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Calcimator

Medical Gas Pipe Sizing Calculator

Size medical gas piping per NFPA 99 for oxygen, vacuum, medical air, and nitrous oxide systems.

Inputs

Results

Branch Pipe Size

1 in

Main Pipe Size

1.25 in

Est. Pressure Drop0.34 PSI
Total Design Flow96 LPM
How to Use This Calculator
  1. Enter Number of Outlets, Gas Type, and Oxygen.
  2. Set Vacuum (Suction), Medical Air, and Nitrous Oxide.
  3. Adjust Flow Rate per Outlet (LPM) as needed.
  4. Review Branch Pipe Size (in) and Main Pipe Size.
  5. Use Est. Pressure Drop (PSI) and Total Design Flow (LPM) to inform your decision.

How the result changes with Number of Outlets

Number of OutletsBranch Pipe SizeMain Pipe Size
211 in1.25 in
711.25 in1.5 in
1301.5 in2 in
1802 in2.5 in

What each input means

Number of Outlets
Total number of gas outlets on the system zone or branch
Gas Type
Type of medical gas — each has different flow requirements per NFPA 99
Flow Rate per Outlet (LPM)
Design flow rate per outlet in liters per minute

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Number of Outlets = 12, Gas Type = 1, Flow Rate per Outlet (LPM) = 10 = 3 input(s) provided
  2. Calculate Branch Pipe Size
    1 = 1
  3. Calculate Main Pipe Size
    Main Pipe Size
    1.25 = 1.25
  4. Calculate Est. Pressure Drop
    Est. Pressure Drop
    0.34 = 0.34
  5. Calculate Total Design Flow
    Total Design Flow
    96 = 96

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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