{"id":6229,"date":"2026-09-21T08:25:25","date_gmt":"2026-09-21T05:25:25","guid":{"rendered":"https:\/\/aesinn.com\/test-ve-olcum-hizmetleri\/asme-pcc-1-basincli-civatali-flansli-baglantilarin-dogru-montaji-kilavuzu\/"},"modified":"2026-09-21T10:58:08","modified_gmt":"2026-09-21T07:58:08","slug":"asme-pcc-1-basincli-civatali-flansli-baglantilarin-dogru-montaji-kilavuzu","status":"publish","type":"page","link":"https:\/\/aesinn.com\/en\/test-ve-olcum-hizmetleri\/asme-pcc-1-basincli-civatali-flansli-baglantilarin-dogru-montaji-kilavuzu\/","title":{"rendered":"ASME PCC-1: Guide to Correct Installation of Pressure Bolted Flanged Fittings"},"content":{"rendered":"<h2 class=\"wp-block-heading\">What is ASME PCC-1 and what does it cover?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ASME PCC-1 (Guidelines for Pressure Boundary Bolted Flange Joint Assembly) is a guideline document for the correct assembly of bolted flange joints forming a pressure boundary. Its purpose is to ensure that the selection and practices during assembly guarantee the leak-tight nature of the joint. The guideline compiles best practice recommendations for flange joints with ring-type gaskets located within the bolt hole circle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This document is not a mandatory design code, but a compilation of accumulated assembly best practices in the industry. The user creates an effective assembly procedure by selecting the features appropriate to their service conditions. Its scope is concentrated on three main axes: gasket selection, bolt preload, and controlled tightening; it also includes troubleshooting guidance for non-sealed connections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This content is for educational and informational purposes only; a technical assessment by a qualified engineer is required for a decision on its application to a specific project.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Scope: Assembly quality of flanged connections with pressure limit bolts.<\/li>\n\n\n<li>Focus: gasket selection, bolt preload, and controlled tightening.<\/li>\n\n\n<li>Objective: Preventing leaks caused by assembly.<\/li>\n\n\n<li>Nature: not mandatory design code, but a guideline of good practice.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">PCC-1 vs. PCC-2 and the difference between design\/periodic testing.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ASME PCC-1 is often confused with ASME PCC-2; however, they are different documents. PCC-2 focuses on the repair of pressure equipment, while PCC-1 focuses on the correct assembly of a new or remanufactured flanged connection. This page addresses assembly quality under PCC-1 only.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Furthermore, assembly quality, design, and periodic inspection are separate issues. Pressure vessel design (EN 13445) and periodic testing are covered in separate pages; this page focuses on the correct assembly of the flange connection. That is, how to select and tighten the gasket and bolt is covered here; shell thickness calculation or periodic inspections during operation are the subject of other disciplines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There is also an important distinction: PCC-1 deals with the assembly of a bolted connection, not a welded connection. Since a flange connection is achieved with bolts and gaskets, the quality depends on assembly variables such as torque and preload.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>PCC-1: assembly quality (bolted connection)<\/li>\n\n\n<li>PCC-2: Repair of pressure equipment (separate document)<\/li>\n\n\n<li>EN 13445 \/ Pressure vessel design: separate topic, separate page<\/li>\n\n\n<li>Periodic testing and static equipment inspection: a separate discipline.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Installer qualifications: Appendix A<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The training and qualifications of personnel performing bolted joint assembly under PCC-1 are addressed in a separate Appendix A. This appendix provides guidance on uniform criteria for training and documenting the qualifications of assembly personnel, referred to as bolted joint assemblers, as well as guidance on program quality control.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The approach is based on a gradual progression of competence, from basic component identification to the ability to develop procedures. The assembler is expected to correctly identify flanges, bolts, gaskets, and lubricants; and to be able to apply tightening sequences, tool calibration, and controlled loading methods. Pre-assembly, in-assembly, and post-assembly quality assurance steps are also defined within this framework.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The suitability of the qualification assessment is determined by a technical evaluation by an authorized engineer based on service conditions and connection criticality.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Appendix A: Training and qualifications of assembly personnel<\/li>\n\n\n<li>Gradual competence: from component identification to procedure development<\/li>\n\n\n<li>Material identification: flange, bolt, gasket, lubricant<\/li>\n\n\n<li>Quality assurance steps before\/during\/after assembly<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Bolt tightening methods and the concept of preload.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The primary factor determining the tightness of the connection is the stress on the gasket, i.e., the achieved bolt preload. The PCC-1 addresses two main approaches to controlling this load: torque-controlled tightening and bolt tensioning. Torque application is practical and easy to measure; however, torque only indirectly controls the stress on the gasket.