Pressure Thrust
Pressure Thrust
(OP)
Dear All
I am modelling a simple piping system in Autopipe which basically consists of a series of piping runs from a steam storage vessel to three headers i.e. three pipes separately exiting the vessel to each of the headers. In the middle of each of the piping runs is a valve. When I model the piping runs with two piping runs pressurised and one with a valve closed so that on the closed valve leg the vessel side of the pipe is pressurised and on the header side the pipe is a zero pressure do i need to place an applied load at the centre of the closed valve to simulate the pressure thrust on the closed valve.
Regards
Bogu
I am modelling a simple piping system in Autopipe which basically consists of a series of piping runs from a steam storage vessel to three headers i.e. three pipes separately exiting the vessel to each of the headers. In the middle of each of the piping runs is a valve. When I model the piping runs with two piping runs pressurised and one with a valve closed so that on the closed valve leg the vessel side of the pipe is pressurised and on the header side the pipe is a zero pressure do i need to place an applied load at the centre of the closed valve to simulate the pressure thrust on the closed valve.
Regards
Bogu





RE: Pressure Thrust
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure Thrust
I think it's neccesary.
Greetings
RE: Pressure Thrust
The answer is No.
RE: Pressure Thrust
http://c
This forum is run by Bentley and I have found it extremely usefull for such questions. There is nothing quite like getting the answer straight from the horses mouth.
DSB123: I believe your statement is only correct if you turn on the option to evaluate pressure extension and include axial force.
Just my two cents worth
Always remember, free advice is worth exactly what you pay for it!
RE: Pressure Thrust
There is no difference between having a valve closed in a piping system and the end of a header blanked off with an end cap. You don't input a pressure thrust force at the end of a header. The internal pressure causes the longitudinal pressure in the pipe which is automatically calculated by any pipe stress program. If you input an axial pressure thrust force then you are "double dipping" on the effective axial stress in the pipe.
RE: Pressure Thrust
If there is equal pressure, a pressure load on either side of the valve would effectively cancel and the result would be end cap loads at the end caps only.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure Thrust
RE: Pressure Thrust
Tools Kit:
How to Predict Thermal-Hydrulic Loads on Pressure Vessel and Piping, Frederick J. Moody, Mechanical Engineering Department San Joes University
RE: Pressure Thrust
Thanks for the backup. You seem to be on the same wavelength as me.
LSThill,
What is a Hydrulic Load? and where is San Joes University? Also how does your post answer the question?
RE: Pressure Thrust
No problem there. I used the term "axial force" rather than your "longitudinal stress". The only difference I can see between the two terms is your's is divided by Steel Area.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure Thrust
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure Thrust
It must be something they learn at university.
RE: Pressure Thrust
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/