Rev. 13 November 1, 2016
Page | 67d. For interior steam and condensate piping with pressures below 75 ps ig, and 2 inch diameter or less, i nstall
Schedule 40 ASTM A106 GrB seamless black steel with standard butt welded fittings.- Condensate Pumps
a. Only duplex condens ate pumps shall be installed.
b. Any condensate receiver which is not recessed nor on elevated legs shall be installed on a conc rete
housekeeping pad.
c. Design ba sis s ha ll be e lectri c condensate pumps. Review with the Owner t he i mportance of installing steam-
powered condensate return pumps wherever such a re proposed for new construction. - Pressure Reducing Valve (PRV) Assemblies
a. Pressure Reducing Valves (PRVs) at service entrances sha ll be eccentric plug control valves by C ashco
Ranger. These valves shall have either steel or ductile i ron bodies. Coordinate with the University FSG for
the specification and purchase of these valves. FSG maintains, and where necessary, r ebuilds the PRVs at
service entrances.
b. Any PRVs downs tream of the service entrance PRVs are owned and maintained by
UIHC.
c. All P RV a ssemblies shall be provided with:
i. A three-valved bypass assembly.
ii. Dial type pressure gauges on both the upstream and downstream sides. - Valves
a. All gate valves shall be 300 # class.
b. For steam a nd steam c ondensate valves a bove 2 inch diameter, all gate v alves s hall be butt welded. Flanged
valves are not a ccept able.
c. For steam and steam condensate valves 2” diameter and less, all gate valves shall be screwed b ronze. - Other
a. Drain valves shall be installed at the bottom of all risers and at all steam main isolation valves.
b. Air b leed valves sha ll be installed at high points of steam c ondensate lines.
23 23 00 Refrigerant Piping Systems- System Design
a. The Design Professional shall provide in the construction documents a detailed piping layout of all field-built
refrigerant piping systems. These layouts shall include all required pipe sizes, traps, double risers, and
refrigerant accessories. - Insulation And Jacketing
a. A weather-resistant covering or field-applied paint shall be applied on all exterior pipe insulation.
b. Vapor barriers shall be applied to all return line insulation.
23 25 00 HVAC Water Treatment Systems- All chi lled water is che mically treated by the University of Iowa chilled water system.
Review the proposed chemical treatment prog ram with the Owner to de termine compatibility with the
on-going chemical treatments. - For all other hy dr onic mechanical piping systems, pr essure test, che mically treat, flush and drain all new
systems.