Transition

Furnaces for D-type boilers shall be on the [_____] hand side of the drums

when viewed from the front of the boiler.

2.2.4

Transition

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NOTE: This paragraph should be used when a

breeching transition piece is desired to be provided

with the boiler.

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Provide a transition piece to permit adapting the [boiler] [economizer]

outlet to the [stack] [breeching]. Design transition pieces for [vertical]

[horizontal] discharge.

2.2.5

Combustion Controls

As specified in VAMS Section 15901N CONTROLS AND INSTRUMENTATIONS BOILER

PLANT.

2.2.6

Access and Observation Doors

Provide boiler with sufficient number of access doors and observation

doors, to give free and easy access and observation to all parts of the

interior of the boiler.

2.3

ECONOMIZERS

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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 per second

18,000 pounds per hour and larger. For boilers from

1/2 to 2 1/4 kg per second 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 fuel oil to be burned has an uncommon

tendency to foul tubes, finned tube economizers

should be suitable for gas and oil. Feedwater

temperatures should be 110 degrees C 230 degrees F

when sulphur (S) content of oil is 0.5 percent to

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

percent to 2 percent; 121 degrees C 250 degrees F,

S=2.0 percent to 2.7 percent.

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Provide a modular unit constructed in accordance with the ASME Boiler and

Pressure Vessel Code, Section 1, of one of the following types:

a.

Internal Tubular Type: Boiler feedwater flows through the outer

shell and flue gases circulate up through internal tubes provided

with removable flue gas spinners.

b.

Finned or Spiral Wound Tube Type: Feedwater circulates through

finned tubes and flue gas flows through outer shell.

SECTION 15511N

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