Installation instructions

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.

Follow boxed numbers for piping just one GWH 425 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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nominal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Iron

 

 

 

 

 

Length of Black Iron Pipe, Feet

 

 

 

 

 

 

Pipe

Internal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Size

Diameter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

inches

inches

10

20

30

40

50

60

70

80

90

100

125

150

175

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet

Tube

 

 

 

 

 

 

 

size,

 

 

 

 

 

 

 

inches

EHD*

 

 

 

 

 

 

10

20

30

40

50

60

 

 

 

 

 

 

 

1/2

18 EHD 82

58

47

41

37

34

 

 

 

 

 

 

 

 

3/4

23 EHD

161

116

96

83

75

68

1

30 EHD 330

231

188

162

144

131

1 1/4

37 EHD 639

456

374

325

292

267

*EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.

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 Water Column).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N o minal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Iro n pipe

 

 

 

 

Black Iron Pipe

 

 

 

 

 

 

size

 

 

 

 

Lenght of pipe, Feet

 

 

 

 

 

 

inches

10

20

30

40

50

60

80

100

125

150

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1/2

 

291

200

160

137

122

110

94

84

74

67

58

 

 

 

 

3/4

 

608

418

336

287

255

231

197

175

155

140

120

 

 

 

 

1

 

1145

787

632

541

480

434

372

330

292

265

227

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.

Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet

Tube

 

 

 

 

 

 

 

size

 

 

 

 

 

 

 

inches

EHD*

 

 

 

 

 

 

10

20

30

40

50

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1/2

18 EHD

129

91

74

64

58

53

3/4

23 EHD 254

183

151

131

118

107

1

30 EHD 521

365

297

256

227

207

1 1/4

37 EHD 971

661

528

449

397

359

 

 

 

 

 

 

 

 

Maximum Capacity of Semi-Rigid copper Tubing in Thousands of BTU per Hour of Undiluted Liquefied 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

 

 

 

 

 

Copper (LP gas only)

 

 

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

 

 

 

 

 

 

 

 

 

 

 

Fig. 14

12

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Page 12
Image 12
Bosch Appliances Model GWH 425 manual For Natural GAS