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Hello!! I would like to confirm

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gotothesky

Mechanical
May 14, 2019
57
Hello!!

I would like to confirm some mechanical matter with you.
I am very sorry that I can't find out exact design procedure of hinge design for door.
The center of gravity is not at the center of door... During design, we have to consider eccentric effect of center of gravity of door during design....

I just prepared hinge calculation procedure as attached for a hinge for eccentric door....
If you can, I am highly appreciating your kind comment....

Regards,
S.W.Moon

See attached file.[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1584857528/tips/HINGE_CONFIRMATION_sbs7e4.pdf[/url]
 
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And, Please confirm whether Eccentric effect has to be considered or not for Moment of Lugs........
 
Is that diagram vertical (with F being weight of the door) or horizontal?
If vertical, you can't assume each hinge takes equal loading for design.
I don't see where the Fa and Fb equations come from.
 
Hello,
I think you got it right for the Fv,
But not for the horizontal forces.
How is C is not considered in the equations.
It’s like you are saying that no matter how far the door is you will get the same horizontal forces on A and B, which is wrong.
In my opinion Fa=Fb=+-fxc/(a+b)so they actually become zero in equilibrium (newton’s)
I am assuming you are calculating these forces for the condition when you are actually opening the door.
Oh and plus i think the bending moment isn’t correct, it should be FxC.

Detailing is a hobby,
 
to r6155

Davit is not acceptable due to interference problem at top section.
Hinge construction should be considered.
 
to Jay

I understand the case, Fa = -Fb is only applicable Door's COG is located at center of it.
Could you provide the exact calculation procedure of Hinge with eccentric COG of door???
I need to confirm the hinge for eccentric door as attached.

 
If the summation of all horizontal forces is not equal to zero, that means the door have an acceleration in the direction of the bigger between fa, fb)
Regards,

Detailing is a hobby,
 
See PIP VEFV1116 Manway Hinges. Eccentric or not, is the same.
If you have to do this, then there is something wrong with the design of this PV. And other problems may appear.

Regards
 
If the only material between the hinges and the door are the double horizontal bars, you have other problems to look at. I agree with Jay that the hinge forces Fa and Fb are equal and opposite, and are equal to F x C / ( A + B ). Is the CG in the same plane as the paper this is written on, the same plane as the hing pin or is there some other eccentricity involved??
 
to r6155

Fa and Fb are for Hinge Pin Calculation...
And, These are not big impact to hinge size...
Actually, The moment reacting on the hinge is more serious.
I will apply Fa = Fb = F x C / (A+B).

And, I decide two hinges to be attached at same distance from COG of door after calculating COG of it......

Thank you everyone...
Regards,
Moon
 
gotothesky
what is the weight of the blind flange?, and what is the diameter of the pin?.......general dimensions?

Regards

 
Dear r6155,

Fracnkly speaking, I am not confident for hinge calculation.
The main reason is that I could not find out Calculation procedure of hinge....
Just referring to internet, and all your comment and my knowledge of mechanicals....
I prepared the attached calculation of hinge....
If anyone has question or comment, I am highly appreciating....

Reagers,
Moon
 
 https://files.engineering.com/getfile.aspx?folder=7a8e54e5-32e0-4f6a-9a3a-e67bbd30124f&file=hige_calculation.pdf
gotothesky
One thing is calculation and other the reality (proportions of the parts)
As guide, see API 650 for hinge design (no calculation).
Pin dia. 10 mm – go to 20 mm
Hinge thckness 8 mm- go to 13 mm
Corrosion allowance?
Try to do a drawing with scale 1:2
Fillet welds: see AWS

Regards
 
Dear r6155,
Your request of changing Pin dia. and hinge thickness is for corrosion allowance?
Sir, I think these part installed in the outside of equipment. maybe, they will be coated with painting.
The purpose of this door in my calculation is for fire tube boiler reversing chamber door.
Fire tube boiler has maintenance door in front reversing chamber to check tubes.

My interest is only for checking whether my calculation procedure is reasonable or not.

Thank you in advance.

Regars,
Moon
 
gotothesky
If I see an engineer in my company wasting time on this calculation, he is fired.
I¨m not your checker. I just look at the concepts
Corrosion on carbon steel should always be considered (also environmental corrosion). Surface protection is the first barrier, corrosion must be added anyway.
All calculations must mention corrosion, even if it is zero.
Pin is not necessary. Use bolt and nut.

Regards

 
Dear r6155,
Thank you for your replay. I will consider your comment, and I am highly appreciating yours.
Thank you.

Regards,
Moon
 
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