Elbow classification Elbow standard elbow usage range Elbow technical requirements
Introduction
Elbow is a commonly used connecting pipe fitting in plumbing installation,It is used to connect pipe corners and change the direction of the pipe.
Other names: 90° elbow, right-angle bend, love bend, stamping elbow, pressed elbow, machine-made elbow, welding bend First class.
Purpose: to connect two pipes with the same or different nominal diameters to make the pipelines 90°, 45 °, 180° and various degrees of turns.
The bending radius is less than or equal to 1.5 times of the pipe diameter, which belongs to the elbow, is larger than the pipe diameter Diameter1.5times belongs to the elbow.
Technical requirements
1. Since most pipe fittings are used for welding, in order to improve the welding quality, the end All parts are beveled, leaving a certain angle and a certain edge. This requirement is also relatively strict. There are regulations on the thickness of the edge, the angle and the deviation range. The surface quality and mechanical properties are basically the same as those of pipes. For the convenience of welding, the steel grade of the pipe fittings and the pipes being connected is the same.
2. All pipe fittings must undergo surface treatment. The iron oxide scale on the inner and outer surfaces is blasted off through shot blasting, and then coated with anti-corrosion paint. This is for export needs. Moreover, domestically, it is also to facilitate transportation and prevent rust and oxidation, so work in this area must be done.
3. The requirement for packaging is that for small pipe fittings, such as export, they need to be made of wooden boxes, about 1 Cubic meters, it is stipulated that the number of elbows in such a box cannot exceed approximately one ton. This standard allows sets, that is, large sets and small sets, but the total weight generally cannot exceed 1 tons . For large items y must be packaged individually, such as 24″ must be packaged individually. The other is packagingMarking, marking should indicate the size, steel number, batch number, manufacturer’s trademark, etc.
Classification
Classified by material
Carbon steel: ASTM /ASME A234 WPB, WPC
Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911、15Mo3 15CrMoV、 35CrMoV
Stainless Steel:ASTM/ASME A403 WP 304-304L-304H-304LN-304N
ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti
ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low temperature steel:ASTM/ASME A402 WPL3-WPL 6
High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70
Cast steel, alloy steel, stainless steel, copper, aluminum alloy , plastic, argon leaching, PVC, PPR, RFPP(Reinforced polypropylene)etc.
Based on the production method, it can be divided into pushing, pressing, forging, casting, etc.
Based on manufacturing standards, it can be divided into national standard, electric standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc.
According to its radius of curvature: it can be divided into long radius elbow and short radius elbow. Long radius elbow refers to the outer diameter of the pipe whose radius of curvature is equal to 1.5 times, that is,R=1.5D; short radius Elbow means that its radius of curvature is equal to the outer diameter of the pipe, that is,R=1.0DR=1.0Dpan>. (D is the diameter of the elbow, R is the radius of curvature).
If divided by pressure level: there are about seventeen types, which are the same as the American pipe standards, including: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS;The most commonly used ones are STDandXS.
According to different shapes and uses, it can be divided into: grooved elbow, ferrule elbow, double-bearing elbow, flange elbow, reducing elbow, and seated elbow , Internal and external tooth elbows, stamping elbows, push elbows, socket elbows, butt welding elbows, internal wire elbows, etc.
General categories
Flexible elbow, sleeve type elbow, edged elbow, quick-installation elbow, seated elbow, flange elbow180° Elbow Double-bearing Elbow Single-bearing Elbow
Socket Elbow Reducing Elbow Seamless Elbow Butt Welding Elbow90° Elbow45° Elbow Combination Tee Internal Thread ElbowStamping elbow, pushed elbow, high pressure elbow, wear-resistant elbow, mechanical elbow, flange elbow, grooved elbow, three-dimensional elbow, external thread elbow, threaded elbow, special elbow, waterproof elbow
Standard
Japanese Standard
Standard number description.
JIS B2311 General purpose steel butt welding pipe fittings.
JIS B2312 Steel butt-welded pipe fittings.
JIS B2313Butt welded pipe fittings made of steel plate.
JIS B2316 Steel socket welded pipe fittings.
American standards for pipe fitting implementation standards:
Standard number description
ASME/ANSI B16.9 Factory-made forged steel butt-weld fittings
ASME/ANSI B16.11 Socket-weld and threaded forged fittings
ASME/ANSI B16.28 Steel butt welding small radius elbows and return bends
ASME B16.5 Pipe flanges and flange accessories
MSS SP-43 Forged stainless steel butt welding pipe fittings
MSS SP-79 Socket welding reducing inserts
MSS SP-83 Socket weld and threaded unions
MSS SP-97 Integral reinforced pipe seats for socket weld, threaded and butt weld ends span>
Electricity standards
Standard number description
GB2000Steam and water in thermal power plants Typical Design Manual for Pipe Parts and Components
DL/T515-93Power Station Bend Pipe
D-GD87-1101 Pipe Parts and typical design of components
Chemical standards for pipe fittings implementation standards:
Standard number description
HGJ514 Carbon steel and low alloy steel seamless butt welding pipe fittings
HGJ528 Steel seam butt welding pipe fittings
HGJ10 Forged steel socket weld pipe fittings
HGJ529 Forged steel socket weld, threaded and butt weld pipe stands
HGJ-44-76-91 Steel pipe flanges, gaskets, fasteners
HG20592-20635 Steel pipe flanges, gaskets, fasteners Firmware
Sinopec Standard
Standard No. Description
SH3406 -1996Petrochemical Steel Pipe Flange
SH3408 -1996Steel butt welded seamless pipe fittings
SH3409-1996 Forged steel socket welded pipe fittings
SH3410 -1996Forged steel socket welded pipe fittings
SH3065-1994Petrochemical tube furnace sharp bending technology Standard
National Standard
Standard number description
GB/T12459-2005 Steel butt welding Seamless pipe fittings
GB/T13401-2005 Steel plate butt welded pipe fittings
GB/T14383 Forged steel socket welded pipes Fittings
GB/T17185-1995Steel flange pipe fittings
Petroleum standards among the pipe fittings implementation standards:
Standard number description
SY/T0510-1998 Steel butt welded pipe fittings
SY/T5257-2004 Steel Bend pipe
02S403 National construction standards for steel pipe fittings
Marine standards
GB/T10752-1995Marine steel pipe butt welding joint
CB/T3590-94 Aluminum brass elbow
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