8 replies to this topic

[Mahdi1980]

Dear All I want to select a pump to transfer Fuel oil ( Mazut) 380 viscosity of which is between 270~380 cSt at 50 C. Which type of pump would be applicable, centrifugal or gear type?

[Araboni]

Mahdi1980 As I myself experienced in some projects, generally speaking the threshold of viscosity that usually centrifugal pumps can withstand is somehow 260 cP. I would not use centrifugal pumps for fluids higher than this figure and instead I prefer to use gear pump.

[Araboni]

Mahdi1980 As I myself experienced in some projects, generally speaking the threshold of viscosity that usually centrifugal pumps can withstand is somehow 260 cP. I would not use centrifugal pumps for fluids higher than this figure and instead I prefer to use gear pump.

[Mahdi1980]

Dear Araboni

Thanks for your reply. Scientific references say as you. ANyway,  in practice somewhere centrifugal pumps are used to handle fuel oil. I do not know anything about their performance and efficiency. What is your opinion?

[gegio1960]

mahdi,

one pump can't be selected exclusively on the base of one viscosity.

Generally speaking, both centrifugal and gear pumps are used in FO services.

Centrifugal pumps are generally preferred but at higher viscosities gear pumps become competitive.

A serious pump selection process with several vendors should be made in order to evaluate pros & cons of the various pump models that can be proposed.

You can obtain other advices if you attach the process pump data sheet.

Good luck

[Mahdi1980]

Dear all

I have a gear pump which has been bought for handling Mazut/Fuel oil with viscosity of 350 cp while in new case, Naphtha with viscosity of 0.5~1 cp should be handled. Please let me know if I can use such a gear pump for transferring low viscous Naphtha. What does Naphtha affect on  performance of the pump.

The Gear pump characteristics: flow: 100 m3/h , Head: 30 m; Rotational speed: 750 rpm;

Type: Horizontal Model: EGP 6150/308 (S1.00)/EXT4 with single mechanical seal

[breizh]

http://www.pumpschoo...o/selection.asp

 

Mahdi1980,

 

Consider the document above to support your work. A call  to the vendor is always good .

 

Good luck.

 

Breizh

[Mahdi1980]

Thank you Breizh for your reply and useful link.

 

Working with low flash point liquids and oil products like Naphtha is critical for me due to the fact that the  high slip or leakage in the gear pump may cause the fluid to be warm and form partial vapor during the operation which may be dangerous.

I would be glad if you or other experts had any further suggestion

 

Regards

 

Mahdi

[fallah]

 

I have a gear pump which has been bought for handling Mazut/Fuel oil with viscosity of 350 cp while in new case, Naphtha with viscosity of 0.5~1 cp should be handled. Please let me know if I can use such a gear pump for transferring low viscous Naphtha. What does Naphtha affect on  performance of the pump.

 

 

Mahdi,

 

In general, both high and low viscous liquid can be pumped with gear pumps; but in your case the care should be taken about:

 

1) Possibility of corrosion by Naphtha in material compatibility standpoint

2) Possibility of internal recirculation due to probable need to reduced clearances for lower viscosity liquid

 

Then, contact the relevant vendor to get the proper recommendations...
 

Edited by fallah, 26 November 2015 - 01:34 AM.