Need a pump for Tar

[op9]

I am soon to quote a job involving the disposal of waste tar by pumping it through compressed air atomised nozzles into a furnace which is also fired by nat gas maintaining around 1250 degC.in the furnace.

Previously "Mono" pumps with Viton rubber stators have been used. Supposedly the stator only lasts 3-4 weeks before replacement.

The only properties I have so far for the tar are:
Softening point.......................47 degC
Flash Pt.................................196 degC
SG @ 15.5deg C.....................1.32
Melting Pt. range....................70 to 80 degC
Visc in the storage tank...........50000 to 1000cp.**
**The temp in the tank is between 80 to 100degC.This visc seems rather high (37000 to 758cSt) especially for atomisation at the burner but I have yet to confirm this and determine the visc temp relationship for this tar.

At this stage I was wondering if anyone has experience with pumping or burning tar, and whether there are any other pumps suitable, especially with a longer working life.

Thanks,
Rod.

Rod Nissen
nissenr@one.net.au

 

[svanels]

Try to use an internal gear pump, it is a positive displacement pump which can handle high viscosities. Go to

http://www.vikingpump.com/engineer/10steps.htm

for some more info on these pumps.


S. van Els
savanels@cq-link.sr

 

[op9]

Thanks svanels.

Rod Nissen
nissenr@one.net.au

 

[butelja]

I agree with svanels. My company successfully uses many Viking internal gear pumps for viscous hydrocarbon applications. For sealing, consider a triple lip seal such as a Fluidtech PS-II or a comparable seal from another seal manufacturer. We have not had good luck with conventional mechanical seals in these pumps.

 

[ipsco]

Temperature, abrasion and pressure may be playing a part in the premature failure of the existing progressing cavity type pumps. Abrasives such as sand, sludge or metal fines in the tar combined with a high discharge pressure would have a dramatic effect on pump life, if it was not selected properly for these factors initially. Some progressing cavity pump manufacturers, including Moyno, also offer pumps with solid metal stators that might provide substantially better performance in this application. We have successfully applied Moyno pumps in waste oil burner applications with metal fines.

 

[svanels]

To Ipsco, I agree with you that progressive cavity pumps can pump extreme materials like cement, but there are different manufacturers. You have Robin Myers which uses the brand MOYNO and there is an other brand MONO, I think from Dresser. We had problems with some MONO pumps and we did not receive any response of the manufacturer.
We have about 400 MOYNO well pumps for pumping crude oil.