leaf=\"true\">15<\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ep-ranges ignore-dom\"><\/div>\n<div class=\"ep-cursors ignore-dom\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-horz\"><\/div>\n<div class=\"ignore-dom tb-resizable-grippy tb-resizable-vert\">\n<div class=\"tb-resizable-grippy-inner\"><\/div>\n<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"tb-scrollable-shadow tb-scrollable-shadow-left juice-ignore-node-class ignore-dom\"><\/div>\n<div class=\"tb-scrollable-shadow tb-scrollable-shadow-right juice-ignore-node-class ignore-dom\"><\/div>\n<div class=\"ignore-dom\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/p>\n<\/div>\n<div class=\"ace-line ol-idtmJ5YVGX list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"5\" data-origin-start=\"5\" data-start=\"5\">\n<li data-start=\"5\"><span data-leaf=\"true\"><span class=\"lb\">Inspection criteria: No visible leakage, permanent deformation, or sweating at the body, bonnet, flanges, or body-bonnet gasket joint.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">3.2 Seat Leakage Test (Closure Test)<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">Purpose<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">: Verify the sealing performance of the gate and seat (both upstream and downstream).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line heading-h4\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">3.2.1 Hydrostatic Seat Test<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line ol-idLMpaQihG list-div list-start-number1\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"1\" data-origin-start=\"1\" data-start=\"1\">\n<li data-start=\"1\"><span data-leaf=\"true\"><span class=\"lb\">Fully close the valve gate and ensure the stem is properly seated. Seal one end of the valve and connect the test pump to the other end.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line ol-idD8P9lYGr list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"2\" data-origin-start=\"2\" data-start=\"2\">\n<li data-start=\"2\"><span data-leaf=\"true\"><span class=\"lb\">Fill the cavity with the test medium, vent air, and increase pressure to <\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">1.1 times the rated pressure<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line ol-idkQyGr8kx list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"3\" data-origin-start=\"3\" data-start=\"3\">\n<li data-start=\"3\"><span data-leaf=\"true\"><span class=\"lb\">Maintain pressure for 5~10 minutes (per valve size, same as shell test duration).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line ol-id9nfoq6DU list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"4\" data-origin-start=\"4\" data-start=\"4\">\n<li data-start=\"4\"><span data-leaf=\"true\"><span class=\"lb\">Check for leakage from the opposite end (unpressurized side) and the stem packing:<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet2 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">For metal-seated valves (API 600): Permissible leakage \u2264 0.1 cm\u00b3\/min per inch of valve nominal diameter (NPS).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet2 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">For soft-seated valves (e.g., PTFE seats): Zero visible leakage (no drops or continuous flow).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line ol-idAZFg8mWO list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"5\" data-origin-start=\"5\" data-start=\"5\">\n<li data-start=\"5\"><span data-leaf=\"true\"><span class=\"lb\">Repeat the test for the opposite seat (reverse flow direction) to ensure bidirectional sealing.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line heading-h4\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">3.2.2 Pneumatic Seat Test (Alternative)<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line ol-idSMfGBJLc list-div list-start-number1\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"1\" data-origin-start=\"1\" data-start=\"1\">\n<li data-start=\"1\"><span data-leaf=\"true\"><span class=\"lb\">Use dry air or nitrogen as the test medium. Pressurize the valve cavity to <\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">0.3~0.6 MPa (43~87 psi)<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line ol-id0O4GT8Bb list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"2\" data-origin-start=\"2\" data-start=\"2\">\n<li data-start=\"2\"><span data-leaf=\"true\"><span class=\"lb\">Apply bubble solution to the unpressurized end and stem packing.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line ol-idhyCBTNrn list-div\" dir=\"auto\" data-node=\"true\">\n<ol class=\"list-number1 r-list r-list-number\" start=\"3\" data-origin-start=\"3\" data-start=\"3\">\n<li data-start=\"3\"><span data-leaf=\"true\"><span class=\"lb\">Acceptance criteria: No continuous bubbles (maximum 1 bubble per minute is permissible for metal seats; zero bubbles for soft seats).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ol>\n<\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">3.3 Stem Seal (Packing) Test<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">Purpose<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">: Verify the sealing performance of the gland packing or mechanical seal.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Conduct this test simultaneously with the seat test: During the seat pressure holding phase, inspect the stem packing area for external leakage.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Acceptance criteria: No visible leakage (dripping or spraying) \u2014 minor seepage that evaporates immediately is permissible for metal packing; zero leakage for mechanical seals.