// CODE SNIPPET
1323.1.5 Sizing Procedures
Go To Full Code Chapter
The size of each section of pipe in a system within the range of Table 1323.1.4(1) through Table 1324.1.4(6) shall be determined in accordance with the following:
- Determine the total flow rate and number of outlets or inlets for each section of pipe in accordance with Table 1305.2 and Table 1305.3.
- Measure the length of the section of pipe to each station outlet or inlet on the system. Multiply the measured pipe length by 1.5 (150 percent), to account for the number of fittings in the system, to determine the pipe equivalent length.
- Beginning with the most remote outlet or inlet, multiply the total flow rate by the diversity factor specified in Table 1323.1.5(1) for each section of pipe to determine the sizing flow rate for the piping.
- Select Table 1323.1.4(1) through Table 1324.1.4(6) based on the medical gas or vacuum being transported through the piping.
- Select an estimated pipe size for determining the system pressure loss. Multiply the pipe equivalent length, for a given section of pipe, by the pressure loss for the sizing flow rate in the applicable table. Divide that number by 100 to determine the system pressure loss for the section of pipe.
- Add the pressure loss for each section of piping, from the source equipment location to the outlet or inlet, to determine the total system pressure loss to each outlet or inlet. The total system pressure loss in the piping to each outlet or inlet shall not exceed the values specified in Table 1323.1.5(2).
| NUMBER OF OUTLETS AND INLETS TERMINAL UNITS PER FACILITY | DIVERSITY PERCENTAGE OF AVERAGE FLOW PER OUTLETS AND INLETS TERMINAL UNITS | MINIMUM PERMISSIBLE SYSTEM FLOW OF ALL PRESSURIZED MEDICAL GAS SYSTEMS2 (standard cubic feet per minute) |
|---|---|---|
| 1—10 | 100% | Actual Demand |
| 11—25 | 75% | 7.0 |
| 26—50 | 50% | 13.1 |
| 51—100 | 50% | 17.5 |
Notes:
1 Flow rates of station outlets and inlets in accordance with Table 1305.2.
2 The minimum system flow is the average outlets and inlets flow times the number of station outlets and inlets times the diversity percentage.
| TYPE OF SYSTEM | MAXIMUM ALLOWABLE SYSTEM PRESSURE LOSS (psi) |
|---|---|
| Medical Air | 5 |
| Nitrogen | 15 |
| Nitrous Oxide | 5 |
| Carbon Dioxide | 5 |
| Oxygen | 5 |
| Medical Vacuum | 4 inches of mercury |
For SI units: 1 pound-force per square inch = 6.8947 kPa, 1 inch of mercury = 3.386 kPa
Upcodes Diagrams
Related Code Sections
1323.1.5 Health Care Facilities and Medical Gas and Medical Vacuum Systems, Sizing Procedures
The size of each section of pipe in a system within the range of Table 1323.1.4(1) through Table 1324.1.4(6) shall be determined in accordance ...
A 106.3 Recommended Rules for Sizing the Water Supply System, Water Closets
The size of branches and mains serving flushometer tanks shall be consistent with sizing procedures for flush tank water closets ...
610.11 Water Supply and Distribution, Sizing Systems for Flushometer Tanks
The size of branches and mains serving flushometer tanks shall be consistent with the sizing procedures for flush tank water closets ...
A 101.0 Recommended Rules for Sizing the Water Supply System, General
This appendix provides a general procedure for sizing a water supply system. Because of the variable conditions encountered, it is impractical to lay ...
E3701.1 Branch Circuit and Feeder Requirements, Scope
of the dwelling unit load shall be sized in accordance with the procedures in Chapter 36. [310.15(B)(7)(2)] ...