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Boucherville, Canada

Ultragen Ltd. | Date: 2014-12-23

Medical device for the treatment, contouring and tightening of the skin and cellulite reduction, in the aesthetic field.

Ayari H.,Ultragen Ltd. | Truong D.,Ultragen Ltd. | Truong K.T.,Ultragen Ltd.
Hydrocarbon Processing

Damage from corrosion mechanisms often leads to failure in refinery equipment and creates safety hazards, which interrupt refinery operations. The corrosion-under-insulation phenomenon occurs in insulated vessels when the vessel shell is in continuous contact with insulation that has become wet, thus enabling oxidation and loss of material. A numerical approach using the finite element technique to analyze a tower subject to post-weld heat treatment (PWHT) in the field is presented. In accordance with the NBC2005 design parameters, the minimum required thicknesses, and the induced loads due to the weight and wind, were obtained. The calculated strains for the PWHT operation were compared with 0.2% strain "margin". The calculated thermal strain around the PWHT area was 0.122% (maximum). Thermal analysis revealed that the temperature around the treated area should be maintained from 600° to 700°F to not induce excessive stresses and deflection. The PWHT patch length of the tower studied should be limited to 1-4 of vessel perimeter and during PWHT, the wind velocity should not exceed 50 km/hr to ensure 33% of design wind load applied on the tower. This numerical approach can be generalized and applied for different sizes of the corroded vessel subjected to in situ PWHT. Source

Ayari H.,Ultragen Ltd. | Truong D.,Ultragen Ltd. | Sehn J.,Ultragen Ltd. | Truong K.T.,Ultragen Ltd.
Journal of Pressure Vessel Technology, Transactions of the ASME

An internal floating roof is to be installed on an existing large API storage tank. In order to ensure the proper functionality of the roof, the deformation of the shell has been monitored and analysed. The measurements on the shell ovality show that the actual radial deformation is beyond the acceptable limit for installation of a serviceable internal floating roof and corrective actions should be taken. Consequently, a series of tests and analyses were performed to provide a recommended practice to restore the tank to its round shape. Copyright © 2014 by ASME. Source

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