{"id":980,"date":"2025-11-25T16:34:17","date_gmt":"2025-11-25T15:34:17","guid":{"rendered":"https:\/\/zetamec.com\/faq\/"},"modified":"2026-04-03T17:18:48","modified_gmt":"2026-04-03T15:18:48","slug":"faq","status":"publish","type":"page","link":"https:\/\/zetamec.com\/en\/faq\/","title":{"rendered":"FAQ"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row unlock_row_content=&#8221;yes&#8221; row_height_percent=&#8221;0&#8243; override_padding=&#8221;yes&#8221; h_padding=&#8221;2&#8243; top_padding=&#8221;0&#8243; bottom_padding=&#8221;2&#8243; back_color=&#8221;color-vyce&#8221; back_image=&#8221;316&#8243; back_position=&#8221;center bottom&#8221; overlay_color=&#8221;color-320767&#8243; overlay_alpha=&#8221;100&#8243; gutter_size=&#8221;3&#8243; column_width_percent=&#8221;100&#8243; shift_y=&#8221;0&#8243; z_index=&#8221;0&#8243; content_parallax=&#8221;0&#8243; uncode_shortcode_id=&#8221;816600&#8243; back_color_type=&#8221;uncode-palette&#8221; overlay_color_type=&#8221;uncode-palette&#8221; el_id=&#8221;intro-landing-dark&#8221; css=&#8221;.vc_custom_1764841710307{padding-top: 20px !important;}&#8221;][vc_column column_width_percent=&#8221;100&#8243; position_horizontal=&#8221;left&#8221; position_vertical=&#8221;middle&#8221; gutter_size=&#8221;3&#8243; style=&#8221;dark&#8221; overlay_alpha=&#8221;50&#8243; shift_x=&#8221;0&#8243; shift_y=&#8221;0&#8243; shift_y_down=&#8221;0&#8243; z_index=&#8221;0&#8243; medium_width=&#8221;0&#8243; mobile_width=&#8221;0&#8243; width=&#8221;1\/1&#8243; uncode_shortcode_id=&#8221;204026&#8243;][uncode_breadcrumbs text_lead=&#8221;small&#8221; el_id=&#8221;breadcrumbsss&#8221;][vc_row_inner][vc_column_inner column_width_use_pixel=&#8221;yes&#8221; position_vertical=&#8221;middle&#8221; align_horizontal=&#8221;align_center&#8221; gutter_size=&#8221;3&#8243; style=&#8221;dark&#8221; overlay_alpha=&#8221;50&#8243; shift_x=&#8221;0&#8243; shift_y=&#8221;0&#8243; shift_y_down=&#8221;0&#8243; z_index=&#8221;0&#8243; medium_width=&#8221;0&#8243; mobile_width=&#8221;0&#8243; width=&#8221;1\/1&#8243; uncode_shortcode_id=&#8221;413523&#8243; column_width_pixel=&#8221;1400px&#8221;][vc_custom_heading heading_semantic=&#8221;h1&#8243; text_size=&#8221;h1&#8243; css_animation=&#8221;curtain&#8221; uncode_shortcode_id=&#8221;131928&#8243;]FAQ[\/vc_custom_heading][vc_custom_heading heading_semantic=&#8221;p&#8221; text_size=&#8221;h3&#8243; css_animation=&#8221;alpha-anim&#8221; animation_delay=&#8221;600&#8243; uncode_shortcode_id=&#8221;159745&#8243;]Everything you need to know[\/vc_custom_heading][vc_separator sep_color=&#8221;color-wvjs&#8221; css_animation=&#8221;alpha-anim&#8221; animation_delay=&#8221;600&#8243; uncode_shortcode_id=&#8221;772285&#8243; sep_color_type=&#8221;uncode-palette&#8221;][vc_empty_space empty_h=&#8221;2&#8243;][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row row_height_percent=&#8221;0&#8243; override_padding=&#8221;yes&#8221; h_padding=&#8221;2&#8243; top_padding=&#8221;4&#8243; bottom_padding=&#8221;4&#8243; back_color=&#8221;color-369735&#8243; overlay_alpha=&#8221;50&#8243; gutter_size=&#8221;3&#8243; column_width_percent=&#8221;100&#8243; shift_y=&#8221;0&#8243; z_index=&#8221;0&#8243; content_parallax=&#8221;0&#8243; uncode_shortcode_id=&#8221;185182&#8243; back_color_type=&#8221;uncode-palette&#8221;][vc_column column_width_percent=&#8221;100&#8243; gutter_size=&#8221;3&#8243; overlay_alpha=&#8221;50&#8243; shift_x=&#8221;0&#8243; shift_y=&#8221;0&#8243; shift_y_down=&#8221;0&#8243; z_index=&#8221;0&#8243; medium_width=&#8221;0&#8243; mobile_width=&#8221;0&#8243; css_animation=&#8221;alpha-anim&#8221; animation_delay=&#8221;800&#8243; width=&#8221;1\/1&#8243; uncode_shortcode_id=&#8221;176463&#8243;][vc_accordion typography=&#8221;advanced&#8221; sign=&#8221;plus&#8221; content_border=&#8221;yes&#8221; title_padding=&#8221;yes&#8221; gutter_simple=&#8221;1&#8243; heading_semantic=&#8221;h2&#8243; titles_size=&#8221;h5&#8243; uncode_shortcode_id=&#8221;101305&#8243;][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What types of flanges exist?