d.
Temperature differential between boiler discharge and system
return [_____] degrees C degrees F.
e.
Water pressure drop [70] [_____] kPa [10] [_____] psig.
f.
Outdoor ambient air temperature [_____] degrees C degrees F (max),
[_____] degrees C degrees F (min).
g.
Site elevation [_____] m feet.
h.
Maximum continuous capacity [_____] kW Btuh.
i.
Rated capacity [_____] kW Btuh.
j.
Maximum exhaust stack temperature [_____] degrees C degrees F.
k.
[Boilers with a capacity less than 90 kW 300,000 Btuh shall have
an Annual Fuel Utilization Efficiency of at least 80 percent.]
[Gas fired boilers with a capacity of greater than or equal to 90
kW 300,000 Btuh shall have a thermal efficiency of at least 80
percent when fired at the maximum and minimum ratings allowed by
the controls.] [Oil fired boilers with a capacity of greater than
or equal to 90 kW 300,000 Btuh shall have a thermal efficiency of
at least 83 percent when fired at the maximum and minimum ratings
allowed by the controls.] [Condensing boilers shall have an Annual
Fuel Utilization Efficiency of at least 90 percent].
2.1.7
Steam Heating Boilers
**************************************************************************
NOTE: Steam boilers will operate at pressures below
100 kPa (15 psi). In case of installation of a
small boiler where the omission of the water column
is standard in some manufacturers, the water column
requirement and other inapplicable words will be
deleted. However, if the water column requirement
is deleted from the specification, a visible water
column shall be included in the external piping
arrangement to the boiler. The boiler feed water
piping shall contain a loop or trap. The bottom
portion of the trap shall be below the anticipated
water level within the boiler. All piping
arrangements will be shown on the drawings. Delete
those subparagraphs which are not applicable to the
design. Indicate the elevation of the project site
and the outdoor ambient air temperature range
expected at the project site. Site conditions
affect fan selection, boiler design, and stack
design. The feed water temperature shall be
selected to avoid thermal shock. Typical ranges are
between 10 degrees C (20 degrees F) and 20 degrees C
(40 degrees F) below the boiler outlet temperature.
The boiler manufacturer should be consulted for
proper selection. Select appropriate boiler types.
Allow adequate space around each boiler to permit
accessibility for operation, maintenance, and
service (including space for tube removal). A
minimum of 1200 mm (4 feet) around the boiler will
SECTION 15569A
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