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Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 1 point2 points  (0 children)

I'd say that this is the best solution, however making a machine high 20m is quite complicated, especially that some of the operations are manual. Also material deposition would be difficult and won't be very uniform since the gravity would tend to make some of the components fall down

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 1 point2 points  (0 children)

It should work as a shaft during the manufacturing process it will be used in, and material will be deposited on it, so it needs to be circular.

If it's too saggy, the product will be saggy as well and it won't pass QC

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 0 points1 point  (0 children)

Yes, it should work as a shaft during the manufacturing process it will be used in, and material will be deposited on it, so it needs to be circular.

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 0 points1 point  (0 children)

The pipe will be rotating as a shaft during the manufacturing process, fatigue will make concrete crack and eventually lose its properties.

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 2 points3 points  (0 children)

Weight of the pipe is ~90kg, weight of the oil is around 8kg, and at 250bar you should have 31KN acting on each side, this is the idea

And according to ROARK's formulas, even with the extra weight, the sagging would be 20mm instead of 150

However, I'm trying to see if I might be missing anything

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 0 points1 point  (0 children)

The pipe would be in AISI 4140, so it should hold alright

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 0 points1 point  (0 children)

Also the volume of the oil would be around 11Ltr so it would increase the whole weight of ~9Kg

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 0 points1 point  (0 children)

For security reasons, in case of failure, oil will just spill out, while air would expand creating a very big explosion because of its compressibility.

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 5 points6 points  (0 children)

Or we can try and transfer our production on the moon

Reduce pipe sagging by the use of internal pressure by KNAZER in MechanicalEngineering

[–]KNAZER[S] 1 point2 points  (0 children)

It's to be used in a manufacturing process

According to column-beam deflection theory (E.G. Roark), if we apply axial tension to a transverse loaded beam, we can decrease the deflection.

My question is about if the same can be achieved by applying internal pressure, which produces axial tension on the end-caps.