Questions tagged [seals]

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4answers
54 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
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2answers
1k views

What is the difference between washer and O-ring? what is their advantages over the other?

I am designing a hydrophone, from the piezo buzzer. To hold the circular piezo plate, I have designed a mechanical fixture. I need to use washer/o-ring to make it leak-proof. I am confused about which ...
0
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1answer
56 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 ...
1
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1answer
36 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
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1answer
39 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 ...
0
votes
1answer
39 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 ...
2
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1answer
44 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 ...
2
votes
6answers
135 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 ...
1
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0answers
311 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 ...
0
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0answers
57 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
votes
2answers
488 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 ...
0
votes
1answer
81 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
3answers
1k 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 ...
2
votes
1answer
221 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 ...
1
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1answer
77 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 ...
1
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0answers
26 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 ...
1
vote
3answers
487 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 ...
2
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2answers
1k 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 ...
3
votes
2answers
620 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 ...
3
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5answers
877 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
0answers
45 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 ...