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# Bolts circulator pump

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### Bolts circulator pump

1. 1. Bolts in circulator pump<br />Strength calculation <br />
2. 2. Used bolts: 4 socket head screws M4x16 8.8<br />
3. 3. Strength class bolts: 8.8<br />Minimum tensile strength: 800 N/mm²<br />Rack limit: 640 N/mm²<br />
4. 4.
5. 5. Maximum pressure (p) in the circulator pump: 6 bar = 6 x 105 Pa<br />Surface (A) = r2 x π = 0,04502 x π = 0,002025 m2<br />Fb = p x A<br /> = 6 x 105 x 0,04502 x π<br /> = 3817 N<br />FVmax= 3 x Fb<br /> = 3 x 3817<br /> = 11451 N<br />Divided over 4 bolts<br />11451 / 4= 2863N <br /> =2,863 kN<br />The tension of a M4 bolt will be around 3-5 kN (see tension table next slide)<br /><ul><li>According to the calculations the right bolts were chosen</li></ul>(I had no information about the friction coefficient)<br />r = 0,0450 m<br />
6. 6. Tension table<br />(I could not find a tension table with bolts smaller than a M5, so I had to estimate the tension for a M4)<br />M4<br />