Recent content by Artisi

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