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Pressure Pipe Standard System Chinese Pipe Standard System There are many application standards for pressure pipe components in China, and they are all incomplete. Taking pipe flange standards as an example, the commonly used standards are GB * * standards, JB machinery industry standards, SH petrochemical industry standards and HG chemical industry standards, etc. Each of these standards has its own temperature-pressure gauge, sealing surface size and pipe size. They are not interchangeable with each other, and some cannot even be used together. In order to apply these standards well, this article introduces the currently commonly used Chinese pressure pipeline application standard system. Petrochemical industry application standard system ◆ Pipe size series standard (SH3405) basically belongs to the "large outer diameter series" SH3405 equivalently adopts the ISO4200 standard, so when DN ≤ 1100mm, it can be used in conjunction with the ANSI B36.l/36.19 standard. SH3405 diameter range and wall thickness classification: No. Steel pipe category Nominal diameter range Wall thickness classification 1 Austenitic stainless steel seamless steel pipe 10~400 Sch5s, Sch10s, Sch20s, Sch40s, Sch80s 2 Carbon steel, alloy steel seamless steel pipe 10~600 Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160, XXS 3 Austenitic stainless steel welded steel pipe 80~1000 2.0~12mm 4 Carbon steel, alloy steel welded steel pipe 150~2000 4.0~18mm ◆Flange standard (SH3406): Belongs to "American flange" nominal pressure: PN1.0, PN2.0(CL150), PN5.0(CL300), PN6.8(CL400), PN10.0(CL600), PN15.0(CL900), PN25.0(CL1500), PN42.0(CL2500) 8 grades of nominal diameter: DN15~DN1500mm flange sealing surface: When DN ≤ 600, there are 5 flange types: convex table surface, concave and convex surface, full plane, tongue and groove surface, and ring groove surface. When DN ≥ 650, there is 1 flange type for convex table surface.: When DN ≤ 600, there are 5 types of flat welding, butt welding, socket welding, threaded connection, and loose sleeve. When DN ≥ 650, there is 1 type of butt welding. ※ SH3406 equivalently adopts ANSI B16.5 and API 605 standards. SH3406 has good interchangeability with ANSI B16.5/API605 in terms of structural dimensions and sealing surface type. It can be used with ANSI, API, MSS and other standard pipeline components. However, because SH3406 adopts my country's material standards instead of American material standards (ASTM), there is a slight deviation in the temperature-pressure gauges of the two. Therefore, when considering the interchange of the two, you should pay attention and check their temperature-pressure corresponding allowable values. ◆Commonly used standards in the petrochemical industry application standard system SH3401 Asbestos rubber sheet gasket for pipe flange SH3402 PTFE coated gasket for pipe flange SH3403 Metal ring gasket for pipe flange SH3404 Fastener for pipe flange SH3405 Petrochemical enterprise steel pipe size series SH3406 Petrochemical steel pipe flange SH3407 Wound gasket for pipe flange SH3408 Steel butt welding seamless pipe fittings SH3409 Steel plate butt welding pipe fittings SH3410 Forged steel socket welding pipe fittings The petrochemical industry application standard system is a relatively complete application standard system. Because it adopts the ANSI standard equivalently, it represents the direction of advancement and development. And because its flange (SH3406) can be matched with API standard valves. Applications in recent years have proven that this application standard system is a scientific, advanced and operable standard system. Chemical industry application standard system ◆ Pipe size series standards (HG20553) A series: Belongs to the "Large Outer Diameter Series" B Series: Belongs to the "Small Outer Diameter Series" ◆Flange standards include both European flanges and American flanges European flanges (HG20592~HG20605) Pressure level: PN 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0, 25.0 and other 10 grades of nominal diameter: DN10~DN2000mm flange type: 10 sealing surface types including plate flat welding, neck flat welding, neck butt welding, integral, socket welding, thread, butt welding ring loose sleeve, flat welding ring loose sleeve, flange cover, lined flange, etc.: There are 5 types: raised surface, concave and convex surface, tongue and groove surface, ring connection surface, and full plane. It can be used in conjunction with JB valves. . American flange standard (HG20615-HG20626) nominal pressure: PN2.0, PN5.0, PN11.0, PN15.0, PN26.0 and PN42.0 6 pressure levels Nominal diameter: DN15~1500 Flange type: 6 types: neck flat welding, neck butt welding, integral flange, socket welding, thread, loose sleeve, etc. 5 types of sealing surface: raised surface, concave and convex surface, tongue and groove surface, ring connection surface, full plane. .. ※The chemical industry pressure pipeline application standard system is also a relatively complete standard system, and has experienced several years of production practice testing and has mature usage experience. Because it has two series: "large outer diameter series" and "small outer diameter series", "European flange" and "American flange", it has a wide range of uses. It can be used in conjunction with foreign ANSI, DIN, ISO and other standards, as well as domestic GB, SH, JB and other standards. ◆Commonly used standards in the chemical industry application standard system HG 20537.1 Selection regulations for austenitic stainless steel welded steel pipes HG 20553 Seamless and welded steel pipe size selection series for chemical piping HG/T 21634 Forged steel socket welded pipe fittings HG/T 21635 Carbon steel and low alloy steel seam butt welded pipe fittings HG/T 21631 Steel seam butt welded pipe fittings HG/T 21632 Forged steel socket welding, threaded and butt welding pipe stands HG/T 21637 Chemical pipeline filters HG/T 21577 Quick special joints HG 20592~20605 Steel pipe flanges (European system) HG 20615~20626 Steel pipe flanges (American system) HG 20606~20612 Gaskets for steel pipe flanges (European system) HG 20627~20633 Gaskets for steel pipe flanges (American system) HG 20613 Steel pipe flange