Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Groove dimension for Internal and External pressure (Vaccum)

Status
Not open for further replies.

Jezovuk

Mechanical
Dec 13, 2010
57
DE
Hello!
I'm constructing a pressure vessel which is intended to work with both- internal pressure (4 bara) and vacuum (~0,2 bara)- (not simultaneously of course).
The vessel have normal flange and cover (static- axial sealing).
When i look at the catalogs, manufacturers always separate internal and external pressure applications so i can not find any recommendations for groove dimension in this case.

I would appreciate the answer. Thanks in advance.
 
Replies continue below

Recommended for you

Maybe O-ring is not the best solution when dealing with both vacuum and internal pressure?
Did anyone had a similar problem?
 
O-rings can handle pressure in either direction and with the direction changing. With changing directions, it is more important to design the groove to tight tolerances to minimize the o-ring movement that will occur. The movement will cause more wear on the ring.
 
Compositepro, thank You for your answer!
That means that for example for O-ring ø188x4 (188- internal diameter) i need a groove ø196/ ø188? (with standard depth)
I am asking that because every O-ring manufacturer recommended that a groove should not be filled more than 85% or significant damage on O ring can occur.
 
The actual diameters of your groove will depend on your cross sectional width of your o-ring. Also is this a face o-ring or on a shaft/hole?
If you have a copy of BS1806: 1962 this will give you the dimensions you need, alternatively I just found this online www.applerubber.com/src/pdf/seal-design-guide.pdf

If it was me I find 3.53 mm o-rings work well around the pressure you are talking about.

Also I generally have the ID machined slightly bigger than the ID of the O-ring, this stretches the oring a bit and just helps hold everything in place during assembly
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top