A new methodology for hydro-abrasive erosion tests simulating penstock erosive flow

28th IAHR symposium on Hydraulic Machinery and Systems

Aumelas, V.^1 ; Maj, G.^1 ; Le Calvé, P.^2 ; Smith, M.^3 ; Gambiez, B.^4 ; Mourrat, X.^4

YLEC Consultants, 24 Blvd de la Chantoume, La Tranche

38700, France^1

ANTICORR Conseil, 15bis rue Kerdavid, Lanester

56600, France^2

EXPIRIS, 3 rue F.J. Strauss ZAC Aéroconstellation, Blagnac

31700, France^3

EDF CIH, 5 Avenue du Lac du Bourget, Le Bourget-du-Lac

73370, France^4

关键词: Abrasive resistance;    Application method;    Coating performance;    Experimental characterization;    Experimental devices;    Hydraulic application;    Laboratory apparatus;    Property requirements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/12/122012/pdf
DOI  :  10.1088/1755-1315/49/12/122012

来源: IOP

【 摘 要 】

Hydro-abrasive resistance is an important property requirement for hydroelectric power plant penstock coating systems used by EDF. The selection of durable coating systems requires an experimental characterization of coating performance. This can be achieved by performing accelerated and representative laboratory tests. In case of severe erosion induced by a penstock flow, there is no suitable method or standard representative of real erosive flow conditions. The presented study aims at developing a new methodology and an associated laboratory experimental device. The objective of the laboratory apparatus is to subject coated test specimens to wear conditions similar to the ones generated at the penstock lower generatrix in actual flow conditions. Thirteen preselected coating solutions were first been tested during a 45 hours erosion test. A ranking of the thirteen coating solutions was then determined after characterisation. To complete this first evaluation and to determine the wear kinetic of the four best coating solutions, additional erosion tests were conducted with a longer duration of 216 hours. A comparison of this new method with standardized tests and with real service operating flow conditions is also discussed. To complete the final ranking based on hydro-abrasive erosion tests, some trial tests were carried out on penstock samples to check the application method of selected coating systems. The paper gives some perspectives related to erosion test methodologies for materials and coating solutions for hydraulic applications. The developed test method can also be applied in other fields.