Flow Chart - GPM - SCH. 40 PIPE

PIPE SIZE I.D.

GRAVITY

COMM. 3 FPS

MAX. FLOW RATE GRAVITY TO COLLECTOR TANK INSTALLATIONS

SUCTION

COMM. 6 FPS

MAX. FLOW RATE FOR SUCTION LINES IN COMMERCIAL POOLS

SUCTION

RES. 8 FPS

MAX. FLOW RATE FOR SUCTION LINES IN RESIDENTIAL POOLS

PRESSURE

10 FPS

MAX. FLOW RATE FOR RETURN LINES IN SWIMMING POOLS

GAL. PER LINEAL FT.

CAPACITY IN GALLONS IN 1 ft. OF PVC PIPE

1.0″7.7815.5420.7325.91.041
1.5″18.5837.0049.5061.85.092
2.0″26.3956.7877.20135.14.163
2.5″38.9687.80140.35170.57.255
3.0″63.11158.61226.50271.74.368
4.0″117.19234.74312.85391.01.654
6.0″267.00534.12711.90890.211.468
8.0″462.96925.931234.571543.212.61
10.0″729.481461.931948.842434.274.078
 12.0″1038.782074.692764.983458.505.872
 16.0″1229.513276.134368.935456.3510.439

Flow meter – provide min. 10 pipe diam. Before & 5 pipe diam. After flowmeter.

Pump suction – provide min. 5 pipe diam. Straight clear length before pump.

GAS LINE SIZING GAS FLOW

 Natural Gas

Maximum Capacity of Pipe In Cubic Feet of Gas per Hour- Gas PSI of .5 (14″ Water Column) or less-

Pressure Drop of .5″ Water Column (WC)

Maximum Capacity of Pipe in Thousands of Btu per Hour (Based on a 0.60 Specific Gravity Gas)

Nominal Iron Pipe                                            Length of Pipe, Feet 

Size,Inches

20

30

40

50

60

80

100

150

1/4

29

24

20

18

16

14

12

10

1/2

120

97

82

73

66

57

50

40

3/4

250

200

170

151

138

118

103

84

1

465

375

320

285

260

220

195

160

1-1/4

950

770

660

580

530

460

400

325

1-1/2

1,460

1,180

990

900

810

690

620

500

2

2,750

2,200

1,900

1,680

1,520

1,300

1,150

950

 

Propane (LPG)

Example: a 400,000 btu natural gas heater up to 100 ft. From the gas meter will require pipe 1-1/4″ diam 

Maximum Capacity of Pipe in Thousands of Btu per Hour

Pressure Drop of 0.5″ WC

Nominal Iron Pipe                                            Length of Pipe, Feet 

Size,Inches

20

30

40

50

60

80

100

150

1/2

189

152

129

114

103

89

78

63

3/4

393

315

267

237

217

185

162

132

1

732

590

504

448

409

346

307

252

1-1/4

1,496

1,212

1,039

913

834

724

630

511

1-1/2

2,299

1,858

1,559

1,417

1,275

1,086

976

787

2

4,331

3,465

2,992

2,646

2,394

2,047

1,811

1,496

Gas line sizing btu

Natural gas propane gas gas pipe heaters

Example: a 400,000 btu propane gas heater up to 100 ft. From the gas meter will require pipe 1″ diam.

Gas flow

Note: gas line piping should only be installed by licensed & experienced gas line plumbing contractors

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