Rev. 13 November 1, 2016
Page | 63c. Install horizontal sections of mechanical piping mains above-ceiling in corridors unless authorized
otherwise by the Owner.
d. All above-ceiling sections of branch lines shall be at least ¾” diameter to allow for future capacity additions.
Terminal runs in walls and to fixtures may be less than ¾” diameter.
e. Provide isolation valves on all branch lines and on all equipment. The Design
Professional shall specify, and then field verify, that all new valves are accessible.
f. Pipes shall not be routed over electrical equipment rooms and Telecom closets unless authorized otherwise by
the Owner.
g. Where mechanical piping risers span more than two floors, those risers shall be installed inside of fire-rated
chases.
h. Do not install mechanical piping:
i. Within 18” inches horizontally of any pneumatic transport tube diverter.
ii. Below any pneumatic transport tube diverter.
iii. Within 18” horizontally of any terminal air box.
iv. In the door swing space of any duct access door.
v. Within 12” of the front of any electrical junction box.
vi. Within 12" of any roof perimeter or penetration requiring roof flashing.
vii. Within 4" of the new roof surface elevation.
i. Install diel ectric connections in the mechanical piping systems whe re any dissimilar metals are in contact.
j. All valves shall be tagged unless valves are ¾” in diameter and adjacent to equipment served. Valve tags
shall include the valve number and project number. Coordinate the specific numbering sequence with the
Owner’s Rep. during the cons truction phase of each project.
k. All types of mechanical piping risers, except cooling coil condensate and refrigerant piping, shall have drain
valves at their bottom as well as isol ation valves on their horizontal supply and return branches where they
connect to their ri sers.
l. Pressure Testing
i. Pressure testing is required on all piping systems.
ii. All pressure tests shall be witnessed and/or signed off by the Owner.
iii. The Contractor shall provide seven days advance notice of all pressure testing.
iv. The Contractor shall provide new valves as required to perform pressure testing of segments of new
piping.23 21 00 Hydronic Piping and Pumps
Chilled Water P iping Systems- UIHC Chilled water design criteria
a. Cooling coil selection shall be based upon 14 degrees temperature difference between the entering chilled
water and the leaving chilled water, unless authorized otherwise by the Owner. (High humidity removal
conditions could dictate a lower delta T be used as the design basis.)
b. The cooling coil control valve shall be an industrial quality, pressure independent valve with 100 to 1
rangeability and an electronic actuator.
c. Cooling coil control valves shall be Delta P valves by Flow Control Industries, unless otherwise authorized by
the Owner’s Rep.
d. Information system points
i. Service entrances (from the U of I campus chilled water system) shall include points for supply
temperature, return temperature, supply pressure, and return temperature.