Calculating pressure of air pocket in a pressurized water column

AI Thread Summary
To calculate the pressure of the air pocket in a pressurized water column, it's essential to clarify the setup: a 2-inch vertical pipe, capped, containing 2 inches of air at the top and 40 psi of water at the bottom. The pressure measurement of 40 psi is taken at the bottom of the 24-inch tall pipe. As the water rises, the pressure decreases due to the height of the water column. The pressure drop can be calculated using hydrostatic pressure principles, factoring in the height of the water column and the density of the water. Understanding these elements will provide clarity on the pressure dynamics within the system.
cvsanders
Messages
2
Reaction score
0
TL;DR Summary
Calculating pressure of air pocket in pressurized water column.
Looking for some guidance in calculating pressure of air pocket in pressurized water column. Example: 2" vertical pipe, capped, with 2" of air and 40 psi water applied.
 
Engineering news on Phys.org
Welcome to PF. :smile:

Presumably the air bubble is at the top of the column, right? Where are you measuring the 40psi water pressure? At the top or bottom of the water column? How tall is the pipe?
 
Water supply line pressure is 40 psi, air is at top of 24" column, where it is being read.
 
So the 24" tall pipe has 40psi water at the bottom. How much does the pressure drop going up that water column...? :smile:
 
Thread 'What type of toilet do I have?'

Thread 'What type of toilet do I have?'

I was enrolled in an online plumbing course at Stratford University. My plumbing textbook lists four types of residential toilets: 1# upflush toilets 2# pressure assisted toilets 3# gravity-fed, rim jet toilets and 4# gravity-fed, siphon-jet toilets. I know my toilet is not an upflush toilet because my toilet is not below the sewage line, and my toilet does not have a grinder and a pump next to it to propel waste upwards. I am about 99% sure that my toilet is not a pressure assisted...
View full post »

Thread 'Thread No-Go plug gage allows 3 turns to enter. That's too many!'

After over 25 years of engineering, designing and analyzing bolted joints, I just learned this little fact. According to ASME B1.2, Gages and Gaging for Unified Inch Screw Threads: "The no-go gage should not pass over more than three complete turns when inserted into the internal thread of the product. " 3 turns seems like way to much. I have some really critical nuts that are of standard geometry (5/8"-11 UNC 3B) and have about 4.5 threads when you account for the chamfers on either...
View full post »
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
View full post »

Similar threads

How much air pressure is needed to push water up a column?
Replies
16
Views
5K
Estimating the force exerted by a water jet on a flat plate - Bernoulli vs Momentum Equation
Replies
11
Views
3K
Heat cross exchanger
Replies
3
Views
3K
Disc lifted by pressurized air in a vertical tube
2
Replies
59
Views
5K
Pressure of water exiting a hole in PVC
Replies
12
Views
3K
Force from Water Entering a Pressurized Tank with No Relief Valve
Replies
8
Views
2K
Water Pressure at the tap and practical Bernoulli equation
Replies
10
Views
6K
Why Did the Temperature Rise in a Sealed Automotive Cooling System?
Replies
18
Views
2K
Force of pressurized water exiting a hose or pipe?
Replies
20
Views
10K
Modeling Air Compression Cylinder
Replies
45
Views
5K

Hot Threads

Recent Insights

Back
Top