Emerson Fisher 161AY Series Instruction Manual page 13

Gas Temperature
(for lower temperatures
contact your local Sales Office)
General Applications
Heavy Particle Erosion
Natural Gas With:
Up to 3% aromatic
hydrocarbon content
(3)
3 to 15% aromatic
hydrocarbon content
(3)
15 to 50% aromatic
hydrocarbon content
(3)
Up to 3% H S (hydrogen
2
sulfide or sour gas)
Up to 3% ketone
Up to 10% alcohol
Up to 3% synthetic lube
1. The NPS 6 / DN 150, 17E97 diaphragm will perform in gas temperatures as low as -20°F / -29°C.
2. For differential pressures above 400 psig / 27.6 bar diaphragm temperature is limited to 150°F / 66°C.
3. The aromatic hydrocarbon content is based on percent volume.
Construction Outlet (Control) Pressure Range
6 to 15 in. w.c.
0.5 to 1.2 psig
Type 161AY or
1.2 to 2.5 psig
161AYM
2.5 to 4.5 psig
4.5 to 7 psig
5 to 15 psig
10 to 40 psig
30 to 75 psig
Type 161EBM
70 to 140 psig
130 to 200 psig
200 to 350 psig
250 to 450 psig
Type 161EBHM
400 to 700 psig
1. Monitor pilot minimum setpoint was determined with a pressure drop ranging from 50 to 150 psig / 3.5 to 10.3 bar. Approximately double the minimum monitor pilot setpoint.
The "8" position has the largest flow, is most stable and
easiest for startup, however, using the "8" position
is not necessary. The "0" setting has the smallest
(minimum) flow passage; at no point of rotation will the
Type 112 restrictor be completely shut off. After initial
adjustment, the restrictor does not need to be adjusted
for maintenance or startup.
Low Flow Application Considerations
For stable, low flow operation, other considerations
besides pilot settings should also be addressed.
Installation of an oversized regulator may make low flow
operation difficult. When possible, a smaller-sized
Type EZR should be installed. Reduced capacity trim
reduces relief valve requirements by decreasing the
Table 8. Diaphragm Material Selection Information
17E68
NITRILE (NBR)
-20 to 150°F / -29 to 66°C
Best for cold temperatures.
Fair
Good
Poor
Not recommended
Good
Fair
Good
Fair
Table 9. Type EZR Working Monitor Performance
MONITORING PILOT
15 to 37 mbar
34 to 83 mbar
83 mbar to 0.17 bar
0.17 to 0.31 bar
0.31 to 0.48 bar
0.34 to 1.0 bar
0.69 to 2.8 bar
2.1 to 5.2 bar
4.8 to 9.7 bar
9.0 to 13.8 bar
13.8 to 24.1 bar
17.2 to 31.0 bar
27.6 to 48.3 bar
17E97
(1)
NITRILE (NBR)
0 to 150°F / -18 to 66°C
Best for high pressure conditions, i.e.
transmission service or high pressure
industrial service. It is also the best for
abrasive or erosive service applications.
Excellent
Excellent
Good
Poor
Good
Fair
Good
Fair
MINIMUM PRESSURE OVER NORMAL DISTRIBUTION
PRESSURE AT WHICH MONITOR PILOT CAN BE SET
Spring Part Number
1B653927022
1B537027052
1B537127022
1B537227022
1B537327052
17B1260X012
17B1262X012
17B1259X012
17B1261X012
17B1263X012
17B1264X012
17B1263X012
17B1264X012
maximum possible flow through the regulator but does
not improve low flow performance. During design of a
regulator installation, the downstream piping volume
should be maximized. Control lines should not be located
in or near piping sections that may experience turbulent
flow, such as elbows or swages. Larger diameter control
lines are also recommended in low flow conditions. The
larger control lines are less restrictive and will reduce pilot
exhaust bleed backpressure to the pilot that may cause
instability. Separate sense and exhaust lines may also
help at low flow conditions. This feature is provided on
the PRX Series, Types 161EBM, 161EBHM and 161AYM
pilots. Control line taps should be located in straight pipe;
several pipeline diameters (8 to 10 of largest piping on
outlet) downstream of the regulator. These guidelines
have been used to improve station stability at low flow.
Type EZR
17E88
FLUOROCARBON (FKM)
0 to 260°F / -18 to 127°C
Best for natural gas having aromatic
hydrocarbons. It is also the best for high
temperature applications.
Good
Excellent
Good
Fair
Good
WITH A RESTRICTOR SETTING OF 2
1 in. w.c. 2 mbar
1 in. w.c. 2 mbar
0.5 psig 34 mbar
0.5 psig 34 mbar
0.5 psig 34 mbar
0.5 psig 34 mbar
0.5 psig 34 mbar
0.6 psig 41 mbar
1.3 psig 90 mbar
1.5 psig 0.10 bar
3 psig 0.21 bar
3.5 psig 0.24 bar
7 psig 0.48 bar
(2)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
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