Calculate how long your oxygen supply will last based on tank size and flow rate.
D Cylinder (0.16)
E Cylinder (0.28)
M Cylinder (1.56)
G Cylinder (2.41)
H/K Cylinder (3.14)
Remaining Supply:
How to Calculate Oxygen Cylinder Flow Rate
In medical and emergency settings, knowing exactly how much time remains in an oxygen cylinder is critical for patient safety. The duration of flow depends on the tank's pressure, the size of the tank (represented by a conversion factor), and the rate at which the oxygen is being delivered (LPM).
The Oxygen Duration Formula
The standard formula used by healthcare professionals and respiratory therapists is:
Imagine you have an E-Cylinder with a current pressure reading of 1,500 PSI. The patient is prescribed 2 Liters Per Minute (LPM) of oxygen. You want to keep a safety buffer of 200 PSI.
Convert to Time: 182 minutes is 3 hours and 2 minutes.
Safety Precautions
Always ensure that "Safe Residual Pressure" is accounted for. Most medical protocols recommend switching to a new tank when the gauge hits 200 PSI to ensure the patient never experiences a sudden loss of flow and to prevent moisture from entering the cylinder.
function calculateOxygenDuration() {
var factor = parseFloat(document.getElementById("tankSize").value);
var psi = parseFloat(document.getElementById("gaugePressure").value);
var residual = parseFloat(document.getElementById("safeResidual").value);
var flow = parseFloat(document.getElementById("flowRate").value);
var resultDiv = document.getElementById("oxygenResult");
var output = document.getElementById("resultOutput");
var minutesText = document.getElementById("totalMinutes");
if (isNaN(psi) || isNaN(residual) || isNaN(flow) || flow <= 0) {
alert("Please enter valid numbers. Flow rate must be greater than zero.");
return;
}
if (psi 0) {
timeString += hours + (hours === 1 ? " Hour " : " Hours ");
}
timeString += remainingMinutes + (remainingMinutes === 1 ? " Minute" : " Minutes");
output.innerHTML = timeString;
minutesText.innerHTML = "Total estimated time: " + Math.round(totalMinutes) + " minutes.";
resultDiv.style.display = "block";
}