&#8221; tab_id=&#8221;1764246027-1-21&#8243;][vc_column_text uncode_shortcode_id=&#8221;937521&#8243;]<strong>Flat flanges (PL):<\/strong> Suitable for low pressures, welded to the pipe and cost-effective.<br \/><strong>Welding neck flanges (WN):<\/strong> Provide high strength, ideal for high-pressure and high-temperature applications thanks to welding on the pipe neck.<br \/><strong>Socket weld flanges (SW):<\/strong> The pipe is inserted into the flange before welding, offering good strength and easy assembly.<br \/><strong>Threaded flanges (TH):<\/strong> Screwed onto the pipe, suitable for non-critical applications.<br \/><strong>Blind flanges (BL):<\/strong> Close the ends of pipes or valves, creating a tight seal.[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;How are flanges classified?&#8221; tab_id=&#8221;1764246027-1-214&#8243;][vc_column_text uncode_shortcode_id=&#8221;578904&#8243;]<strong>Face type:<\/strong> flat face (FF), raised face (RF), male-female (MF), ring type joint (RTJ).<br \/><strong>Pressure rating:<\/strong> indicates the maximum pressure that can be withstood.<br \/><strong>Material:<\/strong> carbon steel, stainless steel, special alloys.<br \/><strong>Dimensions:<\/strong> diameter, thickness, hole diameter.[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What are the main applications of flanges?&#8221; tab_id=&#8221;1764246027-1-2140&#8243;][vc_column_text uncode_shortcode_id=&#8221;170170&#8243;]<strong>Chemical and petrochemical industry:<\/strong> for the transport of fluids and gases.<br \/><strong>Heating and cooling systems:<\/strong> for the transport of water and steam.<br \/><strong>Food and pharmaceutical industry:<\/strong> for the transport of liquids and sensitive products.<br \/><strong>Power plants:<\/strong> for the transport of fluids at high pressure and temperature.[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What is meant by a piping \u201cspool\u201d?&#8221; tab_id=&#8221;1764246027-1-21406&#8243;][vc_column_text uncode_shortcode_id=&#8221;171044&#8243;]A spool is the portion of pipe between two flanges.[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;How do you choose the right flange?&#8221; tab_id=&#8221;1764246027-1-214062&#8243;][vc_column_text uncode_shortcode_id=&#8221;967528&#8243;]<strong>Type of fluid:<\/strong> the flange material must be compatible with the transported fluid to avoid corrosion.<br \/><strong>Pressure and temperature:<\/strong> the flange must be able to withstand operating conditions.<br \/><strong>Application:<\/strong> the type of flange must be suitable for the specific application.<br \/><strong>Reference standards:<\/strong> flanges must comply with international or national standards (ANSI, DIN, UNI, EN, JIS).[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What are the main differences between AISI 304 and 316 steel?&#8221; tab_id=&#8221;1764246027-1-2140621&#8243;][vc_column_text uncode_shortcode_id=&#8221;152703&#8243;]AISI 316 steel contains molybdenum, which makes it more resistant to corrosion than AISI 304 steel, making it preferable in chemical, petrochemical, food and pharmaceutical environments.