This case shows how a small defect in a multimedia filter caused major downstream consequences, compromised the integrity of reverse osmosis membranes, and demonstrated the importance of a robust, reliable design. What Was Observed The featured image was taken at the inlet of a reverse osmosis (RO) pressure vessel. It shows the multi-orifice protection cover
Failure in Multimedia Filters Read More »
A computational fluid dynamics (CFD) simulation was performed to study the effect of flue-gas velocity through the final-stage modules of a heat recovery steam generator (HRSG) preheater. Purpose The simulation produced a temperature map of the preheater module, making it easier to understand how energy is distributed across the tube bank. It also provided information
HRSG Preheater Simulation Read More »
The efficiency and reliability of a natural-circulation heat-recovery system depend on maintaining satisfactory boiling conditions throughout every evaporator module. Several factors must be optimized. Circulation Ratio The circulation ratio is the mass flow of circulating water divided by the steam flow. It can be understood as the number of times water circulates through the evaporator
Boiler Circulation Read More »
Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Morbi leo risus, porta ac consectetur ac, vestibu lum at eros. Nulla vitae elit libero, a pharetra augue.
Ullage System Enhancement Read More »
Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Morbi leo risus, porta ac consectetur ac, vestibu lum at eros. Nulla vitae elit libero, a pharetra augue.
Insights About Conductivity Read More »
Conductivity Changes Conductivity is an inherent property of water that measures the electrical current flowing through the ionic species in a solution; therefore, the higher the concentration of ions, the greater the likelihood of electrochemical reactions with the metal surface of the system that may precede corrosion. However, even considering high purity water, operational conditions
Conductivity Changes Read More »
CFD Drain System Description A simple modification in the engineering design may turn out to be of significant impact in the way systems perform and increase its functional reliability. This image presents a good example in which the blowdown drain system in a power plant was affected by severe flow-accelerated corrosion and fatigue-cracking. As a
CFD in Drain System Read More »
Heat-Affected Zone Circulation Ratio Heat-affected zone infiltration may be a potential cause of erosion/corrosion failures of carbon steel piping when exposed to a continuous stream of wet steam or feed water. The problem is associated with high-velocity and turbulences created by the presence of the welding penetration as a flow obstacle. The deterioration is developed
Heat-Affected Zone Read More »
Heat Transition Zone Introduction As superheated steam enters in the transition zone of the turbine and expands into LP section, steam may cross the saturation line, in the Mollier diagram, to eventually form nucleation of moisture drops on blades and disk surfaces. Consequently, a number of physical-chemical processes will lead to mechanical corrosion-related damage: precipitation
Superheated Transition Zone Read More »
