Economizer - 15501N0020

e.

Site elevation:

[_____] meters feet

f.

Ambient air temperatures:

(1)

Minimum:

[_____] degrees C F

(2)

Maximum:

[_____] degrees C F

g.

Maximum continuous output (steam):

[_____] kg/sec lb/hr

h.

Minimum continuous output (steam):

[_____] kg/sec lb/hr (without

smoking)

i.

Continuous blowdown:

[_____] percent

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NOTE: Regarding the text below, the specified

efficiency for the boiler at maximum continuous load

shall be not less than 80 percent for coal and 82

percent for oil. If an economizer is used, use 82

and 84 percent respectively for coal and oil firing.

Depending on the particular application and fuel

used, these efficiencies could be higher.

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j.

Efficiency at maximum continuous rating [includes economizer]

(1)

Coal:

[_____] percent

(2)

[Oil]:

[_____] percent

1.4.1.2

Economizer

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NOTE: Economizers shall be specified for all

boilers with operating pressure greater than 345 kPa

(gage) 50 psig and a capacity of 2 1/4 kg/sec 18,000

pounds per hour and larger. For boilers from 1/2 to

2/14 kg/sec 4,000 to 18,000 pounds per hour the

designer shall make the decision based upon a

specific economic analysis. This paragraph shall be

included as applicable.

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NOTE: Unless a coal or a fuel oil to be burned has

an uncommon tendency to foul tubes, finned tube

economizers should be suitable for both fuels.

Feedwater temperatures should be 110 degrees C 230

degrees F when sulphur (S) content of oil is 0.5

percent; 116 degrees C 240 degrees F, S=1.5 percent

- 2 percent; 121 degrees C 250 degrees F, S=2.0

percent - 2.7 percent. Where fuels having more than

1.5 percent sulfur content are to be fired, finned

tubes shall not be used unless they are steel tubes

covered with cast iron finned casing.

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a.

Design pressure:

[_____] kPa (gage) psig

SECTION 15501N

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