I worked on a larger size, low temperature water pump system and found the thermal pump nozzle loads are over about 10 times of pump allowable, but the potential pump nozzle displacements are only 10 to 20 thou by using CII. These small values are within the piping fabrication and installation tolerance. Is that an issue? I appreciate any practice way to deal with this kind of issues.

Thanks

I see no connection regarding the two issues.
But let's try this: do as you think is appropriate(ignore the results as per your consideration) ask client to give feed-back, then post the results here.
I saw many peoples thinking that we can ignore eccentricity of reducers, thermal issues and so on...... Maybe we are very conservative.

Best regards,

move a 10000 ton lb weight .001 off its supports guess what you have all the weight!!!

move a 10000 ton lb weight .001 off its supports guess what you have all the weight!!!

I’d like to clarify the potential movements mentioned are the piping thermal movements at the nozzle connection point without any constraint at this point.

We debate for some possible solutions.
1.Re route piping to make the piping flexible. But it is quite difficult for large size pipe and uneconomic.
2.Use actual pump and piping anchor stiffness for re-analysis. This doesn’t help to much as the large piping and pump system.
3.Add an expansion joint. This will cause thrust force on pump nozzle so the control rods are required.
4.Ignore this issue.
Personally I agree with Dan to ignore it and like to know your experiences.
Thanks

I think there is a missunderstanding. Please read again my post. I wanted to say that if you are sure that there is no problem (which I doubt)go ahead because is your responsibility.
In fact you already have the answer in your possible solution number 2. In essence "doesn't help too much"

Do not use pipe anchors in front of pumps.

Add flexibility. Even seems to be uneconomic, is more economic than few pump failures.

Regards,

There are some posts about the problems you mention, one of this is:

http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=42996

Other good one is about three pumps connected together, but I can not find right now.

Regards,