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The same torque value can produce very different seal loads due to factors such as thread condition, lubrication, bolt length, flange alignment, and operator technique. Therefore, this guide uses the concept of target torque as a conceptual reference and recommends applying the load gradually. No numerical torque or pressure value is given here; the appropriate value should be calculated according to the flange class, seal type, and service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The bolt tensioning method applies load by directly extending the bolt and can provide a more repeatable preload under certain conditions. The choice of method depends on the characteristics of the connection.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>The seal is determined by: the actual preload on the gasket.<\/li>\n\n\n<li>Torque-controlled tightening: practical but indirect control.<\/li>\n\n\n<li>Bolt tensioning: loading by direct extension.<\/li>\n\n\n<li>Target torque is conceptual; the numerical value is calculated based on service specifications.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Sequential cross clamping arrangement and multi-pass application.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The order in which the bolts are tightened and the number of passes are crucial for the even distribution of the achieved sealing load. PCC-1 recommends a sequential cross-tightening pattern (cross-pattern, star pattern) in a multi-pass configuration. In the classic approach, the target torque is approached gradually over several passes: first to a low ratio, then to an intermediate ratio, and finally to the target value.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This classic cross-pattern is referred to as the legacy method in the guide; PCC-1 also addresses alternative sequencing arrangements that require fewer passes under certain conditions. The aim in both cases is to avoid compressing the seal on one side and leaving it loose on the other.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A common mistake is tightening bolts in a circular pattern, i.e., without using a cross pattern. In such a practice, bolts tightened early can lose a significant portion of their preload as adjacent bolts are tightened; this interaction is known as cross-talk and can lead to immediate leakage of the joint under pressure.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Sequential cross-tightening (star pattern), multi-pass application.<\/li>\n\n\n<li>Gradual loading: from a low rate to the target value.<\/li>\n\n\n<li>Legacy method and alternative sorting orders<\/li>\n\n\n<li>Circular clamping \u2192 cross-talk \u2192 preload loss<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Root causes of flange joint leakage.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In industry, the majority of flange joint leaks are due to assembly-related reasons, not design flanges. The most common are: insufficient or excessive bolt load, skipped passes, incorrect tightening sequence, faulty gasket selection or gasket placement errors, defects in the flange surface, and general assembly errors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Insufficient bolt load can prevent the gasket from being adequately compressed; excessive load can damage the gasket by crushing it or pushing the bolt close to its yield limit. Incorrect tightening sequence and uneven load distribution create leakage by generating high stress on one side of the gasket and low stress on the other. Therefore, root cause analysis usually focuses on assembly variables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The benefit of PCC-1 lies precisely here: by disciplining seal selection, tightening sequence, tool calibration, and controlled loading steps, it reduces the likelihood of assembly-related leaks. Identifying the root cause and selecting corrective actions in a specific connection requires a qualified engineer&#039;s technical assessment.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Insufficient or excessive bolt load<\/li>\n\n\n<li>Skipped pass and incorrect tightening sequence<\/li>\n\n\n<li>Gasket selection or installation error<\/li>\n\n\n<li>Flange surface defects and general assembly errors.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">AES&#039;s location and accreditation scope<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This page is intended to provide conceptual and objective information on ASME PCC-1; the content is for educational and informational purposes only. The decision to apply it to a specific project, connection, or procedure should be made after a qualified engineer&#039;s technical assessment, taking into account the relevant service conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AES is NOT a certification or accredited body; flange fitter and personnel certification is the responsibility of separate accredited organizations. AES&#039;s T\u00dcRKAK accreditation is limited only to the 6.1 Electrical Installation area, and this page does not claim any authority beyond this limit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In short, this content provides a general framework for the correct assembly quality of bolted-flange connections, rather than pressure vessel design or periodic testing.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>This content is for informational purposes only.