Optional materials are available for applications
handling sour gases. These constructions comply
with the recommendations of NACE International sour
service standards.
The manufacturing processes and materials used
by Emerson assure that all products specied
for sour gas service comply with the chemical,
physical, and metallurgical requirements of
NACE MR0175 and/or NACE MR0103. Customers
have the responsibility to specify correct materials.
Environmental limitations may apply and shall be
determined by the user.
Table 2 gives relief capacities at selected set
pressures for the Type 630R relief valve. Flows
are in SCFH (60°F and 14.7 psia) and Nm³/h (0°C
and 1.01325 bar) of 0.6 specic gravity natural gas.
To determine equivalent capacities for air, propane,
butane, or nitrogen, multiply the Table 2 capacity
by the following appropriate conversion factor:
0.775 for air, 0.625 for propane, 0.547 for butane,
or 0.789 for nitrogen. For gases of other specic
gravities, multiply the given capacity by 0.775,
and divide by the square root of the appropriate
specic gravity.
1. To determine capacities at set pressures or
build-ups not given in Table 2, use one of
the following formulas, and convert according to
the factors in the preceding paragraph
if necessary:
Q = (P
1
+ build-up)
abs
C
g
520
GT
2. For pressure drops lower than critical (absolute
outlet pressure greater than one-half of absolute
inlet pressure), use the following formula:
3417
P
C
1
P
1
Q = C
g
(P
1
+ build-up)
abs
SIN Deg.
520
GT
where,
Q = ow capacity in SCFH
G = specic gravity of gas
T = abosolute temperature of gas at inlet in
°Rankine (°Rankine = °Fahrenheit + 460)
C
g
= sizing coefficient (See
Specifications section)
P
1abs
= absolute inlet pressure in psig
(P
1
gauge + 14.7)
C
1
= C
g
/C
v
(See Specications section)
P = pressure drop across the valve in psig
Bulletin 71.4:630R
4
Table 2. Capacities in SCFH / Nm
3
/h of 0.6 Specic Gravity Natural Gas at 14.7 psia and 60°F / 1.01325 bar and 0°C
3
3
10% Build-up 20% Build-up 10% Build-up 20% Build-up
5
10
15
0.34
0.69
1.0
640
1420
2000
17.2
38.1
53.6
2710
2900
4200
72.6
77.7
113
50
75
100
3.4
5.2
6.9
2900
2700
3260
77.7
72.4
87.4
7100
7480
9670
190
200
259
20
35
50
1.4
2.4
3.4
2130
3030
4900
57.1
81.2
131
4450
7230
14,000
119
194
375
125
175
250
8.6
12.1
17.2
5500
5480
13,500
147
147
362
14,200
19,000
48,000
381
509
1286
Note: Maximum Working Pressure Above Setting is 25 psig / 1.7 bar. Note: Maximum Working Pressure Above Setting is 250 psig / 17.2 bar.
(20 pages)
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