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| BTU and Orifice Size Guide
|
BTU Input |
Natural Gas Pressure
Inches W.C. |
L/P Gas Pressure
Inches W.C |
| 3.0" |
3.5" |
4.0" |
4.5" |
7.0" |
11" |
| 10,000 |
51 |
52 |
1/16 |
53 |
54 |
62 |
| 12,000 |
50 |
50 |
51 |
51 |
53 |
59 |
| 14,000 |
48 |
49 |
50 |
50 |
52 |
57 |
| 16,000 |
46 |
5/64 |
48 |
49 |
51 |
56 |
| 18,000 |
45 |
46 |
47 |
48 |
50 |
55 |
| 20,000 |
44 |
44 |
45 |
46 |
49 |
54 |
| 25,000 |
3\32 |
42 |
43 |
44 |
46 |
53 |
| 30,000 |
38 |
40 |
41 |
42 |
44 |
52 |
| 35,000 |
35 |
36 |
38 |
39 |
42 |
50 |
| 40,000 |
31 |
33 |
35 |
36 |
41 |
48 |
|
Drill Sizes |
| K
Factor .82 |
Calculation Based on:
Natural-1050 BTU Gas -0.65 Spec. Gr.
L/P-2500 BTU Gas - 1.55 Spec Gr.
Approximate sizes based on average data for all orifice types. |
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