<\/li>\n\n\n<li>AES is not a certification or accredited body.<\/li>\n\n\n<li>Personnel\/installer certification is the responsibility of separate accredited organizations.<\/li>\n\n\n<li>AES accreditation is limited to 6.1 Electrical Installations.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Related Services<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><a href=\"https:\/\/aesinn.com\/en\/muayene-periyodik-kontrol\/mekanik-ekipman-muayeneleri\/basincli-kaplar-ve-tesisatlar-periyodik-testleri\/\">Periodic Testing of Pressure Vessels and Installations<\/a><\/li>\n\n\n<li><a href=\"https:\/\/aesinn.com\/en\/muayene-periyodik-kontrol\/mekanik-ekipman-muayeneleri\/en-13445-ve-en-13480-basincli-kap-ve-endustriyel-boru-icin-avrupa-uyumlastirilmis-tasarim-ve-imalat-standartlari\/\">EN 13445 \/ EN 13480 Pressure Vessel and Industrial Piping Design<\/a><\/li>\n\n\n<li><a href=\"https:\/\/aesinn.com\/en\/muayene-periyodik-kontrol\/mekanik-ekipman-muayeneleri\/api-510-570-653-statik-ekipman-muayene-kodlari-basincli-kap-proses-boru-hatti-ve-depolama-tanki\/\">API 510 \/ 570 \/ 653 Static Equipment Inspection Codes<\/a><\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What exactly does ASME PCC-1 cover?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This covers the correct assembly of bolted flanged connections that form the pressure limit. It is a guideline of good practice that combines assembly variables such as gasket selection, bolt preload, and controlled tightening; it is not a mandatory design code.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Are PCC-1 and PCC-2 the same thing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. PCC-1 focuses on the assembly quality of bolted flange connections; PCC-2 is a separate document dealing with the repair of pressure equipment. This page is only covered under PCC-1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How is installer qualification handled?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Appendix A of PCC-1 provides graded criteria and program quality control for the training and qualification of bolted connection assembly personnel. Suitability of the application requires technical assessment by a qualified engineer according to service conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why is cross-tightening recommended instead of circular tightening?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In circular tightening, bolts tightened early can lose preload as their neighbors tighten; this is the cross-talk effect. Multi-pass sequential cross-tightening reduces this loss by distributing the seal load more evenly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What are the most common causes of leaks in flange connections?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Leaks are usually assembly-related: insufficient or excessive bolt load, skipped passes, incorrect tightening sequence, faulty gasket selection or placement, and flange surface defects are the main root causes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does AES provide certification for flange fitters?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. AES is not a certification or accredited body, and personnel certification is the responsibility of separate accredited organizations. AES accreditation is limited to the 6.1 Electrical Installation field only. This content is for informational purposes only.<\/p>","protected":false},"excerpt":{"rendered":"<p>ASME PCC-1, bas\u0131n\u00e7l\u0131 s\u0131n\u0131r c\u0131vatal\u0131 flan\u015fl\u0131 ba\u011flant\u0131lar\u0131n s\u0131zd\u0131rmaz \u015fekilde monte edilmesi i\u00e7in conta se\u00e7imi, c\u0131vata \u00f6n y\u00fck\u00fc ve s\u0131kma s\u0131ras\u0131 k\u0131lavuzudur. Bu i\u00e7erik bilgilendirme ama\u00e7l\u0131d\u0131r.<\/p>","protected":false},"author":1,"featured_media":6233,"parent":2518,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_kad_blocks_custom_css":".transparent-header.content-title-style-hide .content-area{padding-top:140px;}@media (max-width:767px){.transparent-header.content-title-style-hide .content-area{padding-top:90px;}}","_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":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","slim_seo":{"title":"ASME PCC-1 Bolted Flange Mounting Connector","description":"ASME PCC-1 objectively explains the scope, installer competence, bolt tightening methods, and root causes of gasket and flange joint leakage."},"_pplb_hide_from_list":false,"footnotes":""},"class_list":["post-6229","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"taxonomy_info":[],"featured_image_src_large":["https:\/\/aesinn.com\/wp-content\/uploads\/pcc1-aes-kart-1024x1024.png",1024,1024,true],"author_info":{"display_name":"Emre Metin","author_link":"https:\/\/aesinn.com\/en\/author\/yonetim\/"},"comment_info":"","_hostinger_reach_plugin_has_subscription_block":false,"_hostinger_reach_plugin_is_elementor":false,"_links":{"self":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/6229","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/comments?post=6229"}],"version-history":[{"count":2,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/6229\/revisions"}],"predecessor-version":[{"id":6238,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/6229\/revisions\/6238"}],"up":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/pages\/2518"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/media\/6233"}],"wp:attachment":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/media?parent=6229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}