Except for a few odd services, high liquid rate applications are typically the domain of either trays or random packings. Aside from the distributors, random packing designs are rather straightforward with the designer choosing the proper size to accommodate the fluid flow rates and achieve the desired efficiency. Trays, on the other hand, have a large variety of adjustable parameters and can be especially complex, especially when designed for high liquid rate applications.
Harmonics can have a detrimental effect on power generators and other sensitive electrical equipment for the user and utility alike. The number of adjustable speed drives (ASDs) has increased significantly in the past decade. Their contribution to the total electrical load of a power system is significant and cannot be neglected. This white paper discusses various passive techniques for reducing input current harmonics.
Dow Chemical maintains thousands of batch control systems world-wide built on its proprietary MOD 5 computer system. Over decades, they have been meticulous to preserve and enhance these systems. Dow intends to preserve and reap the rewards of this diligence by developing reverse engineering best practices and tools to migrate this intellectual property to next-generation platforms.
Batch manufacturing systems must maintain the status of equipment, including which are available, dirty, out of service, etc. In industries that enforce Good Manufacturing Practices (GMPs), additional status types and values for process equipment must be maintained. Rules associated with the equipment status can be complex and involve the equipment class, current equipment state and time in the current
state. This paper covers the operator interface used to review the equipment status and the interlocking requirements between the recipe and batch phases based on multiple status types.
This document describes best practices for the reference architecture for a process control system network and its interfaces to a corporate network. The papers objective is to give the reader an understanding of the techniques utilized to securely connect these networks.
Advanced diagnostics, some of which are available today, will go beyond alarming transmitter
failures to actually predict impending failures in the complete measurement system. This will
significantly reduce unscheduled shutdowns, and also reduce the risk of onscale failure.
Automation designers face many challenges and tradeoffs in the development of a successful network solution. This white paper discusses the necessary choices in selecting a network technology appropriate for various specific applications.
Calibrating your instruments using specialty gas will only yield results as accurate as your gas mixture. This three-page white paper discusses analytic traceability and how it relates to gas mixture accuracy.