(a) In General. Hydronic piping requirements are stipulated herein and shall apply to all hot water heating, low-pressure steam, chilled water and chilled glycol systems. The piping for these systems shall be installed in a manner to provide for the fluid distribution between the generating equipment components and terminal devices. Except as modified below, hydronic piping systems shall comply with applicable provisions of the Ohio Basic Building Code (Mechanical) (refer to Appendix A), Article 7 [OAC 4101:2-38], “Hydronic Piping”, and the ASHRAE Handbook of Fundamentals, 1989, Chapter 3, “Pipe Sizing” (refer to Appendix A).
(b) Materials; Installations.
(1) Systems circulating a heated fluid shall be copper Type "L" or "K" pipe, Schedule 40 steel pipe, brass pipe, or polyvinylchloride (PVC) or acrylonitrile butadiene styrene (ABS) plastic pipe, with compatible fittings and accessories.
(2) Piping shall be installed in a manner so as to provide for thermal expansion and contraction of the piping without damage to piping, equipment or structure.
(3) Provisions shall be included for fluid expansion, air removal and draining of the system. ASME (refer to Appendix A) rated relief and pressure reducing valves shall be incorporated into the system as required for safety and proper operation.
(4) Hydronic equipment and terminal devices shall be provided with valves and other accessories required to isolate components, balance the system, vent and control fluid flow.
(5) Piping shall be tested, made leak free and inspected by the Building Inspector prior to furring, concealment, insulation or placing the system in operation.
(c) Panel Heating Systems; Materials; Installations. Panel heating systems with water or glycol as a fluid and a maximum fluid temperature of 120 degrees Fahrenheit shall use only Type "L" or "K" copper, Schedule 40 steel or Schedule 40 polyvinylchloride (PVC) or acrylonitrile butadiene styrene (ABS) plastic piping. These provisions are applicable to circulating fluid snow melting systems.
(1) The joints in the imbedded or concealed piping shall be at a minimum.
(2) When installed in the floor, the floor or concrete slab shall be insulated below the piping (R-6 minimum) and there shall be at least three-fourths of an inch of concrete fully encasing the pipes.
(3) At slab penetrations, plastic inserts with sufficient flexibility shall be installed to protect the pipe and to prevent corrosion and piping rupture.
(4) A maximum of 105 degrees Fahrenheit fluid temperature may be circulated in a floor or concrete slab.
(Ord. 1992-101. Passed 1-14-92.)