O-Ring Groove Design
O-Ring Groove Design
(OP)
Hi All,
Does anyone have any references I can look up/purchase with regards to design of both static and dynamic o-rings grooves for high pressure (10,000psi) gas and liquid applications?
I've used the Parker o-ring handbook successfully for other lower pressure (approx 3,600psi) designs.
I'm assuming I just need to tighten up clearances on mating parts, but would like to see some other references for this higher pressure type work, unless the standard Parker grooves/clearances are ok for these pressures.
Thanks!
Does anyone have any references I can look up/purchase with regards to design of both static and dynamic o-rings grooves for high pressure (10,000psi) gas and liquid applications?
I've used the Parker o-ring handbook successfully for other lower pressure (approx 3,600psi) designs.
I'm assuming I just need to tighten up clearances on mating parts, but would like to see some other references for this higher pressure type work, unless the standard Parker grooves/clearances are ok for these pressures.
Thanks!





RE: O-Ring Groove Design
Ted
RE: O-Ring Groove Design
For piston grove seal you will need more than just harder seal and anti extrusion component. Usually such details are not available freely. These are company's (or experts) propriety knowledge.
1. The type of anti extrusion design and material is important
2. Temperature range
3. How long it has to seal and how much leak is allowed over time (If it seals a volume).
4. Housing material and coating
5. Type of gas, sealing Helium is totally different than sealing Air, Nitrogen, Argon, etc.,
RE: O-Ring Groove Design
I think they'll ask you all of Israelkk's excellent questions, and a bunch more.
RE: O-Ring Groove Design
We intend to use 90duro o-rings in an AED compound. Will also be using PTFE or possibly PEEK backup rings.
Will discuss with o-ring vendors hopefully they will have a HP design guide they can share.
If not we will use std Parker groove dims and err on the tighter end of tolerances to give less room for extrusion.
Always open to more feedback!
Thanks.
RE: O-Ring Groove Design
I routinely spec out o ring grooves for static and dynamic applications. Also use piston seals (polypaks). What exactly is your application? Static or dynamic? Face or radial/axial? Loaded on both sides of seal or just one? Internal pressure? Acidic? Gas or liquid? For a start I would say to just tighten up the tolerances as per parker and give them a call to have them look over your design. They want to help.
Also, have you considered a metal to metal seal? It may be your best bet. See Parkers Metal to Metal Seal Design Guide for the rundown. You should have no prob sealing past 10k in either a face or axial application.
RE: O-Ring Groove Design
Basically I have a cylinder with end caps that seal on the ID of the cylinder tube via o-rings. These seals have atmospheric one side, up to 10,000psi the other.
There is also a dynamic piston. I would be looking to use crown seals in lieu of o-rings on this item, however the groove dimensions are the same. This can have up to max dP of 10,000psi, or can be 0psi dP depending on the operation of the unit.
I did find a nice table that showed recommended diametrical clearances based on pressure and o-ring duro. It recommended to reduce clearance down to approx 0.05mm for 10,000psi and 90duro o-rings.
RE: O-Ring Groove Design
https://www.parker.com/literature/Engineered%20Pol...
See Table 2-4 on page 2-5.
All of my seal designs have been done by playing with the squeeze and extrusion gaps. Typically roll with aprox .0025'' (.05mm = .002'') radial extrusion gap and get decent seals upto around 5ksi. Liquid, internal pressure, dynamic piston seals. Mind you they are in a terrible environment and I can tolerate some leak/extrusion. How critical are leaks for your system?
RE: O-Ring Groove Design
Leaks are super critical in this application. Typical use is on complex hydrocarbon streams for composition analysis, so we cannot afford to lose any light ends through leak paths.
RE: O-Ring Groove Design
RE: O-Ring Groove Design
RE: O-Ring Groove Design
However, because of the contamination issues metal seals like Swagelok VCR fittings might work better for the static seals.
Someone like HIP might already have something in their catalog that will do what you need.
http://www.highpressure.com/
RE: O-Ring Groove Design
RE: O-Ring Groove Design
Metal/metal seals are not really a viable option in this application unfortunately. We need to maintain the piston function, basically we pre-load one side of the piston at or above line pressure with inert gas, then slowly allow the other side to fill from process (at line pressure) without flashing off any light ends by bleeding off the pre-charge pressure.
We have used these seals in the past on lower pressure application (up to 5,000psi) with great success. They are very resiliant and provide great sealability.
http://www.hitechseals.com/includes/pdf/Crown_seal...
Have also used Bal-seals in the past, though they have not been as successful as crown seals.
We also need to disassemble for cleaning/servicing, so o-ring seals for the end caps is really ideal for this service as well. We've never had any real issues with gas permeation before, apart from some RGD issues on high pressure/temp streams with significant CO2 levels. Even then the static o-rings were not too bad, it was the dynamic piston seals and valve stem seals that copped a hiding.
VCR/bellows type seals unfortunately aren't going to work for us in this style of application.
Also @MechyMarco please see attached the chart I found online re clearance gaps.
RE: O-Ring Groove Design
Sounds like a clever design.
RE: O-Ring Groove Design