Modelling Pump Nozzles
Modelling Pump Nozzles
(OP)
Hi there piping stress analysts
I'm new to this field of mechanical engineering(I've started working in this field last year) so there are a lot of things I still need to learn and understand, and I'm hoping that you guys can help me along this path. Currently I'm trying to model piping connected to a centrifugal pump which isn't fixed to a ground(the pump is connected to the skid and the skid is supported by legs which are not fixed to the ground so the whole thing can move due to thermal growth of piping connected to a pump).
Can anybody give me an idea or better yet show me through an example the best way to approach this problem.
I would be very grateful if someone could help me with this matter.
Thanks in advance.
I'm new to this field of mechanical engineering(I've started working in this field last year) so there are a lot of things I still need to learn and understand, and I'm hoping that you guys can help me along this path. Currently I'm trying to model piping connected to a centrifugal pump which isn't fixed to a ground(the pump is connected to the skid and the skid is supported by legs which are not fixed to the ground so the whole thing can move due to thermal growth of piping connected to a pump).
Can anybody give me an idea or better yet show me through an example the best way to approach this problem.
I would be very grateful if someone could help me with this matter.
Thanks in advance.





RE: Modelling Pump Nozzles
Modelling is simple, but it seems like you have a rubbish piping design.
What are the boundary conditions ?
Are there any fixed points ?
Can you be sure that thermal expansion will not cause localised gross deformation due to lack of position control ?
RE: Modelling Pump Nozzles
I'm sending you a photo of the actual piping arrangement of the above mentioned pump. You will see from the photo what I'm talking about. This kind of piping arrangement, or should I say piping installation procedure for centrifugal pumps is often preformed by my client. They have this installation practice where they let the pump move freely (pump will adapt to the thermal growth of the piping by moving from the installation position to the operating position) thus decreasing the stress, and forces and moments on the pump nozzles. Also, as you can see from the photo, they have an anchor on the suction side of the pump (usually located as near as it can possibly be to the suction nozzle) so that they ensure that the pipe doesn't move to "much".
I hope this will give you a clearer picture of the situation I have.
RE: Modelling Pump Nozzles
RE: Modelling Pump Nozzles
Do you have maybe an example of how to do this in Caesar II correctly?
RE: Modelling Pump Nozzles
RE: Modelling Pump Nozzles
my oh my what a wonderful day. What additional information have you given above and beyond my response apart from friction factors for concrete which are questionable due to the type of adjustment supports on the pump skid.
RE: Modelling Pump Nozzles
If a pump assembly is not anchored into concrete pad, does it vibrate all the time?
It will destroy the pump!