4
Model 121 Regulators Brochure
An outstanding feature of the 121 is large capacity. It has so
much that at higher inlet pressure it is necessary to increase the
size of the outlet piping.
This pipe size increase is indicated by the asterisks in the
capacity tables below and on pages 4, 5, 6 and 7. The following
note explains how to read this data from the tables:
NOTe:
(DFKFDSDFLW\¿JXUHLPPHGLDWHO\DERYHWKHKHDY\
horizontal lines is a maximum capacity for the outlet pipe
size shown. Increasing the inlet pressure will not increase
the capacity without also increasing the outlet pipe size
as indicated.
1½", 2" and 2½" Model 121-12
Capacity in scfh of natural gas
6SHFL¿F*UDYLW\±SVLD±)
For example: a 1½" Model 121-12 at 5" w.c. set-point has the
following maximum capacities:
1. With 1½" size outlet piping ........................ 14,600 SCFH
at 3 psi to 60 psi inlet pressure.
2. With 2" size outlet piping ........................... 37,000 SCFH
at 15 psi to 60 psi inlet pressure.
3. With 3" size outlet piping ........................... 95,000 SCFH
at 60 psi inlet pressure.
The designated increase in outlet pipe size must be made
immediately downstream of the regulator outlet.
This
NOTe
applies to the asterisks in all capacity tables, pages
4, 5, 6 and 7.
Pipe
Size
Inlet
Pressure
Outlet Pressure
Regulator
6L]HDQG
0RGHO
Set-Point
:&
Set-Point
:&
Set-Point
:&
Set-Point
:&
Set-Point
:&
Set-Point
2 psi.
Set-Point
3 psi.
5HG6SULQJ
ZF'URRS
Blue Spring
ZF'URRS
Green Spring
ZF'URRS
Orange Spring
ZF'URRS
Orange Spring
ZF'URRS
%ODFN6SULQJ
¼ psi. Droop
&DGPLXP
½ psi. Droop
1½" *
8" w.c.
4000
3000
—
—
—
—
—
1½"
Model
121-12
14" w.c.
4900
4500
3700
—
—
—
—
1 psi
7400
7000
6500
6000
—
—
—
2 psi
11500
11000
10300
9500
10000
—
—
3 psi
14600
14500
13750
12500
13000
10000
—
2" *
5 psi
19500
19400
18500
17300
18000
16400
14000
10 psi
30000
30000
28000
27000
27500
25100
25500
15 psi
37000
37000
36200
35000
35700
34000
31500
3" *
25 psi
50000
50000
49000
47400
48000
46000
45500
40 psi
68000
68000
67100
66000
66600
64200
63500
50 psi
80000
80000
79000
77700
78000
74900
76000
60 psi
95000
95000
93500
90000
92000
87000
86500
2" *
8" w.c.
5000
4000
—
—
—
—
—
2"
Model
121-12
14" w.c.
8900
8000
6600
—
—
—
—
1 psi
13000
12500
12000
11000
—
—
—
2 psi
20500
20000
19400
17500
18000
—
—
3 psi
26300
26000
25000
23400
23800
19000
—
5 psi
35000
35000
34500
33500
34000
30000
27500
3" *
10 psi
52000
52000
51000
49600
50000
49000
46500
15 psi
68000
68000
67500
65500
66000
64700
61500
25 psi
90000
90000
89000
88000
88500
84500
87000
4" *
40 psi
125000
125000
124000
120000
.121500
118000
116500
50 psi
150000
150000
148000
145000
146500
143300
139500
60 psi
175000
175000
174000
171200
172000
170000
165500
2½" *
8" w.c.
5500
4500
—
—
—
—
—
2½"
Model
121-12
14" w.c.
9700
9000
7300
—
—
—
—
1 psi
14400
14000
13000
12000
—
—
—
2 psi
22200
22000
21000
19100
20000
—
—
3 psi
29100
29000
27900
26000
27100
21500
—
5 psi
39500
39500
38700
37000
37600
33500
27500
3" *
10 psi
5800
58000
57000
54800
55500
53000
52000
15 psi
75500
75500
74000
71900
72300
70100
66500
25 psi
100000
100000
99000
97100
98000
94000
94000
4" *
40 psi
140000
140000
138000
133500
135000
130000
129500
50 psi
166000
166000
164000
156000
158000
155000
153500
60 psi
195000
195000
193000
189700
191000
188000
179000
*See NOTE in upper part of page 4.
NOTe:
The above performance data is based on normal testing
DW)ÀRZLQJWHPSHUDWXUH&KDQJHVLQSHUIRUPDQFHFDQ
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