Preventing Cavitation Damage in Liquid Ring Pumps

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Water ring vacuum pumps in operation, if its flow components usually somewhere in the impeller blade inlet later when the pumping pressure of the liquid is increased relative to the later liquid vapor pressure under heat, the liquid will be in the end where the gasification generating a large number of steam bubbles constitute, when the liquid contains a large number of bubbles by a low pressure area forward of the impeller, a low pressure liquid bubble around so abruptly cause an enlarged bubble burst.

In the bubble burst simultaneous condensation, liquid particles filling a hole at a high pace, at this moment to generate very strong water hammer and strikes at high efficiency in combating non-metallic name of strikes, how much stress to reach the most number of one thousand one hundred atm, strikes efficiency reached tens of thousands of times per second, will be significant when the thickness breakdown - this is the water ring vacuum pump cavitation.

What is the principle of water pump cavitation? Cavitation is caused by the liquid gasification, liquid molecules escaping liquid nominal, into the inner gas molecule, known as "gasification.

When the liquid external pressure rises, lower than the saturation vapor pressure of the liquid at the time of the heat, in all waters constitute air bubbles or pockets; and in the center of the bubble pressure rise suddenly crushed by the pressure around the liquid flow due to high elasticity progress to the bubble core extrusion, causing hydraulic strikes on facilities such microbubble generation, collapse.

This because of the pressure rise in the liquid bubble disappearance scene called cavitation collapse. If the pump impeller cavitation site has large residual pressure will cause impeller cracking. Because the pump cavitation bubbles occur naturally consecutive division, and the accompanying severe water hammer in the high-pressure zone, while noise and vibration. You can hear the crackling like popcorn-like movement.

Assuming that the above division bubbles on the metal surface, the metal surface will suffer continuous severe water hammer, pitting, metal grain loose and falling from a honeycomb, or even perforation. In addition to the mechanical effects of cavitation damage, but also accompanied by a liquid ring vacuum pump cavitation frequencies of messy effect electrolysis, chemical corrosion.

Actual damage indicated, the pump flow components cavitation damage to the site, just missing part of the bubble. Water ring vacuum pump cavitation corrosion is generated in the bubble and broken parts, non-metallic nominal emerged pitting phenomenon, it will emerge a major cellular destruction. Pump impeller cavitation site has large residual stress, can lead to stress released, cracks.

Because the pump cavitation bubbles in the low pressure area have produced a sudden burst, and along with the strong water hammer generated noise and vibration can be heard crackling like popcorn-like tone. Then the above-mentioned bubble burst in nominally non-metallic, non-metallic nominal will be another strong water hammer emerged pitting, non-metallic grain loose and peeling from a honeycomb and even perforation.

Cavitation destroyed except for the mechanical action, also accompanied by a variety of simple role electrolysis, chemical erosion. Destroy motivation theory indicate that the central liquid ring vacuum pump cavitation frequencies flow element cavitation destruction of the site, is the bubble disappearance.

Vacuum pumps need to use a liquid medium as a job. Each liquid at a certain temperature has a corresponding saturation vapor pressure. When the relative pressure of the suction on the verge of the sea, the more saturated vapor pressure of the liquid, the liquid state on the verge of evaporation.

Then, in the name of the job was sucked waters will produce a large number of bubbles in the job because the liquid fluid vapor can produce dragon Huju jobs cavity space of all jobs cavity pump suction external power liquid ring vacuum pump cavitation frequencies rise.

When the suction pressure of the waters reached the saturation vapor pressure of the job he was able to find a job was a job full of heavily cavity steam pump at the brink of the external suction power to zero, at which point the pump cavitation phenomenon is also the most important. Work liquid of water ring vacuum pump is water, the higher the temperature, the pumping performance of the pump to rise more.

In the middle sulk vacuum bubble and the bubble burst so overcurrent elements within the mask is being destroyed within the vacuum pump cavitation.

After the vacuum pump cavitation unless overcurrent elements produce destruction effect, but also produce noise and vibration and lead to increased pump performance, significant time will pump liquid suspension, useless deformity work. Water ring vacuum pumps work long hours under cavitation state, it will cause the pump noise, vibration becomes large, and even cause damage to the pump, and thus should try to prevent liquid ring vacuum pump cavitation frequencies ring vacuum pump in the cavitation mode of operation, can pass seq steps: Cavitation protection tube fitted with a vacuum pump, cavitation bubbles produced during the compression process is broken when introducing higher pressure non-condensable gases from liquid ring vacuum pump cavitation frequencies outside can replenish space because the bubble burst occurs, this can reduce the large pump cavitation hazards and reduce noise and vibration caused by cavitation.

