71
Table 22 – Orifice Size and Manifold Pressure (in. W.C.) for Gas Input Rate
S
A
G
L
A
R
U
T
A
N
F
O
Y
T
I
V
A
R
G
C
I
F
I
C
E
P
S
S
A
G
.
G
V
A
HEAT VALUE
0.58
0.60
0.62
0.64
AT ALT
I
TU
D
E
Orifice
Manifold
Orifice
Manifold
Orifice
Manifold
Orifice
Manifold
(
B
tu
/
cu ft)
No.
Pressure
No.
Pressure
No.
Pressure
No.
Pressure
9
00
43
3.8
42
3.2
42
3.3
42
3.4
0
9
25
43
3.6
43
3.7
43
3.8
42
3.2
(
0
)
9
50
43
3.4
43
3.5
43
3.6
43
3.7
9
75
44
3.7
44
3.8
43
3.4
43
3.6
to
1000
44
3.5
44
3.6
44
3.8
43
3.4
1025
44
3.3
44
3.5
44
3.6
44
3.7
2000
1050
44
3.2
44
3.3
44
3.4
44
3.5
(
610
)
1075
45
3.7
45
3.8
44
3.3
44
3.4
1100
46
3.7
46
3.8
45
3.8
44
3.2
U
.S.
A
.
800
42
3.4
42
3.5
42
3.6
42
3.7
2001
(
611
)
825
43
3.8
42
3.3
42
3.4
42
3.5
to
850
43
3.6
43
3.7
42
3.2
42
3.3
3000
(9
14
)
875
43
3.4
43
3.5
43
3.7
43
3.8
9
00
44
3.7
44
3.8
43
3.5
43
3.6
Canada
9
25
44
3.5
44
3.6
44
3.8
43
3.4
2001
(
611
)
9
50
44
3.3
44
3.4
44
3.6
44
3.7
to
9
75
44
3.2
44
3.3
44
3.4
44
3.5
4500
(
1372
)
1000
44
3.0
44
3.1
44
3.2
44
3.3
775
42
3.3
42
3.4
42
3.5
42
3.6
3001
800
43
3.8
42
3.2
42
3.3
42
3.4
(9
15
)
825
43
3.6
43
3.7
43
3.8
42
3.2
850
44
3.8
43
3.5
43
3.6
43
3.7
875
44
3.6
44
3.7
43
3.4
43
3.5
4000
9
00
44
3.4
44
3.5
44
3.7
44
3.8
(
121
9)
9
25
44
3.2
44
3.4
44
3.5
44
3.6
9
50
44
3.1
44
3.2
44
3.3
44
3.4
750
42
3.3
42
3.4
42
3.5
42
3.6
4001
775
43
3.7
43
3.8
42
3.3
42
3.4
(
1220
)
800
43
3.5
43
3.6
43
3.7
43
3.8
825
44
3.8
43
3.4
43
3.5
43
3.6
850
44
3.5
44
3.7
44
3.8
43
3.4
5000
875
44
3.3
44
3.5
44
3.6
44
3.7
(
1524
)
9
00
44
3.2
44
3.3
44
3.4
44
3.5
9
25
44
3.0
44
3.1
44
3.2
44
3.3
725
42
3.2
42
3.3
42
3.4
42
3.5
5001
750
43
3.7
43
3.8
42
3.2
42
3.3
(
1525
)
775
43
3.4
43
3.5
43
3.7
43
3.8
800
44
3.7
44
3.8
43
3.4
43
3.5
825
44
3.5
44
3.6
44
3.7
44
3.8
6000
850
44
3.3
44
3.4
44
3.5
44
3.6
(
182
9)
875
44
3.1
44
3.2
44
3.3
44
3.4
9
00
44
2.
9
44
3.0
44
3.1
44
3.2
675
42
3.4
42
3.5
42
3.6
42
3.8
6001
700
42
3.2
42
3.3
42
3.4
42
3.5
(
1830
)
725
43
3.6
43
3.7
43
3.8
42
3.3
750
43
3.4
43
3.5
43
3.6
43
3.7
775
44
3.6
44
3.7
43
3.4
43
3.5
7000
800
44
3.4
44
3.5
44
3.6
44
3.7
(
2133
)
825
44
3.2
44
3.3
44
3.4
44
3.5
850
44
3.0
44
3.1
44
3.2
44
3.3
to
to
to
to
ALT
I
TU
D
E
RANGE
ft (
m
)
U
.S.
A
.
an
d
C
an
ad
a
SI
NGLE-
S
TAGE FURNACE
(TA
B
ULATE
D D
ATA
B
A
S
E
D
ON
20,000 B
TUH
P
ER
B
URNER
, D
ERATE
D 2
%
/1000
FT (
305
M) A
B
OVE
S
EA LEVEL)
U
.S.
A
.
On
ly
U
.S
.
A
.
O
n
ly
U
.S
.
A
.
O
n
lyU
.S.
A
.
On
ly
U
.S.
A
.
an
d
C
an
ad
a
A11253A
PG92S*S