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Investigation of Polymeric Elastomers for Cavitation and Erosion Resistance

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Cavitation occurs in localized areas where there is a pressure drop across a structure; the water goes through a phase transition and forms water vapor. These vapor bubbles implode, resulting in high velocity micro-jets which impact adjacent surfaces. These impacts release shockwaves of energy, which cause microscopic particles of the surface material to flake off.1 Repeated micro-jet impact causes microfractures in the affected surfaces and leads to pitting.

Product Number: 51323-18950-SG
Author: Allen Skaja, Christine Henderson
Publication Date: 2023
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$20.00
$20.00

Damage caused by cavitation and erosion is observed on hydro-turbines, pumps, pipes, gates, draft tubes, and outlet conduits. Mitigating the effects of this degradation on metallic hydraulic steel structures will reduce downtime and costly repairs. Traditionally, stainless steel weld overlays are used for cavitation repairs on these structures. Welding stainless to mild steel creates a galvanic corrosion cell in immersion conditions, which can cause delamination of the stainless steel and subsequent loss of cavitation protection. Cavitation resistant coatings could be used in combination with stainless steel weld overlays to eliminate the galvanic corrosion cell, thus providing protection and extending the service life of the repairs. This paper investigates the cavitation resistance and material properties of polymeric elastomer coatings. Several elastomers were selected for testing based on their mechanical properties such as percent elongation, tensile strength, tear resistance, and Shore hardness. Findings include the results of laboratory testing of cavitation resistant coatings. Elastomers are shown to provide better cavitation and erosion resistance than ceramic filled epoxies.

Damage caused by cavitation and erosion is observed on hydro-turbines, pumps, pipes, gates, draft tubes, and outlet conduits. Mitigating the effects of this degradation on metallic hydraulic steel structures will reduce downtime and costly repairs. Traditionally, stainless steel weld overlays are used for cavitation repairs on these structures. Welding stainless to mild steel creates a galvanic corrosion cell in immersion conditions, which can cause delamination of the stainless steel and subsequent loss of cavitation protection. Cavitation resistant coatings could be used in combination with stainless steel weld overlays to eliminate the galvanic corrosion cell, thus providing protection and extending the service life of the repairs. This paper investigates the cavitation resistance and material properties of polymeric elastomer coatings. Several elastomers were selected for testing based on their mechanical properties such as percent elongation, tensile strength, tear resistance, and Shore hardness. Findings include the results of laboratory testing of cavitation resistant coatings. Elastomers are shown to provide better cavitation and erosion resistance than ceramic filled epoxies.

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Investigation of the Effects of Residual Peroxide on Localized Corrosion Susceptibility of Stainless Steel Equipment at Hanford Waste Treatment Facility

Product Number: 51323-19095-SG
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Bulk Anode Advancements in Sacrificial Cathodic Protection Jackets

Product Number: 51323-19161-SG
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Zinc Tidal CP jackets have been utilized to protect the splash zone of steel reinforced concrete piles against aggressive corrosion due to seawater exposure since the mid 1990’s. Galvanic CP jackets are installed on piles in the splash zone and provide galvanic current to the jacketed areas (Figure 1). The submerged portion of the pile that extends below the jacket is always exposed to seawater.
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Practical Considerations For The Assessment Of HTHA Risk

Product Number: 51323-19187-SG
Author: Jeremy Staats, Dave Dewees, Gerrit Buchheim, Frank Sapienza
Publication Date: 2023
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Becht is among multiple engineering groups which has developed a practical model to continue giving owner-operators higher confidence by extending HTHA assessment methodologies to be more quantitative using decades of development from the literature. This model has incorporated a well-established analytical damage model that can produce time-based Nelson Curves for carbon steel and C-0.5Mo materials, based on the temperature, hydrogen partial pressure and applied stresses.

The key to any quantitative model is managing the input parameters and validation of input data.
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