Questions tagged [seals]

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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. ...
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4answers
60 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 ...
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1answer
33 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 ...
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2answers
32 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 ...
1
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1answer
48 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 ...
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2answers
38 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
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2answers
179 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 ...
1
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1answer
289 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 ...
2
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1answer
65 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 ...
3
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0answers
37 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 (...
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1answer
97 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? ...
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1answer
146 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 ...
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2answers
941 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
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1answer
43 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. ...
0
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4answers
72 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
6k 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
63 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
40 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
49 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
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1answer
41 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
80 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
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6answers
361 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 ...
4
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2answers
790 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 ...
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0answers
106 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
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2answers
1k 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
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1answer
113 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
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3answers
2k 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 ...
3
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2answers
1k 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
128 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
28 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
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3answers
780 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
2k 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
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2answers
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 ...
3
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5answers
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
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0answers
57 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 ...