BTU Per Hour at 11" w.c. at Sea Level
Orifice or
Drill Size
Propane Butane Orifice or
Drill Size
Propane Butane
.008

.009

.010

.011

.012

80

79

78

77

76

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52
519

656

812

981

1,169

1,480

1,708

2,080

2,629

3,249

3,581

4,119

4,678

5,081

5,495

6,375

6,934

7,813

8,320

8,848

9,955

10,535

11,125

11,735

12,367

13,008

13,660

14,333

15,026

17,572

21,939

24,630

28,769

32,805
589

744

921

1,112

1,326

1,678

1,936

2,358

2,980

3,684

4,059

4,669

5,303

5,760

6,230

7,227

7,860

8,858

9,433

10,031

11,286

11,943

12,612

13,304

14,020

14,747

15,486

16,249

17,035

19,921

24,872

27,922

32,615

37,190
51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18
36,531

39,842

43,361

46,983

50,088

53,296

54,641

60,229

64,369

71,095

74,924

78,029

80,513

83,721

87,860

92,207

98,312

100,175

103,797

109,385

117,043

134,119

150,366

160,301

168,580

175,617

181,619

187,828

192,796

200,350

205,525

210,699

223,945

233,466
41,414

45,168

49,157

53,263

56,783

60,420

61,944

68,280

72,973

80,599

84,940

88,459

91,215

94,912

99,605

104,532

111454

113,566

117,672

124,007

132,689

152,046

170,466

181,728

191,114

199,092

205,896

212,935

218,567

227,131

323,997

238,863

253,880

264,673

Courtesy of National Fire Protective Association -NFPA No. 54 National Fuel Gas Code - 1988