Emerson Y690A Datasheet Page 6
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Bulletin 74.1:Y690A
6
BLANKET GAS SPECIFIC GRAVITY CORRECTION FACTOR
Natural Gas 0.60 1.270
Air 1.00 0.985
Dry CO
2
1.52 0.797
Correction Factor =
Table 8. Flow Rate Conversion
MULTIPLY MAXIMUM
PUPM 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)
1. To convert to Nm
3
/h multiply SCFH by 0.0268.
0.985
SG
Table 7. Correction Factors (for converting nitrogen ow rates
to other gas ow rates)
Product Description
Y690A Series Pressure
Reducing Regulators
Very low-pressure (Types Y690A and Y690AM)
and higher-pressure versions (Types Y690AH and
Y690AHM) are available for operating inlet pressures
up to 150 psig (10,3 bar) and outlet pressures settings
from 1-inch w.c. to 7 psig (2 mbar to 0,48 bar). Refer
to Table 5 for outlet pressure ranges of each type.
These regulators are available in NPS 3/4 and 1
(DN 20 and 25) body sizes with the end connections
as shown in Table 1.
Downstream Control Line
Types Y690AM and Y690AHM regulators have
a blocked throat stem seal with O-rings and a
1/2 NPT control line connection in the diaphragm
case (Figure 2). The control line can be used to
more accurately control the pressure in the tank if the
regulator is mounted an extended distance from the
control point. The stem seal separates the body outlet
pressure from the diaphragm case.
Sliding Pusher Post
The diaphragm assembly of the regulator is equipped
with a sliding pusher post. During an overpressure
situation (outlet pressure above setpoint or lockup
pressure), the spring of the sliding pusher post is
compressed, allowing the diaphragm head to come
to rest on the spring case. This action prevents any
damage to internal parts.
Sizing Blanketing Systems
When sizing a gas blanketing regulator system for
a low-pressure blanketing application, you must
consider the replacement of blanketing gas required
for the liquid loss during pump out of the vessel plus
the condensation/contraction of vessel vapors during
atmospheric thermal cooling. Using the established
procedures from American Petroleum Institute
Standard 2000 (API 2000), determine the ow rate of
blanketing gas required.
1. Determine the gas ow rate required to replace
the liquid being pumped out (see Table 8).
2. Determine the gas ow rate due to “inbreathing”
caused by atmospheric thermal cooling
(see Table 6).
Table 6. Vessel Capacity
VESSEL CAPACITY
SCFH (Nm
3
/h) AIR FLOW
RATE REQUIRED
(1)
Barrels Gallons Liters
60
100
500
1000
2000
2500
4200
21 000
42 000
84 000
9500
16 000
79 500
159 000
318 000
60
100
500
1000
2000
(1,6)
(2,7)
(13,4)
(26,8)
(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
3000
4000
5000
10 000
15 000
(80,4)
(107)
(134)
(268)
(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
20 000
24 000
28 000
31 000
34 000
(536)
(643)
(750)
(831)
(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
37 000
40 000
44 000
48 000
52 000
(992)
(1072)
(1179)
(1286)
(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
56 000
60 000
68 000
75 000
82 000
(1501)
(1608)
(1822)
(2010)
(2198)
180 000 7 560 000 28 616 000 90 000 (2412)
1. Flash point is below 100°F (38°C) or normal boiling point is below 300°F (149°C).
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