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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page B-3

Fluid Calculations

Calculations for Steam T & P

When “Steam T & P” is selected in the “Real Gas” selection of the Fluid Menu,

the calculations are based on the equations below.

Density

The density of steam is calculated from the formula given by Keenan and Keys.

The given equation is for the volume of the steam.

v =

4.555.04 ● T

+ B

B = B

+ B

(τ) τ ● p + B

(τ)τ

● p

- B

(τ)τ

● p

- 1.89 - 2641.62 ● τ

1080870τ

(τ) = 82.546 ● τ 1.6246 ● 10

● τ

(τ) = 0.21828 - 1.2697 10

● τ

(τ) = 3.635 ● 10

-4

- 6.768 10

● τ

Where tau is 1/ temperature in Kelvin.

The density can be found from 1/(v/ standard density of water).

Viscosity

The viscosity is based on an equation given by Keenan and Keys.

η (poise) =

1.501

● 10

-5

√T

1 + 446.8 / T

Where T is the temperature in Kelvin.

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Onicon F-2600 Manuale Utente Pagina 124