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Anonymous Poster

Vortex Breaker

03/10/2008 6:33 AM

What is vortex breaker and how can we get the effectiveness of the vortex breaker for the same envisaged for the outlet pie from thr bottom of the tank and going to Pump suction. For example pipe going to Boiler Feed pump from the Deaearator storage tank outlet.

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Guru
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#1

Re: Vortex breaker

03/10/2008 7:12 AM

A emergency fix is to drop a few planks into the suction pit. It prevent circular flow and a vortex from forming.

This same idea can be followed by placing baffles in the pit.

The energy of the inlet flow should also be dissipated otherwise it may cause a circular motion.

Mr Coriolis should also be banned.

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#2

Re: Vortex Breaker

03/10/2008 10:02 AM

A simple vortex breaker can be made as follows:

  • From the same materials-of-construction of the tank, cut three pieces of flat sheet, in the form of a long right-angled triangle, longer than the 5:12:13 right-angled triangle, for illustrative purposes. The "5" side should be longer than 2/3 of the diameter of the outlet pipe, so that when the vortex breaker is assembled, it is too large to pass into the tank outlet pipe.
  • Fasten the "12" sides together so as to form a structure similar to the head of a 3-sided arrow.
  • Position the sharp end of the arrow inside the outlet connection of the tank, so that it cannot pass into the outlet pipe.

Bingo. One vortex breaker.

Products to this design may be found in the KrisDelTM catalogue (usual disclaimer), though Stinky Pete may have squirrelled one away somewhere.....

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Guru
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#3

Re: Vortex Breaker

03/11/2008 12:24 AM

The vortex breaker is required to be furnished into the outlet nozzle of liquid discharging from a tank/vessel to prevent swirling of flow or what we call vortex which allows the surface of the liquid at the area above the nozzle to be lowered (like a cone its base at the surface of the liquid and its head at the nozzle) until gas/air inside the vessel transmitted through that nozzle going with the liquid. This gas/air mixed with the liquid causing a case of bad operation or can reach the impeller of a pump which causing too a bad operation to the pump. The vortex breaker avoids that swirling or vortex formation.

There are a lot of types and designs of vortex breakers. There are a many sites handling with that phenomenon such as Chemical plant design & operations - vortex at the tank outlet

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#8
In reply to #3

Re: Vortex Breaker

12/27/2009 4:40 AM

Thanks abo galala .... as usual simple answer with numerous benefits....urs mbaz

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#9
In reply to #8

Re: Vortex Breaker

12/28/2009 12:37 AM

Thank you mbaz_81,

You are welcome, but why your sharing is only 5 posts since Aug 2007, we look for many participations.

For that CR4 Thread title, you can also see: Vortex Problems in Pump Applications.

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#10
In reply to #3

Re: Vortex Breaker

09/01/2010 5:41 AM

Is a vortex breaker required if the pump suction nozzle is to the side (i.e. vertical side) of the vessel ?

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#11
In reply to #10

Re: Vortex Breaker

09/01/2010 11:30 AM

If the suction nozzle located at side, there must be a specific min. head of liquid, and we recommend vortex breaker and/or flat baffle. See the following site: http://www.gouldspumps.com/pag_0006.html.

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#13
In reply to #11

Re: Vortex Breaker

07/26/2011 7:00 AM

Dear Abdel Halim,

You always came up with correct and precise answers. can i know your email address. please.

sajid aslam

Metallurgical and Materials Engineer

working in petrofac.

regards

CR4 Admin - email address removed

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#4

Re: Vortex Breaker

03/11/2008 1:42 PM

As stated there are a number of ways to do it.

I have also done this with brining operation where there is a high volume pump on a shallow tank or reservoir.

I included a picture of a sample.

It basically break it into smaller vortexes so you would not get cavitation to the pump

Hope you can see it, or I can email it.

phoenix911

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#5

Re: Vortex Breaker

03/11/2008 3:57 PM

AS I KNOW , THE VORTEX BREAKER IS USED IN SOME TYPES OF PRESSURE VESSELS, ITS LOCATION IS OPPOSITE THE OUTLET NOZZLES, IT IS USED TO BREAK THE VORTEX WAVES STREAMS NEAR THE OUTLESS NOZZLE

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#6

Re: Vortex Breaker

03/14/2008 4:39 PM

I worked on Main Condenser for Steam Powerplants and the hotwell condensate discharge have what we called "baffles" whose primary function was to prevent swirl in the discharge flow. The baffles were cross "+" plates welded inside of the condensate discharge pipe.

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#7

Re: Vortex Breaker

03/30/2008 10:12 AM

Hello Guest,

Whenever there is flow of water through a drain pipe, you will notice a swirling effect.

You might have seen this in sink of your kitchen, or when you are draining the bathtub.

The same applies to silos or deareators where the suction point at deareator creates

swirling effect (vortex).

Now, this is harmful to pump as it traps air and causes cavitation in pump, so to break the swirling a "vortex breaker" is installed at the suction point ( bottom of deareator) ...as shown in the image.. (see 13B)

This does not allow the vortex to form and hence is useful in deareators.

Hope it is clear.

Cheers.

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#12

Re: Vortex Breaker

10/25/2010 3:46 AM
You can use the following equation from the ANSI/HI 9.8-1998 "Hydraulic InstituteĀ“s Pump Intake Design" that is:
S = D + 2.3DFr
S is the minimum required submergence to avoid vortex formation.
D is the nozzle diameter and Fr is the dimensionless Froud number, Fr = V/(gD)**0.5
V is the nozzle flow velocity and g the gravitational acceleration.

or

Refer to "Pressure Vessel Handbook", Megyesy, Vortex Breaker

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#14
In reply to #12

Re: Vortex Breaker

09/08/2011 11:20 AM

sorry can you specify wich unit system must be used in formula?

Thanks

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Users who posted comments:

Abdel Halim Galala (3); Azhar Ali (1); chaterpilar (1); Gannet (1); Hendrik (1); Lorenzo (1); mbaz_81 (1); met_3mr84 (1); papasumit (1); phoenix911 (1); PWSlack (1); sajidaslam (1)

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