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My apologies for not getting back to this, sudden heat wave (by our standards) and scramble on A/C as well other projects. I appreciate the thoughts on this. I am trying to understand any dynamics of the tank performance at low levels. There is not intent to try to correct anything. ...

I think I obscured the question, it is what is the lowest level we can run before we loose suction in the tank? I am having to review my data as I think the intake is 16 inches and the Anti Vortex plate is 4 feet (i.e. what happens when the water level drops below the plate. I need to...

I am in the process of setting a procedure for dealing with whats probably a fairly typical situation but I can find no information on it in regards to what occurs at the low end of the tank water levels. We have a 29 foot supply in the tank with an intake thats 3 feet with an Anti Vortex...

LittleInch and EdStainless: Thank you both for the thoughtful responses. LittleInch: I am not familiar with the HAZOP term (I am more a technician than my "title" of engineer which comes sans any letters to go with it.). Hazards to Operation? Ironically our system uses a heat...

I certainly appreciate the input. As its a violation of NFPA and the AHJ (not to mention company policy that mandates the system actually be checked and tested to ensure it will function in the event of a fire that takes the don't run at all off the table. Its obvious we have to live with it...

This is an issue that confounds me and others I have talked with but has very little exposure and as far as I can tell no recognition in the codes. I came across this the in the forum "thread407-292211" In our case we have found extensive damage to the intake of the pumps around the wear...

Thanks to both. I have the OSU set from TravisMack and will do trial runs when I get some free time (winter hit and heating systems are hot issue right now). Will check out the other one as well from Firesout.

I have had no experience with centrifugal so no opinion on those. Screws in my opinion are a pain. Oil carry over is an issue and takes very good setup at the point of service. They also wear out (preferred operation mode is running in load unload if you have to rather than on off which is...

Keep in mind for recip use, VFDs can go down to 25% of motor speed, but the compressor has a minimum speed needed for lubrication. You always have to ensure that the VFD maintain at least the minimum compressor speed. Also, add on VFDs are bad things (and possibly package units). There...

I believe the whole package still has to be FM approved at least in most applications by the Authorities Having Jurisdiction (saves them huge amounts in not having to hold the expertise to do it themselves). Note that supposedly, we cannot use any component on the system that is not the...

Good plan! Hondas as mentioned if you have that need to vary the load so much that at times you want all of it and others when you can reduce to either one of the two seperte units larger or smaller one off. Otherwise a single larger unit.

Once a year I need to run calcs for a pitot tube flow test out of a Play Pipe. I am building a chart with our values, but its an annoyance to do it by hand or interpreting between tables. Also auto plotting the test results on a pump curve and seeing where it stands would be a help. It...

What I do know is that if you are going to run them on a VFD, you need to get ceramic hybrid bearings on each end at the very least. If not, the VFD causes arching in the balls/races, eating them up and destroying the grease with it. If its belt driven that seems to do the trick, at least...

The only time I have had an issue with a diesel engine back fire was/is exhaust system (this is a fire pump so there are different operational characteristics than a gen set that you can cool down, in this case cool down is not possible and has to be accepted) In our case the silencer is...