typical theory vs. practice.
We assume the supports are fully rigid (if the supporting construction is not modelled) which it isn't. Most probably the nozzle will carry more weight than your calculation says cause of the flexibility of the support itself.
If the stress is at 100.1 % of the maximum allowable it's not according to the code. Will it break? No, most probably not.

Only thing you can do is to trust on your experience and instinct. Try to eliminate as much variables as possible: thermal setting of pumps discharge, flexibility of support and such. Check your code stress comparison and maybe considering your case 105% is allowable. If you're not sure do the analysis again and again until everything passes the code requirements.
Moving the second support from the discharge nozzle further away will be a good start I guess (if the lines runs in 1 straight line for a while).