Chevron U.s.a. Inc.

David Lawrence Cooke

Grzegorz Jan Kusinski

Jeff Johns

Edwin Hall Niccolls

Steven Alden Souers

Andrew Thomas O'Connor

Douglas Gayle McDaniel

David Michael Bosi

Kyrolos Paul El Giheny

Sara Christine Parten

Benjamin Roy Crowder

Eugene Vladimirovich Stepanov

Teppei Suzuki

Bart Quentin Welch

Processes for shutting down a hydroprocessing reactor and for removing catalyst from the reactor may comprise shutting off hydrocarbon feed to the reactor, stripping hydrocarbons from the catalyst, cooling the reactor to a first threshold reactor temperature, purging the reactor with Ngas, introducing water into the reactor, and dumping the catalyst from the reactor, wherein the first threshold reactor temperature may be substantially greater than 200&#xb0; F. In an embodiment, the water may be introduced into the reactor via a quench gas distribution system when the reactor is at a second threshold reactor temperature not greater than 200&#xb0; F. to cool the reactor to a third threshold reactor temperature not greater than 120&#xb0; F.

Method for safely and quickly shutting down and cleaning a hydroprocessing reactor of spent catalyst via a water flooding technique

A method for forming structural equipment employed in sulfur containing environments such as oil refineries and the like. In one embodiment, the method comprises: providing a steel composition containing up to 0.35% of C, 0.30 to 3.5% Si, up to 1.2% Mo, up to 1.35% Mn, up to 5% Al, less than 12.0% Cr, balance of Fe and unavoidable impurities; forming a structural component conforming to prevailing industry standards with respect to design, fabrication, inspection and testing, metallurgical and mechanical properties. The structural equipment has a corrosion rate of less than 15 mpy. In one embodiment, the equipment is formed from a steel composition has a carbon equivalent of less than 0.63, requiring no post weld heat treatment ('PWHT'). In another embodiment, the CE is less than 0.45, requiring no preheat nor PWHT.

Equipment for use in corrosive environments and methods for forming thereof

Systems and methods for evaluating the corrosion risk in operations with equipment for the handling an acid gas-containing solutes, e.g., an amine unit for the removal of acid gases such as HS, CO, etc., are provided. Input parameter values corresponding to geometrical parameters of at least an equipment (or a portion of an equipment) susceptible to corrosion risk, operating parameters, fluid dynamic properties, and properties of the solute are received by the system. Based on the input values, the systems and methods derive a minimum pressure above which acid gas flashing occurs given the localized pressure drop, causing corrosion in the identified location. In one embodiment, the systems and methods provide an assessment correlating acid gas loadings with the corrosion risk.

Processes and systems for predicting corrosion

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San Rafael, CA, United States of America

David Lawrence Cooke