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Bosch 330-PN-N Installation Manual page 17

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GAS LINE SIZING
The gas supply piping should be sized according to the
applicable code for a maximum draw of 74,900 BTUH.
Measure the length of gas supply line and use the tables in
page 17 or the gas line manufacturer's sizing tables to
determine the pipe diameter necessary to accommodate the
BTU demand of the unit. If there are more gas appliances
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour for
Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in
Water Column (0.75mbar).(Based on a 0.60 Specific Gravity
Gas) Btu numbers given in thousands. Copper tubing is
prohibited for use with Natural Gas in the Commonwealth of
Massachusetts and not recommended elsewhere.
Nominal
Iron
Pipe
Internal
Size
Diameter
Inches
inches
3/4
0.824
1
1.049
1 - 1/4
1.380
Table 7
Tube
size,
Inches
1/2
3/4
1
1 - 1/4
Table 8
* EHD = Equivalent Hydraulic Diameter. The greater the value
EHD, the greater the gas capacity of the tubing.
FOR LP GAS
Maximum Capatity of Pipe in Thousands of BTU per Hour of
Undiluted Petroleum Gases (at 11 inches Water Column Inlet
330 PN
10
20
30
40
278
190
152
130
520
350
285
245
1050 730
590
500
Lenght of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
EHD*
10
18
82
23
161
30
330
37
639
drawing on the same line, size the gas line according to the total
maximum amount of BTU draw for all appliances.
Note: Under sizing the gas line may result in diminished output
and improper operation. See chapter 4.8 for the procedure to
confirm gas pressure.
Follow boxed numbers for piping just one 330 PN (example: ¾"
B.I. Natural Gas pipe for 20 ft (6.1m). will handle 190,000
btu's (55.7 kWh). For multiple appliances combine the total
btu input load and then refer to applicable chart below.
Lenght of Black Iron Pipe, Feet
50
60
70
80
115
105
96
90
215
195
180
170
440
400
370
350
20
30
58
47
116
96
231
188
456
374
Pressure) (Based on a Pressure Drop of 0.5 Inch Water
Column).
Installation instructions | 17
90
100
125
150
84
79
72
64
160
150
130
120
320
305
275
250
40
50
41
37
83
75
162
144
325
292
6 720 644 951 (2014/11)
175
200
59
55
110
100
225
210
60
34
68
131
267

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