Water treatment, the pipeline as an essential transport liquid, gas, or gas-liquid mixture of the device, the size of its diameter usually determines the delivery capacity, so today Xiaobian and we will understand the pipe diameter DN What is the difference with De? DN DN refers to the nominal diameter of the pipe, Note: This is neither the outer diameter nor the inner diameter; should be associated with the early development of pipeline engineering and English units; commonly used to describe the galvanized steel pipe, which corresponds to the English unit as follows: 4 in charge: 4/8 inch: DN15; 6 in charge: 6/8 inch: DN20; 1 inch tube: 1 inch: DN25; inch two tubes: 1 and 1/4 inch: DN32; Inch half tube: 1 1/2 inch: DN40; Two-inch tube: 2 inches: DN50; Three-inch tube: 3 inches: DN80 (many places also labeled as DN75); Four-inch tube: 4 inches: DN100; De De mainly refers to the pipe diameter, the general use of De marked, all need to be marked as the outer diameter X wall thickness of the form; mainly used to describe: seamless pipe, PVC and other plastic pipes, and other need to clear the wall thickness of the pipe. Take galvanized welded steel pipe as an example, with DN, De two methods are as follows: DN20 De25 × 2.5mm DN25 De32 × 3mm DN32 De40 × 4mm DN40 De50 × 4mm We are accustomed to the use of DN to mark the welded steel pipe, in the case of wall thickness is rarely used to mark the pipe; but marking the plastic pipe is another matter; or with the industry habits, the actual construction process We abbreviated 20,25,32 and other pipe refers to the De, rather than refers to the DN, here is a difference between a specification yet. Do not figure it out easily in the procurement, construction process caused losses. Two kinds of pipe material connection is nothing more than: threaded connections and flange connections. Other connections are rarely used. Galvanized steel, PPR pipe can use the above two connections, but less than 50 with the pipe thread more convenient, more than 50 with a more reliable flange. Note: If two different types of metal pipe connected to consider whether there will be a galvanic cell reaction, otherwise it will speed up the corrosion of active metal pipe corrosion rate, it is best to use flange connection, and rubber gasket type insulation material will be two Species separated by metal, including bolts should be separated with a gasket to avoid contact. De, DN, d, Ñ„ their respective range! De - PPR, PE pipe, polypropylene pipe diameter DN - Polyethylene (PVC) pipe, cast iron pipe, steel-plastic composite pipe, galvanized steel pipe Nominal diameter a d - Nominal diameter of concrete pipe Ñ„ (read fai) - the nominal diameter of seamless steel pipe, its specifications, such as Ñ„100: 108 × 4 DN15-Ñ„22mm, DN20-Ñ„27mm, DN25-Ñ„34mm, DN32-Ñ„42mm, DN40-Ñ„48mm, DN50-Ñ„60mm, DN65-Ñ„76 (73) mm, DN80-Ñ„89mm, DN100-Ñ„114mm, DN125-Ñ„140mm, DN150-Ñ„168mm, DN200-Ñ„219mm, DN250-Ñ„273mm, DN300-Ñ„324mm, DN350-Ñ„360mm, DN400-Ñ„406mm, DN450-Ñ„457mm, DN500-Ñ„508mm, DN600-Ñ„610mm, DN15-Ñ„18mm, DN20-Ñ„25mm, DN25-Ñ„32mm, DN32-Ñ„38mm, DN40-Ñ„45mm, DN50-Ñ„57mm, DN65-Ñ„73mm, DN80-Ñ„89mm, DN100-Ñ„108mm, DN125-Ñ„133mm, DN150-Ñ„159mm, DN200-Ñ„219mm, DN250-Ñ„273mm, DN300-Ñ„325mm, DN350-Ñ„377mm, DN400-Ñ„426mm, DN450-Ñ„480mm, DN500-Ñ„530mm, DN600-Ñ„630mm. ã€Print】 ã€Close】