Determining The Total
Square Feet of Heating Surface

Step 1
Determine The Following Variables:
Steam Supply Pressure: _______________  psi
Recovery Rating: _____________________ GPH
Incoming Cold Water: _________________ ^o F
Desired Hot Water: ___________________ ^oF
Steam Consumption:______________  Lbs./Hr.

Step 2
Determine if the storage tank is to include a built-in Intra-Tank circulator, or if it is to rely on natural convection for circulation within the tank. 

Note: If the Recovery Rating is greater than three times the storage capacity of the vessel, then the heating coil may be wrapped and baffled to allow for an integral pump to force circulate water over the heating coil. The pump must be sized for the maximum GPM recovery rating.

Step 3
Use Chart #1 to determine the conversion factor of GPH heated per square foot of heating coil at the given steam supply pressure, temperature rise, and method of tank circulation.

Step 4
Solve for the required square footage of heating surface by dividing the total GPH recovery by the conversion factor solved for in Chart #1 on the following page.

Selecting The Steam Coil

Step 5
Determine the length of the heating coil.
Note: A coil in a vertical tank should be as close to but not exceeding the diameter of the vessel as possible.
A coil in a horizontal tank is typically approximately 2/ 3 the length of the vessel
______  " Approximate Coil Length desired

Step 6
From Chart #2 (see following page) starting with the smallest diameter coil, continue down the Coil Total Sq. Ft. column until the desired Sq. Ft. as determined in Step 4 is within the range. Then multiply the desired Sq. Ft. of heating surface by the length multiplier. This will yield the total length of the coil. If the resulting length is longer than the required length as determined in Step 5, then continue to the next coil range until a suitable length can be selected.

Step 7
Formulate the coil model number by using the model number configurator on the back page.

Temperature

Steam Pressure (psi) nIn line / In Coil

2/0

5/2

10/5

15/10

25/15

35/20

50/30

65/40

75/50

125/75

150/100

175/125

40-120^oF

52.9

57.3

58.9

62.7

67.9

70.8

77.5

81.4

85.7

94.8

102.1

105.6

30.7

33.2

35.7

39.4

43.2

47

51.9

57

60.8

69.6

75.8

82.1

40-140^oF

40

43.8

46.3

50

53.1

57.5

63.1

66.9

71.3

79.4

83.8

90

22

24

26

29

32

35

39

43

46

53

58

63

40-160^oF

31.2

33.5

36

39.7

42.7

45

50.4

53.6

56.9

63.9

67.3

72.4

15.9

17.6

19.3

21.9

24.4

26.8

30.2

33.5

36

41.8

46

50.2

40-180^oF

21.9

23.8

26.9

31.9

33.1

35

41.3

43.1

46.9

51.9

55

61.3

11.2

12.7

14.3

16.6

18.7

20.8

23.7

26.6

28.8

33.7

37.3

40.8

50-120^oF

59

62.4

66.7

73.5

77.4

81.9

89.9

98.1

103

112

121.1

127.9

33.9

36.8

39.6

43.7

48

52.4

58

63.7

67.9

78.1

85.1

92.2

50-140^oF

43.6

46

49.4

54.1

58.2

61.2

67.4

71.4

75.4

83.7

89

94

23.6

25.8

28

31.3

34.6

37.9

42.3

46.7

50

57.7

63.2

68.8

50-160^oF

32.6

34.8

37.9

42.3

45.7

48.6

53.8

57.3

60.9

67.7

72.4

77.3

16.7

18.5

20.4

23.1

25.8

28.5

32.1

35.7

38.4

44.7

49.2

53.8

50-180^oF

23.1

26.3

28.1

33.1

36.3

38.1

43.1

46.9

50

55

58.8

66.9

11.6

13.2

14.8

17.3

19.5

21.8

24.9

27.9

30.2

35.6

39.4

43.2

60-120^oF

67.6

70.8

75.7

79.4

85.7

93.2

98.9

104.8

112.2

119.9

130.9

139.1

38.1

41.5

44.7

49.6

54.5

69.5

66.1

72.8

77.7

89.2

97.5

105.9

60-140^oF

48.3

51.9

54.8

59.3

63.9

67.9

75.7

80.2

83.5

94.3

98.9

104.1

25.5

27.9

30.4

34.4

37.8

41.4

46.4

51.3

55

63.6

69.8

76

60-160^oF

35.3

37.6

40.9

45.6

48.9

51.9

59.1

61.5

66.2

74

79.4

84.4

17.6

19.6

21.6

24.6

27.5

30.4

34.4

38.3

41.3

48.1

53.1

58

60-180^oF

23.8

28.1

30

35

36.9

41.3

46.3

48.1

53.1

58.1

65

68.8

12

13.7

15.4

18

20.5

22.9

26.2

29.5

32

37.7

41.8

45.8

Base
Model

Head Flange Size
(150# ANSI)

Steam Inlet And
Condensate Outlet
Port Sizing
Male NPT (Inches)

Number
of
Tubes

Coil Total
Sq. Ft.
Range

Length
Multiplier

C

4

1 1/4

5

1-24

6.3

D

5

1 1/2

7

2-31

4.4

E

6

2

13

4-55

2.4

F

8

3

24

11-105

1.3

G

10

4

41

17-186

0.76

H

12

4

59

34-266

0.53

J

14

4

92

42-364

0.39

K

16

To Spec

112

54-625

0.28

L

18

To Spec

143

76-803

0.22