Water pressure in different shaped tanks

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SUMMARY

The discussion centers on the water pressure experienced by an Equipment Under Test (EUT) in two different tank setups for IP67 rating compliance. The first setup (Fig A) involves submerging the EUT at the bottom of a tank, while the second setup (Fig B) uses a thin pipe leading to a closed chamber, maintaining the same overall water depth. Despite the different configurations, the pressure on the EUT remains consistent due to Pascal's Law, which states that pressure in a fluid at rest is exerted equally in all directions. The pressure can be calculated using the formula P = ρgh, where P is pressure, ρ is the fluid density, g is the acceleration due to gravity, and h is the height of the fluid column.

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jlj
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For an IP67 rating (http://en.wikipedia.org/wiki/IP_Code), an electrical enclosure must be submerged to 1m for 30 minutes with no water ingress.

A basic test setup is shown in Fig A with the EUT ( Equipment Under Test) placed at the bottom of a tank.

attachment.php?attachmentid=71439&stc=1&d=1405689996.jpg


An alternative test setup was proposed to me, as shown in Fig B.
This setup has a thin pipe into a closed chamber, with the same overall depth of water.

I want to say that the pressure on the EUT is the same with the two setups, but my intuition says otherwise.

So, does Fig B result in the same water pressure on the EUT as Fig A? Why?
 

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