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# 1323.1.5 Sizing Procedures

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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:
1. 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.
2. 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.
3. 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.
4. Select Table 1323.1.4(1) through Table 1324.1.4(6) based on the medical gas or vacuum being transported through the piping.
5. 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.
6. 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).
TABLE 1323.1.5(1)
SYSTEM SIZING — FLOW REQUIREMENTS FOR STATION OUTLETS AND INLETS1
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.
TABLE 1323.1.5(2)
MAXIMUM PERMITTED PRESSURE LOSS IN
MEDICAL GAS AND MEDICAL VACUUM SYSTEMS
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
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