fasteners (European system) HG 20634 Steel pipe flange fasteners (American system) Machinery industry application standard system ◆ The pipe size belongs to the "small outer diameter series" ◆ Flange standard European flange pressure level: PN 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0, 20.0 and other 10 pressure grade nominal diameters: DN15~DN1600mm flange type: There are 7 sealing surface types including integral, plate flat welding, butt welding, flat welding ring plate loose sleeve, butt welding ring plate loose sleeve, flanged plate loose sleeve and flange cover.: Five types: flat surface, convex surface, concave and convex surface, tongue and groove surface, and ring connection surface. ※JB does not have corresponding pipe size series standards and pipe fitting standards. The system is very imperfect and needs the support of the GB system. ； The JB flange standard includes different grades of materials in the same temperature-pressure gauge, thus losing its scientific nature. ； The JB valve standard provides a selection series (reflected from each product compilation) with a limited model, which not only limits its scope of use, but also loses its flexibility. Judging from the application of many production equipment, the performance of JB valves is also unsatisfactory. ； JB valves cannot be used in conjunction with ANSI and are inconvenient to integrate with the world. ； ◆Commonly used standards in the machinery industry application standard system are: JB/T74 Pipe flange technical conditions JB/T75 Pipe flange type JB/T79.1~79.4 Integral cast steel pipe flange JB/T81 Plate flat welded steel pipe flange JB/T82.1~82.4 Butt welded steel pipe flange JB/T83 0.25, 0.6, 1.0, 1.6, 2.5MPa flat welding ring type loose sleeve steel pipe flange JB/T84 4.0, 6.3, 10.0MPa concave and convex face welding ring plate type loose sleeve steel pipe flange JB/T85 0.25, 0.6MPa flanged loose sleeve steel pipe flange JB/T86.1~86.2 Steel pipe flange cover, JB/4700~4703 Flange for pressure vessels JB/T87~90 Gasket for pipeline flange JB4704~4706 Gasket for pressure vessel * * Application standard system ◆Pipe size series standard GB17395 belongs to the "large outer diameter series" ◆Flange standard: (GB/T 9112-2000) Including European flanges and American flange pipes are divided into Series I and Series II. Series I is the "large outer diameter series" in order to match SH standards and other standards. ； Series II is the "small outer diameter series" in order to match JB standards and others. European flange: Divided into Series I and Series II, nominal pressure PN 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0MPa, 9 grades, nominal diameter DN10~2000mm, flange type: There are 9 sealing surface types: integral, threaded with neck, butt welding, flat welding with neck, plate flat welding, flat welding ring plate loose sleeve, butt welding ring plate loose sleeve, flanged ring plate loose sleeve and flange cover.: There are 4 types: flat surface, raised surface, concave and convex surface, and tongue and groove surface. American flange: Series I (large outer diameter) Nominal pressure PN 2.0, 5.0, 11.0, 15.0, 26.0, 42.0MPa 6 levels of nominal diameter DN10 ~ 600mm Flange type: There are 7 sealing surface types including integral, necked thread, butt welding, neck flat welding, neck socket welding, butt welding ring necked loose sleeve and flange cover.: Five types: flat surface, raised surface, concave and convex surface, tongue and groove surface, and ring connection surface. ※ It basically covers the "European system" standards of JB standards and HG standards, creating conditions for replacing these two standards; ※ The temperature-pressure grade value of "European flange" and "American flange" is determined by comparing the performance of Chinese materials with European materials and American materials, and selecting the pressure-temperature parameters of the corresponding materials specified in ISO7005-1. ※ pressure pipe * * The standard system is also a relatively complete standard system. Its pipe fitting standards are divided into two series, A and B. Series A is the "large outer diameter series" in order to match SH standards and other standards. ； The B series is a "small outer diameter series" in order to match JB standards and others. ◆China * * Commonly used standards in the application standard system GB 12459 Steel butt welding seamless pipe fittings GB/T 13401 Steel plate butt welding pipe fittings GB/T 14626 Forged steel threaded pipe fittings GB/T 14382 Three-pass filter for pipelines GB/T 14383 Forged steel socket welding pipe fittings GB/T 9112~9124 Steel pipe flange GB 4622.1~3 Wound gaskets for pipe flanges GB 9126.1~4 Asbestos rubber gaskets for pipe flanges GB 9128.1~2 Metal ring gaskets for pipe flanges GB/T 13404 Polytetrachlorethylene-coated gaskets for pipe flanges GB/T 15601 Metal-coated gaskets for pipe flanges GB 30 Hexagonal bolts GB 52 Hexagonal nuts GB 56 Hexagonal thick nuts GB 901 Equal-length double-headed studs, grade B GB 6170 Type I hexagonal nuts, grade A and B GB 6171 Type I hexagonal nuts, fine threads, grade A and B GB 6175 Type II hexagonal nuts, grade A and B. GB 6176 Dish-type hexagonal nut fine thread A and B grade pressure pipe application standard system 1. There are many available pressure pipe application standard systems, and some of the standard systems cannot be used together. Although some can basically be used together, there are still individual problems that should be paid attention to. 2. One device or several devices constructed at the same time should try to use the same application standard system, so as to avoid some errors caused by coordination problems between different standard systems. 3. In projects, we often encounter situations where two or more sets of application standard systems are used on one device at the same time, or because the application standards of a certain set of standard systems are imperfect and require support from the standards of other systems. This requires materials engineers not only to understand the relevant standard systems, but also to know the standard coordination issues between various systems. 5. Pay attention to check the temperature-pressure value of each standard.