(a) All chilled water supply piping shall be insulated.
(b) Chilled water return piping 300 mm (12-inch) diameter and smaller shall
be insulated.
(c) Chilled water return piping 350 mm (14-inch) diameter and larger shall
not be insulated.
(d) Piping under buildings and roads shall be steel.
2.12.12.2 SPECIAL REQUIREMENTS FOR HIGH HUMIDITY AREAS: Insulation for
chilled water piping and cold vessels shall be cellular glass type. See VA
Master Specification, Section 15250.
2.12.13 DOCUMENTATION REQUIREMENTS
2.12.13.1 SCHEMATIC DIAGRAM: A schematic control diagram of the entire
chilled water system shall be shown on one drawing so that there is a
comprehensive understanding of the system configuration and the intended mode
of operation. Partial and incomplete diagrams shall be unacceptable. The
diagram shall be complete with, but not limited to, the following:
(a) Temperature sensors
(b) Control valves
(c) Pressure Differential Assemblies
(d) Expansion tanks
(e) Air separators
(f) All valves and piping specialties not shown on standard details
(g) Water Filters
(h) Chemical Feeders
(i) Water treatment for cooling towers
(j) Measures taken to prevent dead heading of pumps
(k) Water make-up connections
(l) Drain Connections
(m) Variable speed drives, if required
(n) Flow control and measuring devices
2.12.13.2 EQUIPMENT ROOMS
(a) Space Planning: Ample space shall be provided to service and repair the
refrigeration equipment. The tube pull space shall be clearly shown on the
drawings. Overhead hoist beams shall be provided, as required, to facilitate
the removal of the condenser and evaporator heads. Piping shall have the
HVAC DESIGN MANUAL
2-47
HVAC SYSTEMS AND EQUIPMENT
Previous Page
