I'm assuming that your model is correct and not over-stressed.

You pipe will be 1416 kg/m run, contents(water) 1190 kg/m run, total 2606 kg/m run.

That is 25565N per metre run of pipe, so your 600,000N would represent a supported length of 23.5m approx. That is a reasonable span. What's the problem with that ?

Just add some supports if the load is too high.