Means there is a vacuum pump cavitation cover tube, inside the cavitation bubbles generated during compression within the rupture, liquid ring vacuum pump cavitation frequencies introduction of higher pressure from the non-condensable gases can replenish internal liquid ring vacuum pump cavitation frequencies burst and because of the emergence of space, so can greatly increase cavitation of pump cavitation cause harm and increase 2BV series, 2BE1 series features cavitation protection tube.

When the pump cavitation phenomenon, cavitation protection from the exhaust side of the pump tube filled with gas to eliminate cavitation noise, and greatly reduce cavitation liquid ring vacuum pump cavitation frequencies to the pump. Air ejector effect is the use of absolute atmospheric pressure in the vacuum pump to generate air jets, lose less than the pump suction pressure within the injector thus eliminate the vacuum pump liquid ring vacuum pump cavitation frequencies pressure, prevent pump cavitation, played the role of a vacuum pump cover.

Because the atmosphere is to prevent the ejector pump cavitation, pump cover and set properly provided with an air ejector vacuum pump, vacuum suction constituted better than not fitted. Such as, stainless steel, bronze and other materials ,ect. High quality liquid ring pump, compressor manufacturers! Industrial products OEM manufacturers! Shandong Jinggong Pumps Co. Shandong Jinggong Pumps has two modern production plants which cover an area of more than 46, square meters, liquid ring vacuum pump cavitation frequencies which the plant area reaches 31, square meters, with a registered capital of Water ring vacuum pump cavitation principle and the method of prevention.

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The boiling point is different because the atmospheric pressure pushing down on the water in Denver is less than at sea level, which allows the liquid to convert to vapor at a lower temperature.

When liquid is boiling in a cooking pot we call it "dinner". When the liquid ring in a pump starts to boil, we call it "cavitation". Much like the pot of water example, cavitation in a liquid ring pump is caused when the operating pressure of the liquid ring reaches the vapor pressure of that liquid. This causes some of the liquid to become vapor, forming bubbles that travel around with the liquid ring. As these bubbles travel inside the pump they collapse, or implode, and can break off pieces of the pump.

These pieces travel with the liquid ring and cause further damage through erosion. The answer is more complicated than you might think. Cavitation is a function of both temperature and pressure.

The lower the operating temperature of the liquid ring, the lower the potential for cavitation. However, if the operating pressure of the pump is close to the vapor pressure of the ring liquid at the operating temperature, cavitation can still occur. In cavitation prone operations, like condenser vacuum pump duty, it is a good idea to periodically record the temperature of the seal liquid supply and discharge. Increases in temperature can indicate the need for a checkup, and trending them over time will allow you to schedule preventative maintenance before reliability is affected.

With the changes in the power industry, some plants with no history of cavitation with their condenser vacuum pumps may suddenly start to have problems. Why would this happen? With more renewable power available, power plants that previously ran at full load now find themselves having to turn down their generation capability to provide only enough power to "fill in the cracks" on the power grid. At reduced load, the turbine main condenser will operate at a lower pressure than it did at full load.

Since turbine condensers operate at the saturation temperature, the lower operating pressure means the vapor pressure of the liquid ring will be closer to the saturation temperature at the operating pressure. This is a recipe for cavitation in 'unhealthy' vacuum systems. At Nash, we have always taken special care to minimize the potential for cavitation when designing our systems. We have seen the industry trend toward operating the vacuum equipment at conditions more prone to cavitation, and we have challenged our engineers to develop methods to further reduce the potential for cavitation in our liquid ring pumps.

The new design doubles the useful life of a pump operating under conditions prone to cavitation without impacting power or performance, and is available on new models and as an aftermarket upgrade.

If your power plant is being asked to run at low loads or if you have had a history of cavitation in your liquid ring pumps, you may be at risk for cavitation damage. Contact Nash before performance and reliability become an issue. We can discuss your options for preventative maintenance, and upgrades that will help you avoid downtime and costly repairs. Want to learn more about preventing and identifying cavitation in your liquid ring vacuum systems?

Contact Nash today to schedule a short, informative webinar. Whether you are a submarine captain or a maintenance manager, it is not something you want to hear. Cavitation damage in a liquid ring pump What is cavitation?

How does cavitation cause damage? What can we do to avoid cavitation in a liquid ring vacuum pump? Learn more about the TC Anti-Cavitation Upgrade Want to learn more about preventing and identifying cavitation in your liquid ring vacuum systems?