Bulletin 74.1:T205
6
Table 6. Correction Factors (For converting Air Flow Rates to Other Gas Flow Rates)
(1)
Installation
The regulator may be installed in any position as long as
the ow through the body is in the direction indicated by
the arrow on the body when using a Type T205 or T205M
regulator. To achieve the published capacities at low
setpoint, the spring case barrel should be installed pointed
down as shown in Figures 2 and 3. For complete actuator
drainage, the regulator should be installed as shown in
Figure 4.
The diaphragm casing may be rotated in order to obtain
desired positioning. The Type T205M requires a downstream
control line. The control line should be installed sloping
downward toward the tank to prevent condensation buildup
and avoid low points (or traps) that could catch liquid. The
sensing line must enter the tank above the liquid level at a
point that senses the vapor space pressure and is free from
turbulence associated with tank nozzles or vents.
Overpressure Protection
The T205 Series regulators have an outlet pressure rating
lower than their inlet pressure rating. If actual inlet pressure
can exceed the outlet pressure rating, outlet overpressure
protection is necessary.
Refer to the Capacity Information section and the relief
sizing coefcients in Table 5 to determine the required relief
valve capacity.
Universal NACE Compliance
Optional materials are available for applications handling
sour gases. These constructions comply with the
recommendations of National Association of Corrosion
Engineers (NACE) sour service standards.
The manufacturing processes and materials used by
Emerson Process Management Regulator Technologies, Inc.
assure that all products specied for sour gas service comply
with the chemical, physical and metallurgical requirements
of NACE MR0175-2002. Customers have the responsibility
to specify correct materials. Environmental limitations may
apply and shall be determined by the user.
Capacity Information
Capacity tables are based on 1.0 specic gravity air. If other
blanketing gas is used, convert the tabular values as follows.
For blanketing (pad) gases other than air, multiply the given
air ow rate by the correction factors in Table 6. For gases of
other specic gravities, divide the given air ow rate by the
square root of the appropriate specic gravity.
Q = C
g
P
1
SI DEG
520
GT
3417
C
1
ΔP
P
1
where,
Q = gas ow rate, SCFH
G = specic gravity of the gas
T = absolute temperature of gas
at inlet, °Rankine
C
g
= gas sizing coefcient
P
1
= absolute inlet pressure, psia
C
1
= C
g
/C
v
, ow coefcient
ΔP = pressure drop across the regulator, psi
BLANKET GAS SPECIFIC GRAVITY CORRECTION FACTOR
Natural Gas 0.60 1.291
Nitrogen 0.97 1.015
Dry CO
2
1.52 0.811
1. For gases of other specic gravities, use equation below.
Correction Factor =
1.00
SG
Table 5. Flow Coefcients
TYPE
ORIFICE SIZE FLOW COEFFICIENTS (WIDE-OPEN)
C
1
In. mm C
g
C
v
T205 and T205M
1/8 3.2 12 0.36 33.3
1/4 6.4 47 1.40 33.1
3/8 9.5 101 2.96 34.1
1/2 13 174 5.20 33.4
9/16 14 205 6.20 33.1
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