Condensation Induced Water Hammer

Condensation Induced Water Hammer. After condensate is formed, the flow inside the pipe has two components, steam and the condensate. According to wikipedia, water hammer is defined as a pressure surge or wave caused when a fluid (usually a liquid but sometimes also a gas) in motion is for.

(PDF) Multiple condensation induced water hammer events, experiments from www.researchgate.net

Unlike water hammer resulting from backflow, steam and condensate do not flow in opposite directions to cause water hammer. Baker engineering and risk consultants, inc. According to wikipedia, water hammer is defined as a pressure surge or wave caused when a fluid (usually a liquid but sometimes also a gas) in motion is for.

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The phenomenon starts with direct contact condensation of steam on subcooled liquid in horizontally stratified flow. However, on june, 16, 1994 (one year after the fatality), another condensate induced water hammer was experienced at hanford.

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When improperly drained of condensate in a high pressure steam main fills with condensate and completely surrounds the steam, an implosion takes place causin. It occurs when a steam pocket becomes totally entrapped in subcooled condensate.

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Depending on the pressures and temperatures involved, the reduction in volume may be by a factor of several hundred to well over. (a) as condensing steam loses its heat to the pipe wall and cooler.

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Water hammering , steam pipe water hammering Condensation induced water hammer (ciwh) in horizontal pipes condensation induced water hammer (ciwh) in horizontal pipes is a safety issue for various fields of engineering including nuclear (griffith, 1996).

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Google scholar [21] wallis g b, crowley c j and hagi y 1977 conditions for a pipe to run full when discharging liquid into a space filled with gas asme j. The vapor transition to liquid state.

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At a site, 20 miles north of the previous water hammer, during a steam restoration evolution at the 284e powerhouse a condensate induced water hammer occurred when the operators began Depending on the pressures and temperatures involved, the reduction in volume may be by a factor of several hundred to well over.

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It could also be aptly termed a rapid steam bubble collapse. Depending on the pressures and temperatures involved, the reduction in volume may be by a factor of several hundred to well over.

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The schematic view of a ciwh in a horizontal pipe is shown in fig. Water hammering , steam pipe water hammering

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This occurs, for example, in the chemical industry or in the emergency cooling of a nuclear reactor, where cooling. The sudden deceleration of the slug by existing liquid in the system or any part of the piping system can produce.

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Water hammering , steam pipe water hammering It is also a safety issue.

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The condensation induced water hammer (ciwh) is a fast thermalhydraulic phenomenon that can cause a serious damage to equipment and endanger lives of working staff in all plants where vapor and subcooled liquid come into contact. During the condensation process, the space occupied by the steam momentarily becomes a vacuum, and the condensate inside the piping surges toward this vacuum.

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Depending on the pressures and temperatures involved, the reduction in volume may be by a factor of several hundred to well over. After condensate is formed, the flow inside the pipe has two components, steam and the condensate.

Water Hammering , Steam Pipe Water Hammering

Unlike water hammer resulting from backflow, steam and condensate do not flow in opposite directions to cause water hammer. The vapor transition to liquid state. The flow velocity of steam is much higher than that of the condensate.

It Is Also A Safety Issue.

Baker engineering and risk consultants, inc. The experiments were carried out with varying the water subcooling values (40 and 60 k) and the froude number (fr = 0.3, 0.6, 0.9, and 1.1), which was determined from the supplied water flowrate. It occurs when a steam pocket becomes totally entrapped in subcooled condensate.

Not Only Is Water Hammer Is A System Issue;

During such dual phase flow, the heavy condensate which flows at the bottom of the pipe is pulled by high speed steam. The schematic view of a ciwh in a horizontal pipe is shown in fig. Understanding the nature and severity of water hammer in a steam and condensate system will allow plants to avoid the safety risk and destructive forces.

Just Like Water Hammer Caused By Backflow, Water Hammer Impacts May Occur Far Away Or Upstream From The Convergence Point Of Transport Piping.

The present work focuses on modelling of direct contact condensation in a horizontal channel. The phenomenon starts with direct contact condensation of steam on subcooled liquid in horizontally stratified flow. A condensation induced water hammer is a rapid condensation event.

Not Only Is Water Hammer Is A System Issue;

In this case the problem is caused by the formation of large 'pockets of steam'. The sudden deceleration of the slug by existing liquid in the system or any part of the piping system can produce. As the steam gives up its heat to the surrounding condensate and pipe walls, steam changes from a vapor to a liquid state.