Delevan Pump Question

HighTide

HighTide

New member
My 5 GPM Delevan pump started leaking today and causing air to enter the lines as a crack appeared. After speaking with Bob at Pressure Tek, I mailed it to him for repair.

My question is: Since I will be without this pump for at least a week, I bought a 2 GPM Delevan from Tractor Supply (the only compatible one available at this store) as I need to keep working on this large condo project as the painters are waiting on my completion (both pumps are 60 PSI). Will this 2 GPM pump be able to push my chems through 200 feet of 1/2" hose while I am 3 stories in the air on a lift like the 5 GPM does? Also, do I use the same nozzles that came with the 5 GPM system?

The mildew and staining is so bad on the tops of these 3 story buildings that downstreaming has NO effect and I am having to use a roof mix to get them off (which up until my pump break was doing a great job). I am also fighting windy conditions so I am having to get up close to hit the dirty areas. I don't have (or have ever used) an x-jet but have always wondered if it should be in my arsenal. Thanks for any advice on this issue.
 
David I seriously doubt it, when you are up in the air the further you go you create more and more head pressure and the pump has to work extra hard to push the liquids that far up and that much hose makes it harder anyway. The same thing happens in pressure washers as well. Also the longer the hose the less pressure you will have.

I think you just wasted about 70 bucks in my oponion.
 
Russ, would it help me if I took 100 feet of my hose off and just used 100 feet? Given my situation, what should I have done? Should I just have waited to get my repaired or replaced 5 GMP one back?
 
HighTide said:
Russ, would it help me if I took 100 feet of my hose off and just used 100 feet? Given my situation, what should I have done? Should I just have waited to get my repaired or replaced 5 GMP one back?
Click to expand...
I would have replaced it with a Fatboy, it is way way way better.

Oh and you can buy the 2gpm pump for 70 bucks
 
Chris Francis said:
Russ did you switch to the air run chem pump or still running the delevan fatboy.
Click to expand...
never made the switch yet, we just built a 16 foot trailer rig for roof cleaning, I have the fatboy setup on it now but I already have the spot to mount the air diaphram system.
 
Self priming means the Delevan will produce enough suction on a dry line to pull the liquid up to the pump 14' above the level in a tank. Which is probably not a factor with a pump mounted near a tank or as long as the line is never dry. Any more than 14' it would have to be full of liquid first. Or primed by filling the line first.

I'm guessing 30' of head pressure on a 2GPM Delevan will keep you on the job for a long time. If I had a big project I'd order a new one from Bob tomorrow AM and use the other as a back up when he returns it. The 5GPM nozzles should not work well at all.
 

Attachments

  • feet.jpg
    feet.jpg
    115.4 KB · Views: 18
Chris Francis said:
Thank you Rick I though it meant 14 feet on the out going side not the in going side. What do you mean by head pressure of 30'.
Click to expand...

I looked this very thing up last night:

"Head" may be simply defined as any resistance to the flow of a pump. When pump manufacturers list the head pressure, they are referring to the vertical discharge pressure head. Described in very simple terms, a pump's vertical discharge "pressure-head" is the vertical lift in height (usually measured in feet of water) at which a pump can no longer exert enough pressure to move water. At this point, the pump may be said to have reached its "shut-off" head pressure. When you look at a flow curve chart for a pump, the "shut-off head" is the point on the graph where the curved line becomes horizontal as the flow rate at that point is zero. The higher a pump's head pressure, the more powerful the pump.
 
Chris Francis said:
Thank you Rick I though it meant 14 feet on the out going side not the in going side. What do you mean by head pressure of 30'.
Click to expand...

Hahaha! I'm waiting for Nicks next photo. :winknudge:
 
Head pressure is vertical height. How far a pump must lift a fluid. A 3 story residential type building would be about 30' to the gutter. Of course that can vary a bunch on commercial where they have all the HVAC mechanical etc above a suspended ceiling etc. Each floor there can run 14'+.

Head pressure. I'll bet it's all Nick can do to not comment on that one.
 
HighTide said:
My 5 GPM Delevan pump started leaking today and causing air to enter the lines as a crack appeared. After speaking with Bob at Pressure Tek, I mailed it to him for repair.

My question is: Since I will be without this pump for at least a week, I bought a 2 GPM Delevan from Tractor Supply (the only compatible one available at this store) as I need to keep working on this large condo project as the painters are waiting on my completion (both pumps are 60 PSI). Will this 2 GPM pump be able to push my chems through 200 feet of 1/2" hose while I am 3 stories in the air on a lift like the 5 GPM does? Also, do I use the same nozzles that came with the 5 GPM system?

The mildew and staining is so bad on the tops of these 3 story buildings that downstreaming has NO effect and I am having to use a roof mix to get them off (which up until my pump break was doing a great job). I am also fighting windy conditions so I am having to get up close to hit the dirty areas. I don't have (or have ever used) an x-jet but have always wondered if it should be in my arsenal. Thanks for any advice on this issue.
Click to expand...
LOL, this is a prime example why we preach Big Hose.
These small 12 volt pumps have relatively little pressure and flow to pizz away to start with.
The smaller and longer the hose, the more restriction, and the greater the flow and pressure loss will become.
Plus, a coiled hose has more pressure loss then an uncoiled one.
It may be worth it to you to simply go to the dollar store, and by a couple 100 foot lengths of 5/8 garden hose.
That is, IF you need that much ?
If you dont, cut it down to what you need ?
Price = 20.00!
That may get you out of the jam you are in ?
 
I know this isn't going to be popular with Chris,but with a 2gpm and even a 3 gpm 12v 3/8" is more than adequate from my personal experience.I wouldn't try running over 200' of hose and I'm not really sure you will get 3 stories out of a pump that small.We have done 2 story houses and had issues with lifting the chems.
I have even run 3/8" hose with our John Blue,but have 200ft of the blue kuri tech hose that will go on the rig this spring.
 
You must log in or register to reply here.
Back
Top