Summary: The design of genuinely waterproof containers is an arcane art but is reasonably doable if certain rules are adhered to which codify the underlying "magic".
Failures occur when the basic sealing rule discussed below is violated. I.e. pressure on all sealing surfaces exceeds differential pressure at all times. In many products the failure is ...
Well liners are generally made to order. One of your issues will be to find a company that can make what you want.
You will need to ensure the liner is the correct size and that it does not tear when inserted into the well, while being filled with water, or when it is being removed from the well.
You mention your wells are cased with concrete pipes. They ...
I see two ways:
I've had great experience in my pressure vessel design with a 2.3 mm thick liner of polypropylene or polyethylene. In a pinch, you can weld PVC, but I don't recommend it. Thinner stuff works as well, but the 2.3 mm allows you to place a weld bead on the edge using standard weld rod and plastic welding tools.
If not, for a pretty ...
The major factors surrounding failure points of waterproofing are, as has been said, the ingress of water around the main case opening and any I/O areas. For the main case opening, this ingress is usually mitigated by an O-ring. Due to the deformation of the O-ring under pressure, hard, 90$^\circ$ bends usually are the primary point of failure. This is the ...
If you don't care it being a little flimsy and just want quick, and the plastic is not too brittle:
Use a barbed fitting with a straight thread on the outside, e.g. #10-32 of M5x.8 (these sizes happen to be interchangable), and a sealant.
drill 4.2mm (work up size in small increments to avoid cracking)
tap hole M5x.8 (or #10-32) (with great care, ...
This sort of sliding seal is very difficult to achieve, especially when you have a square corner.
Rotary engines have this problem and tend to accept a certain amount of leakage as inevitable and design around it.
Changing the wheel profile to give it a more rounded shoulder would certainly help.
One possible solution is an expanding seal, either an ...
If you don't want to drill a hole on the box and mess around with nozzles and sealants, a solution would be to siphon water like
The only difference is that that valve is going to be at the bottom side.
The only "problem" is that you need to fill the hose. A common solution to that is
The pressure at the depth of 100m is:
$$p=\rho*h=100*1024=102400kg/m^2=10.24atm$$ Assuming 1 atm pressure inside the cabine.
As per Roark’s Formulas for Stress and Strain
WARREN C. YOUNG
RICHARD G. BUDYNAS Seventh Ed. pp 502 ch. 11 table 11.4, for a square plate with free edge supports.
$\beta=0.2874 \ for\ square$
$q=pressure, \ p $
$t=thickness,\ \alpha= ...
The wavelength of the light with the dissociation energy of epoxy phenyl oxygen is 300-310 nm. Over time, when exposed to this wavelength, it will become opaque and yellow.
The solution is simple: add a layer which absorbs strongly the UVa (it has a high absorptivity in these wavelengths), like oxanilidies, and this will inhibit the opaque degradation.
I would guess that your current epoxy changes its optical properties because of ultraviolet (UV) light coming from the LEDs. You may be able to find specialized UV-stable epoxies that don't suffer from UV. You could rethink your mechanical design and use a glass (or UV-stable plastic, or sapphire) window in front of the LED.
White LEDs are actually blue ...
For a waterproof container to be useful, you have to be able to open it and put something inside. The most likely location for failure is obviously at the points where the case opens up. This is usually dealt with by using a rubber gasket which compresses slightly when the case is closed, creating a continuous seal between the two sides. The most likely ...
Wood isn't a particularly waterproof material (it absorbs water & humidity), I would go for plastic or metal. To ensure the "waterproofness" of the case, I would suggest using an o-ring or similar foam gasket under compression, this is the best way to ensure it is sealed. Normally with o-rings, you would aim for a 20% compression.
Now, there is the ...
A lot of bearings are sealed anyway, at least to some extent, to keep the grease in and water and grit etc out. Equally the inner and outer shells are typically a press or adhesive bonded fit to the shaft/hosing so tend not to pose any inherent difficulties for sealing.
Obviously the greater the pressure difference between the inside and outside the ...
