Standard size of pipe fittings

Pipe size (Inch and metric comparison table)

Inches are length units. 1 inch = 2.539999918 cm (cm). Inches or [吋] is used in the United Kingdom (UK, the United Kingdom (Commonwealth) length unit. It is also used in countries such as the United States. In Taiwan and Hong Kong, "inch" is usually written as "吋". The common abbreviation for inches is [ In] or ["] "吋" is a newly created word in modern times. It is pronounced "inch". It is a word that reads two words in Chinese characters. Others such as "浬" are pronounced "海里", etc., borrowing Chinese traditional length units. "Inch", and add aside to show the difference.

First, the size:

DN15 (4 in charge), DN20 (6 in charge), DN25 (1 inch tube), DN32 (1 inch 2 tube), DN40 (1 inch half tube), DN50 (2 inch tube), DN65 (2 inch half tube), DN80 (3 inch tube), DN100 (4 inch tube), DN125 (5 inch tube), DN150 (6 inch tube), DN200 (8 inch tube), DN250 (10 inch tube), etc.

Second, divide 1 inch into 8 equal parts:

1/81/43/81/25/83/47/8 inches.

This is equivalent to the usual one-to-one to seven-point pipe. The smaller size is expressed in 1/16, 1/32, 1/64, and the unit is still inches. If the denominator and the molecule can be divided (eg, the molecules are 2, 4, 8, 16, 32), they should be approximated.

The inch is indicated by two inches in the upper right corner, such as 1/2"

For example, the water pipe of DN25 (25mm, the same below) is the British 1" water pipe, which is also the previous 8 pipe.

The DN15 water pipe is an inch 1/2" water pipe, which is also the previous 4 water pipe.

For example, the DN20 water pipe is an inch 3/4" water pipe, which is also the previous 6 water pipe.

The relationship between the outer diameter and DN, NB is as follows:

Pipe fitting standard

Current national standard

GB/T10752-1995 marine steel pipe butt welding head

GB/T12772-1999 Flexible interface cast iron pipe and fittings for drainage

GB/T8803-2001 injection molding of rigid polyvinyl chloride (PVC-U), chlorinated polyvinyl chloride (PVC-C), acrylonitrile-butadiene-styrene terpolymer (ABS) and acrylonitrile-benzene Ethylene-acrylate terpolymer (ASA) pipe fitting hot oven test method

GB/T8802-2001 Determination of Vicat softening temperature of thermoplastic pipes and fittings

GB/T18251-2000 Method for determination of pigment or carbon black dispersion in polyolefin pipes, tubes and compounds

GB/T18474-2001 Test method for cross-linking degree of cross-linked polyethylene (PE-X) pipes and fittings

GB/T18475-2001 Thermoplastic pressure pipes and fittings for the classification and naming of the overall use (design) coefficient

GB/T18742.3-2002 Polypropylene piping systems for hot and cold water - Part 3: Pipe fittings

GB/T18991-2003 Thermoplastic pipes and fittings for hot and cold water systems

GB/T18993.3-2003 Chlorinated polyvinyl chloride (PVC-C) piping systems for hot and cold water - Part 3: Pipe fittings

GB/T18998.3-2003 Industrial chlorinated polyvinyl chloride (PVC-C) piping systems - Part 3

GB/T19228.3-2003 rubber O-ring seal for stainless steel clamp pipe fittings

GB/T19278-2003 General terminology and definition of thermoplastic pipes, fittings and valves

GB/T19473.3-2004 Polybutene (PB) piping systems for hot and cold water - Part 3: Pipe fittings

GB/T12459-2005 steel butt welding seamless pipe fittings

GB/T19712-2005 plastic pipe and fittings polyethylene (PE) saddle bypass impact test method

GB15558.2-2005 Gas-filled polyethylene (PE) piping systems - Part 2: Pipe fittings

GB/T13663.2-2005 Polyethylene (PE) piping systems for water supply - Part 2: Pipe fittings

GB/T19806-2005 extrusion pipe peeling test of plastic pipe and fittings polyethylene electrofusion assembly

GB/T19807-2005 Preparation of plastic pipe and pipe fittings for polyethylene pipe and electrofusion pipe fittings

GB/T19808-2005 Tensile Peel Test of Polyethylene Electrofusion Assembly with Nominal Outer Diameter of Plastic Pipe and Fittings Greater than or Equal to 90mm

GB/T19809-2005 Preparation of hot-melt butt joints for plastic pipes and fittings polyethylene (PE) pipe/pipe or pipe/pipe fittings

GB/T19810-2005 Determination of tensile strength and failure mode of polyethylene (PE) pipes and fittings hot-melt butt joints

GB/T13401-2005 steel plate butt welded pipe fittings

GB/T19993-2005 Thermoplastic circulating pipe system tubular pipe fitting system thermal cycle test method for hot and cold water

GB/T5836.2-2006 rigid polyvinyl chloride (PVC-U) pipe fittings for building drainage

GB/T15819-2006 Test methods and technical requirements for environmental stress cracking susceptibility of polyethylene (PE) pipes for irrigation from plug-in fittings

GB/T20201-2006 irrigation polyethylene (PE) pressure pipe mechanical connection pipe fittings

GB/T20207.2-2006 Acrylonitrile-butadiene-styrene (ABS) pressure piping systems - Part 2

GB/T20674.2-2006 Plastic pipes and fittings - Polyethylene system welding equipment - Part 2

GB/T20674.1-2006 Plastics pipes and fittings - Polyethylene system welding equipment - Part 1

GB/T8801-2007 hard polyvinyl chloride (PVC-U) pipe fittings falling test method

GB/T21300-2007 Determination of opacity of plastic pipes and fittings

GB/T21409-2008 General rules for the inspection, installation and use of glass equipment, pipes and fittings

GB/T21408-2008 versatility and interchangeability of glass equipment, pipes and fittings from 15mm to 150mm caliber pipes and fittings

GB/T14383-2008 forged socket welding and threaded pipe fittings

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