{"id":6965,"date":"2025-05-21T17:22:42","date_gmt":"2025-05-21T09:22:42","guid":{"rendered":"https:\/\/www.topfirefighting.com\/?p=6965"},"modified":"2025-05-21T17:22:42","modified_gmt":"2025-05-21T09:22:42","slug":"pipe-joint-solutions","status":"publish","type":"post","link":"https:\/\/www.topfirefighting.com\/th\/pipe-joint-solutions\/","title":{"rendered":"Pipe joint solutions"},"content":{"rendered":"

Pipe joint solution<\/strong><\/h1>\n

Core challenges and preliminary preparation<\/strong><\/h2>\n

Before connecting unthreaded galvanized pipes and PVC pipes, the following challenges need to be clarified:<\/p>\n

    \n
  1. Material differences: PVC and metal have different thermal expansion coefficients, and temperature changes may cause the interface to loosen.<\/li>\n
  2. Galvanic corrosion: Metal-plastic contact may accelerate the corrosion of the galvanized layer (dielectric isolation is required).<\/li>\n
  3. Size adaptation: The outer diameter (OD) of galvanized pipes and PVC pipes is inconsistent, and a matching transition joint is required.<\/li>\n<\/ol>\n

    Preparation:<\/strong><\/h2>\n

    Tool list: pipe cutter, deburring tool, tape measure, wrench, PVC glue, rubber coupler or compression joint.<\/p>\n

    Material inspection: Confirm that there is no severe rust on the surface of the galvanized pipe and no cracks on the PVC pipe.<\/p>\n

    Detailed explanation of connection methods<\/strong><\/h2>\n

    Rubber coupler (Fernco Coupling) – suitable for drainage and low-pressure systems<\/p>\n

    Applicable scenarios: non-pressure scenarios such as basement drainage and irrigation systems.<\/p>\n

    Advantages: No threads required, fast installation, low cost.<\/p>\n

    Steps:<\/b><\/strong><\/h3>\n

    Cutting and cleaning:<\/b><\/strong><\/h4>\n
      \n
    1. Use a rotary cutter to cut the galvanized pipe and PVC pipe to a flush position, ensuring that the port is free of burrs.<\/li>\n
    2. If the galvanized pipe is rusty, use sandpaper to polish it until it is smooth.<\/li>\n<\/ol>\n

      Install the coupler:<\/b><\/strong><\/h4>\n
        \n
      1. Loosen the stainless steel clamp of the rubber coupler and put it on one end of the galvanized pipe.<\/li>\n
      2. Insert the PVC pipe into the other end of the coupler and adjust the alignment.<\/li>\n<\/ol>\n

        Fix the clamp:<\/b><\/strong><\/h4>\n

        Use a screwdriver to tighten the clamp evenly to avoid uneven sealing caused by one-sided force.<\/p>\n

        Note:<\/p>\n

          \n
        1. Choose a coupler that fits the pipe diameter (such as a 2-inch pipe requires a 2-inch coupler).<\/li>\n
        2. Avoid using it in high temperature or high pressure environments, as rubber is prone to aging.<\/li>\n<\/ol>\n

          Compression Fitting – Medium and low pressure water supply system<\/strong><\/h2>\n

          Applicable scenarios: household water supply pipes, small pressurized irrigation systems.<\/p>\n

          Advantages: Strong sealing and can withstand a certain water pressure.<\/p>\n

          Steps:<\/b><\/strong><\/h3>\n

          Select adapter:<\/b><\/strong><\/h4>\n

          Purchase a compression joint for galvanized pipe to PVC (usually made of brass, with a metal compression ring on one end and a PVC socket on the other end).<\/p>\n

          Install the metal end:<\/b><\/strong><\/h4>\n

          Put the metal end of the compression joint on the galvanized pipe, tighten the nut, and use the compression ring to squeeze the pipe to achieve a seal.<\/p>\n

          Connect the PVC end:<\/b><\/strong><\/h4>\n

          Apply special glue to the PVC pipe mouth, insert the joint socket, and keep it for 30 seconds to cure.<\/p>\n

