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Engineering Stack Exchange

Questions tagged [seals]

46 questions
6
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3 answers

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 flat washers might be easier to design for if you…
carveone
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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 backup rings that surround it. Thus, the thicker the…
LSUEngineer
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2 answers

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 to friction. The adaptor should seal in the…
Oliver Walters
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2 answers

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 designer who doesn't have any calculations to show…
Petrichor
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3
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2 answers

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 use as little electrical input as necessary so I will…
tyler a
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5 answers

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 something that is weatherproof enough so I can keep…
concealed curry
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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 (if it had been backfilled) and through an approx…
egg
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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 which one to use. Can you please explain the…
saravana
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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 to a public authority for approval, or seal…
Anthony Mastrean
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1 answer

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 mold and then topped with an aluminum piece.…
Lilly Whelan
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1 answer

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 Aluminium tubes generally have the far end…
jet457
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6 answers

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 good sealant for this?
Misha M
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2 answers

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 all weather conditions, so I'd like to make the…
MaggieMay
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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 raised up and down using pneumatics. When the chamber…
ashur668
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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 "phasing out" of the drawing, and then drawing the…
user110391
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