Slurry Pump

[Chaitanya Ojha]

I am working on a project as an intern in a steel manufacturing plant. There is a slurry pump namely VASA-284/100. I am unable to find any proper information and formulations required for the calculation regarding slurry pump, its discharge, its efficiency and other parameters. I was hoping to gain some guidance her.

Thank You in advance
Chaitanya

 

[Artisi]

The pump was originally a product of Sala International manufactured in Sala Sweden. Has been sold and would have new name - you will have to search the internet to find out who, where etc. Check "Sala Pumps" to start with.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Chaitanya Ojha]

Can you guide me in calculation part?

Chaitanya

 

[Artisi]

No, you need the hydraulic performance of the pump before you can do anything and then you need the duty you are trying to achieve.

I've got a Nissan car, can you please tell how fast I drive and how long it takes to drive to the super market????

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Chaitanya Ojha]

I have got the following details
power - 30kW
line length - 30m
pipe dia - 10cm
no of bend elbows - 3
suction head - 20m
delivery head - 1m
density of solid - 2.5tonnes/m^3
weight of solid - 96tonnes
avg. particle size - 150µm
sp gravity of solid - 2.5g/cm^3

i tried calculating but i got result of only slurry velocity, limiting settling velocity, slurry discharge, i can't figure out how to calculate the pumping power required, wheather the pump is sufficient on its own or it requires a booster pump?

Chaitanya

 

[Artisi]

Pump curve?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[aap2]

You need to calculate your head loss. There might be too much loss in the line for the pump to pump up the delivery head.

 

[MFJewell]

Specific gravity is a ratio and should have no units.

 

[ashtree]

If suction head really is 20 metres, that is if the pump is 20 metres above the slurry , that will be a problem.

Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

 

[LittleInch]

Chaitanya,

Your data as supplied leaves a bit to be desired
Based on the sheet below

http://valveproducts.metso.com/documents/pumps/Brochures/en/1848-10-10_en.pdf

power - 30kW - motor size from data sheet
line length - 30m - Are you serious? This seems very low for such a big pump
pipe dia - 10cm - ~OD, ID, material? This is a 4 " pipe?
no of bend elbows - 3
suction head - 20m - Do you mean this is 20m of positive head coming into the pump?
delivery head - 1m - Assume you mean elevation difference, but what is end pressure / discharge pressure?
density of solid - 2.5tonnes/m^3
weight of solid - 96tonnes v- - What does this mean? pointless without a time span or explaination
avg. particle size - 150µm
sp gravity of solid - 2.5g/cm^3

Missing - flowrate and end connection pressure / head

The data seems to show you will have a desired flowrate between 60-120 m3/hr at a differential head of 20-30m.

That sort of head with a 30m long 4" pipe doesn't stack up.


You might find this useful

http://www.metso.com/miningandconst...257E7A00457903/$File/Slurry Pump Basic_13.pdf

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

 

[MJCronin]

Chaitanya,

A little detail that has not yet been mentioned in this discussion....

I have dealt with METSO slurry pumps before. What is not understood by many newbies is that METSO pump curves are typically offered with various speeds noted.

Because you are dealing with reuse of an existing pump, you must know your existing motor speed and belt speed ratio to obtain the true operating speed of your pump.

Only then can you evaluate the correct pump curve and possibly consider a new speed ratio.

Tell us more about your setup including motor speed and pulley diameter ratio.

Is the pump controlled by a VFD ?

Regards


MJCronin
Sr. Process Engineer

 

[Artisi]

LittleInch, the METSO pumping manual is fantastic and a must read for anyone involved with pumps, not just slurry pumps, couple this with the attached Weir/Warman slurry pumping info. you couldn't ask for anything more.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Artisi]

Chaitanya, suggest you re-evaluate the whole enquiry and put together some meaningful information, exactly what you are trying to do, what's the process, pumping from where to where, pump detail /speed, etc, you might get some useful info.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[SandCounter]

You will find the nomograph on page 4 of this link to be helpful for determining minimum slurry velocities. For your D50, you will need a minimum of 40 m/hr to keep your solids suspended. If your solids are poorly graded, I recommend designing to the D80. Without clarification if your suction and discharge heads are lifts or depth of fluid above the suction or discharge, as LittleInch points out, it is difficult to provide an answer. Nevertheless, assuming this pump, it appears that you will be on the high end of the pump curve and probably experience inefficiencies and high torque. You have plenty of power.


I used to count sand. Now I don't count at all.

 

[Chaitanya Ojha]

Pump Table

 

[Chaitanya Ojha]

Pump Curve

 

[Chaitanya Ojha]

Thank you for your replies i will read the manuals and do more study regarding this topic.

Thank you
Chaitanya

 

[LittleInch]

Not much further forward I'm afraid - these are the details I posted above. Please go through the posts above and answer as many of the questions as you can. Especially flow and pressure.

The pump needs to be matched to it's system. Only then can you determine things like flow, power etc. a4" 30m long pipe with no discharge pressure will have a very low frictional losses until the velocity rises to something very high which will wear your pipe out in days.

Please describe your system more clearly.

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

 

[MJCronin]

You do not seem to have a slurry pump curve attached to your above post.

If you do not spend time carefully examining every detail of your problem, you will fail ...

Examine the variable speed pump curve and the operating point noted here:

http://www.taspumpmonitor.co.za/technicaloverview.htm

MJCronin
Sr. Process Engineer

 

[SandCounter]

This is where I'm confused. See attached.

I used to count sand. Now I don't count at all.