05-06M
Equipment. If state or local codes are more stringent than the above
requirements, discuss with the VA Contracting Officer.
2.7 Show boiler plant work on drawings using a minimum scale of 1:50 (1/4" =
1'0").
2.8 All floor-mounted equipment shall be placed on and anchored to
housekeeping pads.
2.9 Existing work which remains in service shall be identified in a way which
easily distinguishes this work from the new work. Points of connection
between new and existing work shall be identified.
3. EQUIPMENT LISTS AND SCHEDULES:
3.1 All boiler plant equipment shall be listed and scheduled in conformance
with VA National CAD Standard Details 15051-4, 5, 6, 7; 15339-1, 4; 15622-1;
15624-3; 15625-1, 4, 5; 15901-3.
4. BOILER PLANT CAPACITY AND PRESSURE:
4.1 The following establishes VA policy on the quantity, capacity,
arrangement, and standby capability of the boilers and auxiliary equipment. It
applies to the design of new boiler plants, replacement boiler plants, and
expansion of existing boiler plants, in all climates.
4.2 Maximum steam loads shall be determined by adding existing steam demands
and new connected loads with diversity factors, and allowing credit for heat
recovery devices. Include future loads for projects that are programmed.
Boiler plant auxiliary equipment loads and distribution line losses shall be
included in load calculations. Existing loads should be determined by
reviewing boiler steam flow data for winter periods when the outside
temperature approaches ASHRAE design conditions, and for summer periods. The
accuracy of the data must be verified. In the review of the data, judgment
must be utilized in determining realistic peak loads (loads which are
sustained for at least ten minutes).
4.3 The plant shall be capable of supplying the maximum steam demand with the
largest boiler not operating, and with the largest pump of each service not
operating.
4.4 The plant shall be capable of supplying the minimum steam demand with the
smallest boiler in a normal mode of operation and with all auxiliary equipment
operating within recommended turn-down ranges. The capacity of the smallest
boiler shall be sufficient for peak demand in the non-heating season.
4.5 A minimum of three boilers is required for plants which serve medical
centers.
requirements as follows:
4.6.1 Fire Tube Packaged Gas and/or Oil Boilers: Provide 0.047 square meter
per kilowatt output (5 square feet per boiler horsepower).
4.6.2 Water Tube D- Type Packaged Gas and/or Oil Boilers:
Heating Surface (sq. meters) = (Output (Kg/Sec) x 60.6) + 60
Heating Surface (sq. ft.) = Output (BTU/Hr.) + 700
12,500
Heating
surface is defined as the flat projected area in the
furnace
and full circumferential area in the convection
section
of the boiler. Furnace heat release shall not exceed
520,000
W/cu. meter (50,000 BTU/Hr. cu. ft).
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