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Corrosion is a ubiquitous phenomenon, which can have massive impacts on the functioning of industrial assets. The threat of corrosion is exacerbated in situations where regular corrosion inspections are difficult. The Virtual Corrosion Engineer (VCE) Project within Shell is intended to offer a solution to this problem by automatically assessing the corrosion rates and threat levels in assets due to a variety of corrosion mechanisms. The VCE system has been deployed in an asset progressively since 2019.
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Gas Oil Hydrotreating Unit uses a catalytic hydrotreating process employing a selective catalyst and a hydrogen-rich gas stream to decompose organic sulfur, oxygen and nitrogen compounds contained in the feed. The products of these reactions are the contaminant free hydrocarbon, along with H2S and NH3. Other Treating reactions include halide removal and aromatic saturation. Reactor effluent is cooled in series of Combined Feed Exchangers followed by REAC for product separation. The reactor effluent system is prone for corrosion and fouling due to salting of NH4HS and NH4Cl. Most of the failure analysis studies and literature available in public domain regarding reactor effluent corrosion deals with the corrosion in the REAC and its outlet piping.
HISTORICAL DOCUMENT. This is the reprinted version of TM0169-1976. This document was reprinted:
May 1994
May 1992
September 1991
Revised 1976
Revised 1972
Approved March 1969
A laboratory test method for determining the extent and rate of corrosion of metals in high-temperature water at temperatures greater than 100°C (212°F) but less than approximately 360°C (680°F). Historical Document 1995
This document…is directed toward the testing of metals for resistance to cracking failure in aqueous environments containing H2S. Historical Document 1990
The testing of metals for resistance to cracking failure under the combined action of tensile stress and corrosion in aqueous environments containing hydrogen sulfide (H2S)...termed sulfide stress cracking (SSC) Historical Document 1996
Test method…to evaluate and compare the corrosion protection that various internal plastic coatings afford oilfield tubular goods…with flowing water at a given velocity under controlled temperatures for a specified period of time. Historical Document 1993
Method for measuring the relative corrosivity of inhibited solutions used for chemical cleaning in a static system. The tests consist of exposing metallic coupons to cleaning solvents under controlled conditions. Historical Document 1993
Field test methods for estimating bacterial populations commonly found in oilfield systems. Historical Document 1994
Test method to screen scale inhibitors for their ability to prevent precipitation of BaSO4 and/or SrSO4 from oilfield brines. Historical Document 1997
This standard establishes a SSR test method for screening CRA materials (i.e., stainless steels and nickel-base alloys) for resistance to SCC at elevated temperatures in sour oilfield production environments. Historical Document 1998
A pilot plant method for determining the extent and rate of uniform corrosion of metals in circulating, high temperature water or aqueous solutions at temperature >100 C (212 F) but < ~360 C (680 F). Historical Document 1974