All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, recording, or otherwise , without the prior written permission of the publisher. This standard has been prepared as part of the service of the ISA, the international society for measurement and control, toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static, but should be subject to periodic review.
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All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, recording, or otherwise , without the prior written permission of the Publisher.
This standard has been prepared as part of the service of ISA, the international society for measurement and control, toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static, but should be subject to periodic review. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general and the International System of Units SI in particular, in the preparation of instrumentation standards.
The Department is further aware of the benefits to users of ISA standards of incorporating suitable references to the SI and the metric system in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in all new and revised standards to the greatest extent possible. It is the policy of ISA to encourage and welcome the participation of all concerned individuals and interests in the development of ISA standards, recommended practices, and technical reports.
Participation in the ISA standards-making process by an individual in no way constitutes endorsement by the employer of that individual, of ISA, or of any of the standards that ISA develops.
The information contained in the preface, footnotes, and appendices is included for information only and is not a part of the standard. Skovgaard, Chairman W. Weidman, Managing Director G. Barb G. Borden, Jr. Bosserman S. Boyle R. Brodin L. Driskell A. Dvorak J. Glenn T. Kegel G. Kovecses A. McCauley, Jr. Leslie Controls, Inc.
Fisher Controls International Inc. Consultant Fisher Controls International, Inc. Ozol W. Rahmeyer G. Copes Vulcan, Inc. Weidman, Managing Director T. Addington H. Backinger G. Baenteli B. Barb H. Baumann K. Black H. Boger G, Borden, Jr. Brodin F. Cain C. Corson C. Driskell J. Fuller J. Griffith B. Hart F. Harthun B. Hatton R. Jeanes C. Koloboff G. Kovecses C. Langford A. Libke R. Louvieere O. Lovet, Jr. Miller T. Molloy L. Ormanoski J. Rahmeyer J. Fluid Controls Institute J.
Baumann Inc. Cashco, Inc. Fisher Controls International, Inc. Valtek International Fluor Daniel, Inc. Consultant Richards Industries, Inc. Consultant M. Kellogg, Company Consultant Honeywell, Inc. Control Components, Inc. NAME M. Bishop P. Brett W. Calder III H. Dammeyer R. Dieck W. Holland H. Hopkins A. Iverson K.
Lindner V. Maggioli T. McAvinew A. McFarland E. Montomery D. Rapley R. Reimer J. Rennie R. Webb W. Weidman J. Weiss J. Whetstone H. Wiggle C. Williams G. Wood M.
This standard also provides a procedure to evaluate the major data. Numerical constants for units of measurement used Upstream absolute static pressure, measured two nominal pipe diameters upstream of valve-fitting assembly Downstream absolute static pressure, measured six nominal pipe diameters downstream of valve-fitting assembly Pressure differential, p1-p2 Absolute vapor pressure of liquid at inlet temperature Volumetric flow rate Maximum flow rate choked flow conditions at a given upstream condition Valve Reynolds Number, dimensionless Absolute upstream temperature in K or degrees R Ratio of pressure drop to absolute inlet pressure?
Modeling of valves to a smaller scale is an acceptable practice in this standard, although testing of full-size valves or models is preferable. Good practice in modeling requires attention to significant relationships such as Reynolds Number, the Mach number where compressibility is important, and geometric similarity.
The piping on both sides of the test specimen shall be Schedule 40 pipe for valves through mm in. Pipe having mm 0. An effort should be made to match the inside diameter at the inlet and outlet of the test specimen with the inside diameter of the adjacent piping for valves outside the above limits. The inside surfaces shall be reasonably free of flaking rust or mill scale and without irregularities that could cause excessive fluid frictional losses.
ISA75.01, Control Valve Sizing Equations
Absolute thermodynamic critical pressures and temperatures for most fluids, and curves from which Z may be determined, can be found in many reference handbooks of physical data. The test fluid is usually water or air. The flow coefficient Cv and the factors FL , xT, etc. These data, along with factors to account for the actual fluid and the pipe configuration Fk , FF , Fp , etc. The principal use of the flow equations is to aid in the selection of an appropriate valve size for a specific application. In this procedure, the numbers in the equations consist of known values for the fluid and flow conditions and known values for the selected valve type at its rated opening. With these factors in the equation, the unknown or product of unknowns, e.
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