Pump performace 2

[RomanKatz]

Hello Friends,
I have a question for you regarding lubricants additives.

At this point I have a gear pump 1.5'' 1.5 Kw 3P (victor pump R40G44BF+Y do be exact). Inlet pipe is 4 meters long(1.5'') made of plastic reinforced tube. The outlet is 5 meters long same plastic tube that is then connected to 8 meters CS 2'' pipe (4 meter horizontally and 4 meters vertically).
I connect the inlet tube to a tilted drum of viscous liquid. It takes 1 Hr to empty the drum (about 3kg/min).

This is how I currently operate.
In order to make things better, I was offered a progressive cavity pump that is expected to deliver about 13 l/min. The supplier has said that my pump is “choked” by the suction tube and the several meters of hose. The pressure losses are quite remarkable he said.

If I shorten the suction tube how much difference will it make?
I have another gear pump that is 2'' diameter, I don't use it because 2'' plastic tube is hard to operate, but Is there a calculation that can be done to calculate the expected delivery rate?

Thanks

Best Regards
Roman Katz

 

[LittleInch]

I'm glad it's better, but it really should be doing even better than that.

You're not likely to get to 40l / kg/ min with that stuff, but with an even shorter or bigger inlet hose you could get it down to 10 minutes per drum...

Could you actually just tip it all into a bigger bucket directly attached to the pump? A bit like a hopper on a concrete pump? then it becomes how fast will it pour out of the drum before your pump starts pumping air...

But glad we've saved you the expense on a new pump when it wasn't the pumps fault.

Thanks for letting us know how it went, so many posters just vanish and we never know what happened.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[pierreick]

Hi,
Thanks for the feedback!
Did you try to warm up the product in the hot box prior to use after pipe modification?
Good luck
Pierre

 

[RomanKatz]

I am considering ordering dump dumpers to easy the flow of the material from the drum to the pump.

There is no much difference for me if it is 10 of 15 min per drum, the fact that it works means that I can change the filling process from the bottom to the top and that's what I am working on now.

I know that when a question is raised and people assist, they want and need to know how it turned out so I wanted to share the outcome with all of you.

Best Regards
Roman Katz

 

[RomanKatz]

Hello Friends,

Following this thread, I have installed a 2'' pump. same model gear pump.

It worked great, Amazing. Like 7 min per drum.
After some time(2-3 months) I have noticed a strange noise. Pump has 1 m inlet plastic tube and 1 m outlet tube. When I connect the drum and turn the pump on, there is a pressure build up on the outlet side of the pump. The outlet 1 m tube is under high tension and the pump is like vibrating and moves from side to side. I can't say that the material is more viscous than before, same drums and same additives.
I thought that the floor is dirty and the pump slips so I cleaned the floor. But that wasn't it.

Any idea why is this happening?


Best Regards
Roman Katz

 

[LittleInch]

Not easy to say, but sounds like a blockage to me in the discharge line.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[pierreick]

Hi,
Did you clear and clean the gears ? That's part of normal operation .
If you suspect the pipe , it should not be too expensive to replace 2*1m plastic tube to see if there a noticeable improvement .
My 2 cents
Breizh

 

[LittleInch]

If the outlet pipe is "under high tension" it implies the blockage is further downstream.

The pump should have an internal bypass line to prevent it stalling, but action of this would create some movement of the pump.

If it has no internal line then the gears are possibly jamming then moving, then jamming as the pressure gets too high. Not a good move.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[RomanKatz]

I think that because of the hot summer here, I am not heating the additives anymore. so I think that the additive is less viscous, but still viscous enough to cause this pressure.

If I replace the plastic outlet tube with a much tougher one, threaded and fix the pump to the floor will that work?
Or the pressure will damage the gear?

Best Regards
Roman Katz

 

[LittleInch]

If the pump has an internal relief valve then you're OK. But if not they yes, you could damage the pump.

but it's not a good idea to let the pressure get that high - much better to heat it a bit.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.