ANSI FCI 99-2-2015 Pressure Reducing Regulator Capacity.pdf

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1、 ANSI/FCI 99-2-2015 AMERICAN NATIONAL STANDARD PRESSURE REDUCING REGULATOR CAPACITY Fluid Controls Institute, Inc. Sponsor: Fluid Controls Institute, Inc. 1300 Sumner Ave Cleveland, Ohio 44115-2851 iiANSI/FCI 99-2-2015 AMERICAN NATIONAL STANDARD Pressure Reducing Regulator Capacity Sponsor Fluid Con

2、trols Institute, Inc. AmericanNationalStandardAmerican National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an America

3、n National Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cau

4、tioned to obtain the latest editions. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the dat

5、e of publication. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Sponsored and published by: FLUID CONTROLS INSTITUTE, INC. 1300 Sumner Avenue Cleveland, OH 44115-2851 Phn: 216/241-7333 Fax:

6、216/241-0105 E-Mail: fcifluidcontrolsinstitute.org URL: www.fluidcontrolsinstitute.org Copyright 2015 by Fluid Controls Institute, Inc. All Rights Reserved No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission

7、of the publisher. Suggestions for improvement of this standard will be welcome. They should be sent to the Fluid Controls Institute, Inc. Printed in the United States of America iiiivCONTENTS PAGE Foreword .v 1. Purpose .1 2. Scope 1 3. Definitions 1-2 4. Test Method . 2-4 5. References . 4 vForewor

8、d (This foreword is included for information only and is not part of ANSI/FCI 99-2-2015, Pressure Reducing Regulator Capacity) This voluntary standard has been compiled by the Regulator Section of the Fluid Controls Institute, Inc. It has been developed to provide a test methodology for measuring an

9、d reporting the capacity of pilot operated and direct acting pressure reducing regulators. The standard was originally approved in 2004. The section reaffirmed the standard. FCI recognizes the need to periodically review and update this standard. Suggestions for improvement should be forwarded to th

10、e Fluid Controls Institute, Inc., 1300 Sumner Avenue, Cleveland, Ohio 44115-2851. All constructive suggestions for expansion and revision of this standard are welcome. The existence of a Fluid Controls Institute (FCI) standard does not in any respect preclude any member or non-member from manufactur

11、ing or selling products not conforming to this standard nor is the FCI responsible for its use. Please go to the FCI web site for all of the latest technical articles and standards. 1ANSI/FCI 99-2-2015 AMERICAN NATIONAL STANDARD Pressure Reducing Regulator Capacity 1. PURPOSE This standard creates a

12、 guideline for establishing and reporting regulator capacities for use by manufacturers, users, specifiers and approval bodies in order to promote consistent presentation of regulator capacities. 2. SCOPE To provide a test methodology for measuring and reporting the capacity of pilot operated and di

13、rect acting pressure reducing regulators. 3. DEFINITIONS 3.1 Accuracy of Regulation. The deviation from the set point, expressed as a percentage or as a fixed unit, taken at the test conditions. 3.2 Controlled Variable. The variable which shall be monitored by the controlling process. This variable

14、is either the outlet pressure or the differential pressure. 3.3 Lockup (Dead End Shutoff). The deviation of the controlled variable from set point obtained at a no flow condition. 3.4 Maximum Capacity. The flow rate at maximum travel generally used for safety or relief valve sizing. 3.5 Maximum Cv.M

15、aximum Cvis Cv at maximum capacity calculated per ISA S75.01 generally used for safety relief valve sizing. 3.6 Minimum Controllable Flow. The lowest flow rate, at a given set point and temperature, at which a steady regulated condition of the controlled variable can be maintained. The minimum contr

16、ollable flow is essentially zero for some regulators. Minimum controllable flow is used to determine turndown or rangeability. 3.7 Offset. The deviation of the controlled variable measured as the flow varies from the minimum controllable flow to the rated capacity. Offset is sometimes referred to as

17、 droop for pressure reducing valves. 3.8 Rated Capacity. The rate of flow obtainable through a regulator, for specified inlet and outlet conditions and fluid, at a specified offset or accuracy of regulation. 3.9 Rated Cv. Rated Cv is measured at rated capacity as calculated per ISA S75.01. 3.10 Rate

18、d Rangeability (Turndown). The rated capacity divided by the minimum controllable flow, usually expressed as a percentage. 3.11 Set Flow. The flow rate used to obtain the set point, typically 5 to 10% of rated capacity. 3.12 Set Point. The regulator adjustment corresponding to the desired value of t

19、he controlled variable. 3.13 Spring Range. The useable pressure range for a spring. Data is assumed to be taken at the midpoint of a spring range or temperature bulb unless otherwise noted. 4. TEST METHOD: PRESSURE REGULATORS 2T1 P1 P2 T2 Test Regulator Flowmeter Primary Pressure Temperature Sensor

20、Discharge Reservoir Flowmeter (Alternate location)Downstream Throttling Valve Secondary Pressure Temperature SensorSupply Pressure Gage Fluid Source Supply Valve Figure 1 Inlet Test Regulator D Figure 2 Flow P1 5 D* 2 D 5 D* 1 D P2Outlet *The pipe length upstream of the P1 pressure tap must be long

