Operation Manual

<11. MAINTENANCE>
11-6
IM 01F06A00-01EN
F1105.ai
Upstream
Number of bolts: 2
Number of bolts: 4
Number of bolts: 6
Upstream
Number of bolts: 10
Upstream
Upstream
g
h
fc
d
c
d
cd
e
f
e
c
d
e
f
g
h
i
j
k
l
Number of bolts: 8
Upstream
e
g
c
j
f
h
d
i
Figure 11.4 Procedure of tightening bolts
(e) Velocity (V)
V=N ×
1
¨t
×
1
KT
× U
KT
×
4
S×D
2
.... (11.7)
(f) Reynolds number (Re)
• Metric Units
Re=V × D × 
f
×
1
μ
× 1000 .... (11.8.1)
• English Units
Re=V × D × 
f
×
1
μ
× 124 .... (11.8.2)
Where
N: Number of input pulses (pulse)
t: Time corresponding to N (seconds)

f
: Instrumental error correction factor

e
: Expansion correction factor for
compressive fl uid

r
: Reynolds number correction factor
KT: K-factor at operating conditions (pulses/
litre) (pulse/gal)
KM: K-factor at temperature 15°C (59°F)
U
KT
: Unit conversion factor for K-factor
U
k
: Flow unit conversion factor (Refer to item
(2))
U
k(user)
: Flow unit conversion factor for user’s unit
U
TM
: Factor corresponding to fl ow unit time
(ex./m (minute) is 60.)
P
R
: Pulse rate (ex. E+ 3 is 10
3
.)
T
f
: Temperature at operating conditions (°C)
(°F)
F
S
: Flowrate span
T
R
: Total rate
D: Internal diameter (m) (inch)
 : Viscosity (mPa • s(cP))

f
: Density at operating conditions (kg/m
3
)
(lb/ft
3
)
11.6 Flow Calculation
(1) Flow Calculation
The fl owrate is calculated with the following
equations based on the N number of generated
vortices:
(a) Flow rate (in engineering units) (RATE)
RATE=N ×

1
¨t
× 
f
× 
e
× 
r
×
1
KT
 U
k
 U
TM
....(11.1)
• Metric Units
KT=KM × U
KT
× {1–4.81 × (T
f
–15) × 10
–5
}
.... (11.2.1)
• English Units
KT=KM × {1–2.627 × (T
f
–59)×10
–5
} .... (11.2.2)
(b) Flow rate (%) (RATE (%))
RATE(%)=RATE ×
1
F
S
× 100 .... (11.3)
(c) Totalized value (TOTAL)
TOTAL=TOTAL + TOTAL .... (11.4)
1
T
R
¨TOTAL=RATE × ¨t × ×
1
U
TM
.... (11.5)
(d) Pulse output frequency (PULSE FREQ)
• Scaled pulse
PULSE FREQ=RATE ×
1
P
R
×
1
U
TM
.... (11.6.1)
• Unscaled pulse
PULSE FREQ= N ×
1
¨t

1
P
R
.... (11.6.2)