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2.11 PIPE SIZING CRITERIA
A. Pipe sizing shall be based on "Cameron Hydraulic Data";
with C=100
for open systems (Example:
Cooling Tower) and C=150 for closed
systems (Example:
Chilled and Hot Water Systems).
B. For closed systems, the limiting maximum pressure drop shall be 1200
mm (4.0 feet) of water per 30 m (100 feet) equivalent length of
piping.
The corresponding velocity limitations are:
1200 mm (4.0 Feet) Per Second:
Occupied Areas
2400 mm (8.0 Feet) Per Second:
Mains and Large Branches
C. For open systems, the limiting maximum pressure drop shall be 1200 mm
(4.0 feet) of water per 30 m (100 feet) equivalent length of piping.
The corresponding velocity shall be 3 m (10 feet) per second
(maximum).
D. The minimum pipe shall be 20 mm (3/4").
The size shall be reduced,
as required, only at the equipment connections.
2.12 SELECTION GUIDE FOR VIBRATION ISOLATORS
See Supplement, Attachment No. 5.
2.13 CLIMATIC CONDITIONS
See Supplement, Attachment No. 6.
3. HVAC SYSTEMS
3.1 GENERAL
The selection of the HVAC systems shall be based on the life cycle
cost analysis, except the animal research areas for which either a
single or multiple all air, air handling units shall be provided.
For larger projects the following guidelines are proposed:
AH-1:
To serve animal holding areas.
AH-2:
To serve animal procedure and operating rooms.
AH-3:
To serve animal research laboratories.
For non-research support areas, a dedicated all air system, or a
terminal cooling/heating system, shall be considered for detailed
evaluation
only if:
In this section, the design criteria for an all air system, with or
without perimeter heating, and terminal cooling/heating systems are
given.
3.2 ALL AIR SYSTEMS
A. SYSTEM FEATURES: The features listed below shall be incorporated in
design unless specific deviations recommended by a designer are
deemed beneficial for this project.
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