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NO is correct, you can't have a combined mixed fire pump / domestic supply, from the same main supply maybe possible but again depends on the fire code / insurance underwriter, a major fire system could even require a separate stored source.

The problem is a fire pump is always on stand -by, once a pressure drop is registered it will come online, so how can it also be used as a water supply pump?

That's entirely upto you, but see how you go getting the insurance policy if the fire pump is not acceptable to them.

The insurance underwriter, the "someone* as you called them are the authority when it comes to the fire pump spec. As it's their risk, they dictate what's acceptable.

Your calculations are probably the problem, can't see 1 correctly sized valve in the overall system making enough difference to even be considered.

Re-divert supply only to the animal outlets for awhile, this might - and I stress might changed the behaviour.

Why not consult the manufacturer / representative, better than an open ended dataless question.

What do you mean by concentric collector, are you referring to an inlet or outlet reducer piece?

Post rubbish and alienate people on engineering websites.

It's undoubtedly cavitation. The reason why needs more info. Check the reasons listed above by others

Running performance tests with the service fluid is a bit of a stretch considering any respectable rig could contain an enormous amount of product plus the considerable costs involved in hazard protection for volitle liquids. There is sufficient data available to extrapolate for other than water.

Test message checking if forum is working.

As usual, all guess work based on insufficient data, round and round tail chasing - let's get some real information and save everyone's time. It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts...

The application details and the current pump selections, including the performance curve would certainly help to clarify your concerns. It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock...

There is no need for a "giant dust thingy" do an internet search and you might be surprised what you turn up. "small dust cyclone" might help. It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts...

Look at cyclone dust extracter. It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

Agree with 3DDave, probably more effective to seal the plaster models. It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

Good luck with that, but I would be surprised if that's the cause. It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

Always difficult to analyse installation problems from a distance, however the very basics should be checked initially before removing and dismantling pumps. 1, is rotationc correct 2.have gauges been checked 3. are all valves fully operational and open, 4. Double check everything, never assume...

Double check all instrumentation and readings before worrying about the pump. It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)