Hi,
I am trying to get a vacuum tank fabricated for a really old piece of equipment. I have a drawing for the tank, but need help with two things.
1. If we reduce the size of the tank by 1000cu. in, how can we determine if it will have an impact on the system. Drawing Calls for SCH10 thickness...
I think when we opened the pump the flush affect knocked some of the scale inside the pump. That is why we didn't see any scale rubbing against the impeller. That will also explain when the pump kicks out the amps drawn by motor go down.
Scale is the only possibility I can think of. After acid...
Okay 5hp motor was installed and it is still kicking out. We set the breakers such that they wont kick out even at 10 amps just to see what is the max. The motor still kicked out, so even a 10 HP motor will start kicking out.
Is there anything that can be done to reduce scale build up. We were...
Hi,
We are having leak problems with our caustic slurry lines. Slurry is white liquor (sodium hyroxide, sodium sulphate, sodium carbonate and sodium sulphide) and calcium carbonate. Temp is 200F (dont know the pressure but not very high). Flow rate is 92gpm in 4" ss304l line.
The problem is...
I have looked into changing the pump. But the problem is that system requires a head of 96ft with only 23 gpm flow rate. Options are very limited. I am open to suggestions.
I have nothing against putting a bigger motor. I am only worried that it will start kicking out too as we dont know the...
As the problem is so random, I would say it's an application problem, ie, SG changes or total head reduces or you have a power supply problem - voltage drop, any high demand equipment on the same supply line?
total head reduces? Can you please elaborate on that.
Also I am trying to...
You should give us more info to possibly help you :
- you mention throttling valve. Is it automatically controlled ? If so give us the percentage of opening versus time from one trip to the other.
It responds to the level of the tank pump is sucking from. pneumatic control valve.
- Do you...
The impeller is 9" (physically checked), S.G also checked.
Flow rate is 23gpm (nominal doesn't fluctuate much).
We just opened the pump and found very little scale build-up. The impeller was not rubbing against scale in the housing.
I also think that saying the pump is definitely pumping 23...
So the problem could be heat related. What are the ambient conditions? Are there other constants when it trips? You should get a bigger motor (maybe pump too) but for now, point a box fan at it and see if it still trips...
We have overloads at 4.10amps for a motor with fla of 3.2Amps.
It...
Basically your pump is underpowered and as the motor warms up seems to loose the sysnchrous speed which is just going to drag the power up and lead to overload.
If you can stick in a 5 HP motor all your problems may go away or better still swap the pump for one which has a duty point (BEP) much...
This is how I calculated theoretical power requriements.
Pump power required = (Flow rate (GPM)* Head (ft)* Specific Gravity )/(3960*Efficiency) =(23 (GPM)* 96 (ft)* 1.17 )/(3960*0.26) = 2.5HP
First, Your point is at 23 gpm and a BEP at around 70 gpm at constant curve from the graph.
This is...
So far you've mentioned flow rate (do you know what it actually is over time to any degree of accuracy?), but not differential head / pressure or density. Do these change over the time taken for your pump to trip out? Can you / do you actually measure them? Do you have an actual pump test curve...
The motor overload relay measures current and trips when the current exceeds the setting. Have the plant electricians checked the actual current being drawn by the motor and compared it to the relay setting? Is the overload relay in a very warm environment? Most overload relays are compensated...
Have you ever taken the time to open the pump and to actually check if the "build" of liquor is the prime cause?
Has the liquor SG been factored into the power calculation?
What is the liquor temperature?
Hi,
At the flow rate we have and with the S.G factored in (viscocity was very similar to...
Hi
I work in pulp and paper and am troubleshooting a pump. It is a centrifugal pump 9" impeller (goulds 3196mtx); motor 3HP, 1760RPM, 3phase constant speed induction motor, 575V, 3.2A. The flow rate we are putting out is 23gpm. The motor is the right size for application (meets the pump curves)...
