1107.2.1 Piping in public corridors.
MC § 1107.2.1
Refrigerant piping shall not be installed in public corridors. Exception: Refrigerant piping in public corridors that complies with either of the following conditions: 1. Piping containing Group A1 refrigerant may be located in public corridors provided that the complete discharge of any one refrigerant system into the public corridor will not result in a refrigerant density equal to or greater than 50 percent of the allowable density set forth in Table 1103.1; and 1.1. There is not more than one refrigerant system's piping per tenant; and 1.2. Refrigerant piping and fittings are concealed or otherwise protected from mechanical damage; and either 1.3. Refrigerant piping and fittings are installed with brazed joints; or 1.4. The refrigerant equipment manufacturer provided pre-charged tubing systems installed in accordance with the refrigerant equipment manufacturer's instructions; 2. Piping containing Group A1 refrigerant may be located in public corridors provided that the complete discharge of any one refrigerant system into the public corridor will not result in a refrigerant density of 100 percent of the allowable refrigerant density set forth in Table 1103.1; and 2.1. Such system is provided with fast-acting shutoff valves on both high and low pressure refrigerant line sets, actuated by either local refrigerant monitors in the corridor, or on sensing a drop in pressure on either high or low pressure refrigerant line sets; and 2.2. Upon accidental discharge, actuation of installed refrigerant shutoff valves shall initiate locally installed alarm; and 2.3. Installation of fast-acting shutoff valves, refrigerant detectors, and alarms shall be in accordance with Appendix C; and 2.4. There is not more than one refrigerant system's piping per tenant; and 2.5. Refrigerant piping and fittings are concealed or otherwise protected from mechanical damage; and either 2.6. Refrigerant piping and fittings are installed with brazed joints; or 2.7. The refrigerant equipment manufacturer provided pre-charged tubing systems installed in accordance with the refrigerant equipment manufacturer's instructions.
