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Over greased?

Mainly to reduce the chance of brinelling any ball or roller bearings.

Yes, confusing overall.

Great, now clear as to what's going on. Is the tank below grade, requiring a submersible? Why have a pressure tank? Have you considered using 1 pump in lieu of 2?

is anyone else as confused with the data supplied. 1. is the X axis in M3/H? 2. what does the Y axis represent? 3. what is Leo? 4. what is Pumpa blv? following on to what goutam_freelance has suggested, besides a flow diagram, a sketch and detail of what's what might help a little.

this should have been in the student forum.

Nothing to do with the pump efficiency.

Why are you so hung up on the velocity in the reducers, all it will do is add a minute amount of headloss to the overall total. Just calculate the head loss for each reducer and add it into the friction loss calc. for the system.

Ignore the inlet and outlet nozzle diameters, the pump has been designed for the maximum flow rate achievable, with all testing and results based on the flow thru' the pump measured at the pump inlet flange and the pump discharge flange. Just fit an appropriate flange adapters to the pump...

Not always, there are other Fire pump spec throughout the world.

Think you need to expand the detail: what oil, what is N2 - LL?

As LittleInch has said, it is meaningless as presented. However if the bladder failed on a running pump, why would you expect any change to the pump operation?

From memory a similar question / thread was discussed some years back, could be worth looking in the old posts.

A better approach would be to look at a positive prime system, this will eliminate the worry of not being primed and running dry, although a simple not primed alarm can be a fitted - just in case.

NFPA doesn't necessarily rule, depends on country and insurance underwriters

What do you mean by continuous operation, a diesel fire pump is designed to run until the fire is brought under control, that could be 5 minutes or 5 hours, plus they must start under any conditions, otherwise they are useless as a fire pump. My suggestion is to do some research on fire pumps...

Why would a fire pump run backwards? You should ask why this question from whoever raised the requirement.

I don't see a problem with either, plus I don't see any problem with option 1 of the interchangeability, if the case ever arose take the coupling with the motor.

Following Pierre's comment, discharge pressure changes at the square of the speed change and flow at the ratio of change, this can make a difference between OEM curve and operating curve, plus OEM test measurements are probably a lot more accurate than your site measurements.

Correct, crystal ball gazing and guess work for the want of a bit of useful data.