[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What does RF mean in flanges?&#8221; tab_id=&#8221;1764246027-1-21406212&#8243;][vc_column_text uncode_shortcode_id=&#8221;392656&#8243;](RF): It is the most commonly used flange face type. It is called \u201craised\u201d because the raised surface of this flange is positioned above the bolt circle where the gasket is located.[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What is the difference between ANSI and EN standards?&#8221; tab_id=&#8221;1764246027-1-214062120&#8243;][vc_column_text uncode_shortcode_id=&#8221;724543&#8243;]<span data-sheets-root=\"1\">The main difference between ANSI and EN flanges lies in dimensions, pressure classification and country of origin. ANSI flanges are standardized in the United States, while EN flanges are standardized in Europe. In addition, ANSI uses inches and psi for dimensions and pressures, while EN uses millimeters and bar.<\/span>[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What is the difference between schedule STD and 40 for EN welding neck flanges?&#8221; tab_id=&#8221;1764246027-1-2140621206&#8243;][vc_column_text uncode_shortcode_id=&#8221;126093&#8243;]<span data-sheets-root=\"1\">Flanges with schedule 40 have a greater thickness than those with schedule STD, for the same nominal diameter.<\/span>[\/vc_column_text][\/vc_accordion_tab][vc_accordion_tab gutter_size=&#8221;2&#8243; column_padding=&#8221;2&#8243; title=&#8221;What is the difference between micro-cast stainless steel and forged stainless steel?&#8221; tab_id=&#8221;1764246027-1-21406212067&#8243;][vc_column_text uncode_shortcode_id=&#8221;606115&#8243;]Micro-casting is suitable for complex shapes and can be more economical for small production batches or flanges with particular shapes, but it is not ideal for applications requiring high pressure resistance and tight sealing, as the presence of inclusions may compromise structural integrity. Forging, especially hot forging, produces a more compact and homogeneous metal structure without inclusions, resulting in greater strength and sealing performance. It is therefore the preferred choice for flanges operating under high pressure, high temperatures and where perfect tightness is required.[\/vc_column_text][\/vc_accordion_tab][\/vc_accordion][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row unlock_row_content=&#8221;yes&#8221; row_height_percent=&#8221;0&#8243; override_padding=&#8221;yes&#8221; h_padding=&#8221;2&#8243; top_padding=&#8221;0&#8243; bottom_padding=&#8221;2&#8243; back_color=&#8221;color-vyce&#8221; back_image=&#8221;316&#8243; back_position=&#8221;center bottom&#8221; overlay_color=&#8221;color-320767&#8243; overlay_alpha=&#8221;100&#8243; gutter_size=&#8221;3&#8243; column_width_percent=&#8221;100&#8243; shift_y=&#8221;0&#8243; z_index=&#8221;0&#8243; content_parallax=&#8221;0&#8243; uncode_shortcode_id=&#8221;816600&#8243; back_color_type=&#8221;uncode-palette&#8221; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":316,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-980","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>FAQ | Zetamec<\/title>\n<meta name=\"description\" content=\"Everything you need to know about Zetamec products.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FAQ | Zetamec\" \/>\n<meta property=\"og:description\" content=\"Everything you need to know about Zetamec products.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zetamec.com\/en\/faq\/\" \/>\n<meta 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