




  Welcome to "SIZE" designed and developed by ANDERSON, GREENWOOD & CO..
  SIZE is a comprehensive and flexible sizing program for Safety Relief
  Valves. All equations and derivations have been obtained from
  established API, ASME, and standard thermodynamic fluid data.

  ANDERSON, GREENWOOD & CO. assumes no responsibility or liability in
  any way whatsoever for any resultant loss or damage through the
  application of this software.
  

                       Revision 2.2   July, 1990

    ͻ
     ANDERSON, GREENWOOD & CO. distributes this program free of charge.
     Unlike many copy-protected programs, feel free to copy this disk  
     for multiple internal or external distribution. AGCO only asks    
     that you register the program by sending your name, address and   
     current revision to the following address so we may send you      
     revisions as they occur and that this program not be altered in   
     any form. Thank You.                                              
    ͼ
         Anderson, Greenwood & Co.
         Relief Valve Sizing Software Registration
         3950 Greenbriar Drive
         Stafford, Tx 77477
         Attn: Sales Manager

         If you have any questions regarding the software contact
         Jim Foust at (713) 274-4400.

      SYSTEM REQUIREMENTS
      
      The basic system requirements are:

      - MS-DOS Version 2.1 or greater.
      - 512 Kb of main memory.
      - Monochrome video display.
      - One 360 Kb floppy and minimum 1.0 Mb free hard disk space.
      - A dot matrix printer for data sheet printout.

      SIZE comes on one 5.25 inch, 360Kb disk.
      SIZE will execute on any IBM XT/AT or any 100% compatible.

   HARD DRIVE INSTALLATION
   
   - Log on to the drive where SIZE is to reside.
   - Change to root directory by typing "CD\" and pressing <Enter>.
   - Create a directory called "AGCO" by typing "MD AGCO" and
     pressing <Enter>.
   - Change into this directory by typing "CD AGCO" and pressing
     <Enter>.
   - Now copy the furnished diskette into this directory on the hard
     drive by typing "Copy A:*.*" and pressing <Enter>.
   - SIZE has now been installed.
   - Type "MENU" to execute  program.










                         REPRESENTATIVE SCREEN

    This screen is to allow customized input of company information
    by the user. Type over current information and press ENTER to
    advance through the fields. When the Company name is changed,
    the revised name will appear on the print-out. Press the PgDn
    Key to advance to the sizing selection screen.


       ORIFICE CALCULATIONS FOR GAS/VAPOR, LIQUID, or STEAM

    - The Sizing Selection screen allows the selection of the
      method of sizing. This screen also allows you to change
      the calculation defaults for flow capacity in either
      scfm or lbs/hr. Press F4 to change units. The atmospheric
      pressure can also be changed to correspond to changes
      in enviromental factors. This screen also contains
      common metric conversion rates to English equivalents.

    - Press the appropriate Function Key and the corresponding
      input screen will appear for data entry. Use the <Enter>
      key to move within the fields.

    - When data is complete, press F1 for orifice calculation.
      Sub-routines will display the following:
          A) Calculated orifice area.
          B) Maximum flow capacity.
          C) Reactive force developed from momentum through
             the valve and the jet stream.
          D) Noise level at a distance of 3 feet in dBA

                           -MULTIPHASE FLOW-

     After orifice calculation, pressing Function Key F3 will
     enter the results into a mixed flow screen. Additional
     calculations can be entered and the screen will display
     a total of all data entered. Results can be edited with
     the <delete> key.

    - SIZE allows you to select the type valve for a specific
      service, and automatically recalculates orifice area
      based on the actual coefficient of discharge (Kd) for
      that specific valve. You may also select the "Other"
      option and enter your own model and Kd.

    - NOTE THAT ALTHOUGH ASME ALLOWS AN OVERPRESSURE OF 3 PSIG
      OR 10%, WHICHEVER IS GREATER, THIS PROGRAM USES THE CON-
      SERVATIVE FIGURE OF 10% FOR PRESSURES BETWEEEN 15-29 PSIG.


                            -API SPEC SHEET-

      After calculation of orifice area, press Function Key
      F2 to change screen to API format. Some data entry
      fields will display a pop-up menu for selection. You may
      select the entry by pressing the corresponding number, or
      select "OTHER" and type in any information you want. Others
      will be user keyed. When data is complete, type "Y" and
      press <ENTER> to PRINT, or F7 to SAVE to file for later recall.











            SIZING FORMULA FOR GAS/VAPOR IN SCFM

                    VxSQRT(MxTxZ)
              A =   _____________
                     6.32xCxKxP

  Where: A = Orifice Area in sq. in.
         V = Required Capacity in SCFM
         C = Gas Constant based on ratio of specific heats
         T = Inlet Temperature Absolute (deg F + 460)
         M = Molecular Weight of Gas
         P = Inlet Pressure, psia ( Set Pressure + Overpressure + 14.7)
         K = Valve Coefficient of Discharge
         Z = Compressibility Factor of Gas (1.00 if unknown)



              SIZING FORMULA FOR LIQUID RELIEF

                         GPM x SQRT (G)
              A =   _________________________
                    38xKxKpxKwxKvxSQRT(P1-P2)

  Where:   A = Orifice Area in sq. in.
         GPM = Flow in Gallons per Minute
           G = Gravity at Flowing Temp.
          P1 = Set Pressure + Overpressure, psig
          P2 = Backpressure, psig
           K = Valve Coefficient of Discharge
          Kp = Overpressure Correction Factor (1.00)
          Kw = Backpressure Correction Factor (1.00)
          Kv = Viscosity Correction Factor (1.00)



                    SAVING AND RECALLING A CALCULATION


          When a calculation is completed, it can be saved by pressing
          the Function Key F8. You can now enter project name and the data
          will be saved to that file. To recall a saved file, return to
          the main menu and press Function Key F6. A listing of all saved
          projects will appear. Tab to the project to recall and press
          ENTER. The list of calculations saved under this project name
          will be displayed. Use the cursor key to select the calculation
          for recall and press <ENTER>.

