Vivaldi M. Smith
Chemical
I have about 1640 ft pipe Carbon steel with condensate around 13000 Barrel at day. The line is operating at 150 PSIG. How long (time) it will take to build up a certain amount of pressure for a blocked flow scenario.
Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
I am trying to calculate how long it will my pipe to reach a certain pressure 1
- Thread starter Vivaldi M. Smith
- Start date
- Status
-
1
- #2
LittleInch
Petroleum
Depends on what is causing the pressure?
Could be < 1 second or hours if there is a very slow thermal locked in increase.
Much more definition of the issue required.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
Could be < 1 second or hours if there is a very slow thermal locked in increase.
Much more definition of the issue required.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
- Thread starter
- #3
LittleInch
Petroleum
Assuming you start counting from the point where your flow at the far end goes to zero and you are still pumping in at the same rate, my best guess is about 10 to 15 seconds to reach the dead head / no flow pressure for a pipe of about 300m.
You can work it out if you want using a transient simulation program, but how accurate do you want to be and why do you want to know?
The fluid will compress a little bit (Bulk Modulus) and the pipe will expand a little bit which is why the answer is >0, but it's much less than 1 minute.
You're probably looking at about 0.5% of the pipe volume to go from low pressure to dead head pressure.
But this is all very vague as you have not defined how much pressure is to be in excess of the steady state - 10 psi? 100?, 1000?, size or wall thickness of the pipe, Bulk modulus of the fluid, pump curve etc.
All of the above is based on this being 100% liquid. Throw any gas in there and the answer is different.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
You can work it out if you want using a transient simulation program, but how accurate do you want to be and why do you want to know?
The fluid will compress a little bit (Bulk Modulus) and the pipe will expand a little bit which is why the answer is >0, but it's much less than 1 minute.
You're probably looking at about 0.5% of the pipe volume to go from low pressure to dead head pressure.
But this is all very vague as you have not defined how much pressure is to be in excess of the steady state - 10 psi? 100?, 1000?, size or wall thickness of the pipe, Bulk modulus of the fluid, pump curve etc.
All of the above is based on this being 100% liquid. Throw any gas in there and the answer is different.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
You will begin seeing a pressure increase at the beginning of the pipeline in 0.5 to 1 second and probably reach maximum pressure within 4 to 5 seconds. Maximum pressure reached will depend on the liquid's initial velocity in the pipe and how fast the blockage is fully closed. Max Pressures couldreach around 1.5 times initial pressure (225 psig) more or less, probably less with condensates, but I don't know the Velocity (pipe diameter), which is important.
Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."
Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."
LittleInch
Petroleum
Context is important here.
Surge could be an issue if you are at a high velocity and close the valve quickly.
Different if you start with a closed valve then turn the pump on.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
Surge could be an issue if you are at a high velocity and close the valve quickly.
Different if you start with a closed valve then turn the pump on.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
LittleInch
Petroleum
Exactly. We know nothing but something is making it flow..
And yes, I've seen it and it's A HUGE queue
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
And yes, I've seen it and it's A HUGE queue
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
LittleInch
Petroleum
It looks like it's 0.5 miles per hour.
Current queue is over 5....
I'm not in it.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
Current queue is over 5....
I'm not in it.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
georgeverghese
Chemical
Mr. Smith is as usual, frugal with his words.
What causes pressure rise during blocked flow?
a) Solar radiation heating up the blocked in condensate, resulting in thermal expansion
or
b)Some pump upstream goes into dead head when an automated valve downstream slams closed
or something else
Either way, make an effort to describe this event, and respond to comments. Both @LI and @1503 are going round in circles trying to guess.
What causes pressure rise during blocked flow?
a) Solar radiation heating up the blocked in condensate, resulting in thermal expansion
or
b)Some pump upstream goes into dead head when an automated valve downstream slams closed
or something else
Either way, make an effort to describe this event, and respond to comments. Both @LI and @1503 are going round in circles trying to guess.
LittleInch
Petroleum
There's a dedicated you tube site run by the government. Just search "Queue tracker " on YT.
It's reached the park at the start point and loads of zig zags in there so now 5 miles and 14 hours....
PS In the abscess of data, apologies for hijacking the thread.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
It's reached the park at the start point and loads of zig zags in there so now 5 miles and 14 hours....
PS In the abscess of data, apologies for hijacking the thread.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
We're not hijacking, just passing time waiting for OP's ANSWERS.
The answer is 0.52 fps
Not joining that que!
Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."
The answer is 0.52 fps
Not joining that que!
Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."
- Status
Similar threads
- Locked
- Question
- Locked
- Question
