Calculation of flange weight
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A few days ago I saw a post online regarding the theoretical weight calculation for flanges. The formula used is: (outer diameter * outer diameter – inner diameter * inner diameter – bolt hole diameter * bolt hole diameter * number of holes) * 0.616 * 0.00001 = theoretical weight. However, the values obtained using this formula are always higher than the theoretical weights given in reference books. The actual weight of a flange corresponds to the value stated in those books, not the weight calculated by this formula. So what’s the deal with this formula? ? ?
I calculated that the flange area A = (outer diameter squared – inner diameter squared – n*bolt hole diameter squared) * 0.785 * 0.000001; the diameter is in mm, and the area is in m^2. Your formula gives 7.85A, because the density of iron is 7860 kg/m^3; 7.85 times is equivalent to 7860 times multiplied by 0.01. So your formula should calculate the relationship between the mass of an iron flange with a thickness of 1 centimeter and its various area dimensions. In practice, flanges of different pressure ratings have varying thicknesses, which results in different outcomes; moreover, the effects of the concave and convex surfaces of the flanges must also be taken into account.
How is the flange area A you mentioned measured? ? My formula is used to calculate weight
How should I push it? ? ? I still really don’t get it
It’s obvious you didn’t read my reply carefully.
The formula for calculating the theoretical weight of a flange is: (outer diameter*outer diameter – inner diameter*inner diameter – bolt hole diameter*bolt hole diameter*number)*0.616*0.00001 = theoretical weight. In other words: the flange area A = (outer diameter squared – inner diameter squared – n*bolt hole diameter squared) * 0.785 * 0.000001. The diameter is measured in mm, while the area is measured in m². In fact, the square of the diameter should be multiplied by π/4; π/4 equals 0.785. Since the density of carbon steel is 7850 kg/m³, and 0.616 = 0.785*0.785, by adding in the unit conversion factor and then multiplying by the thickness, it is possible to calculate the weight.