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calculation sits oring

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papero

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Good morning to all, I hope I am not ot because I am not practical of this forum, I would have a problem with oring locations, I should use an oring with size 1.8x1 and must resist a pressure of 130 bar, you would know how to indicate the size of the shaft and cylinder with tolerances? the work that must carry out is static, as it will work in salt water I used oring 70/75 shror I tried to look at the online catalogs of some producer but not being my field I am not very clear and I do not want to miss ... I thank in advance all those who want to help me.
Hi.
alessandro
 
do a sketch of where it should be inserted and in which direction the pressure works. without this information it is difficult to help you.

p.s. 130 salt water bar? Are you going to dig at the bottom of the Marian pit? :giggle:
 
papero said:
Good morning to all, I hope I am not ot because I am not practical of this forum, I would have a problem with oring locations, I should use an oring with size 1.8x1 and must resist a pressure of 130 bar, you would know how to indicate the size of the shaft and cylinder with tolerances? the work that must carry out is static, as it will work in salt water I used oring 70/75 shror I tried to look at the online catalogs of some producer but not being my field I am not very clear and I do not want to miss ... I thank in advance all those who want to help me.
Hi.
alessandro
Click to expand...
try looking for the parker's o-ring manual, it is done very well and also explains how to choose and size o-rings and locations.
 
Here it is, practically I have to make the crown of a watch and on the axis of charge I use these oring.
I hope it's clear the sketch I made.
:roflmao: Yeah, but I'm just sending him in. I'm not going to 1000 meters under water.
 

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papero said:
:roflmao: Yeah, but I'm just sending him in. I'm not going to 1000 meters under water.
Click to expand...
Also because I think that after the tests of comex 500 meters, no one went further down...

the design you posted is good for the application.
you have to make the conical invitation to avoid pinching the o-ring and follow the directions of the manufacturer regarding the size of the gorges and the finishes of the parts.

attention to the finishes: are the first cause of problems for these estates.

on the net you find a lot of material, like what you were advised above.
choose the supplier first and then use its documentation.

post the quoted design and references to the documentation, so you will have confirmation from the expert users of the forum.
 
exxon said:
Also because I think that after the tests of comex 500 meters, no one went further down...

the design you posted is good for the application.
you have to make the conical invitation to avoid pinching the o-ring and follow the directions of the manufacturer regarding the size of the gorges and the finishes of the parts.

attention to the finishes: are the first cause of problems for these estates.

on the net you find a lot of material, like what you were advised above.
choose the supplier first and then use its documentation.

post the quoted design and references to the documentation, so you will have confirmation from the expert users of the forum.
Click to expand...
Okay.
 
I think it's okay.
the comments below are only for verification.

1) I do not see radiation on the bottom of the quarries for the o-rings. 0.2 mm would be fine.

2) I do not see the conical invitation on the hole. without the invitation, it serves a specific tool for mounting.

3) I do not see surface finishing indications. I think I read comments in text, but it would be better to indicate numerically the value.

4) I would have made quarries from 1.6 instead of 1.5. it could go well anyway; make a test in conditions of maximum material and see if the rope has space to expand sufficiently.
 
exxon said:
I think it's okay.
the comments below are only for verification.

1) I do not see radiation on the bottom of the quarries for the o-rings. 0.2 mm would be fine.

2) I do not see the conical invitation on the hole. without the invitation, it serves a specific tool for mounting.

3) I do not see surface finishing indications. I think I read comments in text, but it would be better to indicate numerically the value.

4) I would have made quarries from 1.6 instead of 1.5. it could go well anyway; make a test in conditions of maximum material and see if the rope has space to expand sufficiently.
Click to expand...
What do you mean by n4?
 
papero said:
What do you mean by n4?
Click to expand...
in your design, the width (in the direction of the rotation axis of the crown) of the seat for the o-ring is 1.5 mm (+0, -0.10 mm). I would have made it wide 1.6, with a little more radius at the bottom. I repeat, just to give you the point for a check. I don't think these differences involve anything at the end of the estate.

p.s. several years ago I designed the container for a technical underwater computer. the specifications were "only" 300 msw. but mine was an easier task because the container was plastic filled with oil and welded to ultrasound.

is that crown destined to turn even in dive?
 
exxon said:
in your design, the width (in the direction of the rotation axis of the crown) of the seat for the o-ring is 1.5 mm (+0, -0.10 mm). I would have made it wide 1.6, with a little more radius at the bottom. I repeat, just to give you the point for a check. I don't think these differences involve anything at the end of the estate.

p.s. several years ago I designed the container for a technical underwater computer. the specifications were "only" 300 msw. but mine was an easier task because the container was plastic filled with oil and welded to ultrasound.

is that crown destined to turn even in dive?
Click to expand...
no dive must not turn, but I think it does not affect manual rotation or is it wrong?
 
papero said:
no dive must not turn, but I think it does not affect manual rotation or is it wrong?
Click to expand...
Well... 12.5 kg pushing on that crown, something they do.
What did you put to counter the axial thrust?

(Certainly, you might wonder who would turn that crown to bare hands at 1000 meters under water, but after all the avangers that have ripped us, you never... ;)
 
exxon said:
Well... 12.5 kg pushing on that crown, something they do.
What did you put to counter the axial thrust?

(Certainly, you might wonder who would turn that crown to bare hands at 1000 meters under water, but after all the avangers that have ripped us, you never... ;)
Click to expand...
I didn't put anything, but actually on the inner part of the crown (between case and crown) there's pressure there too so there's a small contrast actually or is it wrong?
 

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