          Records within a file can be deleted individually, or a complete
          file can be deleted by pressing the Function Key F7 from the
          main menu.

          Files are saved on a program called custom.dbf. This file can
          be transfered to a floppy disk for storage, and later recall.
          WARNING: Do not erase this file from the program !












                            DEFINITIONS

    SAFETY VALVE: An automatic pressure relieving device actuated
    by the static pressure upstream of the valve, and characterized
    by rapid full opening or pop action. It is used for gas, vapor,
    or steam service.

    RELIEF VALVE: An automatic pressure relieving device actuated
    by the static pressure upstream of the valve, which opens in
    proportion to the increase on pressure over the opening pressure.

    SAFETY RELIEF VALVE: An automatic pressure actuated relieving
    device suitable for use as either a safety or relief valve,
    depending on application.

    SET PRESSURE: Set pressure, in pounds per square inch gage, is
    the inlet pressure at which the pressure relief valve is adjusted
    to open under service conditions.

    OVERPRESSURE: A pressure increase over the set pressure of a
    pressure relief valve, normally expressed as a percentage of
    set pressure.

    BLOWDOWN: The difference between actual opening pressure of
    a pressure relief valve and the actual reseating pressure,
    expressed as a percentage of set pressure or in pressure units.

    BACK PRESSURE: The static pressure existing at the outlet of a
    pressure relief device due to pressure in the discharge system.

    CONSTANT BACK PRESSURE: Back pressure which does not change
    appreciably under any condition of operation whether the valve
    is open or closed.

    VARIABLE BACK PRESSURE: This varies due to changes in operation
    of one or more pressure relieving devices connected into a
    common discharge header.

    BUILT UP BACK PRESSURE: Pressure existing at the outlet of a
    pressure relief device occasioned by the flow through that
    device into a discharge system.

    SUPERIMPOSED BACK PRESSURE: Static pressure existing at the
    outlet of a pressure relief device at the time the device is
    required to operate. It is the result of pressure in the
    discharge system from other sources.

    REACTION FORCE: The discharge of a pressure relief device
    imposes a reactive load on the valve and inlet piping
    opposite to the direction of exit of flow.













                      PILOT-OPERATED SAFETY RELIEF VALVES

                          AGCO VALVE MODEL NUMBERING

                                         4  2  3  10   J  23   /S1
                                         |  |  |  |    |  |     |
            Pilot Series  _______________|  |  |  |    |  |     |
                                            |  |  |    |  |     |
              2 = Series 200 Gas/Vapor      |  |  |    |  |     |
              4 = Series 400 Gas/Vapor/Liq. |  |  |    |  |     |
              5 = Series 500 Steam/Liq.     |  |  |    |  |     |
              6 = Series 600 Liq./Gas/Vapor |  |  |    |  |     |
              7 = Series 700 Steam/Gas      |  |  |    |  |     |
              9 = Series 900 Liq./Gas/Vapor |  |  |    |  |     |
                                            |  |  |    |  |     |
            Main Valve  ____________________|  |  |    |  |     |
                                               |  |    |  |     |
              2 = Full Lift, API               |  |    |  |     |
              3 = Restricted Lift, API         |  |    |  |     |
              7 = Full Lift, Full Bore         |  |    |  |     |
                                               |  |    |  |     |
            Seat Type  ________________________|  |    |  |     |
                                                  |    |  |     |
              3 = Soft Seat (O-Ring, or Plastic)  |    |  |     |
              6 = Teflon (226/526/576 only)       |    |  |     |
              7 = Metal Seat (727 only)           |    |  |     |
                                                  |    |  |     |
            Inlet Flange Rating, ANSI  ___________|    |  |     |
                                                       |  |     |
              05 = 150#                                |  |     |
              10 = 300#                                |  |     |
              12 = 600#                                |  |     |
              14 = 900#                                |  |     |
              16 = 1500#                               |  |     |
              18 = 2500#                               |  |     |
              XX = Special                             |  |     |
                                                       |  |     |
            Orifice Designation  ______________________|  |     |
                                                          |     |
              Letter = API Equivalent                     |     |
                -    = Full Bore                          |     |
                                                          |     |
            Inlet x Outlet, Inches  ______________________|     |
                                                                |
            Main Valve Materials  ______________________________|

              Blank = C.S. Body; S.S. & Plated C.S. Trim
                /S1 = C.S. Body; S.S. Trim
                 /S = S.S. Body & Trim
              /NACE = Compliance with NACE MR-01-75
               /SPL = Special (Consult Factory)

         ----------------END OF MANUAL----------------

  Press Ctrl C to exit or press any key for print-out of manual.
  At Directory Prompt, type "MENU" to execute program.
  Type "Y" at prompt for Terminate Batch Job (Y/N).




         ----------------end-of-author's-documentation---------------

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