First, the classification of elbows:
1. The elbow is divided according to its radius of curvature and can be divided into a long radius elbow and a short radius elbow. The radius of curvature of the long radius elbow is equal to 1.5 times the outer diameter of the tube, ie R = 1.5D. The radius of curvature of the short radius elbow is equal to the outer diameter of the tube, ie R=D. Where D is the diameter of the elbow and R is the radius of curvature.
2. If there are about 17 kinds according to the pressure level, they are the same as the American pipe standards: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, the most commonly used are STD and XS.
3. According to the angle of the elbow, there are 45 degree elbows, 90 degree elbows and 180 degree elbows.
In this way, there are many types of elbows. Generally, the following methods are used: "LR STD 90 degrees 8", which means long radius, pressure level is STD, 90 degree 8" elbow; another example, "SR XS 45o 4" means a short radius, a pressure rating of XS, a 45" 4" elbow.
Second, the elbow connection method
There are two ways to connect the elbow, one is [live connection], and the other is [fixed] (or called [dead connection])
[Live]: (also called detachable connection), is connected by thread.
[Fixed]: (also called non-removable connection), is connected by welding. There is a welding method of the welding sleeve.
Third, the national standard, the American standard elbow size
Inch nominal diameter DN center to end center to center back to end
45o90o180o
Center high H center high FPK
Long radius long radius short radius long radius short radius long radius short radius
1/2"151638 76 48
3/4"201638 76 51
1"2516382576515641
11/4" 3220483295647052
11/2"40245738114768362
2"5032765115210210681
21/2"65409564191127132100
3"804711476229152159121
31/2"905513389267178184140
4"10063152102305203210159
5"12579190127381254262197
6"15095229152457305313237
8"200126305203610406414313
10"250158381254762508518391
12"300189457305914610619467
14"3502215333561067711711533
16"4002536104061219813813610
18"4502846864571372914914686
20"500316762508152410161016762
22"550347838.2559167611181118838
24"600379914.4610182912191219914
26"650410990.6660
28"7004421066.8711
30"7504731143762
32"8005051219.2813
34"8505371295.4864
36"9005681371.6914
38"9506001447.8965
40"100063115241016
42"10506631600.21067
44"11006941676.41118
46"11507261752.61168
48"12007581828.81219
52"130082119811321
56"140088321341420
60"150094722861524
64"1600101024381620
68"1700107325911727
72"1800113727431829
76"1900119928961930
80"2000126330482032
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