Questions tagged [seals]
The seals tag has no usage guidance.
45
questions
0
votes
1
answer
36
views
Figuring out thread (neck finish) for bottle cap
I've done a fairly large amount of googling on two different occasions trying to figure out what neck finish I have on a particular bottle thread I have here.
I'm in europe and this is for a plastic ...
- 99
0
votes
0
answers
29
views
Temporary upgrade of IP67 servo motor to IP69K
I have this IP67 rated servo motor
and I would like to test it on a device, which undergoes IP69K washdown (once daily high-pressure, hot jet with cleaning agents used in food processing plants). The ...
- 155
0
votes
0
answers
19
views
Straight Thread Seal Performance
Is it possible for straight threads to create a hydraulic/mechanical seal without the use of o-rings or sealants? From what I've read, in the oil industry buttress threads are used, in my application ...
- 1
0
votes
1
answer
36
views
How can I anchor a rubber sheet that will be stretched?
I am designing a cylindrical container that will be filled with water. One end of the container will be solid with flow port and the other end will be a 3mm rubber sheet. I want to oscillate the ...
- 3
-1
votes
1
answer
18
views
What is the explanation of why does gasoline leaks from a bearing seal but oil does not?
The above is a bearing with rubber seal. Such bearing is used in automotive engine. With that rubber seal, the lubricating and cooling oil inside the engine the oil does not leak. But when the oil is ...
- 219
-1
votes
1
answer
40
views
Compound to replace o-ring
I have an aluminum cooling plate with a water path inside. The structure is simple- one part with a snake-like cut and a flat cover. To seal this thing I have designed a cut for an o-ring. The problem:...
- 111
1
vote
1
answer
42
views
Improving O-Ring/flapper valve injection mold ->non-engineer
I make specialized flapper valves that are similar to O-Rings. The current model uses aluminum sheets as base disks that adhere to the rubber (2 part urethane). The rubber is poured into the waxed ...
- 38
0
votes
1
answer
160
views
Is it possible to seal a perfectly smooth surface?
I've heard that a surface roughness needs to be within a defined range, but in theory, is it possible to seal a perfectly smooth surface? E.g. with an o-ring, static or dynamic?
Intuition tells me ...
1
vote
0
answers
20
views
Is seal water/lubriaction oil for equiptment shown in P&IDs? If so, how to show it? (ISO)
Given the sheer amount of pumps, adding seal water lines would complicate things a lot. One alternative would be to draw the lines coming the pump that pumps the seal water, and just symbolize them &...
- 155
0
votes
0
answers
43
views
What type of sealants are used to seal vacuum chambers?
I'm building a vacuum chamber and I want to seal it
It's a 200mm^3 acrylic box
What type of sealant should I use?
For the door I guess it has to be something else then the walls because it need to be ...
- 115
1
vote
0
answers
68
views
Sealing of non-circular cross sections
I have to mate two sections of something that could be reasonably approximated by a tube, though the material is stainless steel, and the cross-section is very non-circular, so I cannot use an o-ring. ...
- 121
0
votes
4
answers
205
views
When using an o-ring as a face seal, are the faces flush together?
I'm using an o-ring in a face seal, external pressure configuration as a seal between two metal parts. Are the two faces being compressed and sealed going to be flush together or will there be a gap ...
1
vote
1
answer
435
views
Determine applied force due to torque
I'm hoping for some clarification regarding converting torque to force at point of contact.
I'm tightening some threaded components, the end faces of each are machined and will form a metal-metal seal ...
- 65
0
votes
2
answers
40
views
Gas Seal for slowly turning shaft
I am working on a small waste treatment project where there is a small mixing vessel (about 5 liters - more or less 20cm diameter). The mixing process produces methane gas which shouldn't escape the ...
- 24.3k
0
votes
1
answer
84
views
How to stop the leakage from the design?
I have the design attached. it is like a water cap design. I want to rotate the lid clockwise to seal the circle container. However, I noticed that when I shake the container, water leaks. Note, the ...
