Gas piping, connections, For natural gas, For lp gas – AquaStar 125FX LP User Manual

Page 11: Gas line sizing

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GAS PIPING, CONNECTIONS

Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is
rated for the same gas to which it will be connected.
In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel
Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes.

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.

Follow boxed numbers for piping just one Aquastar 125FX
(example: 3/4” B.I. Natural Gas pipe for 30 ft. will handle
152,000 btu’s). For multiple appliances combine the total
btu input load and then refer to applicable chart below.

(Based on a 0.60 Specific Gravity Gas) Btu numbers given
in thousands.

FOR LP GAS

Maximum Capacity of Pipe in Thousands of
BTU per Hour of Undiluted Petroleum Gases
(at 11 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Wa-
ter Column).

Maximum Capacity of Semi-Rigid
Tubing in Thousands of BTU per Hour of
Undiluted Liquified Petroleum Gases (at 11
inches Water Column Inlet Pressure)

(Based on a Pressure Drop of 0.5 Inch Water
Column)

* Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No
Additional Allowance is necessary for an ordinary number of fittings

GAS LINE SIZING

Nominal

Iron

Le ngth of Black Ir on Pipe , Fe e t

Pipe

Internal

Size,

Diameter

inches inches

10

20

30

40

50

60

70

80

90

100

125

150

175

200

1/4

0.364

32

22

18

15

14

12

11

11

10

9

8

8

7

6

3/8

0.493

72

49

40

34

30

27

25

23

22

21

18

17

15

14

1/2

0.622

132

92

73

63

56

50

46

43

40

38

34

31

28

26

3/4

0.824

278

190

152

130

115

105

96

90

84

79

72

64

59

55

1

1.049

520

350

285

245

215

195

180

170

160

150

130

120

110

100

1 1/4

1.380

1050

730

590

500

440

400

370

350

320

305

275

250

225

210

1 1/2

1.610

1600

1100

890

760

670

610

560

530

490

460

410

380

350

320

2

2.067

3050

2100

1650

1450

1270 1150 1050

990

930

870

780

710

650

610

2 1/2

2.469

4800

3300

2700

2300

2000 1850 1700

1600

1500

1400

1250

1130

1050

980

3

3.068

8500

5900

4700

4100

3600 3250 3000

2800

2600

2500

2200

2000

1850 1700

4

4.026

17,500 12,000 9,700 8,300

7,400 6,80 6,200 5,800 5,400 5,100 4,500

4,100 3,800 3500

Nominal

Iron Pipe

Black Iron Pipe

Size,

Length of Pipe, Feet

Inches

10

20

30

40

50

60

70

80

90

100

125

150

1/2

275 189 152

129 114 103

96

89

83

78

69

63

3/4

567 693 315

267 237 217 196 185 173

162

146

132

1

107 732 590

504 448 409 378 346 322

307

275

252

1 1/4

220 149 121

103 913 834 771 724 677

630

567

511

1 1/2

330 229 185

155 141 127 118 108 102

976

866

787

2

622 433 346

299 264 239 220 204 192 1811 1606 1496

Copper

Outside

Length of Tubing, Feet

Diameter,
Inch

10

20

30

40

50

60

70

80

90

100

3/8

39

26

21

19

_

_

_

_

_

_

1/2

92

62

50

41

37

35

31

29

27

26

5/8

199 131

107

90

79

72

67

62

59

55

3/4

329 216

181

145

131

121 112 104

95

90

7/8

501 346

277

233

198

187 164 155 146 138

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