Service lifetime prediction of nitrile butadiene rubber gaskets used in plate heat exchangers

Wiley - Tập 139 Số 28 - 2022
Mateus de Sousa Zanzi1, Elias Luiz de Souza2, Gabriel Benedet Dutra1, Kleber Vieira de Paiva1, J.L.G. Oliveira1, Tiago Vieira da Cunha1, André Sampaio Monteiro3
1Thermal Fluid Flow Group – T2F – Department of Mobility Engineering Federal University of Santa Catarina Joinville Brazil
2Department of Mechanical Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
3CENPES, Petrobras Cidade Universitária Rio de Janeiro Brazil

Tóm tắt

AbstractGasketed plate heat exchangers are characterized in a usual heat exchanger class. These systems employ elastomeric gaskets as the sealing element. Several conditions lead to oxidation and deterioration of these materials and their properties. In addition, the complex geometry of the gaskets and operation conditions may cause divergence in the expected aging behavior of the rubber. In light of this, this study aims to predict the service lifetime for nitrile butadiene rubber gaskets used in plate heat exchangers based on their geometry under thermo‐oxidative aging. These gaskets were evaluated by means of Shore A hardness, compression set (CS), and indentation modulus profile. Through aging‐sealing tests, an end‐of‐life criteria was determined concerning CS measurements and the service lifetime prediction was obtained by time–temperature superposition and WLF method. Diffusion‐limited oxidation effects were observed at high temperatures in postaging analysis and a non‐Arrhenius behavior was observed at 170°C. The value of 79% CS was obtained as end‐of‐life criteria from 60 to 140°C, ranged from 731 to 80 days, respectively, revealing an activation energy equivalent to 32.3 kJ mol−1. These results might support the maintenance planning control of gasketed plate heat exchangers.

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Tập 139 Số 28

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