Skip to main content
9 votes

How did this building's windows get like this?

OP states that the staining is not always present. here is a possible reason for it: If the building is air-conditioned and has single-glazed windows, then the outside of the window glass might be ...
niels nielsen's user avatar
8 votes

How did this building's windows get like this?

To add to the other answer: When ledges protrude out from the wall then the water, and dirt, falls away from the wall surface. Also, the underside of the ledge usually has a drip channel or groove to ...
Solar Mike's user avatar
  • 15.8k
5 votes

How do I connect a 3mm water tube to a plastic box?

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 ...
Pete W's user avatar
  • 1,561
4 votes

Can we rotate the given white wheel?

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 ...
Chris Johns's user avatar
  • 15.2k
4 votes

What type of stainless steels can resist 6 months under the sea?

For this type of use and to make it simple we will calculate the Pitting resistance equivalent number. This is based upon the material composition. PREN = 1 x %Cr + 3.3 ( %Mo + 0.5 x %W ) + 16 x %N ...
Xiiryo's user avatar
  • 161
4 votes

How do I connect a 3mm water tube to a plastic box?

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 ...
NMech's user avatar
  • 24.4k
3 votes

Calculate thickness of a 1 square meter window made of acrylic in a submarine to endure 100meters

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. ...
kamran's user avatar
  • 22.4k
3 votes

O-ring compressive force

To be honest, if you need more precision than what the handbooks tell you, your best bet is to buy some o-rings and test them under the range of conditions under which you expect them to function.
DLS3141's user avatar
  • 2,145
3 votes

How wasn't Thames Tunnel flooded during construction?

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 ...
Carl Witthoft's user avatar
3 votes

Why does epoxy resin become opaque after long exposure to water and LED lamps?

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: ...
Dr.J.R.Webster Webster's user avatar
2 votes

Transmission of rotational power across a waterproof boundary

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 ...
Chris Johns's user avatar
  • 15.2k
2 votes
Accepted

How to water seal a metal plate into the wall of a plastic water tank?

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 ...
Chris Johns's user avatar
  • 15.2k
2 votes

Sealing a rotating shaft in a 3D-printed part

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, ...
fred_dot_u's user avatar
  • 7,132
2 votes

Microphone angled waterproofing

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 ...
alephzero's user avatar
  • 12.5k
2 votes

What type of stainless steels can resist 6 months under the sea?

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 ...
blacksmith37's user avatar
  • 6,144
2 votes

Material thickness to withstand Pressure

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 ...
agentp's user avatar
  • 949
2 votes

How to rotate the blade?

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 ...
niels nielsen's user avatar
2 votes
Accepted

Do PVC concrete joint water stops degrade over time? Or were they never installed correctly?

Based on limited studies, PVC can degrade underwater due to chemical and bio-microbe attacks, it can lose weight and become more fragile after an extended time. But under the same attacks, the cement ...
r13's user avatar
  • 8,184
2 votes

Do PVC concrete joint water stops degrade over time? Or were they never installed correctly?

Hydrostatic pressure is always looking for a tiny oppening, small scratches, nail holes, tiny tears, happened during the course of construction or due to wall settlement to find a way to infiltrate. ...
kamran's user avatar
  • 22.4k
2 votes
Accepted

What is the best way to fasten securely a load onto a hollow brick?

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 ...
ingenørd's user avatar
  • 1,288
2 votes

What tests are made in an Ingress Protection to verify that no water entered the enclosure?

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 ...
jko's user avatar
  • 2,347
2 votes

Are mechanical pocket watches inherently water-proof and last "forever"?

Pretty sure they are not all stainless steel. I would expect some brass and I don't think I would expect the springs to be stainless steel. Different metals with water result in galvanic corrosion. ...
DKNguyen's user avatar
  • 5,621
2 votes
Accepted

Suitable pipe suggestion required

You need a pipe rated for suction. Or use a corrugated steel inner which won’t collapse - did that for one application…
Solar Mike's user avatar
  • 15.8k
2 votes
Accepted

How bad is it if water is leaking through concrete in the lower parking levels of my apartment building?

A pipe or connection to an appliance has cracked and needs to be repaired. Even a defective toilet can leak a lot of water. Concrete structures can likely take the leak without too much damage. But ...
kamran's user avatar
  • 22.4k
1 vote

How to have a watertight or airtight pipe seal that is rotating at a radius, with a stationary junction tube?

I believe what you are describing is a not-uncommon item in process industry and is often simply referred to as a rotary joint or rotary union. These rotary joints can be configured many different ...
ChemE mang's user avatar
1 vote

When using an o-ring as a face seal, are the faces flush together?

They can be flush, but do not have to be*. At least for smaller sizes, flush is typical, because it ensures control of tolerances of the interference and compression (squeeze %). The groove has excess ...
Pete W's user avatar
  • 1,561
1 vote

When using an o-ring as a face seal, are the faces flush together?

Assuming you have a properly sized o-ring groove, then the part faces will be flush with each other.
Eric S's user avatar
  • 915
1 vote

Tunnel lining vs structural support

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 ...
kamran's user avatar
  • 22.4k
1 vote

How to properly fit almuminum glass window without leakage?

If your brick wall is constructed correctly it should have an air/moisture barrier inside the wall. Then you need to attach the flashings of your aluminum window to that barrier which is usually a ...
kamran's user avatar
  • 22.4k

Only top scored, non community-wiki answers of a minimum length are eligible