Temperature Variations of Air Pocket in Type-3 Composite Vessel during Ambient Hydraulic Cycling Test

ABSTRACT This research aims to increase the reliability and reproducibility of the ambient cycling test by properly making corrections to the test procedure. The vessel (106 L) is initially filled with 70 L of water and horizontally placed on a balance. The pressure range inside the vessel varies from 2.5 to 25.9 MPa at the frequency of 6 cycles per minute. After reviewing the results, there was a temperature difference of approximately 10 °C between the air pocket and the water, and the upper part of the liner faced a repeated temperature change of 40 °C. It is possible for the aluminum liner of the composite vessel to be damaged by such a sharp change in temperature. Additionally, as a result, no pass having anything to do with the purpose of the test would occur. Therefore, it is suggested that the air pocket be completely removed.KeyWords : Ambient Hydraulic Cycling Test(상온수압반복시험), Type3 Composite Vessel( 3 ),타입복합재용기 Internal Temperature Variations(내부온도변화) # Corresponding Author : sklyu@gnu.ac.kr Tel: +82-55-772-1632, Fax: +82-55-772-1578