VC series V-CONE FLOWMETER

2

TOKYO KEISO CO., LTD.

TG-F821-4E

The relationship between differential pressure (

∆P) and flow rate

(Q) is expressed by the following formula.

Q =

Q

: Flow rate [m

3/h]

β : Beta ratio

D

: Inside diameter of the pipe [m]

Cd

: Discharge coefficient

∆P : Differential pressure [kPa]

ρ : Density [kg/m3]

Y

: Gas expansion factor

Y = 1 – (0.649 + 0.696

× β4) × ∆P / (k × P)

k

: Specific heat ratio

P

: Line pressure [kPa]

4

× ρ × (1 – β4)

3600

× π × 2 × β2 × D2 × Cd × ∆P × 1000 × Y

STANDARD SPECIFICATION

● Connection size

: 15A (1/2”) to 400A (16”)

● Materials

: Stainless steel SS304 (Std.), SS316L

● Process connections

: Flange

● D.P. tappings

: Screw connection Rc1/2 or Rc1/4

● Contraction ratio (

β ratio)

: 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80

● Fluid temperature / Maximum operating pressure It depends on

the pressure and temperature rating of flange and its material.

(The following table is for reference only.)

Flange rating

JIS 10K

JIS 20K

Fluid temperature

(˚C)

Max. operating

pressure

(MPa)

∼

120

1.4

220

1.2

300

1.0

∼

120

3.4

220

3.1

300

2.9

400

2.3

● Uncertainty of discharge coefficient :

±2.0% (Standard)

Turn down ratio

: 10:1 (Standard)

Reynolds number

:

8000

Differential pressure

:

0.025kPa (Gas, Liquid)

:

0.05kPa (Steam)

● Required straight runs

[Measurement fluid : Liquids or Gases*1 or steam*1 (*1: Re 200,000)]

Joints

Upstream side

0D

0D

0D

✽3

2D

0D

2D

0D

0D

0D

0D

1D

0D

0D

1D

0D

1pc of 90

° bend

2pcs of 90

° bends

T joint

Butterfly valve (Flow control valve)

Butterfly valve (Full open)

Gate valve (Full open) /

Full port ballvalve (Full open)

Expander

(Inner diameter 0.67D

→ D, Length 2.5D)

Reducer

(Inner diameter : 3D

→ D, Length 3.5D)

Downstream side

✽3 Not Preferred Position

[Measurement fluid : Gases*2 or steam*2 (*2 : Re>200,000)]

1D

1D

1D

✽3

2D

1D

2D

0D

1D

1D

1D

1D

1D

1D

1D

0D

Joints

Upstream side

1pc of 90

° bend

2pcs of 90

° bends

T joint

Butterfly valve (Flow control valve)

Butterfly valve (Full open)

Gate valve (Full open) /

Full port ballvalve (Full open)

Expander

(Inner diameter 0.67D

→ D, Length 2.5D)

Reducer

(Inner diameter : 3D

→ D, Length 3.5D)

Downstream side

✽3 Not Preferred Position

[NOTES]

•D shows the nominal connection size of V-cone flowmeter.

• The required straight run is the distance from the flange face of V-

cone flowmeter.

• When

β ratio is 0.70 or more, add 1D to the above-mentioned value.

● Others: The products of non standard specifications are also avail-

able. Consult us for details.

OPTION

1) Differential pressure transmitters

FCX-A

3 FKC type

Refer to the technical guidance of FKC differential pressure trans-

mitters for detail specifications.

2) Three-way valve manifold

Material : SS316