0
votes
2
answers
54
views
How to prevent water from leaking?
I am making a sandwich design. I designed two parts that fit well together and assembled on Solidworks.
Top part:
bottom part:
The two parts are attached like two LEGO pieces. I want to pump water ...
4
votes
2
answers
200
views
Making a radial (only) seal inside a small tube
I'm trying to make a adaptor to fit a nozzle about 5mm wide which only applies pressure radially during insertion. Pushing in a standard O Ring would apply some force axially up or down the inlet due ...
- 337
1
vote
3
answers
2k
views
How do british standard pipe parallel (BSPP) (G) threads seal?
I realize that there must be some sort of o-ring, gasket, or washer, but from an engineering standpoint it is not clear how to know what fitting will seal to what without having the parts in front of ...
- 7,904
2
votes
1
answer
173
views
Why are aluminum tubes folded at the end
I've noticed that aluminum squeeze tubes have a fold at the end. The fold is not the seal of the tube, as I can unfold and see the seal on the very end of the tube once unfolded. Wikipedia states that ...
- 123
3
votes
0
answers
63
views
water leak through subterranean cable penetrations in concrete
See the image below for the detail of 4 no. cable ducts that run from a trench in a raft foundation (on the left) through an approximately 1 m square penetration in the raft foundation, through soil (...
- 857
0
votes
1
answer
147
views
Help identifying seal/gasket
I need to identify the seal/gasket shown below so I can order a replacement. I can measure the OD, ID and Height, but I'm not sure what to call it to narrow down my search.
What type of seal is this? ...
- 109
0
votes
1
answer
294
views
How to properly fit almuminum glass window without leakage?
I got a brick-wall house. The wall is 25cm thick. I want to add windows. There are 2 ways of adding a window:
Adding the window on the inside side of the wall, so that if the aluminium frame of ...
-2
votes
2
answers
2k
views
Why do Nescafe's (and others'?) instant coffee jars have an inner seal with no "grip" for easy removal? [closed]
For a number of years now, I have been buying instant coffee products. Since the main brand has been Nescafe, this question is specifically about their products, even though I vaguely recall that the ...
1
vote
1
answer
58
views
How to select the correct Bolt/screw Torque for sealing?
My coworkers and I are finally testing our agriculture sensor on the field. As you can imagine, the moisture and dust are important variables to keep aside from the electronics inside our product. ...
- 155
0
votes
4
answers
88
views
bearing keeps burning seals
The front shaft support bearing on my front deck lawnmower keeps burning out its seal.
Typical scenario: PTO coupling catches long strands of grass which wraps around the PTO coupling, and also ...
3
votes
3
answers
10k
views
What is the difference between washer and O-ring, what are their advantages of one over the other?
I am designing a hydrophone, from the piezo buzzer. To hold the circular piezzo plate, I have designed a mechanical fixture. I need to use a washer/o-ring to make it leak-proof. I am confused about ...
- 33
0
votes
1
answer
93
views
Can an enclosure be water tight and NOT air tight?
I am trying to create an air tight cable exit system for a fuel tank.
Basically, an instrument is to placed in the tank, with its cable exiting through the top of the tank. This exit point needs to ...
- 113
1
vote
1
answer
58
views
Are tube fittings a feasible way to create tight seal?
I'm doing an experiment where 2 electrodes are inserted into 2 openings in a cylinder holding electrolytes to measure its impedance. We want the openings to be tightly sealed because the cylinder ...
1
vote
1
answer
61
views
Hermetic Cable Seal With Space Limitations
I have an application wherein I need a hermetic seal at cable exit points from a plastic housing. The cables are not removable. I'd like to achieve this seal using the plastic housing itself by ...
- 13
0
votes
1
answer
50
views
Issues creating a high pressure chamber for corrosive solution
I'm trying to do an experiment on high pressure's effect on the electrical impedance of a really corrosive solution. I'm aiming for at least 2,000 psi with a pressure chamber but the only material I ...
