Corrosion Product Sampler

NWT Corrosion Product Samplers

Corrosion Product Sampling

In addition to the impact of corrosion on the performance and reliability of power cycle components such as feedwater heaters and condensers, release of corrosion products from such components and their deposition in turbines and steam generating equipment frequently has led to losses of power generating capability at fossil and nuclear power plants. Since grab sampling and analysis approaches generally will not yield accurate concentration data because of the nature of the corrosion product transport process, application of integrating sampling techniques is mandatory if corrosion product transport and deposition rates are to be quantified (NP-5056-SR).

Based on NWT Corporation's extensive knowledge and experience relative to corrosion and corrosion product transport in power generating cycles, several integrating sampler designs have been developed for such applications.

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Product Description

NWT offers single channel corrosion product samplers with or without a sample cooler. Both samplers include bypass flow capability. This configuration provides the ability to process a sample from any point in the cycle while maintaining a high sample line Reynolds number via the bypass system.

A 0.45 µm filter is generally used to collect filterable species from a continuous sample flow with a cation ion exchange membrane inserted below the filter to collect soluble cationic species and possibly colloidal species passing through the 0.45 µm filter.

With a sample flow of 100 ml/min for 24 hours, the membrane packet accumulates the impurities present in a 144-liter sample. Pressure regulation is provided to maintain a constant sample flow as the pressure drop across the membranes increases with time. The flow totalizer furnishes an accurate value for the total sample volume.

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As stated in the PWR Secondary Water Chemistry Guidelines [1]: “This sample collection method allows long-term averaging of corrosion product concentrations thereby providing a firm basis for performing mass balances around specific components, e.g., it is possible to identify major sources of corrosion products within the feedwater system.”

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Two standard corrosion product sample models are available:

Customized designs also available.
Delivery can generally be made 10 weeks after receipt of order. Please call or email for pricing details.

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Support Services

NWT Corporation offers the following services to support clients in their efforts to reduce corrosion product transport in a cost-effective manner:

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  1. “PWR Secondary Water Chemistry Guidelines,” EPRI, March 1987 (NP-5056-SR).
  2. Sawochka, S.G., Copley, S.E. and Pearl, W.L., “Corrosion Product Transport in PWR Secondary Systems,” EPRI, February 1987 (NP-2149).
  3. Hook, T.A., Pearl, W.L. and Sawochka, S.G., “Corrosion Product Transport in a Cycling Fossil Plant,” EPRI, February 1987 (CS-5033).
  4. Kassen, W.R., et al., “Application of High Temperature Electromagnetic Filtration for Secondary Cycle Corrosion Product Transport Control in Pressurized Water Reactors,” Proc. Intl. Water Conf., 46 , pp. 467-486, 1985.
  5. Sawochka, S.G., et al., “Effects of Alternate pH Control Additives on PWR Secondary Cycle Chemistry,” EPRI February 1988 (NP-5594).

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Request Information

For more information, please contact Matt Leonard by E-mail or by phone, (408) 281-1100.

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