          Notes:<\/p>\n

            \n
          1. The outer diameter of the galvanized pipe must be strictly matched with the inner diameter of the compression ring. An error of more than 1mm may cause leakage.<\/li>\n
          2. Before the pressure test, it needs to stand for 2 hours to ensure that the glue is completely cured.<\/li>\n<\/ol>\n

            Flange Joint – Industrial or large diameter system<\/strong><\/h2>\n

            Applicable scenarios: factory pipelines, large drainage systems (pipe diameter \u2265 4 inches).<\/p>\n

            Advantages: strong pressure bearing capacity, easy to disassemble and maintain.<\/p>\n

            Steps:<\/b><\/strong><\/h3>\n

            Welding flange:<\/b><\/strong><\/h4>\n
              \n
            1. Weld a steel flange on the end of the galvanized pipe (rust-proof treatment is required).<\/li>\n
            2. Glue the PVC flange with bolt holes to the end of the PVC pipe.<\/li>\n<\/ol>\n

              Alignment and sealing:<\/b><\/strong><\/h4>\n

              Place a rubber gasket between the two flanges and tighten them diagonally with bolts to ensure uniform pressure.<\/p>\n

              Notes:<\/p>\n

                \n
              1. Welding must be performed by professionals to avoid the release of toxic gases from the high temperature of the galvanized layer.<\/li>\n
              2. Bolts need to be checked regularly to prevent rust and loosening.<\/li>\n<\/ol>\n

                Transition Cement – temporary or low-cost solution<\/strong><\/h2>\n

                Applicable scenarios: temporary repairs, non-drinking water systems (such as rainwater pipes).<\/p>\n

                Advantages: No additional joints are required, and the cost is extremely low.<\/p>\n

                Steps:<\/b><\/strong><\/h3>\n

                Processing the galvanized pipe end:<\/b><\/strong><\/h4>\n

                Grind the galvanized pipe end to increase the adhesion of the glue.<\/p>\n

                Apply transition glue:<\/b><\/strong><\/h4>\n

                Use PVC-Metal special glue (such as Oatey\u00ae Heavy Duty) to evenly apply it to the connection between the galvanized pipe and the PVC pipe.<\/p>\n

                Fixing and curing:<\/b><\/strong><\/h4>\n

                Press the two tightly and fix them with a clamp for 24 hours.<\/p>\n

                Notes:<\/p>\n

                  \n
                1. Only suitable for low-pressure scenarios, long-term use is prone to failure.<\/li>\n
                2. Glue may contain harmful substances and is prohibited for drinking water pipes.<\/li>\n<\/ol>\n

                  List of tools and materials<\/p>\n\n\n\n\n\n\n
                  Category<\/td>\nSpecific Items<\/td>\n<\/tr>\n
                  Tools<\/td>\nPipe cutter, screwdriver, wrench, sandpaper, tape measure<\/td>\n<\/tr>\n
                  Materials<\/td>\nRubber coupler, compression joint, flange, PVC glue, dielectric gasket<\/td>\n<\/tr>\n
                  Installation equipment<\/td>\nGoggles, anti-rust gloves, gas mask (when welding)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                  Summary<\/strong><\/h2>\n

                  The connection between non-threaded galvanized pipe and PVC pipe needs to be flexibly selected according to the specific scenario:<\/p>\n

                    \n
                  1. Drainage\/low-pressure system: Rubber coupler is preferred, which is low-cost and easy to install.<\/li>\n
                  2. Water supply\/medium-pressure system: Compression joint or flange is more reliable.<\/li>\n
                  3. Temporary repair: Transition bonding can be used as an emergency solution.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

                    Pipe joint solution Core challenges and preliminary preparation Before connecting unthreaded galvanized pipes and PVC pipes, the following challenges need to be clarified: Material differences: PVC and metal have different thermal expansion coefficients, and temperature changes may cause the interface to loosen. Galvanic corrosion: Metal-plastic contact may accelerate the corrosion of the galvanized layer (dielectric […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,20],"tags":[],"class_list":["post-6965","post","type-post","status-publish","format-standard","hentry","category-news","category-fluidtech-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/posts\/6965","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/comments?post=6965"}],"version-history":[{"count":0,"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/posts\/6965\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/media?parent=6965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/categories?post=6965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.topfirefighting.com\/th\/wp-json\/wp\/v2\/tags?post=6965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}