1
vote
1
answer
100
views
When using digital signatures, what does "capable of verification" mean?
Numerous state regulations adopt the NCEES model language for the use of digital signatures. This language says, among other things, that the signature must be "capable of verification." It is not ...
- 1,675
2
votes
6
answers
673
views
How would you seal a hole in an HDPE container that's in -20C environment
I have a temperature sensor in a -20C freezer. The probe is going into a bottle filled with propylene glycol solution. I want to seal the hole where the probe is inserted into the bottle.
What's a ...
- 123
4
votes
2
answers
2k
views
How Can You Calculate Force to Overcome Friction From an O-Ring Seal?
I essentially have a piston in a tube that is sealed with an O-Ring and actuated with a solenoid.
The friction of the O-Ring however, is higher than estimated (guessed as far as I can tell) by the ...
- 498
0
votes
0
answers
172
views
O-rings: Why a torus?
O-rings are very common components in all kinds a machinery used to, say, keep a fluid from leaking from one side of a piston to another inside a cylinder. But why exactly are O-rings tori? Why are ...
- 2,239
2
votes
2
answers
2k
views
Sealing a rotating shaft in a 3D-printed part
I need to seal a rotating shaft that protrudes through a wall in a 3D-printed enclosure I am designing for a school project. The enclosure is for what will be a small generator that will be used in ...
- 21
0
votes
1
answer
220
views
O-ring compressive force
Is there formula to calculate the compressive force required to achieve x% of squeeze in an O-ring? I have referred the Parker O-ring and Apple Rubber Handbooks, but they provide just approximations. ...
6
votes
3
answers
3k
views
O-Ring vs flat washer for air seal
I'm interested in whether a flat rubber washer or equivalent is good enough to replace an o-ring in a low pressure application (edit: I meant low pressure differential. My bad.). The reason is that ...
- 347
3
votes
2
answers
2k
views
When is a PE seal required?
The NSPE stresses the importance of licensing and makes several points about the seal being important.
Only a licensed engineer may prepare, sign and seal, and submit engineering plans and drawings ...
- 131
1
vote
1
answer
185
views
Helium is leaking through manometer
I have connected a 200 bar helium tank and a manometer to a pressure regulator. The end of the manometer's tube connected to the regulator is leaking. It's attached with anaerobic thread sealant, so I ...
- 111
1
vote
0
answers
31
views
What are some different sealing methods? [closed]
I'm trying to join two different parts together but it's hard trying to find the best method.
I cannot weld them because they must be able to be removed easily. I can't use any nuts or bolts because ...
- 203
1
vote
3
answers
1k
views
o-ring/gasket compressibility
I have two abs pieces that I would like to create a waterproof seal between via compressive force via fasteners like screws. How much do o-ring/gasket compress? Certainly it is dependent on the ...
- 111
2
votes
2
answers
3k
views
Series O-ring in Vacuum Application
I am working with a piece of equipment that has a vacuum sealed chamber.
The outer wall (ring) of the chamber is shown in the image below.
This ring is bolted to a bottom plate and a top plate is ...
- 58
3
votes
2
answers
1k
views
How can I make a rotating hinge airtight?
I am designing a product that requires internal mixing of a sealed container. If you need to visualize the container, imagine some quasi-oil drum that holds about 20 L of fluid.
I am looking to ...
- 65
3
votes
5
answers
1k
views
Best way to make a sealed container for a long term storage of a USB drive?
I'm unsure if this is the correct community, so feel free to move it if you feel it's in the wrong area.
I'm trying to develop a water-tight/sealed box for a backup flash drive. The idea is to make ...
4
votes
0
answers
66
views
Relating internal stress of an o-ring due to thermal expansion to amount of free volume in a gland
I am trying to come up with an analytical way to determine the optimal gland size that an elastomer o-ring will sit in. The amount of free space in the gland is determined by the thickness of two ...
- 53