21、enough to allow the fluid medium to stabilize after passing through an elbow or valve. In some cases, a pipe length of greater than 18 pipe diameters may be needed. Straightening vanes may be added to the I. D. of the pipe to reduce the required length of upstream piping.34.1 Suggested test set up a

22、nd equipment is shown in Figure 1. Assure that all equipment has flow and pressure ratings equal to or greater than that expected in the test. Test set up can be per ISA 75.02.01 and ANSI B109.4. Accuracy of Instruments is also covered in these standards. 4.2 Insure the Flow Meter is installed in ac

23、cordance with the manufacturers recommendations. Note that the Flow Meter can be located anywhere in the flow stream. 4.3 Use appropriate size conduits and fittings to connect the test unit in the test stand to prevent conduit flow restrictions from adversely influencing the test. 4.4 Pressure taps

24、P1 and P2 to be located in the test setup as defined in Figure 2. 4.5 Assure that the test fluid is properly filtered before it enters the test stand to protect test regulator and instrumentation. 4.6 With the supply valve and downstream throttling valve closed, install the pressure regulator to be

25、tested. 4.7 Adjust the supply pressure of the fluid source to that required for the test. 4.8 Open the supply valve and assure there are no leaks in the setup. Verify the primary pressure, P1, is correct and maintained during the test. 4.9 Adjust the pressure regulator to be tested to the test setpo

26、int. Adjustments to the downstream throttling valve may also be required to position the setpoint at a minimum controllable flow. 4.10 Beginning with the downstream throttling valve closed, proceed to open the downstream throttling valve in a number of incremental steps to produce various flow rates

27、 through the test pressure regulator. Verify the primary pressure, P1, is maintained during the test. 4.11 Produce sufficient incremental flow rate steps to obtain a factual representation of the test regulators performance. Closely spaced data points will be required in the low flow region and high

28、 flow region for accurately determining lockup, minimum controllable flow, and maximum flow capacity. 4.12 Record the pressures P1, and P2, temperatures T1, and T2, and flow rate for each incremental increasing step in throttle valve opening. 4.13 Calculate the flow rate from the recorded data of fl

29、ow, pressure, and temperature. 4.14 From the recorded and calculated data, plot a performance curve of the secondary pressure vs. flow rate through the regulator. 4.15 Establish the desired accuracy of regulation and measure the rated capacity at that point. 4.16 Minimum controllable flow, lockup, a

30、nd maximum capacity can also be determined from the performance curve. (see Figure 3) 4.17 If desired, repeat steps 4.5. thru 4.11. for additional representative setpoints in the units regulating range from which a family of performance curves can be generated. 4.18 Optionally the rated and maximum

31、Cv can be determined per ISA S75.01. 4.19 The rated capacity shall always be presented graphically or in tables. The fluid, setpoint, minimum flow and accuracy of regulation (or offset) shall always be specified with the capacity information. All published Cvvalues shall be defined as either rated o

32、r maximum values. Pressure Regulator Flow Characteristics MAXIMUM CAPACITY SET POINT AND SET FLOW CONTROLLED VARIALBE OUTPUT PRESSURE (PSIG) OFFSET (DROOP) SET POINTLOCKUP RATED CAPACITY REGULATOR FLOW (SCFM, GPM, #/HR) Figure 3 5. REFERENCES 5.1 Fluid Controls Institute, FCI 86-2, Regulator Termino

33、logy. 5.2 International Society of Automation, ANSI/ISA 75.02.01 (IEC 60534-2-3 Mod), Control Valve Capacity Test Procedures . 5.3 International Society of Automation, ANSI/ISA 75.01.01 (60534-2-1 Mod), Industrial-Process Controls Valves Part 2-1: Flow Capacity Sizing Equations for Fluid Flow Under

34、Installed Conditions. 5.4 CEN European Committee for Standardization, rEN334, Gas Pressure Regulators for Inlet Pressures up to 100 bar. 5.5 American National Standards Institute, Self-Operated Diaphragm-Type Natural Gas Service Regulators, ANSI B109.4 45ADDITIONAL FCI REGULATOR STANDARDS FCI 70-1,

35、Standard Terminology and Definition for Filled Thermal Systems for Remote Sensing Temperature Regulators ANSI/FCI 70-3, Regulator Seat Leakage ANSI/FCI 79-1, Standard for Proof of Pressure Ratings for Pressure Regulators FCI 86-2, Regulator Terminology ANSI/FCI 99-3, Standards for Backpressure Regul

36、ator Capacity ANSI/FCI 4-1, Pressure Regulator Hydrostatic Shell Test Method FCI 15-1, Standard for Production Testing for Regulators FCI REGULATOR TECHNICAL BULLETINS Tech Sheet #CVR 401 Insulation Systems Used as External Treatment for Control Valve and Regulator Noise Tech Sheet #CVR 402 Fundamental Principles of Self-Operated Pressure Reducing Regulators Tech Sheet #CVR 403 Laminar Flow Valve Sizing Made Easy Tech Sheet #CVR 404 Simple Reference Guide: Differences Between Direct and Pilot-Operated Regulating Valves