Title: Grill Parts: Natural Gas Conversion | BBQ Repair Tips & Tricks for Weber, CharBroil, Ducane, DCS Grills and More | grillparts.com
Headings: Propane/Natural Gas Conversion
Propane/Natural Gas Conversion
Fundamentals
Certification and Design
Propane or L/P Gas Supply
Natural Gas or N/G Gas Supply
BTU Ratings
Typical Grill Nameplate
Orifice Size
Click Here to See Our BTU and Orifice Size Guide
Control Valves
The Meat of it All
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Content: As an example, assuming a fixed natural gas pressure of 3.5 inches of water column a #48 orifice will give a different BTU output than a #46. ( Altitude also affects the BTU rating.) Click Here to See Our BTU and Orifice Size Guide
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. Control Valves
Control valves regulate the volume of gas supplied to the burner. Valves have specific maximum BTU ratings and are ported internally to specific sizes. This means that if you are attempting to convert from propane to natural gas, the volume of gas supplied to the burner may not produce a sufficient amount of heat at a HIGH setting even with a correct orifice size.