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General Notes:

Note: Refer to the "Terms and Conditions" in the 'About' section before using the software.

1) Orifice Plate Sizing is a software program that can be used to determine the bore (d in inches) of measurement orifice plates.

2) The available pipe sizes vary from 2 in to 36 in.

3) The procedure is based on ASME MFC-3M 2004 Ed / 2007 Addenda.

4) Equations used :-

qm = 0.09970190 * C * Y * d^2 * SQRT ((hw * rho1) / (1 - beta^4)).

C = 0.5961 + 0.0261 * BR^2 - 0.216 * BR^8 + 0.000521 * (10^6 * BR / RD) ^ 0.7 + (0.0188 + 0.0063*A) * BR^3.5
* (10^6/RD)^0.3 + (0.043 + 0.080 * e^(-10*L1) - 0.123*e^(-7*L1)) * (1- 0.11*A) * (BR^4/(1-BR^4)
- 0.031 * (M2' - 0.8 * M2'^1.1) * BR^1.3

When D < 71.12 mm (2.8 in), the following term shall be added to the above equation.
+ 0.011 * (0.75 - BR) * (2.8 - D) [ D - Pipe ID, D in inches, D/25.4 in place of D if D is in mm (SI units) ]

BR = d/D; RD - Pipe Reynolds Number; L1 = l1/D; L2' = l2'/D; M2' = (2 * L2')/(1-BR); A = (19000 * BR / RD)^0.8;

a) for Corner Taps: L1 = L2' = 0; b) for D and D21 taps: L1 = 1; L2' = 0.47; c) for Flange taps: L1 = L2' = 1/D; [D, in or D/25.4, mm]

Expansibility Factor, Y = 1 - (0.351 + 0.256*BR^4 + 0.93*BR^8) * [1 - (P2/P1)^(1/k)];

Pressure Loss, h = (NUM/DENOM) * (0.03606 * hw) ; hw - Differential pressure (in of H2O)

NUM = SQRT[ 1 - BR^4 * (1 - C^2)] - C * BR^2 ; DENOM = SQRT[ 1 - BR^4 * (1 - C^2)] + C * BR^2 ;

Limits of Use. Standard orifice plates shall only be used in accordance with the code clause under the following conditions:

(a) For orifice plates with corner or with D and D/2 pressure taps
(1) d >= 12.5 mm (0.5 in.)
(2) 50 mm (2 in.) <= D <= 1000 mm (40 in.)
(3) 0.10 <= BR <= 0.75;
(4) RD >= 5000 for 0.10 <= BR <= 0.56
(5) RD >= 16000 * BR^2 for BR > 0.56

(b) For orifice plates with flange taps
(1) d >= 12.5 mm (0.5 in.)
(2) 50 mm (2 in.) <= D <= 1000 mm (40 in.)
(3) 0.10 <= BR <= 0.75
(4) RD >= 5000 and RD >= 170 * BR^2 * D, (D, mm)
(5) RD >= 5000 and RD >= 4318 * BR^2 * D, (D, in.)

5) If you notice any error, please let us know, so that can be rectified.

6) Contact us with any comments / questions : engineeringstream11@gmail.com

7) Visit us for more software programs at https://engineering-stream.com