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1 http://www.answers.com/pipe%20vs%20tube→WikiAnswers的解釋 A pipe is a tube. Tube is a shape. Pipe is the type of tube it is. A tube can be plastic, paper, wood, etc. (Pipe就是Tube，但Tube意在“管型”結(jié)構(gòu)(中空的)，Pipe意在“管為”原義(導(dǎo)流的)。Tube可以是塑料制、紙制、木制等) 2 http://www.bicyclesports.us/id198.htm的解釋 The difference between a pipe and a tube is how they are measured, and ultimately what they are used for. (pipe和tube的區(qū)別表面在于它們的大小標(biāo)稱，而實際在于它們的用途)      A pipe is a vessel - a tube is structural. (pipe是容液的—“管為”原義，tube是結(jié)構(gòu)性的—“管型”結(jié)構(gòu))      A pipe is measured ID - a tube is measured OD. (pipe以內(nèi)徑標(biāo)稱大小，tube以外徑標(biāo)稱大小)      How they are measured...  Pipes are measured ID or inside diameter because they are vessels.  Tubes are measured OD or outside diameter because they are structural. 3 http://www.diygokarts.com/articles/pipe-vs-tube.html的解釋 Round pipe is commonly available even at your local hardware store. Tubing is available at your metal supplier. Tube is called out by the outside diameter (OD). A 1" round tubing will be exactly 1". Pipe is called out by its inside diameter rather than its outside diameter. A 1" pipe will measure 1.315" OD. 4 http://www.answers.com/Water_pipe→Wikipedia的解釋 Pipe vs. Tube Pipe is usually rigid and is supplied in straight lengths. Tubing is either rigid and straight, or is flexible and supplied in rolls. Water pipe is measured by its Nominal Pipe Size (NPS). Pipe in other industries is also measured by its NPS, while tubing is described by its nominal diameter which is typically neither its actual inside or outside diameter. Soft-temper copper tubing, used for air conditioning and refrigeration ('ACR'), is described by its actual outside diameter, however. 5 《ASME B36.10 Welded and Seamless Wrought Steel Pipe》標(biāo)準(zhǔn)的解釋 This Standard covers the standardization of dimensions of welded and seamless wrought^注 steel pipe for high or low temperatures and pressures. The word pipe is used, as distinguished from tube, to apply to tubular products of dimensions commonly used for pipeline and piping systems. Pipe NPS 12 (DN 300) and smaller have outside diameters numerically larger than their corresponding sizes. In contrast, the outside diameters of tubes are numerically identical to the size number for all sizes.     本標(biāo)準(zhǔn)規(guī)定內(nèi)規(guī)管的尺寸，適用于高溫高壓或低溫低壓用已作鋼制焊接與無縫管。     內(nèi)規(guī)管(pipe)，與外規(guī)管(tube)所指不同，指普通管線(pipeline)和管系(piping system)用管。公稱內(nèi)徑管規(guī)格NPS(Nominal Pipe Size)不大于12吋(DN 300)的內(nèi)規(guī)管的外徑尺寸數(shù)字大于對應(yīng)的管規(guī)格數(shù)字。與此相反，所有規(guī)格的外規(guī)管的外徑數(shù)字等于對應(yīng)的管規(guī)格數(shù)字。注：Wrought, work的一種過去式和過去分詞，用作現(xiàn)代金屬原材料分類形容詞時，Unwrought(未經(jīng)任何再變形制作過的)，相當(dāng)于Cast(澆鑄的)，指鑄造的(坯料，第1類金屬原材料)； Wrought(經(jīng)過再變形制作過的)，指一切經(jīng)過再變形制作的非原始澆鑄的(材料，第2類金屬原材料，如棒、板、管、型材、鍛件等)；實際上，世界上只有這兩類金屬原材料，但至今，還未能正式引進(jìn)中文，例如，在下列一類標(biāo)準(zhǔn)使用中就顯得亂七八糟的： ASME B16.9 Factory-Made Wrought Buttwelding Fittings (已作料批制對焊端管件) ASME B16.28 Wrought Steel Buttwelding Short Radius Elbows and Returns (已作鋼制短徑對焊彎通和回通) ASME B16.50 Wrought Copper and Copper Alloy Braze-Joint Pressure Fittings (已作銅及銅合金制銅焊端壓力管件) ASME B36.10 Welded and Seamless Wrought Steel Pipe (已作鋼制焊接與無縫內(nèi)規(guī)管) EN 12165 Copper and copper alloys — Wrought and unwrought forging stock (銅及銅合金  鍛造用已作和未作料) MSS SP43 Wrought Stainless Steel Butt-Welding Fittings (已作不銹鋼制對焊端管件) MSS SP75 Specification for High-Test, Wrought, Butt-Welding Fittings (已作料制高壓對焊端管件)