Rev. 13 November 1, 2016
Page | 65- Other
a. Install manual air vents at accessible locations
i. At the top of all risers.
ii. At all high points in the piping system.
iii. But not in patient rooms.
23 21 14 Hydronic Specialties
Mechanical Piping Specialties^- Balancing valves shall be provided with multiple stops. Ball valves are not acceptable for balancing.
- For strainers above 2” diameter, provide with ball valve flush assembly. All strainers shall be cleaned at the end of
any construction phase. The Contractor shall submit an end-of-construction report certifying that all strainers have
been cleaned. - All relief valves shall be piped to a floor drain. Route all relief piping through areas such that no blockages of
traffic paths are created. - Griswold space-saver type control valves shall not be used. The following shall be the standard: Hammond ball
valves and strainers, and Bell & Gossett circuit balancing valves.
Glycol Piping S ystems- Materials
a. For interior glycol piping above 2 inch diameter, install either:
i. Schedule 40 ASTM A53 seamless black steel with welded joints. Where threaded joints must be used
due to equipment connections, install with Teflon tape. The Design Professional shall specify all
Teflon tape, gaskets, and other sealants that are totally compatible with the glycol and inhibitor to be
used in the system.
ii. Type L ASTM B88 copper with wrought fittings. Screwed fittings shall not be used.
b. For interior glycol piping 2 inch diameter or less, install either:
i. Schedule 40 ASTM A53 seamless black steel with welded joints.
ii. Type L ASTM B88 copper with wrought fittings. - Other
a. Install manual air vents at accessible locations
i. At the top of all risers.
ii. At all high points in the piping system.
iii. But not in patient rooms.
b. Install low pressure alarms on glycol piping systems to sense any leakage from the system. The low pressure
alarm signal shall be monitored by the building automation system. Do not install automatic make-up water
connections to glycol piping grids due to the danger of dilution of the glycol/water mixture (and hence
potential freezing).