ASME CSD-1.] [Oil-fired units greater than or equal to 3.66 MW 12,500,000
Btuh input shall conform to NFPA 85.]
2.2.1.3
Steam or Air Atomizer
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NOTE: Delete this paragraph if steam or air
atomization is not used.
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[Steam] [or] [air] atomizer shall be of the inside mix type utilizing
[steam] [or] [air] mixing with the oil inside the nozzle. No moving parts
shall be required within the atomizer assembly. Unit shall be capable of
completely atomizing the oil through a minimum capacity range of 4 to 1
without changing nozzles or sprayer plates and when supplied with [steam]
[or] [air] at a maximum pressure of [100] [_____] kPa [15] [_____] psig.
Capacity of unit shall be adjustable. Unit shall be furnished with a
blowout valve so that [steam] [or] [air] may be blown through the oil
passages to clear them of any accumulation. A diffuser designed to
stabilize the flame shall be mounted near the furnace end of the atomizer
in such a position that oil will not strike it.
2.2.1.4
Mechanical pressure atomizer
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NOTE: If mechanical pressure atomization is not
used delete this paragraph.
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Mechanical pressure atomizer shall operate solely by the use of oil
pressure and shall have no moving parts within the atomizer. Unit shall be
capable of completely atomizing the oil through a minimum capacity range of
4 to 1 without changing nozzles or sprayer plates and when furnished with
oil at a constant pressure of [_____]. A constant volume of oil shall be
supplied to the atomizer. Variable capacity shall be obtained by adjusting
control valve. A diffuser provided to stabilize the flame shall be mounted
near the furnace end of the atomizer, but in such a position that oil will
not strike it.
2.2.2
Draft Fans
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NOTE: If natural draft/atmospheric burners are
utilized, all draft fan paragraphs will be deleted.
Select between forced draft and induced draft fan or
a combination of both. In most applications, a
forced draft fan will be adequate. Fan bearings on
induced draft fans must have adequate means to
prevent overheating and provision for lubrication.
Choice of type of cooling will depend on
availability of water for the particular site.
Water-cooled bearings are generally used for induced
draft fans but air-cooled, sealed-type bearings are
available; however, their use must be approved by
the fan manufacturer for the application if
specified. Forced draft fans are typically air
cooled.
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SECTION 15569A
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