Petrochemicals

Objectives of Anti-Surge Control

Mar 15, 2011
W. Brian Piercy
Objectives of Anti-Surge Control Preventing a compressor surge is the primary purpose of an anti-surge controller. However, there are additional requirements that must be met for an anti-surge control package to be effective. It must be stable and reliable, while also keeping energy costs to a...

Trip & Throttle Valve Reliability

Mar 15, 2011
Joan del Castillo
Trip & Throttle Valve Reliability Trip & Throttle (or Stop) valves are used in ethylene plants to isolate the energy to steam turbines when required. They are critical Safety Protection components with a high impact on a plant’s reliability; however, they operate under tough conditions like...

Mitigation of Preheat Fouling by Eliminating the Cause

Mar 15, 2011
Irv Wiehe
Today, there is no excuse for not getting five years or more on the run length of refinery preheat exchangers without the need for cleaning. Among the many tools available for fouling mitigation of preheat exchangers, the most overlooked ones involve determining and eliminating the cause. Almost...

Ethylene Boil-off Compressor Process Safety Incident

Mar 15, 2011
Niara Eckhard Uhlein
Braskem, a Brazilian player among petrochemical manufacturers, produces monomers, resins and chemicals specialties. The overall Ethylene capacity is 3,600 KTA, distributed in six Olefins plants. Naphtha is the main raw material of the petrochemical and plastic productive chain in Brazil, followed...

Operational Inputs Into the Mechanical Integrity Program

Mar 15, 2011
F. Russ Davis
A predictive mechanical integrity (MI) program is based on the following: * Damage mechanisms that affect process equipment. * Rate at which degradation progresses. * Ability of the inspection group to identify and correct equipment damage before equipment failure. Operational temperature, pressure...

Practices to Mitigate NOx Risk In Cryogenic Section of Ethylene Plants

Mar 15, 2011
Jennifer L. Bancroft
In May 2010 the Ethylene Producers Committee NOx Safety Sub-Committee sponsored a discussion on practices to mitigate NOx risk in the cryogenic section of ethylene plants. The meeting was attended by representatives of 10 ethylene producers, 4 ethylene contractors and other contractors, 2 additive...

Advanced Hydrogen Management : More Than a Balancing Act

Mar 15, 2011
Sanjiv Ratan
Modern high complexity refining landscape involves increasing proportion of “opportunity crude” processing and widened bottom-of-the-barrel strategies, which together with ever stringent ‘clean fuels’ requirements has led to extensive need for hydrogen and its optimization in the refinery. This in...

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