Consistency and reliability are integral parts of any process. However, to effectively obtain this, there must be some sort standard to measure against. The Emerson EnTech specifications and guidelines are intended to act as a gauging tool by which performance can be measured, setting standards at what we believe to be reasonable, obtainable levels.  These publications are available in Adobe PDF format for download or on-line viewing.

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The consistency control loop is one of the most important loops in the pulp and paper mill as it determines the mass flow of fiber on which everything else depends. Applications range from the pulp mill through to the final point of dilution ahead of the paper machine. Consistency loop variability of 1% of mean is achievable, 0.5% is good, below 0.5% is excellent. This specification defines consistency control loop design and tuning criteria needed to minimize process variability. It is based on over a decade of experience.

Consistency Loop Dynamic Specification v1.0, 252k

This specification is aimed at providing a guide for control valve dynamic behaviour that is suitable for the highly competitive process industry environment. It is intended as a guide for end users to gauge control valve performance in-situ and also as a guide for both control valve purchase and sizing. While by no means 'the-last-word' in competitive control valve performance, the specification is intended to fill a void in an industry which has essentially no guidelines in this critically important area.
Regarding the Control Valve Specification:
We would like to applaud all of those who have adopted the EnTech Control Valve Specification as a guideline when ordering valves and for demanding supplier compliance. However there can be too much of a good thing, and care must be taken to ensure that these guidelines are applied properly. The specification applies to control valves and is designed to ensure that these valves respond to requested changes to accomplish reasonable regulation of the process. Under no circumstances does the specification apply to on/off valves and should never be used for this purpose.

SUMMARY: Control Valve Dynamic Specification v3.0, Summary, 32k

FULL COPY: Control Valve Dynamic Specification v3.0, Complete, 248k

This is a summary of a general set of recommendations aimed at helping pulp and paper mills manage process and product variability. It suggests a minimum set of standards for human awareness, knowledge and skills in the various aspects of the process control engineering discipline that is needed at each stage of a pulp and paper mill design, start-up and on-going operation/optimization.

Competency in Process Control - Industry Guidelines v1.0, 31k

This is a summary of a generic specification which applies to the design and dynamic performance of automatic feedback controllers suitable for use in optimizing pulp and paper mill process variability. The full document is available upon request.

Automatic Controller Dynamic Specification, 24k

This document is aimed at providing a design guide for sensor, transmitter and digital signal transmission equipment in order to ensure that the designs are capable of meeting the needs of process control, trouble shooting and data acquisition, especially at a time where there are increasingly urgent needs in the pulp and paper industry for greater product uniformity and operating efficiency.

Digital Measurement Dynamics - Industry Guidelines, 71k