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">3.4 Operation Test<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">Purpose<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">: Ensure smooth opening and closing of the valve without jamming.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">After pressure tests, release all pressure and drain the test medium.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Operate the valve stem (manual, gear, or actuator-driven) through full open and full closed positions 3~5 times.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Check for:<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet2 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Smooth movement without excessive force (torque shall comply with API 600 requirements).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet2 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Correct alignment of the gate with the seats.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet2 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Proper indication of open\/closed positions (if equipped with position indicators).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h2\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">4. Acceptance Criteria and Defect Handling<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">4.1 Qualification Requirements<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">All tests must meet the leakage limits and performance requirements specified in API 598 and the valve\u2019s design specification.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">No structural damage (cracks, deformation) or permanent leakage after testing.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Operation torque shall not exceed 120% of the rated torque (for actuator-mounted valves).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h3\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">4.2 Defect Handling<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">If leakage exceeds the permissible limit: Disassemble the valve, inspect the sealing surfaces (seat, gate) for damage, rework or replace defective components, and retest.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">If structural deformation is detected: Reject the valve and initiate a root cause analysis (RCA) per quality management procedures.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Retesting: Failed valves must undergo full retesting (shell + seat + operation) after repair, not just the failed item.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h2\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">5. Test Documentation and Reporting<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">After completing all tests, prepare a <\/span><\/span><span data-leaf=\"true\"><span class=\"lb\">Valve Test Report<\/span><\/span><span data-leaf=\"true\"><span class=\"lb\"> (VTR) containing the following information:<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Valve identification: Model, serial number, NPS, Class\/PN, material grade (body, trim), manufacturing date.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Test parameters: Test medium, test pressure, holding time, ambient temperature.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Test results: Leakage volume (if measured), observations of each test phase, operation torque values.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Certification: Signature of the test operator, quality inspector, and date of testing.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Attachments: Calibration certificates of test equipment, material test reports (MTRs) of key components, and CE\/API certification (if applicable).<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line heading-h2\" dir=\"auto\" data-node=\"true\"><span data-leaf=\"true\"><span class=\"lb\">6. Safety Precautions<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">All test personnel must wear personal protective equipment (PPE) during testing.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Ensure the test area is well-ventilated (especially for pneumatic testing) and free of flammable or explosive materials.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Never exceed the maximum test pressure specified in the procedure \u2014 safety relief valves must be functional and properly set.<\/span><\/span><span data-string=\"true\" data-enter=\"true\" data-leaf=\"true\">\u200b<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"ace-line list-div\" dir=\"auto\" data-node=\"true\">\n<ul class=\"list-bullet1 r-list r-list-bullet\">\n<li><span data-leaf=\"true\"><span class=\"lb\">Relieve pressure gradually after testing; do not open the vent valve suddenly to avoid water hammer or pressure surges.<\/span><\/span><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>API Standard Gate Valve Testing Procedure 1. Scope and Reference Standards\u200b This procedure specifies the testing requirements, methods, and acceptance criteria for API\/ASME standard gate valves (including ANSI Class 150~2500, NPS 1~48) used in oil and gas, petrochemical, power generation, and other industrial sectors. All tests shall comply with the following core standards:\u200b API 598: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[15,14],"tags":[412],"class_list":["post-1396","post","type-post","status-publish","format-standard","hentry","category-industry-valve-news","category-news","tag-api-standard-gate-valve-testing-procedure"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>API Standard Gate Valve Testing Procedure - China Industry Valves Supplier &amp; 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