90 Degree Butt Weld Elbow – Supplier of Quality Forged Fittings-Flanges https://www.zzsteels.com Worldwide Pipe Fittings Exporter Thu, 29 Nov 2018 09:06:50 +0000 zh-Hans hourly 1 https://wordpress.org/?v=6.9 How to Calculate Butt Weld Elbow Weight https://www.zzsteels.com/2018/10/29/calculate-butt-weld-elbow-weight/ Mon, 29 Oct 2018 06:25:29 +0000 http://www.zzsteels.com/?p=3944 Approximate weight of a butt weld elbow can be calculated based on its its radius, wall thickness and angle. Do you know the formulas?

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Butt Weld Elbow is a basic fitting for changing direction of water, gas and oil pipelines. It is important to get the approximate weight which determines the cost. So how to calculate elbow weight in kg?

What Factors Influence Butt Weld Elbow Weight?

To know the elbow weight, we should know which factors decide weight.

Many factors influence its weight, the most influential factors are diameter, wall thickness, radius, and elbow degree.

Next, I will show you how to calculate weight based on those factors.

How to Calculate 90 Degree Elbow Weight?

People mainly use two ways to calculate the Butt Weld Pipe Fittings.

  • Calculate according to the weight formula.
  • Get the value from weight chart.

No matter which way you choose, the butt weld elbow weight is calculated based on 90 Degree. Because 90 Degree Carbon Steel Elbow is the most common type.

Calculate 90 Degree Steel Elbow by Formula

This method is a little difficult, because we should know some exact values in mm. They are outside diameter, wall thickness and bend radius. Unfortunately, it is not the unit we usually use to measure.

The formula of butt weld elbow or bend as below:

W=0.387 * S*(D – S) * R / 1000

Note:

  • W means Weight. The unit is Kg/piece.
  • S refers to wall thickness schedule.
  • D is nominal diameter.
  • R is Bend Radius. LR=1.5D, SR=1D.

For example, 1 inch 90 Degree LR Elbow Sch40 A234 WPB, From above information, we can get LR=1.5D, D=33.4mm, S=3.38mm, W = 0.387 * 3.38 * (33.4 – 3.38) * 1.5 * 33.4 / 1000 = 1.97. So it is 1.97 Kg per piece.

This formula is suitable for steel pipe bend as well.

Calculate 90 Degree Steel Pipe Elbow by Chart

Compared to formula, calculating by weight chart is a fast and easy way that is very useful in practice, the things you need to do is to find the value according to elbow dimensions. But we still use formula because it can be used for special thickness that we can’t find in the chart.

This chart are made based on Carbon Steel 90 Degree Long Radius Butt Weld Elbow Fittings, but it is also suitable for stainless steel and alloy steel pipe in views of they are little different in weight. 45 degree steel elbow is calculated in the same way as formula, and short radius elbow is calculated by a simple multiplication.

90 Degree Long Radius Butt Weld Elbow Weight in kg

 

DN NPS 10S 20 STD 40 XS 80 100 120 140 160 XXS
15  1/2 0.06 0.08 0.08 0.1 0.1
20  3/4 0.08 0.11 0.11 0.13 0.13
25 1 0.13 0.15 0.15 0.21 0.21 0.25 0.26
32 1 1/4 0.21 0.25 0.25 0.36 0.36 0.42 0.64
40 1 1/2 0.3 0.39 0.39 0.52 0.52 0.65 0.93
50 2 0.47 0.66 0.66 0.96 0.96 1.33 1.61
65 2 1/2 0.79 1.37 1.37 1.8 1.8 2.33 3.43
80 3 1.16 2.19 2.19 2.87 2.87 3.83 5.25
90 3 1/2 1.55 2.96 2.96 4.06 4.06
100 4 2.02 4.13 4.13 5.6 5.6 8.03 10.2
125 5 3.46 6.89 6.89 9.62 9.62 14.7 17.6
150 6 4.98 10.7 10.7 16.5 16.5 19.5 24.2 23.1
200 8 9.57 16.5 21.6 21.6 31.6 31.6 36.3 43.3 48.3 53.3 51.7
250 10 16.7 25.8 37 37 49.9 60.7 68.6 79.5 92.8 103 92.8
300 12 25.9 36.1 56 61 71.6 97.4 115 134 149 171 134
350 14 34.7 60.2 71.4 85.1 92 139 163 188 212 236
400 16 45.4 78 93.6 121 121 200 235 274 319 350
450 18 56.2 87.7 119 176 153 287 334 392 440 495
500 20 82.2 147 147 232 190 396 457 528 609 676
550 22 99.6 178 178 230 515 594 694 790 886
600 24 136 212 212 377 275 635 786 919 1033 1160

Formulas for 90 Degree Short Radius Elbow 

90 Degree Short Radius Elbow

90 Degree Short Radius Elbow

  • 90 Degree Short Elbow = 90 Degree Long Butt Weld Elbow * 0.9
  • W=0.387 * S*(D – S) * R / 1000

For example, you have a DN100 Sch10S 90 Degree Long Radius A312 Gr.316 Elbow, according to the following chart, its weight is 2.02 Kg.

45 Degree Elbow Formulas

  • 90 Degree Short Elbow Weight = 90 Degree Butt Werld Elbow Weight * 0.56

So the 45 degree elbow in above same size is 2.02 * 0.56 = 1.13 Kg.

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