Emerson Y695A Scheda Tecnica Pagina 6
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Bulletin 74.2:Y695A
6
Table 6. Flow Rate Conversions (Gas ow required to displace
blanketing gas with pump-in of liquid.)
MULTIPLY MAXIMUM
PUMP RATE IN
BY TO OBTAIN
U.S. GPM
U.S. GPH
Barrels/hour
Barrels/day
8.021
0.1337
5.615
0.2340
SCFH air
required
(1)(2)
1. For liquids with a ash point below 100°F (38°C) or normal boiling point below 300°F
(149°C), multiply the above calculated outbreathing requirement by 2.0.
2. To convert to Nm³/h multiply SCFH by 0.0268.
1. Determine the ow rate of blanketing gas displaced
when liquid is being pumped in (see Table 6).
2. Determine the gas ow rate due to “outbreathing”
caused by atmospheric thermal heating (see
Table 7).
3. Add the requirements of steps 1 and 2 and select
a vapor recovery regulator size based on total
capacity required from Table 4.
Sample sizing problem for vapor
recovery applications:
Vessel capacity . . . . . . 1000 barrels (42,000 gal)(159 000 liters)
Pump in capacity . . . . . . . . . . . . . . . . . 20 GPM (75,7 l/min)
Inlet pressure source . . . . . . . . 60 psig (4,14 bar) nitrogen
Desired blanket setpoint . . . . . . . . 0.5-inches w.c. (1 mbar)
Desired vapor recovery setpoint . . . 2-inches w.c. (5 mbar)
Vapor recovery vacuum source . . . 5-inches Hg (169 mbar)
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hexane
Boiling point . . . . . . . . . . . . . . . . . . . . . . . . . . 155°F (68°C)
1. From Table 6 the desired air ow rate due to pump
in equals 20 GPM (75,7 l/min) x 8.021 x 2 = 321
SCFH (8,60 Nm
3
/h) air.
2. From Table 7 the desired air ow rate = 1000 SCFH
(26,8 Nm
3
/h) air due to thermal heating.
3. Total required ow rate = 1000 SCFH (26,8 Nm
3
/h)
air + 320 SCFH (8,58 Nm
3
/h) = 1320 SCFH
(35,4 Nm
3
/h) air. This converts to nitrogen
requirements of 1340 SCFH (35,9 Nm
3
/h).
Capacity Information
Table 4 gives typical nitrogen regulating capacities at
selected inlet pressures and outlet pressure settings.
Flows are in SCFH at 60°F and 14.7 psia and Nm³/h at
0°C and 1,01325 bar of 0.97 specic gravity nitrogen.
For gases of other specic gravities, multiply the
Table 7. Gas Flow Required for Thermal Heating (Outbreathing)
per API 2000 (Interpolate for intermediate sizes.)
VESSEL CAPACITY
SCFH (Nm³/h) AIR FLOW
RATE REQUIRED
Barrels Gallons Liters
Flash point is equal
to or above 100°F
(38°C) or normal
boiling point is
equal to or above
300°F (149°C)
Flash point is
below 100°F
(38°C) or
normal boiling
point is below
300°F (149°C)
60
100
500
1000
2000
2500
4200
21,000
42,000
84,000
9500
15 000
79 500
159 000
318 000
40 (1,07)
60 (1,61)
300 (8,04)
600 (16,1)
1200 (32,2)
60 (1,61)
100 (2,68)
500 (13,4)
1000 (26,8)
2000 (53,6)
3000
4000
5000
10,000
15,000
126,000
168,000
210,000
420,000
630,000
477 000
636 000
795 000
1 590 000
2 385 000
1800 (48,2)
2400 (64,3)
3000 (80,4)
6000 (161)
9000 (241)
3000 (80,4)
4000 (107)
5000 (134)
10,000 (268)
15,000 (402)
20,000
25,000
30,000
35,000
40,000
840,000
1,050,000
1,260,000
1,470,000
1,680,000
3 180 000
3 975 000
4 769 000
5 564 000
6 359 000
12,000 (322)
15,000 (402)
17,000 (456)
19,000 (509)
21,000 (563)
20,000 (536)
24,000 (643)
28,000 (750)
31,000 (831)
34,000 (911)
45,000
50,000
60,000
70,000
80,000
1,890,000
2,100,000
2,520,000
2,940,000
3,360,000
7 154 000
7 949 000
9 539 000
11 129 000
12 718 000
23,000 (616)
24,000 (643)
27,000 (724)
29,000 (777)
31,000 (831)
37,000 (992)
40,000 (1072)
44,000 (1179)
48,000 (1286)
52,000 (1394)
90,000
100,000
120,000
140,000
160,000
3,780,000
4,200,000
5,040,000
5,880,000
6,720,000
14 308 000
15 898 000
19 078 000
22 257 000
25 437 000
34,000 (911)
36,000 (965)
41,000 (1099)
45,000 (1206)
50,000 (1340)
56,000 (1501)
60,000 (1608)
68,000 (1822)
75,000 (2010)
82,000 (2198)
180,000 7,560,000 28 616 000 54,000 (1447) 90,000 (2412)
given capacity of nitrogen by 0.985, and divide by the
square root of the appropriate specic gravity of the
gas required. To determine regulating capacities at
pressure settings not given or to determine wide-open
ow capacities, use the following formula:
Where:
C
g
= gas sizing coefcient from Specications
C
1
= C
g
/C
V
or 35 from Specications
G = gas specic gravity (air = 1.0)
P
1abs
= inlet pressure, psia (add 14.7 psi to gauge inlet
pressure to obtain absolute inlet pressure)
Q = ow rate, SCFH
T = absolute temperature in °Rankine of gas at inlet
(°Rankine = °F + 460)
∆P = Pressure differential across the valve,
psig (P
1
- P
2
)
Q = C
g
P
1
SIN
520
GT
3417
C
1
∆P
P
1
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