High Altitude Deration Chart - York International DGAA Installation Instruction

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HIGH ALTITUDE DERATION CHART

56,000 — Input
Elevation
Orifice
Drill
Dia.
Size
Sea Level
0.136
29
2,000
0.136
29
3,000
0.128
30
4,000
0.128
30
5,000
0.128
30
6,000
0.128
30
7,000
0.120
31
8,000
0.120
31
9,000
0.120
31
10,000
0.116
32
56,000 — Input
Elevation
Orifice
Drill
Dia.
Size
Sea Level
0.082
45
2,000
0.081
46
3,000
0.078
47
4,000
0.078
47
5,000
0.078
47
6,000
0.076
48
7,000
0.076
48
8,000
0.073
49
9,000
0.073
49
10,000
0.070
50
Table shows 4% Input Reduction per 1,000 feet Elevation.
Reference Source: NFPA No. 54, ANSI Z 223.1, National
Fuel Gas Code.
Unitary Products Group
70,000 — Input
Orifice
Drill
Part #
Dia.
Size
9951--1361
0.154
23
9951--1361
0.149
25
9951--1281
0.149
25
9951--1281
0.147
26
9951--1281
0.144
27
9951--1281
0.144
27
9951--1201
0.140
28
9951--1201
0.136
29
9951--1201
0.136
29
9951--1161
0.128
30
70,000 — Input
Orifice
Drill
Part #
Dia.
Size
9951--0821
0.093
42
9951--0811
0.093
42
9951--0781
0.089
43
9951--0781
0.089
43
9951--0781
0.089
43
9951--0761
0.086
44
9951--0761
0.086
44
9951--0731
0.082
45
9951--0731
0.081
46
9951--0731
0.078
47
NATURAL GAS
77,000 — Input
Orifice
Drill
Part #
Dia
Size
9951--1541
0.161
20
9951--1491
0.157
22
9951--1491
0.157
22
9951--1471
0.154
23
9951--1441
0.152
24
9951--1441
0.149
25
9951--1401
0.147
26
9951--1361
0.144
27
9951--1361
0.140
28
9951--1281
0.136
29
PROPANE GAS
77,000 — Input
Orifice
Drill
Part #
Dia.
Size
9951--0931
0.098
40
9951--0931
0.096
41
9951--0891
0.093
42
9951--0891
0.093
42
9951--0891
0.093
42
9951--0861
0.089
43
9951--0861
0.089
43
9951--0821
0.086
44
9951--0811
0.086
44
9951--0781
0.082
45
For Canadian high altitude (2000 - 4500 feet), reduce gas
manifold pressure to 3.0" W.C. for natural gas, 9.0"
W.C. for Propane gas.
035-16328-002 Rev. C (0902)
90,000 — Input
Orifice
Drill
Part #
Dia.
Size
9951--1611
0.180
15
9951--1571
0.177
16
9951--1571
0.173
17
9951--1541
0.173
17
9951--1521
0.169
18
9951--1491
0.166
19
9951--1471
0.161
20
9951--1441
0.161
20
9951--1401
0.157
22
9951--1361
0.152
24
90,000 — Input
Orifice
Drill
Part #
Dia.
Size
9951--0981
0.106
36
9951--0961
0.104
37
9951--0931
0.101
38
9951--0931
0.101
38
9951--0931
0.099
39
9951--0891
0.098
40
9951--0891
0.096
41
9951--0861
0.096
41
9951--0861
0.093
42
9951--0821
0.089
43
Part #
9951--1801
9951--1771
9951--1731
9951--1731
9951--1691
9951--1661
9951--1611
9951--1611
9951--1571
9951--1521
Part #
9951--1061
9951--1041
9951--1011
9951--1011
9951--0991
9951--0981
9951--0961
9951--0961
9951--0931
9951--0891
21

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