NorriSize™
Valve Sizing Program
version 3.0
Introduction
NorriSize™, the Norriseal Valve Sizing Program, enables one to calculate the required Cv, Flow Velocity, Mach Number and Flow Noise based on a given set of parameters, and aids the user in determining the appropriate valve selection for a fluid service application. The program can automatically provide values for many common fluids; however, the user’s knowledge of the environment is essential for proper valve selection for any service application. It is ultimately the user’s responsibility to assure the data used for calculations is correct.
Version 3.0 of the program has been written from the ground up, and represents an overwhelming improvement over version 2.x in terms of program interaction and interface design. Efforts have been focused on providing a flexible, project based environment and modularizing the interface to cleanly separate project management tasks from valve sizing. New features include the display of Cv curves, expanded printing options, a simple address book and persistent user preferences which make the program a more effortless tool for sizing valves.
Flow coefficients are calculated using the latest ISA standard S75.01.01-2002 Flow Equations for Sizing Control Valves. Unfortunately, there has been no progress in the draft standard dS75.07.01, so noise prediction is still calculated using ISA standard S75.17-1989 Control Valve Aerodynamic Noise Prediction. Calculation accuracy has been improved over the previous version by implementing a more robust specific gravity calculator and expanding fluid property temperature ranges. Calculation messages have been improved to provide the user with information to correct the problem which causes the message to appear.
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