A common way to do this is to use mechanical fixings (bolts, rivets etc) and a flexible or semi-flexible gasket to provide sealing.
Here the mechanical fasteners physically hold the plate on and also compresses the gasket between the two materials to form a good seal.
Bolts are ideal for this as they allow quite fine adjustment of the clamping force so ...
At the risk of performing a pure lmgtfy, take a look at this page
An interesting quote from that page:
The operation was started in 1825 and was halted a number of times
when the river burst in and flooded the workings. Isambard Brunel was
put in charge of operations, and at one time nearly lost his life in a
flood. In November 1827 Marc’s son, ...
take note if you are talking about dropping to the deepest parts of the ocean the pressure can be as high as 15,000 psi. the Yield strength of acrylic is maybe 10,000 psi.
Your wall will be very thick! You can not use most of the thin shell based formulae you might look up.
You can take an extreme view and imagine a large block of material with a tiny ...
Being able to create a waterproof seal on a shaft would also have to take into consideration the water pressure on the outside of the assembly. In this case, waterproofing is more weatherproofing, reducing that aspect by a considerable amount.
I suggest that your waterproof bearing, unless otherwise specified, is not a water-sealing bearing. If the ...
You could make a water drain trap. Drill a vertical hole that meets the microphone hole somewhere along its length, with a drain hole sloping down for the water to escape. You could then make a step change in diameter in the mike hole (for example between the pink and blue parts in our drawing) to stop the water getting past the drain.
Since you appear to ...
I would say Thibd's answer excellent. However, one should look at the cost (including fabrication) on Monel, Incoloy 825, any Inconel or Hastelloy or Titanium . Although not "steel" they are metals that would answer the intent of the question. Also in "deep" water, corrosion of even carbon steel is not a problem because of low oxygen; but I think testing ...
Small, waterproof electric motors are commonly available as electric outboard motors that run silently on 12VDC and are used by sport fishermen and also to power small sailboats into and out of harbors. You'd convert them to saw use by removing the propeller and replacing it with a circular saw blade which has been modified to fit onto the propeller shaft, ...
I'd recommend first making a hole to fill the channels in the brick with mortar/concrete locally. This way you will effectively have a solid brick which allows for a much stronger fastening and a much larger range of applicable anchors.
The anchors you show above are all mechanical anchors, which is not the optimal solution when a waterproof result is ...
Pure weight test before and after may not be accurate as the enclosure may have absorbed some water without it entering. Apply dye around areas where ingress is possible, if it washed away there has been ingress. Depending on the volume/internal geometry of your enclosure a visual inspection is generally acceptable for IP ratings in my experience.
Tunnel linings come in a wide variety of materials and functions.
Some are just finishing precast panels covering the tunnel structure which could be an elaborate system of tie-back wires, steel frames, shotcrete.
Some are actually part of the structure, but generally not the waterproofing.
Here is a link to the design concern guide.
The solution you have suggested will not be waterproof for long. The reason is that, if you pull on the cable it will stretch and thin very slightly. This is enough to break the seal.
If you can make the space, a cable gland is the best option.
If you can't, and O-ring seal is probably the next best thing. Make sure to use a thick o-ring with some ...
How deep would a water bottle have to be submerged in the sea to burst?
It won't burst. It will be crushed.
Pressure increases by 1 bar approximately every 10 m in salt water.
Is there a good way to approximate how good an object would be at serving as a long term floatation device, like a pontoon or bouy?
Yes. 1 L of displaced water gives 1 kg (10 N) ...
Why have the hole perpendicular to the front surface?
Angle the hole so that it is slightly uphill when the screen is at the angle as shown.
Or, could you fit a membrane on the surface of the microphone and mount it closer to the front face with a larger hole for the entry rhs but smaller hole on the face lhs.
The basic formula used in analyzing thin-walled spherical pressure vessel is:
stress = PD / 4t
where P is the pressure inside or outside, D is the inner diameter, and t is the wall thickness.
t = PD / [(allowable stress of the material) * 4]
Note that this formula is only applicable if D/t >= 10
Note also that allowable stress in acrylic ...